PhysicsFinal

Question 1 of 200

1

A baseball of mass m is thrown upward with some initial speed. A gravitational force is exerted on the ball

Select one of the following:

At all points in its motion
At all points in its motion except at the highest point
At no points in its motion
Only at downward part of its direction

Explanation

Question 2 of 200

1

The kinetic friction will always be

Select one of the following:

Less than static friction
Greater than static friction
Equal to the static friction
Negative

Explanation

Question 3 of 200

1

The unit of coefficient of friction in SI system is

Select one of the following:

Newton
Dyne
None of these
No unit

Explanation

Question 4 of 200

1

Whenever a constant force is applied on a body then it will move with __________.

Select one of the following:

Constant Speed
Constant Velocity
Constant Acceleration
None of them

Explanation

Question 5 of 200

1

Power is a __________.

Select one of the following:

Scalar Quantity
Vector Quantity
None of these
Rate of force

Explanation

Question 6 of 200

1

The dot product of force and velocity is called __________.

Select one of the following:

Work
Power
Energy
Momentum

Explanation

Question 7 of 200

1

When the force and displacement are perpendicular to each other, then work is __________.

Select one of the following:

zero
Maximum
None of these
Depends on force magnitude

Explanation

Question 8 of 200

1

Centripetal acceleration and tangential acceleration are always __________

Select one of the following:

Parallel to Each other, but in opposite direction
Perpendicular to each other
None of these
Parallel to Each other, but in the same direction

Explanation

Question 9 of 200

1

The dimensions of angular momentum are __________.

Select one of the following:

MLT-1
MLT-2
ML2T-2
ML2T-1

Explanation

Question 10 of 200

1

The moment of inertia of a wheel about its axle does not depend upon its:

Select one of the following:

Diameter
Mass
distribution of mass
speed of rotation

Explanation

Question 11 of 200

1

Two waves have the same frequency. Which wave characteristic must also be identical for both waves?

Select one or more of the following:

Phase
Amplitude
Intensity
Period

Explanation

Question 12 of 200

1

A mechanical wave generally does NOT

Select one or more of the following:

move the medium from one place to another
move through a medium
move through solids
disturb the medium

Explanation

Question 13 of 200

1

The moment of inertia of a body depends on

Select one or more of the following:

the angular velocity
the angular acceleration
the mass distribution
the torque acting on the body

Explanation

Question 14 of 200

1

A skater can spin faster by pulling in her arms closer to her body or spin slower by spreading her arms out from her body. This is due to

Select one or more of the following:

Conservation of momentum
Conservation of energy
Newton’s third law
Conservation of angular momentum

Explanation

Question 15 of 200

1

The SI units for Coulomb constant ke are:

Select one or more of the following:

N·m2/C2
N·m/C
N·m/C2
m2/C2
No correct answer

Explanation

Question 16 of 200

1

The electric field vector E can be expressed as:

Select one or more of the following:

E=Fe/q
E=Fe/q2
E=Fe·q
E=Fe·q2
No correct answer

Explanation

Question 17 of 200

1

Which statements are correct?

Select one or more of the following:

Charges of opposite sign attract one another and charges of the same sign repel one another. Total charge in an isolated system is conserved. Charge is quantized.
Charges of opposite sign repel one another and charges of the same sign attract one another. Total charge in an isolated system is conserved. Charge is quantized.
Charges of opposite sign attract one another and charges of the same sign repel one another. Total charge in an isolated system is not conserved. Charge is quantized.
Charges of opposite sign repel one another and charges of the same sign attract one another. Total charge in an isolated system is ot conserved. Charge is not quantized.
No correct answer

Explanation

Question 18 of 200

1

Which statements are correct?

Select one or more of the following:

Conductors are materials in which electrons move freely. Insulators are materials in which electrons do not move freely.
Insulators are materials in which electrons move freely. Conductors are materials in which electrons do not move freely.
Conductors are materials in which electrons don’t move freely. Insulators are materials in which electrons move freely.
All answers are correct
No correct answer

Explanation

Question 19 of 200

1

If the electric field is uniform and makes an angle θ with the normal to a surface of area A, the electric flux through the surface is:

Select one or more of the following:

ΦE=EAcosθ
ΦE=EAsinθ
ΦE=Acosθsinθ
ΦE=Ecosθ
No correct answer

Explanation

Question 20 of 200

1

Gauss’s law says that the net electric flux ΦE through any closed gaussian surface is equal to:

Select one or more of the following:

ΦE=qin/ε0
ΦE=qin·ε0
ΦE= ε0/qin
ΦE=qinqout/ε0
No correct answer

Explanation

Question 21 of 200

1

A conductor in electrostatic equilibrium has the following properties:

Select one or more of the following:

1. The electric field is zero everywhere inside the conductor. 2. Any net charge on the conductor resides entirely on its surface. 3. The electric field just outside the conductor is perpendicular to its surface and has a magnitude σ/ε0, where σ is the surface charge density at that point. 4. On an irregularly shaped conductor, the surface charge density is greatest where the radius of curvature of the surface is the smallest.
1. The electric field is zero everywhere inside the conductor. 2. Any net charge on the conductor resides partially on its surface, partially inside the conductor. 3. The electric field just outside the conductor is parallel to its surface and has a magnitude σ/ε0, where σ is the surface charge density at that point. 4. On an irregularly shaped conductor, the surface charge density is greatest where the radius of curvature of the surface is the smallest.
1. The electric field is non zero everywhere inside the conductor. 2. Any net charge on the conductor resides entirely on its surface. 3. The electric field just outside the conductor is perpendicular to its surface and has a magnitude σ/ε0, where σ is the surface charge density at that point. 4. On an irregularly shaped conductor, the surface charge density is greatest where the radius of curvature of the surface is the biggest.
1. The electric field is zero everywhere inside the conductor. 2. Any net charge on the conductor resides entirely inside the conductor. 3. The electric field just outside the conductor is perpendicular to its surface and has a magnitude σ/ε0, where σ is the surface charge density at that point. 4. On an irregularly shaped conductor, the surface charge density is smallest where the radius of curvature of the surface is the smallest.
No correct answer

Explanation

Question 22 of 200

1

The potential difference between two points A and B in a uniform electric field E, where s (d=|s|) is a vector that points from A to B and is parallel to E is:

Select one or more of the following:

∆V=-Ed
∆V=0
∆V=Ed
∆V=-Edsinθ
No correct answer

Explanation

Question 23 of 200

1

Which statements are correct?

