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PhysX #2

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just quiz
Hanzo Conard
Quiz por Hanzo Conard, atualizado more than 1 year ago
Hanzo Conard
Criado por Hanzo Conard quase 8 anos atrás
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Resumo de Recurso

Questão 1

Questão
Which of the following is not generally observed in a geomagnetic storm?
Responda
  • Charged particles streaming out from the Sun
  • Fluctuations in the Earth’s magnetic field
  • Disruption of electrical power transmission
  • Disruption of microwave propagation

Questão 2

Questão
A device that reverses magnetic field polarity to keep a dc motor rotating is
Responda
  • A solenoid
  • An armature coil
  • A commutator
  • A field coil

Questão 3

Questão
When the speed at which a conductor is moved through a magnetic field is increased, the induced voltage
Responda
  • Increases
  • Decreases
  • Remains constant
  • Reaches zero

Questão 4

Questão
For a given wirewound core, an increase in current through the coil
Responda
  • Reverses the flux lines
  • Decreases the flux density
  • Increases the flux density
  • Causes no change in flux density

Questão 5

Questão
Which statements are correct?
Responda
  • 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

Questão 6

Questão
When a box rests on the floor, it is acted upon by the gravitational and the _________________ force.
Responda
  • Centrifugal
  • Acceleration
  • Normal
  • Inertia
  • Friction

Questão 7

Questão
Motion is produced by
Responda
  • All forces
  • Unbalanced forces
  • Balanced forces
  • The absence of force
  • None of them

Questão 8

Questão
In inelastic collision between the two bodies __________.
Responda
  • 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

Questão 9

Questão
In elastic collision between the two bodies __________.
Responda
  • 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

Questão 10

Questão
When the force and displacement are parallel to each other, then work is __________.
Responda
  • Minimum
  • Maximum
  • None of these
  • Depends on force magnitude

Questão 11

Questão
In rotational motion, the quantity, which plays the same role as the inertial mass in linear motion, is called ___________.
Responda
  • Inertia
  • Angular momentum
  • Moment of inertia
  • Torque
  • Center of mass

Questão 12

Questão
A sound wave can be characterized as
Responda
  • A transverse wave
  • A longitudinal wave
  • A transverse wave or a longitudinal wave, depending on the nature of its source
  • One that carries no energy
  • A wave that does not require a medium to be transmitted from one place to the other

Questão 13

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

Questão 14

Questão
The ability of a material to remain magnetized after removal of the magnetizing force is known as
Responda
  • Permeability
  • Reluctance
  • Hysteresis
  • Retentivity

Questão 15

Questão
The induced voltage across a stationary conductor in a stationary magnetic field is
Responda
  • Zero
  • Reversed in polarity
  • Increased
  • Decreased

Questão 16

Questão
When a solenoid is activated, the force that moves the plunger is
Responda
  • An electromagnetic field
  • A permanent magnetic field
  • Varying voltage
  • A steady current

Questão 17

Questão
If a loop in a basic dc generator suddenly begins rotating at a faster speed, the induced voltage
Responda
  • Remains unchanged
  • Reverses polarity
  • Increases
  • Decreases

Questão 18

Questão
You charge parallel-plate capacitor. When you pull the plates apart to a larger separation and battery remains connected to the capacitor
Responda
  • Decreases
  • Remains the same
  • Alternates
  • Increases
  • Changes in an unpredictable way

Questão 19

Questão
Induction current opposes the reason causing it. It is the shortest formulation of
Responda
  • Einstein’s law
  • Lentz law
  • Biot-Savart law
  • Faraday’s law
  • Ampere’s law

Questão 20

Questão
Paramagnetism is closely associated with
Responda
  • 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

Questão 21

Questão
The thermal conductivity is the analog to:
Responda
  • Thermal expansion
  • Resistivity
  • Elasticity
  • Diffusivity
  • Viscosity

Questão 22

Questão
Resistance of metals in classical theory of electric conductivity is caused by
Responda
  • 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

Questão 23

Questão
Electric theory of dispersion was evaluated by:
Responda
  • Lorentz
  • Newton
  • Einstein
  • Minkovsky
  • Maxwell

Questão 24

Questão
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:
Responda
  • NBS/2
  • NBS
  • NBScos(wt)
  • NBSw/2
  • NBSw

Questão 25

Questão
An electrton traveling with speed v around a circle of radius r is equivalent to a current of:
Responda
  • evr/2
  • ev/r
  • 2πer/v
  • 2πev/r
  • ev/2πr

Questão 26

Questão
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
Responda
  • –y direction
  • +y direction
  • +z direction
  • +x direction
  • -x direction

Questão 27

Questão
In RLC circuit angular frequency of AC source rises. Inductive reactance
Responda
  • Remains the same
  • Increases
  • Oscillates about certain value
  • Alternates
  • Decreases

Questão 28

Questão
The rapid exponential decay in just a few cycles of the charge on the plates of capacitor in an RLC circuit might be due to:
Responda
  • A large capacitance
  • A small capacitance
  • A large resistance
  • A small resistance
  • A large inductance

Questão 29

Questão
Intrinsic semiconductors are
Responda
  • Materials doped by impurities
  • Pure elemental materials without impurities
  • Materials doped by donor impurity
  • Materials doped by acceptor impurity
  • Any materials

Questão 30

Questão
In a charge-free region of space, closed container is placed in an electric field. A requirement for the total electric flux through the surface of the container to be zero is that
Responda
  • The field must be uniform
  • The container must be oriented in a certain way
  • The container must be symmetric
  • The requirement does not exist – the total electric flux is zero no matter what

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