8974306
Descripción
Test por Lakshmi Lakshmanan, actualizado hace más de 1 año
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Creado por Lakshmi Lakshmanan
hace alrededor de 7 años
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Pregunta 1
Pregunta
What is energy?
Respuesta
-
Measure of what an object can do
-
Measure of the matter an object has
-
Measure of the distance covered per unit time
Pregunta 2
Pregunta
Energy is measured in [blank_start]Joules.[blank_end]
Respuesta
-
Joules
Pregunta 3
Pregunta
Which one of the option listed below are types of energy?
Respuesta
-
Nuclear potential energy
-
Acidic energy
-
Kinetic energy
-
Gas energy
Pregunta 4
Pregunta
Energy can be destroyed.
Respuesta
- True
- False
Pregunta 5
Pregunta
Energy can be transformed from one type to another.
Respuesta
- True
- False
Pregunta 6
Pregunta
[blank_start]Heat[blank_end] is a way of transferring energy.
Respuesta
-
Heat
Pregunta 7
Pregunta
Work done is a measure of energy.
Respuesta
- True
- False
Pregunta 8
Pregunta
What unit does work done have?
Respuesta
-
Joules
-
Watts
-
Volts
-
Kilograms
Pregunta 9
Pregunta
Work done calculates how much energy is needed to move an object with a [blank_start]force[blank_end] and a distance.
Respuesta
-
force
-
speed
-
height
Pregunta 10
Pregunta
What is the equation for work done?
Respuesta
-
Work done = force*distance
-
work done=energy /time
Pregunta 11
Pregunta
The force is measured in [blank_start]newtons[blank_end] (N)
Respuesta
-
newtons
Pregunta 12
Pregunta
The distance is measured in centimetres.
Respuesta
- True
- False
Pregunta 13
Pregunta
Power calculates :
Respuesta
-
the rate at which energy is delivered
-
the speed of something
Pregunta 14
Pregunta
P=E/t
Respuesta
- True
- False
Pregunta 15
Pregunta
The unit of power is [blank_start]watt[blank_end] (W) and the [blank_start]time[blank_end] is always in seconds (s).
Respuesta
-
watt
-
Volt
-
Joules
-
time
-
energy
-
distilation
Pregunta 16
Pregunta
Efficiency shows the percentage of energy that is converted into:
Respuesta
-
useful energy
-
wasted energy
Pregunta 17
Pregunta
Efficiency = 100(Useful energy output/ total energy input)
Respuesta
- True
- False
Pregunta 18
Pregunta
The energy contained in foods is [blank_start]chemical[blank_end] energy.
Respuesta
-
chemical
Pregunta 19
Pregunta
What is a calorie?
Respuesta
-
unit of energy used for how much energy is in food
-
unit of speed for how fast a vehicle can travel
Pregunta 20
Pregunta
1 Kcal =4841J
Respuesta
- True
- False
Pregunta 21
Pregunta
What is an energy resource?
Respuesta
-
Where the energy comes from
-
where the source of energy comes from
Pregunta 22
Pregunta
What is a non-renewable energy resource?
Respuesta
-
resource that will one day run out
-
it will never run out
Pregunta 23
Pregunta
Where does energy for tidal power come from?
Respuesta
-
the sun
-
the moon
Pregunta 24
Pregunta
Nuclear power is when radio active material , usually uranium or thorium , is bombarded with neutrons.
Respuesta
- True
- False
Pregunta 25
Pregunta
What is the difference between biomass and biofuel?
Respuesta
-
biomass is used to produce biofuel
-
biomass is bigger than biofuel
Pregunta 26
Pregunta
What is speed?
Respuesta
-
it's the distance covered per unit tme
-
it's the height covered per unit time
Pregunta 27
Pregunta
s=d/t
Respuesta
- True
- False
Pregunta 28
Pregunta
What is the unit for speed?
Respuesta
-
m/s
-
mph
Pregunta 29
Pregunta
What is the unit for distance?