Select one or more of the following:

An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are perpendicular to electric field lines.
An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are parallel to electric field lines.
An equipotential surface is one on which all points are not at the same electric potential. Equipotential surfaces are perpendicular to electric field lines.
An equipotential surface is one on which all points are at the same electric potential. Equipotential surfaces are perpendicular to gravitation field lines.
No correct answer

Explanation

Question 24 of 200

1

The SI unit of capacitance is:

Select one or more of the following:

C/V
V/C
C/V2
C/V·m
No correct answer

Explanation

Question 25 of 200

1

The equivalent capacitance of a parallel combination of capacitors is:

Select one or more of the following:

Ceq=C1+C2+C3+...
1/Ceq=1/C1+1/C2+1/C3+...
Ceq=C1=C2=C3=...
Ceq=C1·C2·C3·...
No correct answer

Explanation

Question 26 of 200

1

If two or more capacitors are connected in series, the equivalent capacitance of the series combination is given by:

Select one or more of the following:

Ceq=C1+C2+C3+...
1/Ceq=1/C1+1/C2+1/C3+...
Ceq=C1=C2=C3=...
Ceq=C1·C2·C3·...
No correct answer

Explanation

Question 27 of 200

1

The electric dipole moment p of an electric dipole has a magnitude:

Select one or more of the following:

p=2aQ
p=Q
p=Q2
p=-2aQ
No correct answer

Explanation

Question 28 of 200

1

The torque acting on an electric dipole in a uniform electric field E is:

Select one or more of the following:

τ=pxE
τ=p·E
τ=p/E
τ=qpxE
No correct answer

Explanation

Question 29 of 200

1

The potential energy of the system of an electric dipole in a uniform external electric field E is:

Select one or more of the following:

U=- p·E
U= pxE
U= p·E
No correct answer
U= p/E

Explanation

Question 30 of 200

1

The average current in a conductor is related to the motion of the charge carriers through the relationship:

Select one or more of the following:

Iav=nqvdA
Iav=nqvd
Iav=qvdA
Iav=nq/vdA
No correct answer

Explanation

Question 31 of 200

1

The magnitude of the current density J in a conductor is:

Select one or more of the following:

J=I/A
J=IA
J=IA2
J=I2/A
No correct answer

Explanation

Question 32 of 200

1

Ohm’s law in the differential form is:

Select one or more of the following:

J=σE
I=U/R
I=R/U
J=σ/E
No correct answer

Explanation

Question 33 of 200

1

Ohm’s law in the integral form is:

Select one or more of the following:

J=σE
I=U/R
I=R/U
J=σ/E
No correct answer

Explanation

Question 34 of 200

1

The resistance R of a conductor is defined as:

Select one or more of the following:

R=∆V/I
R=σE
R=∆V·I
R=I/∆V
No correct answer

Explanation

Question 35 of 200

1

The power supplied to the element, is:

Select one or more of the following:

P=I∆V
P=I/∆V
P=I2∆V
P=I∆V2
No correct answer

Explanation

Question 36 of 200

1

The power delivered to a resistor can be defined as:

Select one or more of the following:

P=I2R
P=IR
P=IR2
P=I2/R
No correct answer

Explanation

Question 37 of 200

1

The equivalent resistance of a set of resistors connected in series is:

Select one or more of the following:

Req=R1+R2+R3+...
1/Req=1/R1+1/R2+1/R3+...
Req=1/(R1+R2+R3+...)
Req=R1+R2+R3+...R4
No correct answer

Explanation

Question 38 of 200

1

Circuits involving more than one loop are conveniently analyzed with the use of Kirchhoff’s rules:

Select one or more of the following:

1. The sum of the currents entering any junction in an electric circuit must equal the sum of the currents leaving that junction. 2. The sum of the potential differences across all elements around any circuit loop must be zero.
1. The product of the currents entering any junction in an electric circuit must equal the sum of the currents leaving that junction. 2. The sum of the potential differences across all elements around any circuit loop must be constant.
1. The sum of the currents at any circuit loop must be zero. 2. The sum of the potential differences across all elements around any circuit loop must be zero.
1. The sum of the currents entering any junction in an electric circuit must equal the sum of the currents leaving that junction. 2. The product of the potential differences across all elements around any circuit loop must be zero.
No correct answer

Explanation

Question 39 of 200

1

Two objects, with different sizes, masses, and temperatures, are placed in thermal contact. Energy travels

Select one or more of the following:

From the larger object to the smaller object,
From the object with more mass to the one with less,
From the object at higher temperature to the object at lower temperature,
Energy doesn’t travel,
From the object at lower temperature to the object at higher temperature,

Explanation

Question 40 of 200

1

On a day when the temperature reaches 50°F, what is the temperature in degrees Celsius and in kelvins?

Select one or more of the following:

50 C, 323 K,
40 C, 313 K,
30 C, 303 K,
20 C, 293 K,
10 C, 283 K.

Explanation

Question 41 of 200

1

A helium-filled rubber balloon is left in a car on a cold winter night. Compared to its size when it was in the warm car the afternoon before, the size the next morning is

Select one or more of the following:

Larger
Smaller
Unchanged

Explanation

Question 42 of 200

1

The first law of thermodynamics can be given as ________.

Select one or more of the following:

for any spontaneous process, the entropy of the universe increases
the entropy of a pure crystalline substance at absolute zero is zero
ΔS = Q/T at constant temperature
ΔE = Q + W

Explanation

Question 43 of 200

1

The second law of thermodynamics can be given as __________

Select one or more of the following:

for any spontaneous process, the entropy of the universe increases
the entropy of a pure crystalline substance at absolute zero is zero
ΔS = Q/T at constant temperature
ΔE = Q + W

Explanation

Question 44 of 200

1

Which of the following is not a state function?

Select one or more of the following:

Pressure
Volume
Temperature
Mole

Explanation

Question 45 of 200

1

Two containers hold an ideal gas at the same temperature and pressure. Both containers hold the same type of gas but container B has twice the volume of container A. The average translational kinetic energy per molecule in container B is

Select one or more of the following:

twice that for container A
the same as that for container A
half that for container A
impossible to determine.

Explanation

Question 46 of 200

1

Two containers hold an ideal gas at the same temperature and pressure. Both containers hold the same type of gas but container B has twice the volume of container A. The internal energy of the gas in container B is

Select one or more of the following:

twice that for container A
the same as that for container A
half that for container A
impossible to determine

Explanation

Question 47 of 200

1

Two containers hold an ideal gas at the same temperature and pressure. Both containers hold the same type of gas but container B has twice the volume of container A. The rms speed of the gas molecules in container B is

Select one or more of the following:

twice that for container A
the same as that for container A
half that for container A
impossible to determine

Explanation

Question 48 of 200

1

How does the internal energy of an ideal gas change as it follows path i->f in figure?

Select one or more of the following:

Eint increases
Eint decreases
Eint stays the same
There is not enough information to determine how Eint changes

Explanation

Question 49 of 200

1

How does the internal energy of an ideal gas as it follows path f->f1 along the isotherm labeled T + deltaT in figure ?

Select one or more of the following:

increases
decreases
stays the same
There is not enough information to determine how changes

Explanation

Question 50 of 200

1

Latent heat is

Select one or more of the following:

the heat released or absorbed by a thermodynamic system during a process that occurs without a change in temperature
the amount of energy needed to raise the temperature of sample by 1°C
the heat capacity per unit mass
the amount of heat required to change a unit mass of a substance by one degree in temperature
amount of energy necessary to raise the temperature of 1 g of water from 14.5°C to 15.5°C.

Explanation

Question 51 of 200

1

Adiabatic process is

Select one or more of the following:

process that occurs at constant volume
process that occurs at constant temperature
process that occurs at constant pressure
process in which the net heat transfer between the system and its surroundings is zero
process that obeys the relation: pVn=C

Explanation

Question 52 of 200

1

A diatomic gas molecule has ... degrees of freedom

Select one or more of the following:

3
5
6
7
more

Explanation

Question 53 of 200

1

Energy may be transferred by

Select one or more of the following:

work
conduction
convection
radiation
all answers are correct

Explanation

Question 54 of 200

1

The molar specific heat of a gas is measured at constant volume and found to be 11R/2. The gas is most likely to be

Select one or more of the following:

monatomic
diatomic
monatomic or diatomic, depends on the conditions
polyatomic
all answers are incorrect

Explanation

Question 55 of 200

1

Parallel wires carrying currents I1 and I2 respectively

Select one or more of the following:

repel if they are directed opposite
will attract if they are directed opposite
will not interact

Explanation

Question 56 of 200

1

What are the opposite ends of a magnet called?

Select one or more of the following:

Its terminals
Its north and south poles
Its magnetic fields
Its electromagnetic poles

Explanation

Question 57 of 200

1

How are electrical charges and magnetic poles similar?

Select one of the following:

Unlike attract and the same type repel
Both are plus and minus
Magnetic poles attract electrons
Both change positive to negative charges

Explanation

Question 58 of 200

1

How can you show that electricity creates a magnetic field?

Select one or more of the following:

Use a compass near a wire with current flowing through it
Only magnets create magnetic fields
Move a wire through a magnetic field
Connect a battery to the magnetic field

Explanation

Question 59 of 200

1

How can you make an electromagnet?

Select one or more of the following:

Attach a natural magnet to a battery
Run current through a wire wrapped around an iron rod
Line up the N and S poles of a magnet with an electric wire
Wrap a magnet around a piece of wire with current flowing through it

Explanation

Question 60 of 200

1

What happens when you turn off the current in an electromagnet?

Select one or more of the following:

The magnetism is turned off
The current keeps flowing because of the magnetic force
The electromagnet reverses its polarity
The electromagnet becomes a generator

Explanation

Question 61 of 200

1

How can you create electricity with a magnet?

Select one or more of the following:

Attach a magnet to a battery
By putting a current through a wire around a magnet
By moving a wire through a magnetic field
You can't, because only friction on electric charges creates electricity

Explanation

Question 62 of 200

1

Can you create electricity with a magnet?

Select one or more of the following:

No, because only friction on electric charges or batteries create electricity
Yes, by moving a wire through a magnetic field
Yes, by putting a current through a wire around a magnet
Yes because magnets use electricity to stay effective

Explanation

Question 63 of 200

1

The geomagnetic field

Select one or more of the following:

makes the Earth like a huge horseshoe magnet
runs exactly through the geographic poles
makes a compass work
makes an electromagnet work

Explanation

Question 64 of 200

1

A material that can be permanently magnetized is generally said to be

Select one or more of the following:

magnetic
electromagnetic
permanently magnetic
ferromagnetic

Explanation

Question 65 of 200

1

The magnetic flux around a straight current-carrying wire

Select one or more of the following:

gets stronger with increasing distance from the wire
is strongest near the wire
does not vary in strength with distance from the wire
consists of straight lines parallel to the wire

Explanation

Question 66 of 200

1

The gauss is a unit of

Select one or more of the following:

overall magnetic field strength
ampere-turns
magnetic flux density
magnetic power

Explanation

Question 67 of 200

1

If a wire coil has 10 turns and carries 500 mA of current, what is the magnetomotive force in ampere-turns?

Select one or more of the following:

5,000
50
5.0
0.02

Explanation

Question 68 of 200

1

Which of the following is not generally observed in a geomagnetic storm?

Select one or more of the following:

Charged particles streaming out from the Sun
Fluctuations in the Earth’s magnetic field
Disruption of electrical power transmission
Disruption of microwave propagation

Explanation

Question 69 of 200

1

A device that reverses magnetic field polarity to keep a dc motor rotating is

Select one or more of the following:

a solenoid
an armature coil
a commutator
a field coil

Explanation

Question 70 of 200

1

When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage

Select one or more of the following:

increases
decreases
remains constant
reaches zero

Explanation

Question 71 of 200

1

The induced voltage across a coil with 250 turns that is located in a magnetic field that is changing at a rate of 8 Wb/s is

Select one or more of the following:

1,000 V
2,000 V
31.25 V
3.125 V

Explanation

Question 72 of 200

1

For a given wirewound core, an increase in current through the coil

Select one or more of the following:

reverses the flux lines
decreases the flux density
increases the flux density
causes no change in flux density

Explanation

Question 73 of 200

1

If the cross-sectional area of a magnetic field increases, but the flux remains the same, the flux density

Select one or more of the following:

Increases
decreases
remains the same
doubles

Explanation

Question 74 of 200

1

When the current through the coil of an electromagnet reverses,

Select one or more of the following:

direction of the magnetic field reverses
direction of the magnetic field remains unchanged
magnetic field expands
magnetic field collapses

Explanation

Question 75 of 200

1

What is the reluctance of a material that has a length of 0.07 m, a cross-sectional area of 0.014 m2, and a permeability of 4,500 Wb/At × m?

Select one or more of the following:

1111 At/Wb
111 At/Wb
11 At/Wb
1 At/Wb

Explanation

Question 76 of 200

1

A coil of wire is placed in a changing magnetic field. If the number of turns in the coil is decreased, the voltage induced across the coil will

Select one or more of the following:

increase
decrease
remain constant
be excessive

Explanation

Question 77 of 200

1

What is the flux density when the flux is 5.5 Wb and the cross-sectional area is 6 × 10–3 m2?

Select one or more of the following:

91.7 µT
917 µT
91 T
9.7 T

Explanation

Question 78 of 200

1

If the steel disk in a crankshaft position sensor has stopped with the tab in the magnet's air gap, the induced voltage

Select one or more of the following:

increases
decreases
is zero
will remain constant

Explanation

Question 79 of 200

1

What is the flux density in a magnetic field in which the flux in 0.1 m2 is 600 Wb?

Select one or more of the following:

6,000 µT
600 µT
600 T
6 T

Explanation

Question 80 of 200

1

A parallel-plate capacitor with air between the plates has an area A=2.00·104 m2 and a plate separation d=1.00 mm. Find its capacitance.

Select one or more of the following:

C=1.77 pF
C=1.77 F
C=1.77 mF
C=1.77 nF
No correct answer

Explanation

Question 81 of 200

1

Find the equivalent capacitance between a and b for the combination of capacitors shown in Figure. All capacitances are in microfarads.

Select one or more of the following:

6.0 μF
6.0 F
5.0 μF
6.0 nF
No correct answer

Explanation

Question 82 of 200

1

A parallel-plate capacitor has plates of dimensions 2.0 cm by 3.0 cm separated by a 1.0-mm thickness of paper. Find its capacitance (k = 3.7, ε0=8.85·10-12 C2/N·m2).