Respuesta
-
metres
-
kilometres
Pregunta 30
Pregunta
On a distance time graph, the steeper the line , the [blank_start]faster[blank_end] the object is moving.
Respuesta
-
faster
Pregunta 31
Pregunta
On a distance time graph, a [blank_start]straight[blank_end] line shows a constant speed.
Respuesta
-
straight
Pregunta 32
Pregunta
Velocity describes the [blank_start]speed[blank_end] at which something is travelling and the [blank_start]direction.[blank_end]
Respuesta
-
speed
-
direction
Pregunta 33
Pregunta
Acceleration = velocity / time
Respuesta
- True
- False
Pregunta 34
Pregunta
What is a contact force?
Respuesta
-
it acts directly on the object
-
it acts at a distance from an object
Pregunta 35
Pregunta
A [blank_start]free body[blank_end] diagram shows all the forces acting on a single object.
Respuesta
-
free body
Pregunta 36
Pregunta
What is weight?
Respuesta
-
the force on an object due to mass and the amount of gravity.
-
the amount of matter an object has
Pregunta 37
Pregunta
What is the equation for weight?
Respuesta
-
Weight =mass *gravity field strength
-
W=mg
-
W=v/t
Pregunta 38
Pregunta
On the earth the gravity is [blank_start]9.8 N/kg.[blank_end]
Respuesta
-
9.8 N/kg
Pregunta 39
Pregunta
On the moon the gravity is [blank_start]1.6 N/kg.[blank_end]
Respuesta
-
1.6 N/kg
Pregunta 40
Pregunta
What are forces measured using?
Respuesta
-
Newton meter
-
ammeter
Pregunta 41
Pregunta
The units for force are:
Respuesta
-
newtons
-
amps
Pregunta 42
Pregunta
Newton's first law- Unbalanced forces cause an acceleration.
Respuesta
- True
- False
Pregunta 43
Pregunta
Newton's second law -An object's mass affects how much force is needed to accelerate it.
Respuesta
- True
- False
Pregunta 44
Pregunta
According to Newton's second law, what's the equation for acceleration?
Respuesta
-
acceleration=force/mass
-
acceleration=mass/force
Pregunta 45
Pregunta
The unit for acceleration is m/s
Respuesta
- True
- False
Pregunta 46
Pregunta
The unit for mass is kg
Respuesta
- True
- False
Pregunta 47
Pregunta
What is newton's 3rd law?
Respuesta
-
Forces acting on an object come in pairs
-
Force is the same as gravity
Pregunta 48
Pregunta
What is electricity?
Respuesta
-
The movement of charged particles, generally electrons.
-
movement of acceleration.
Pregunta 49
Pregunta
[blank_start]Current[blank_end] is the rate of flow of charge.
Respuesta
-
Current
Pregunta 50
Pregunta
Voltage is the [blank_start]energy[blank_end] per charge.
Respuesta
-
energy
Pregunta 51
Pregunta
Resistance is a measure of how hard it is for [blank_start]current[blank_end] to flow.
Respuesta
-
current
Pregunta 52
Pregunta
A conductor allows energy to flow through it as it has many free electrons.
Respuesta
- True
- False
Pregunta 53
Pregunta
What does an ammeter do?
Respuesta
-
Measures the current in a series circuit
-
Measures the current in a parallel circuit
Pregunta 54
Pregunta
The current in a series circuit is the same all around the circuit.
Respuesta
- True
- False
Pregunta 55
Pregunta
The longer the wire, the lower the resistance.
Respuesta
- True
- False
Pregunta 56
Pregunta
power = current * voltage
Respuesta
- True
- False
Pregunta 57
Pregunta
The diode allows current to flow in 1 direction.
Respuesta
- True
- False
Pregunta 58
Pregunta
A motor converts [blank_start]electrical energy[blank_end] into kinetic energy.
Respuesta
-
electrical energy
Pregunta 59
Pregunta
The thermistor changes resistance with water.
Respuesta
- True
- False
Pregunta 60
Pregunta
The buzzer converts electrical energy into [blank_start]sound[blank_end] energy.
Respuesta
-
sound
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