Select one or more of the following:

20 pF
20 F
40 pF
60 pF

Explanation

Question 83 of 200

1

Find the electric flux Φe though the spherical surface, covers the point-like charges q1=5 nC and q2=-2 nC. (ε0=8.85·10-12 C2/N·m2)

Select one or more of the following:

Φe=339 N·m2/C
Φe=0.339 N·m2/C
Φe=339 N/C
Φe=339 N·m2
No correct answer

Explanation

Question 84 of 200

1

Find the attractive force F between nuclei of hydrogen atom and electron. Radius of hydrogen atom is r=0.5·10-10 m; modules charge of nuclei are equal and opposite to charge sign of electron (ε0=8.85·10-12 C2/N·m2).

Select one or more of the following:

F=92.3·10-9 N
F=92.3 N
F=92.3·10-9 N/m2
F=923·10-9 N
No correct answer

Explanation

Question 85 of 200

1

Two point-like charges in air (ε=1) at the distance r1=20 sm from each other interact with some force. At what distance r2 one needs to place this charges in oil (ε2=5) to get the same force of interaction?

Select one or more of the following:

r2=8.94 sm
r2=8.94 m
r2=8.94·103 m
r2=8.94·10-3 m
No correct answer

Explanation

Question 86 of 200

1

The electron and proton of a hydrogen atom are separated (on the average) by a distance of approximately 5.3·10-11 m. Find the magnitudes of the electric force between the two particles. (ke=8.99·109 N·m2/C2)

Select one or more of the following:

8.2·10-8 N
8.2 N
8.2·10-9 N
8.2·109 N
No correct answer

Explanation

Question 87 of 200

1

Calculate the resistance of an aluminum cylinder that has a length of 10.0 cm and a cross-sectional area of 2.00·10-4 m2 (ρ=2.82·10-8 Ω·m).

Select one or more of the following:

R=1.4·10-5 Ω
R=1.4·10-3 Ω
R=1.4 Ω
R=1.4·105 Ω
No correct answer

Explanation

Question 88 of 200

1

Calculate the resistance of an glass cylinder that has a length of 10.0 cm and a cross-sectional area of 2.00·10-4 m2 (ρ=3·1010 Ω·m).

Select one or more of the following:

R=1.5·10^13 Ω
R=1.5·10^-13 Ω
R=1.5·10^3 Ω
No correct answer

Explanation

Question 89 of 200

1

Calculate the resistance per unit length of a 22-gauge Nichrome wire, which has a radius of 0.321 mm (The resistivity of Nichrome is 1.5·10-6 Ω·m).

Select one or more of the following:

4.6 Ω/m
4.6 Ω
4.6 Ω·m
4.6·10-3 Ω/m
No correct answer

Explanation

Question 90 of 200

1

If a potential difference of 10 V is maintained across a 1.0-m length of the Nichrome wire with resistance 4.6 Ω, what is the current in the wire?

Select one or more of the following:

2.2 A
0.46 A
2.2·10-3 A
0.46·103 A
No correct answer

Explanation

Question 91 of 200

1

An electric heater is constructed by applying a potential difference of 120 V to a Nichrome wire that has a total resistance of 8.00 Ω. Find the current carried by the wire.

Select one or more of the following:

15 A
0.06 A
15·10-3 A
0.06·10-3 A
No correct answer

Explanation

Question 92 of 200

1

An electric heater is constructed by applying a potential difference of 120 V to a Nichrome wire that has a total resistance of 8.00 Ω. Find the power rating of the heater.

Select one or more of the following:

1.8 kW
1.8 W
120 W
0.1 kW
No correct answer

Explanation

Question 93 of 200

1

A battery has an emf of 12.0 V and an internal resistance of 0.05 Ω. Its terminals are connected to a load resistance of 3.00 Ω. Find the terminal voltage of the battery.

Select one or more of the following:

11.8 V
8.07 V
11.95 A
All answers are correct
No correct answer

Explanation

Question 94 of 200

1

Calculate the power delivered to the load resistor, if the current in the circuit is 3.93 A, the load resistance is 3.00 Ω.

Select one or more of the following:

46.3 W
11.79 W
35.37 W
All answers are correct
No correct answer

Explanation

Question 95 of 200

1

Calculate the power delivered to the internal resistance of the battery, if the current in the circuit is 3.93 A, the internal resistance of 0.05 Ω.

Select one or more of the following:

0.772 W
0.1965 W
0.01 W
All answers are correct
No correct answer

Explanation

Question 96 of 200

1

Four resistors are connected as shown in Figure. Find the equivalent resistance between points a and b

Select one or more of the following:

12 Ω
2.7 Ω
5.37 Ω
All answers are correct
No correct answer

Explanation

Question 97 of 200

1

Four resistors are connected as shown in Figure. Find the equivalent resistance between points b and c.

Select one or more of the following:

2 Ω
0.5 Ω
9 Ω
All answers are correct
No correct answer

Explanation

Question 98 of 200

1

Four resistors are connected as shown in Figure. Find the equivalent resistance between points a and c.

Select one or more of the following:

14 Ω
2.5 Ω
4.7 Ω
3.2 Ω
No correct answer

Explanation

Question 99 of 200

1

Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Find the current I1.

Select one or more of the following:

I1=6.00 A
I1=3.00 A
I1=2.00 A
All answers are correct
No correct answer

Explanation

Question 100 of 200

1

Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Find the current I2.

Select one or more of the following:

I1=6.00 A
I1=3.00 A
I1=2.00 A
All answers are correct
No correct answer

Explanation

Question 101 of 200

1

Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Find the current I3.

Select one or more of the following:

I1=6.00 A
I1=3.00 A
I1=2.00 A
All answers are correct
No correct answer

Explanation

Question 102 of 200

1

Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Calculate the power delivered to resistor R1.

Select one or more of the following:

P1=108 W
P1=54 W
P1=36 W
All answers are correct
No correct answer

Explanation

Question 103 of 200

1

Three resistors are connected in parallel as shown in Figure. A potential difference of 18.0 V is maintained between points a and b. Calculate the equivalent resistance of the circuit.

Select one or more of the following:

Req=1.64 Ω
Req=0.61 Ω
Req=18 Ω
All answers are correct
No correct answer

Explanation

Question 104 of 200

1

A single-loop circuit contains two resistors and two batteries, as shown in Figure. (Neglect the internal resistances of the batteries.) Find the current in the circuit.

Select one or more of the following:

I=-0.33 A
I=0.33 A
I=1 A
I=-3 A
No correct answer

Explanation

Question 105 of 200

1

Consider three point charges located at the corners of a right triangle as shown in Figure, where q1 = q3 = 5.0 μC, q2 =-2.0 μC, and a = 0.10 m. Find the resultant force exerted on q3

Select one or more of the following:

F3=(-1.1i+7.9j)N
F3=(7.9i-1.1j)N
F3=(1.1i-7.9j)N
F3=(1.1i+7.9j)N
No correct answer

Explanation

Question 106 of 200

1

An electric dipole is defined as a positive charge q and a negative charge -q separated by a distance 2a. For the dipole shown in Figure, find the electric field E at P due to the dipole, where P is a distance y » a from the origin.

Select one or more of the following:

E≈(k * 2qa)/y^3
E≈(k*2q)/a^3
E≈(k*2)/y^5
E≈2qa/y^3
No correct answer

Explanation

Question 107 of 200

1

A rod of length l has a uniform positive charge per unit length λ and a total charge Q. Calculate the electric field at a point P that is located along the long axis of the rod and a distance a from one end.

Select one or more of the following:

E=(k* Q)/(a(l+a))
E=(k*Q)/(l+a)
E=(k*Q)/al
E=k/(a(l+a))
No correct answer

Explanation

Question 108 of 200

1

Calculate the ratio of the electrostatic to gravitational interaction forces between two electrons, between two protons. At what value of the specific charge q/m of a particle would these forces become equal (in their absolute values) in the case of interaction of identical particles? (γ=6.67·10-11 m3/(kg·s2), me=9·10-31kg, mp=1·10-27kg, ke=8.99·109 N·m2/ C2)

Select one or more of the following:

4·1042 (for electrons); 1·1036 (for proton); q/m=0.86·10-10 C/kg
4·1042 (for proton); 1·1036 (for electrons); q/m=0.86·10-10 C/kg
4·1045 (for proton); 1·1038 (for electrons); q/m=0.86·10-13 C/kg
4·1043 (for electrons); 1·1035 (for proton); q/m=0.86·10-11 C/kg
No correct answer

Explanation

Question 109 of 200

1

Find the currents I1, I2, and I3 in the circuit shown in Figure.

Select one or more of the following:

I1=2 A, I2=-3 A, I3=-1 A
I1=-2 A, I2=3 A, I3=1 A
I1=2 A, I2=-3 A, I3=-5 A
I1=3 A, I2=2 A, I3=1 A
No correct answer

Explanation

Question 110 of 200

1

The water (H2O) molecule has an electric dipole moment of 6.3·10-30 C·m. A sample contains 1021 water molecules, with the dipole moments all oriented in the direction of an electric field of magnitude 2.5·105 N/C. How much work is required to rotate the dipoles from this orientation (θ=0°) to one in which all the moments are perpendicular to the field (θ=90°)?

Select one or more of the following:

1.6·10-24 J
1.6·10-3 J
-1.6·10-3 J
1.6·10-25 J
No correct answer

Explanation

Question 111 of 200

1

A ball is thrown upward. While the ball is in free fall, does its acceleration

Select one or more of the following:

Increases
Decreases
Increases and then decreases
Decreases and then increases
Remain constant

Explanation

Question 112 of 200

1

After a ball is thrown upward and is in the air, its speed in all path

Select one or more of the following:

Increases
Decreases
Increases and then decreases
Decreases and then increases
Remain the same

Explanation

Question 113 of 200

1

If vector B is added to vector A, which two of the following choices must be true in order for the resultant vector to be equal to zero?

Select one or more of the following:

A and B are parallel in the same direction and have same magnitude
A and B are parallel in opposite directions, but have same magnitude
A and B have the same magnitude
A and B are perpendicular but have same magnitude
None of them is right

Explanation

Question 114 of 200

1

A car moves along y-axes. In the figure, velocity of the car as a function of time is shown in three parts (I, II, III). Which statement is ALWAYS true?

Select one or more of the following:

Velocity is constant in part II
A car drives backward in part I
Velocity is negative in part III
Velocity is negative in part I

Explanation

Question 115 of 200

1

What is the cross product of two vectors A and B, if the angle between them is 30 degree, and magnitudes are |A|=4, |B|=2

Select one or more of the following:

5.6
4
0
8
2.5

Explanation

Question 116 of 200

1

When a box rests on the floor, it is acted upon by the gravitational and the _________________ force.

Select one or more of the following:

Centrifugal
Acceleration
Normal
Inertia
Friction

Explanation

Question 117 of 200

1

Motion is produced by

Select one or more of the following:

all forces
unbalanced forces
balanced forces
the absence of force
none of them

Explanation

Question 118 of 200

1

Force is that agent which produces or tends to produce the __________.

Select one or more of the following:

Speed in the body
Acceleration in the body
Constant velocity in the body
Constant angular velocity in the body

Explanation

Question 119 of 200

1

A force of 3N acts perpendicularly to a force of 4N. Their resultant has magnitude of ______

Select one or more of the following:

1N
5N
7N
9N
25N

Explanation

Question 120 of 200

1

In inelastic collision between the two bodies __________.

Select one or more of the following:

Only momentum of the system is conserved
Only the kinetic Energy of the system is conserved
Both the kinetic Energy and Momentum of the system remain the same
Total energy is not conserved

Explanation

Question 121 of 200

1

Work done by a grass cutter is maximum when he pulls it __________.

Select one or more of the following:

Making an angle 450 with the floor
Making an angle 900 with the floor
Along a line parallel to the floor
Making an angle 600 with the floor

Explanation

Question 122 of 200

1

A man does the work if he ___________.

Select one or more of the following:

Goes to fifth floor of the building
Goes to fifth floor of the building and comes back to ground floor
Remain on the ground floor
Goes to the basement and comes back to ground floor

Explanation

Question 123 of 200

1

In elastic collision between the two bodies __________.

Select one or more of the following:

Only momentum of the system is conserved
Only the kinetic Energy of the system is conserved
Both the kinetic Energy and Momentum of the system remain the same
Total energy is not conserved

Explanation

Question 124 of 200

1

When the force and displacement are parallel to each other, then work is __________.

Select one or more of the following:

Minimum
Maximum
None of these
Depends on force magnitude

Explanation

Question 125 of 200

1

In rotational motion, the quantity, which plays the same role as the inertial mass in linear motion, is called ___________.

Select one or more of the following:

Inertia
Angular momentum
Moment of inertia
Torque
Center of mass

Explanation

Question 126 of 200

1

Four identical particles, each with mass m, are arranged in the x, y plane as shown. They are connected by light sticks to form a rigid body. If m = 2.0 kg and a = 1.0 m, the rotational inertia of this array about the y-axis is:

Select one or more of the following:

4.0 kg  m2
12 kg  m2
9.6 kg  m2
4.8 kg  m2
none of these

Explanation

Question 127 of 200

1

Sound travels faster in

Select one or more of the following:

a vacuum
water
steel
air
Sound travels at about the same speed in all of the above media.

Explanation

Question 128 of 200

1

A woman sits on a spinning stool with her arms folded. When she extends her arms, which of the following occurs

Select one or more of the following:

She increases her moment of inertia, thus increasing her angular speed
She increases her moment of inertia, thus decreasing her angular speed.
She decreases her moment of inertia, thus increasing her angular speed
She decreases her moment of inertia, thus decreasing her angular speed
Her angular speed remains constant by conservation of angular momentum

Explanation

Question 129 of 200

1

The pressure at the surface of the ocean is 1 atm (1 x 105 Pa). At what approximate depth in the ocean water (ρ = 1025 kg/m3) would the absolute pressure be 2 atm?

Select one or more of the following:

1 m
5 m
10 m
100 m
1000 m

Explanation

Question 130 of 200

1

A plane loop of wire consisting for the bowling ball that rotates about z-axis?

Select one or more of the following:

+y
–y
+x
–x
+z
–z

Explanation

Question 131 of 200

1

A segment of steel railroad track has a length of 30.000 m when the temperature is 0.0°C. What is its length when the temperature is 40.0°C? (Average linear expansion coefficient for steel is α=11* 10-6 °C-1).

Select one or more of the following:

0.013 m.
30.013 m.
30.130 m.
30.003 m.
31.013 m.

Explanation

Question 132 of 200

1

An ideal gas occupies a volume of 100 cm3 at 20°C and 100 Pa. Find the number of moles of gas in the container (Universal gas constant R= 8.314 J/mol*K).

Select one or more of the following:

4.11 * 10-5 mol
20.11 * 10-6 mol
20.11 * 10-5 mol
1.20 * 10-6 mol
4.11 * 10-6 mol

Explanation

Question 133 of 200

1

The concrete sections of a certain superhighway are designed to have a length of 25.0 m. The sections are poured and cured at 10.0°C. What minimum spacing should the engineer leave between the sections to eliminate buckling if the concrete is to reach a temperature of 50.0°C? (Average linear expansion coefficient for concrete is α=12* 10-6 °C-1).

Select one or more of the following:

1.20 cm
1.25 cm
1.35 cm
25.20 cm
25.40 cm

Explanation

Question 134 of 200

1

Just 9.00 g of water is placed in a 2.00-L pressure cooker and heated to 500°C. What is the pressure inside the container? (Molar mass of water M(H2O) = 18 g/mol, universal gas constant R= 8.314 J/mol*K ).

Select one or more of the following:

16.1 Pa
1.61 Pa
1.61 MPa
161 MPa
161 Pa

Explanation

Question 135 of 200

1

The temperature of a silver bar rises by 10.0°C when it absorbs 1.23 J of energy by heat. The mass of the bar is 525 g. Determine the specific heat of silver.

Select one or more of the following:

128 J/kg . °C
234 J/kg . °C
380 J/kg . °C
860 J/kg . °C
2 010 J/kg . °C

Explanation

Question 136 of 200

1

A 50.0-g sample of copper is at 25.0°C. If 1 200 J of energy is added to it by heat, what is the final temperature of the copper? (Specific heat of copper c= 387 J/kg . °C).

Select one or more of the following:

50 °C
62 °C
77 °C
87°C
99 °C

Explanation

Question 137 of 200

1

Determine the work done on a fluid that expands from i to f as indicated in Figure.

Select one or more of the following:

12 MJ
-12 J
-12 MJ
-6 J
6 MJ

Explanation

Question 138 of 200

1

A gas is taken through the cyclic process described in Figure. Find the net energy transferred to the system by heat during one complete cycle.

Select one or more of the following:

12 kJ
12 J
1200 kJ
4 kJ
6 kJ

Explanation

Question 139 of 200

1

An ideal gas initially at 300 K undergoes an isobaric expansion at 2.50 kPa. If the volume increases from 1.00 m3 to and 12.5 kJ is transferred to the gas by heat, what is the change in its internal energy?

Select one or more of the following:

6.5 kJ
6.5 J
7.5 kJ
13.5 kJ
25 kJ

Explanation

Question 140 of 200

1

A glass window pane has an area of 3.00 m2 and a thickness of 0.600 cm. If the temperature difference between its faces is 25.0°C, what is the rate of energy transfer by conduction through the window? (Thermal conductivity of glass k= 0.8 W/m* °C)

Select one or more of the following:

10 W
100 W
100 kW
1 kW
10 kW

Explanation

Question 141 of 200

1

A cylinder contains a mixture of helium and argon gas in equilibrium at 150°C. What is the average kinetic energy for each type of gas molecule? (Boltzmann constant kB= 1.38* 10-23 J/K).

Select one or more of the following:

8.76* 10-23 J
8.76* 10-21 J
10.8* 10-21 J
10.8* 10-23 J
87.6* 10-21 J

Explanation

Question 142 of 200

1

Calculate the change in internal energy of 3.00 mol of helium gas when its temperature is increased by 2.00 K (Universal gas constant R= 8.314 J/mol*K ).

Select one or more of the following:

49.9 J
4.99 J
499 J
748 J
74.8 J

Explanation

Question 143 of 200

1

A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. What is the final pressure of the gas?

Select one or more of the following:

5.33 atm
4.21 atm
3.39 atm
2.91 atm
1.39 atm

Explanation

Question 144 of 200

1

A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. What are the initial and final temperatures? (Universal gas constant R= 8.314 J/molK, 1 atm= 1.013 105 Pa )

Select one or more of the following:

365 K, 253 K
355 K, 243 K
345 K, 233 K
335 K, 223 K
325 K, 213 K

Explanation

Question 145 of 200

1

A 2.00-mol sample of a diatomic ideal gas expands slowly and adiabatically from a pressure of 5.00 atm and a volume of 12.0 L to a final volume of 30.0 L. Find Q, ΔEint, and W (Universal gas constant R= 8.314 J/mol*K).

Select one or more of the following:

0 J, -4.66 kJ, 4.66 kJ
0 J, 4.66 kJ, - 4.66 kJ
0 J, -4.66 kJ, - 4.66 kJ
0 J, 4.66 kJ, 4.66 kJ
0.66 J, -4.66 kJ, - 4.66 kJ

Explanation

Question 146 of 200

1

A heat engine takes in 360 J of energy from a hot reservoir and performs 25.0 J of work in each cycle. Find the efficiency of the engine.

Select one or more of the following:

6.94 %
14.4 %
23.25 %
45.2 %
100 %

Explanation

Question 147 of 200

1

A heat engine performs 200 J of work in each cycle and has an efficiency of 30.0%. For each cycle, how much energy is (a) taken in and (b) expelled by heat?

Select one or more of the following:

637 J, 437 J
647 J, 447 J
657 J, 457 J
667 J, 467 J
677 J, 477 J

Explanation

Question 148 of 200

1

A particular heat engine has a useful power output of 5.00 kW and an efficiency of 25.0%. The engine expels 8 000 J of exhaust energy in each cycle. Find the energy taken in during each cycle

Select one or more of the following:

10.7 kJ
11.7 kJ
12.7 kJ
13.7 kJ
14.7 kJ

Explanation

Question 149 of 200

1

The unit for permeability is

Select one or more of the following:

Wb/At × m
At/m
At/Wb
Wb

Explanation

Question 150 of 200

1

What is the magnetomotive force in a 75-turn coil of wire when there are 4 A of current through it?

Select one or more of the following:

18.75 At
30 At
300 At
187 At

Explanation

Question 151 of 200

1

The direction of a magnetic field within a magnet is

Select one or more of the following:

from south to north
from north to south
back to front
front to back

Explanation

Question 152 of 200

1

When the north poles of two bar magnets are brought close together, there will be

Select one or more of the following:

no force
a downward force
a force of attraction
a force of repulsion

Explanation

Question 153 of 200

1

The ability of a material to remain magnetized after removal of the magnetizing force is known as

Select one or more of the following:

permeability
reluctance
hysteresis
retentivity

Explanation

Question 154 of 200

1

The voltage induced across a certain coil is 200 mV. A 120 resistor is connected to the coil terminals. The induced current is

Select one or more of the following:

1.7 mA
16 mA
12 mA
120 mA

Explanation

Question 155 of 200

1

The induced voltage across a stationary conductor in a stationary magnetic field is

Select one or more of the following:

zero
reversed in polarity
increased
decreased

Explanation

Question 156 of 200

1

When a solenoid is activated, the force that moves the plunger is

Select one or more of the following:

an electromagnetic field
a permanent magnetic field
varying voltage
a steady current

Explanation

Question 157 of 200

1

What is the magnetomotive force (mmf) of a wire with 8 turns carrying three amperes of current?

Select one or more of the following:

2,400 At
240 At
24 At
2.4 At

Explanation

Question 158 of 200

1

If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage

Select one or more of the following:

remains unchanged
reverses polarity
increases
decreases

Explanation

Question 159 of 200

1

If an electron moves perpendicular to the uniform magnetic field of magnitude 0.35 T with the speed equal to 4.69×106, what is the radius of its circular orbit? (me = 9.11×10-31kg)

Select one or more of the following:

7.63×104
7.63×10-5
7.63×106
0.73×10-6

Explanation

Question 160 of 200

1

Calculate the maximum kinetic energy of protons in a cyclotron of radius 0.50 m in a magnetic field of 0.35 T.

Select one or more of the following:

1.46 KeV
1.46 meV
1.46 MeV
0.146 eV

Explanation

Question 161 of 200

1

A rectangular copper strip 1.5 cm wide and 0.1 cm thick carries a current of 5 A. A 1.2 T magnetic field is applied perpendicular to the strip. Find the Hall voltage that should be produced.

Select one or more of the following:

0.442 µV
0.442 mV
4.42 V
44.2 V

Explanation

Question 162 of 200

1

A toroidal winding carrying a current of 5 A is wound with 300 turns/m of wire. The core is iron, which has a magnetic permeability of 5000µ0 under the given conditions. Find B inside the iron core.

Select one or more of the following:

9.43×〖10〗^(-3)T
9.43×〖10〗^(-2)T
0.943 T
9.43 T

Explanation

Question 163 of 200

1

Assume that a motor having coils with a resistance of 10 Ω is supplied by a voltage of 120 V. When the motor is running at its maximum speed, the back emf is 70V. Find the current in the coils when the motor is first turned on.

Select one or more of the following:

10 A
12 A
1 A
1.2 A

Explanation

Question 164 of 200

1

Assume that a motor having coils with a resistance of 10 Ω is supplied by a voltage of 120 V. When the motor is running at its maximum speed, the back emf is 70 V. Find the current in the coils when the motor has reached maximum speed.

Select one or more of the following:

3 A
4 A
5 A
6 A

Explanation

Question 165 of 200

1

Calculate the inductance of a solenoid containing 300 turns if the length of the solenoid is 25 cm and its cross-sectional area is 4 cm2.

Select one or more of the following:

0.181 mH
0.181 H
1.81 mH
1.81 H

Explanation

Question 166 of 200

1

Calculate the self-induced emf in the solenoid containing 300 turns if the length of the solenoid is 25 cm and the current through it is decreasing at the rate of 50 A/s.

Select one or more of the following:

0.905 mV
9.05 mV
0.905 V
9.05 V

Explanation

Question 167 of 200

1

Calculate the time constant of RL circuit consisting of a 30 mH inductor in series with 6 Ω resistor and 12 V battery.

Select one or more of the following:

180 ms
60 ms
5 ms
2 ms

Explanation

Question 168 of 200

1

Three identical capacitors connected in series. What single capacitance C is “equivalent” to this combination?

Select one or more of the following:

6C
3C
(1/6)C
(1/3)C
2C

Explanation

Question 169 of 200

1

You charge parallel-plate capacitor. When you pull the plates apart to a larger separation and battery remains connected to the capacitor

Select one or more of the following:

Decreases
Remains the same
Alternates
Increases
Changes in an unpredictable way

Explanation

Question 170 of 200

1

The resonant angular frequency of series RLC circuit is

Select one or more of the following:

1/(LC)1/2
LC
(LC)2
(LC)1/2
1/(LC)

Explanation

Question 171 of 200

1

A wire of area 2 mm2 carries a current of 0.4mA. The average current density is

Select one or more of the following:

0.02A/m2
0.2 A/m2
2 A/m2
200 A/m2
20 A/m2

Explanation

Question 172 of 200

1

A square loop of side 0.1m carries 2A current. The magnetic dipole moment of the loop is

Select one or more of the following:

10-1 Am2
2*10-2 Am2
1 Am2
10 Am2
100 Am2

Explanation

Question 173 of 200

1

Current 0.5A flows in square wire loop of 10 cm side. What is magnetic dipole moment of the loop?

Select one or more of the following:

50 Am2
0.005 Am2
0.05 Am2
5 Am2
0.5 Am2

Explanation

Question 174 of 200

1

Of the three chief kinds of magnetic materials (diamagnetic, paramagnetic and ferromagnetic), which are used to make permanent magnets?

Select one or more of the following:

Only paramagnetic
All three
Paramagnetic and ferromagnetic
Only ferromagnetic
Only diamagnetic

Explanation

Question 175 of 200

1

In a photoelectric experiment at a frequency above cut off, the stopping potential is proportional to:

Select one or more of the following:

The energy of the most energetic electron before it is ejected
The energy of the least energetic electron before it is ejected
The energy of the most energetic electrons after it is ejected
The electron potential energy at the surface of the sample
The energy of the least energetic electron after it is ejected

Explanation

Question 176 of 200

1

What is the maximal number of electrons at shell with n=3

Select one or more of the following:

11
18
9
7
3

Explanation

Question 177 of 200

1

For the serial circuit work out the readings on the voltmeters V1 and V2 given the following values for R1=2Ohm and R2=10 Ohm, I1=1A, I2=1A

Select one or more of the following:

V1=1V; V2=5V;
V1=5V; V2=10V;
V1=4V; V2=1V;
V1=10V; V2=2V;
V1=2V; V2=10V;

Explanation

Question 178 of 200

1

What is a good insulator of electricity?

Select one or more of the following:

Silicon
Iron
Rubber
Steel
Salt water

Explanation

Question 179 of 200

1

Induction current opposes the reason causing it. It is the shortest formulation of

Select one or more of the following:

Einstein’s law
Lentz law
Biot-Savart law
Faraday’s law
Ampere’s law

Explanation

Question 180 of 200

1

Potential energy of current carrying loop with magnetic dipole moment µ=1Am2 in magnetic field B of 0.1T, when B and µ make angle 600 is

Select one or more of the following:

-0.05J
-1J
1J
0.5J
0J

Explanation

Question 181 of 200

1

Paramagnetism is closely associated with

Select one or more of the following:

The torque
The force exerted by electron dipole moments on each other
The tendency of electron dipole moments to align with an applied magnetic field
The exchange force between electrons
The tendency of electrons dipole moments to align opposite to an applied magnetic field

Explanation

Question 182 of 200

1

In an electromagnetic wave E0=3*106V/m. B0 equals

Select one or more of the following:

10T
10-2T
100T
1T
10-8T

Explanation

Question 183 of 200

1

What is an insulator of electricity?

Select one or more of the following:

A material that doesn’t allow the free electrons to easily travel through it.
A material that protects the free electrons from excess heat
A material that protects the free electrons from internal energy propagation
A material that allows the free ions to easily travel through it
A material that allows the free electrons to easily travel through it

Explanation

Question 184 of 200

1

Ohm’s law in differential form is

Select one or more of the following:

I={φ1-φ2±ε}/R
ω=γE2
I=V/R
I= ε/(R+r)
j=γE, where j is a current density, γ is a conductivity

Explanation

Question 185 of 200

1

The total number of electron states with n=3 and l=1 for an atom is:

Select one or more of the following:

Four
eight
two
ten
six

Explanation

Question 186 of 200

1

The thermal conductivity is the analog to:

Select one or more of the following:

Thermal expansion
Resistivity
Elasticity
Diffusivity
Viscosity

Explanation

Question 187 of 200

1

Resistance of metals in classical theory of electric conductivity is caused by

Select one or more of the following:

Collision of free electrons with dislocations or clasters
Collision of free electrons with impurity atoms in internodes
Collision of free electrons with each other
Collision of free electrons with vacancy defects
Collision of free electrons with ions of crystal structure

Explanation

Question 188 of 200

1

Which relation defines equipotential surface:

Select one or more of the following:

|E ⃗|=const
E ⃗(Δr) ⃗=const
E ⃗=const
φ=const
dφ/dz=const

Explanation

Question 189 of 200

1

Electric theory of dispersion was evaluated by:

Select one or more of the following:

Lorentz
Newton
Einstein
Minkovsky
Maxwell

Explanation

Question 190 of 200

1

Loop is uniformly rotating with angular velocity ω in uniform magnetic field. Loop has N coils and area of the loop is S. Rotating axis lies on loop’s plane and perpendicular to induction. What is the maximal EMF appeared in the loop:

Select one or more of the following:

NBS/2
NBS
NBS cos(ωt)
NBSω/2
NBSω

Explanation

Question 191 of 200

1

Current I=1A goes through the inductance with inductivity L=10-3H. What is the magnetic flux through inductance:

Select one or more of the following:

2·10-10Wb
2·10-3Wb
4π·10-10Wb
0.5·10-3Wb
10-3Wb

Explanation

Question 192 of 200

1

A toaster is rated at 600W when connected to a 120V source. What current does the toaster carry?

Select one or more of the following:

2A
1A
3A
4A
5A

Explanation

Question 193 of 200

1

Charge carries in metals are

Select one or more of the following:

electrons and holes
only electrons
only holes
positive ions
negative ions

Explanation

Question 194 of 200

1

An electrton traveling with speed v around a circle of radius r is equivalent to a current of:

Select one or more of the following:

evr/2
ev/r
2πer/v
2πev/r
ev/2πr

Explanation

Question 195 of 200

1

The emf inducted in an isolated circuit when the current in the circuit is changing by 10 A/s is 0.3 V. What is the self-inductance?

Select one or more of the following:

3 mH
3 µH
30 µH
30 mH
30 H

Explanation

Question 196 of 200

1

The magnetic field for a given electromagnetic wave has Bmax = 10-6T. Emax equals

Select one or more of the following:

3*102 V/m
10-8 V/m
5 V/m
3 V/m
100 V/m

Explanation

Question 197 of 200

1

An electromagnetic field propagates in +x direction. The electric field at a point in space is momentarily oriented in –z direction. The magnetic field at that point is momentarily oriented in

Select one or more of the following:

–y direction
+y direction
+z direction
+x direction
-x direction

Explanation

Question 198 of 200

1

In RLC circuit angular frequency of AC source rises. Inductive reactance

Select one or more of the following:

Remains the same
Increases
Oscillates about certain value
Alternates
Decreases

Explanation

Question 199 of 200

1

Magnetic flux through closed conducting loop changed from 10Wb to 5Wb in 10ms. The average EMF induced in the loop is

Select one or more of the following:

50V
500V
-5V
-500V

Explanation

Question 200 of 200

1

The magnitude of emf induced in an isolated circuit when the current in the circuit is changing by -10A/s is 0.2 V. What is the self-inductance?

Select one or more of the following:

2µH
20mH
20µH
20H
2mH

	Created by Alina Targaryen almost 8 years ago

Quiz on PhysicsFinal, created by Alina Targaryen on 05/01/2017.

PhysicsFinal

Question 1 of 200

A baseball of mass m is thrown upward with some initial speed. A gravitational force is exerted on the ball

Select one of the following:

Explanation

Question 2 of 200

The kinetic friction will always be

Select one of the following:

Explanation

Question 3 of 200

The unit of coefficient of friction in SI system is

Select one of the following:

Explanation

Question 4 of 200

Whenever a constant force is applied on a body then it will move with __________.

Select one of the following:

Explanation

Question 5 of 200

Power is a __________.

Select one of the following:

Explanation

Question 6 of 200

The dot product of force and velocity is called __________.

Select one of the following:

Explanation

Question 7 of 200

When the force and displacement are perpendicular to each other, then work is __________.

Select one of the following:

Explanation

Question 8 of 200

Centripetal acceleration and tangential acceleration are always __________

Select one of the following:

Explanation

Question 9 of 200

The dimensions of angular momentum are __________.

Select one of the following:

Explanation

Question 10 of 200

The moment of inertia of a wheel about its axle does not depend upon its:

Select one of the following:

Explanation

Question 11 of 200

Two waves have the same frequency. Which wave characteristic must also be identical for both waves?

Select one or more of the following:

Explanation

Question 12 of 200

A mechanical wave generally does NOT

Select one or more of the following:

Explanation

Question 13 of 200

The moment of inertia of a body depends on

Select one or more of the following:

Explanation

Question 14 of 200

A skater can spin faster by pulling in her arms closer to her body or spin slower by spreading her arms out from her body. This is due to

Select one or more of the following:

Explanation

Question 15 of 200

The SI units for Coulomb constant ke are:

Select one or more of the following:

Explanation

Question 16 of 200

The electric field vector E can be expressed as:

Select one or more of the following:

Explanation

Question 17 of 200

Which statements are correct?

Select one or more of the following:

Explanation

Question 18 of 200

Which statements are correct?

Select one or more of the following:

Explanation

Question 19 of 200

If the electric field is uniform and makes an angle θ with the normal to a surface of area A, the electric flux through the surface is:

Select one or more of the following:

Explanation

Question 20 of 200

Gauss’s law says that the net electric flux ΦE through any closed gaussian surface is equal to: