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Worksheets

IGCSE Physics MCQs Year 1

Total questions: 111

Worksheet time: 6hrs 33mins

Name
Class
Date
1.

The diagram shows a rectangular metal sheet close to two rulers. What is the area of the metal sheet?

a)

700 cm^2

b)

675 cm^2

c)

900 cm^2

d)

1125 cm^2

2.

The diagram shows a reading on an ammeter. What is the reading?

a)

0.45 A

b)

0.50 A

c)

4.5 A

d)

5.0 A

3.

The diagram shows the image of a clock in a plane mirror. Which is the actual time?

a)

04:15

b)

04:45

c)

07:15

d)

07:45

4.

The circuit shows a wire WX connected to a cell. The potential difference (p.d.) between W and X is 1.5 V. What is the reading on the voltmeter?

a)

0.4 V

b)

0.6 V

c)

0.9 V

d)

4.0 V

5.

A student uses a ruler to find the volume of water in a tank. She measures the lengths EF and FG.


What other length does she need to measure?

a)

FJ

b)

FK

c)

HI

d)

IJ

6.

A pendulum is set in motion and timed. The time measured for 20 complete swings is 30 s. What is the time for one complete swing of the pendulum?

a)

0.67 s

b)

0.75 s

c)

1.5 s

d)

3.0 s

7.

The diagrams show the scales of three ammeters. Which ammeters show the same current reading?

a)

all three ammeters

b)

ammeter 1 and ammeter 2 only

c)

ammeter 1 and ammeter 3 only

d)

ammeter 2 and ammeter 3 only

8.

The diagrams show the readings on an ammeter in a series circuit before and after the switch in the circuit has been closed.


What is the current in the circuit when the switch is closed?

a)

3.2 A

b)

3.4 A

c)

3.6 A

d)

3.8 A

9.

Diagram 1 shows a voltmeter that is not connected to anything. It shows a small reading, called a zero error, because it is not correctly adjusted.


Diagram 2 shows the same meter used to measure the p.d. across a resistor in a circuit.


What is the p.d. across the resistor?

a)

4.6 V

b)

4.7 V

c)

5.2 V

d)

5.4 V

10.

Each of the following blocks is a different type of metal. Each block has a mass of 12 g.


Which metal has the largest density?

a)
b)
c)
d)
11.

A student measures the volume of a small irregularly-shaped stone.


Which apparatus must be used?

a)

a measuring cylinder containing water and a ruler only

b)

a measuring cylinder containing water only

c)

an empty measuring cylinder and a ruler only

d)

a ruler only

12.

A measuring cylinder contains 10 cm^3 of water. A piece of steel is lowered into the measuring cylinder until it is fully submerged. The volume reading increases to 12 cm^3.


A second piece of steel is lowered into the measuring cylinder so that it is also fully submerged. The volume reading increases to 15 cm^3.


Which row shows the volumes of the two pieces of steel?

a)

Volume of first piece: 2 cm^3;

Volume of second piece: 3 cm^3

b)

Volume of first piece: 2 cm^3;

Volume of second piece: 5 cm^3

c)

Volume of first piece: 12 cm^3;

Volume of second piece: 3 cm^3

d)

Volume of first piece: 12 cm^3;

Volume of second piece: 15 cm^3

13.

The graph shows how the speed of an object changes with time.


How far does the object travel in 10 seconds?

a)

8 m

b)

10 m

c)

40 m

d)

80 m

14.

A car travels at an average speed of 60 km/h for 15 minutes.


How far does the car travel in 15 minutes?

a)

4.0 km

b)

15 km

c)

240 km

d)

900 km

15.

The graph shows the motion of a car for a five-second period.


Which answer is correct?

a)

The car is at rest at: 0.0 s;

The car is moving at a constant speed at: 2.0 s

b)

The car is at rest at: 0.0 s;

The car is moving at a constant speed at: 4.0 s

c)

The car is at rest at: 4.0 s;

The car is moving at a constant speed at: 0.0 s

d)

The car is at rest at: 4.0 s;

The car is moving at a constant speed at: 2.0 s

16.

An object begins to fall close to the Earth's surface. Air resistance can be ignored. Which statement about the object's acceleration is correct?

a)

The acceleration is constant.

b)

The acceleration decreases as the body falls.

c)

The acceleration increases as the body falls.

d)

The acceleration is zero.

17.

The diagrams below are distance-time graphs for four bodies.


Which body is moving with an increasing speed?

a)
b)
c)
d)
18.

A runner runs 300 m at an average speed of 3.0 m/s. She then runs another 300 m at an average speed of 6.0 m/s.


What is her average speed for the total distance of 600 m?

a)

2.0 m/s

b)

4.0 m/s

c)

4.5 m/s

d)

8.0 m/s

19.

The graph shows how the speed of an object varies with time. At which point on the graph is the greatest distance travelled per second?

a)

A

b)

B

c)

C

d)

D

20.

An athlete runs at a speed of 8 m/s for 10 s, and then at a speed of 6 m/s for 12 s.


Which calculation gives the average speed of the athlete in m/s?

a)

8 + 62\frac{8\ +\ 6}{2}

b)

(8⋅10)+(6⋅12)22\frac{\left(8\cdot10\right)+\left(6\cdot12\right)}{22}

c)

(8 ÷ 10)+(6 ÷ 12)22\frac{\left(8\ \div\ 10\right)+\left(6\ \div\ 12\right)}{22}

d)

(10 ÷ 8)+(12÷6)22\frac{\left(10\ \div\ 8\right)+\left(12\div6\right)}{22}

21.

A girl goes for a ride on her bicycle.


The diagram shows how her speed changes with time for part of her journey.


In which labelled section is she moving with constant speed?

a)

A

b)

B

c)

C

d)

D

22.

A boy runs 400 m at an average speed of 4.0 m/s.


He runs the first 200 m in 40 s.


How long does he take to run the second 200 m?

a)

60 s

b)

66.7 s

c)

80 s

d)

140 s

23.

a)

The acceleration is not constant.

b)

The acceleration is negative.

c)

The speed is decreasing.

d)

The velocity is constant.

24.

Which statement about acceleration is correct?

a)

It is related to the changing speed of an object.

b)

It is the distance an object travels in one second.

c)

It is the force acting on an object divided by the distance it travels in one second.

d)

It is the force acting on an object when it is near to the Earth.

25.
a)

Athlete P won the race and was 0.70 s ahead of the athlete in second place.

b)

Athlete P won the race and was 1.90 s ahead of the athlete in second place.

c)

Athlete S won the race and was 1.30 s ahead of the athlete in second place.

d)

Athlete S won the race and was 2.10 s ahead of the athlete in second place.

26.

Which statement correctly describes the effects of placing a heavy load in a car?

a)

It is easier to accelerate the car and easier to bring the car to rest.

b)

It is easier to accelerate the car but more difficult to bring the car to rest.

c)

It is more difficult to accelerate the car and more difficult to bring the car to rest.

d)

It is more difficult to accelerate the car but easier to bring the car to rest.

27.

A mass of 6.0 kg rests on the surface of a planet. On this planet, g = 20 N/kg.


What is the weight of the object?

a)

0.30 N

b)

0.60 N

c)

60 N

d)

120 N

28.

A space probe is taken from the Earth to Mars. The force of gravity on the surface of Mars is less than the force of gravity on the surface of the Earth.


How do the weight and the mass of a space probe on the surface of Mars compare to their values when the probe is on the surface of the Earth?

a)

Mars Weight: decreased; Mars mass: decreased

b)

Mars Weight: decreased; Mars mass: unchanged

c)

Mars Weight: unchanged; Mars mass: decreased

d)

Mars Weight: unchanged; Mars mass: unchanged

29.

A satellite orbits the Earth at constant speed in circular orbit. Which statement is correct?

a)

The resultant force on the satellite is zero.

b)

The resultant force on the satellite is towards the Earth.

c)

The resultant force on the satellite is away from the Earth.

d)

The resultant force on the satellite is in the direction of motion.

30.

Two forces P and Q act on an object. Which diagram shows the resultant of these two forces?

a)
b)
c)
d)
31.
a)

The acceleration of the ball decreases.

b)

The acceleration of the ball increases.

c)

The speed of the ball decreases.

d)

The gravitational force on the ball decreases.

32.

a)

The horizontal speed is greater on the Moon and the ball hits the floor 4.0 m in front of the spring.

b)

The horizontal speed is greater on the Moon and the ball hits the floor more than 4.0 m in front of the spring.

c)

The horizontal speed is the same on the Moon and the ball hits the floor 4.0 m in front of the spring.

d)

The horizontal speed is the same on the Moon and the ball hits the floor more than 4.0 m in front of the spring.

33.

Which choice describes speed and velocity?

a)

Speed: scalar | Velocity: scalar

b)

Speed: scalar | Velocity: vector

c)

Speed: vector | Velocity: scalar

d)

Speed: vector | Velocity: vector

34.

Four balls with different masses are dropped from the heights shown. Air resistance may be ignored. Which ball has the smallest average speed?

a)
b)
c)
d)
35.

An object of mass 2.0 kg is taken from the Earth, where the gravitational field strength is 10 N/kg, to the Moon, where the gravitational field strength is 1.6 N/kg.


Which row is correct?

a)

Earth weight: 0.20 N | Moon weight: 0.80 N

b)

Earth weight: 0.20 N | Moon weight: 3.2 N

c)

Earth weight: 20 N | Moon weight: 0.80 N

d)

Earth weight: 20 N | Moon weight: 3.2 N

36.

What is the best description of the meaning of the 'mass' of an object?

a)

the space occupied by the object

b)

the force that gravity exerts on the object

c)

the resistance of the object to changes in motion

d)

the closeness of packing of the molecules in the object

37.

A ball is thrown vertically upwards through the air. Air resistance acts on the ball. Which graph shows how its speed varies with time?

a)
b)
c)
d)
38.

An object is on the surface of the Earth. Which statement describes the weight of the object?

a)

the quantity of material that the object contains

b)

the quantity of space that the object takes up

c)

the gravitational force acting on the object

d)

the object's resistance to a change in its motion

39.

The gravitational field strength on the Earth is greater than the gravitational field strength on the Moon. The Earth has an atmosphere, but the Moon does not.


Which speed-time graph represents the motion of a light ball dropped from a great height near the surface of the Earth and near the surface of the Moon?

a)
b)
c)
d)
40.
a)

Force: decreases | Acceleration: decreases

b)

Force: decreases | Acceleration: increases

c)

Force: increases | Acceleration: decreases

d)

Force: increases | Acceleration: increases

41.
a)

6 cm

b)

10 cm

c)

26 cm

d)

30 cm

42.
a)

P + Q = R

b)

P + R = Q

c)

P = Q = R

d)

P = Q + R

43.
a)

0.53 m

b)

1.1 m

c)

1.9 m

d)

2.5 m

44.
a)

P equals Q

b)

P is less than Q

c)

(P x a) is equal to (Q x b)

d)

(P x a) is greater than (Q x (a + b))

45.

Which statement gives a complete description of any object that is in equilibrium?

a)

There are no forces acting.

b)

There is no resultant force.

c)

There is no resultant force and no resultant turning effect.

d)

There is no resultant turning effect.

46.

What is the unit of the moment of a force?

a)

N

b)

N/kg

c)

N/m

d)

Nm

47.
a)

80 N

b)

100 N

c)

180 N

d)

225 N

48.
a)

0.67 N

b)

4.0 N

c)

6.0 N

d)

9.0 N

49.
a)

moves towards the bottom of the page

b)

moves to the left

c)

moves to the right

d)

moves towards the top of the page

50.
a)

W/2

b)

W

c)

3W/2

d)

2W

51.
a)

0.60 g/cm^3

b)

0.67 g/cm^3

c)

1.5 g/cm^3

d)

1.7 g/cm^3

52.
a)

P: Falls

Q: Falls

b)

P: Falls

Q: Rises

c)

P: Rises

Q: Falls

d)

P: Rises

Q: Rises

53.
a)

P/1.3

b)

P

c)

1.3P

d)

1.7P

54.
a)

0.5 cm

b)

2 cm

c)

50 cm

d)

200 cm

55.
a)

15 kg/m^3

b)

540 kg/m^3

c)

1500 kg/m^3

d)

54 000 kg/m^3

56.
a)

100 000 Pa

b)

500 000 Pa

c)

1 000 000 Pa

d)

5 000 000 Pa

57.
a)

Force at point: greater than flat surface

Pressure at point: greater than flat surface

b)

Force at point: greater than flat surface

Pressure at point: less than flat surface

c)

Force at point: same as flat surface

Pressure at point: greater than flat surface

d)

Force at point: same as flat surface

Pressure at point: less than flat surface

58.
a)

1.02 × 104 Pa1.02\ \times\ 10^4\ Pa  

b)

1.02 × 105 Pa1.02\ \times\ 10^5\ Pa  

c)

1.02 × 106 Pa1.02\ \times\ 10^6\ Pa  

d)

1.02 × 107 Pa1.02\ \times\ 10^7\ Pa  

59.

A mass bounces up and down on a steel spring. The diagram shows the mass and the spring at different points during the motion.

At which point does the mass have the least gravitational potential energy and at which point is the most elastic energy stored in the spring.

a)

Least GPE: Mass moving down

Most Elastic Energy: Mass moving up

b)

Least GPE: Mass moving down

Most Elastic Energy: Lowest point

c)

Least GPE: Lowest point

Most Elastic Energy: Mass moving up

d)

Least GPE: Lowest point

Most Elastic Energy: Lowest point

60.

Brakes are used to slow down a moving car.

Into which form of energy is most of the kinetic energy converted as the car slows down?

a)

Chemical

b)

Elastic

c)

Thermal

d)

Sound

61.

A box of mass 8.0 kg is lifted from the ground and placed on a shelf. The box gains 100 J of potential energy.

The box falls off the shelf. Air resistance can be ignored.

At what speed does the box hit the ground?

a)

3.5 m/s

b)

5.0 m/s

c)

25 m/s

d)

28 m/s

62.

The diagram shows part of a rollercoaster ride with the car at different positions.

The car runs freely down from position X to position Y and up the hill on the other side.

What happens to the kinetic energy and to the gravitational potential energy of the car as it moves from position X to position Y?

a)

KE: decreases

GPE: decreases

b)

KE: decreases

GPE: increases

c)

KE: increases

GPE: decreases

d)

KE: increases

GPE: increases

63.

A ball is at rest at the top of a hill. It rolls down the hill. At the bottom of the hill the ball hits a wall and stops.

Which energy changes occur?

a)

GPE -> Internal Energy -> KE

b)

GPE -> KE -> Internal Energy

c)

KE -> GPE -> Internal Energy

d)

KE -> Internal Energy -> GPE

64.

Electrical energy may be obtained from nuclear fission.

In which order is the energy transferred in this process?

a)

nuclear fuel -> generator -> reactor & boiler -> turbines

b)

nuclear fuel -> generator -> turbines -> reactor & boiler

c)

nuclear fuel -> reactor & boiler -> generator -> turbines

d)

nuclear fuel -> reactor & boiler -> turbines -> generator

65.

Electrical energy may be obtained from nuclear fission.

In which order is the energy transferred in this process?

a)

nuclear fuel > generator > reactor and boiler > turbines

b)

nuclear fuel > generator > turbines > reactor and boiler

c)

nuclear fuel > reactor and boiler > generator > turbines

d)

nuclear fuel > reactor and boiler > turbines > generator

66.

Which energy resource has the Sun as its only source of energy?

a)

geothermal

b)

nuclear

c)

oil

d)

tidal

67.

Which of the following energy resources is renewable?

a)

oil

b)

solar

c)

coal

d)

nuclear

68.

Which of the following resources is non-renewable

a)

solar

b)

natural gas

c)

wind

d)

tidal

69.

Which of these is designed to convert chemical energy into light energy

a)

electric lamp

b)

gas lamp

c)

microphone

d)

electric motor

70.

Which of the following energy resources relies on fuel being consumed?

a)

wind

b)

waves

c)

nuclear fission

d)

hydroelectricity

71.

A car of mass 500 kg is moving at 10 m/s. The engine does work on the car and the speed increases to 16 m/s.

How much work is done by the engine to increase the speed of the car?

a)

3000 J

b)

9000 J

c)

39000 J

d)

78000 J

72.

A man carries 20 tiles from the ground to the roof of a house. Each tile has a mass of 1.2 kg. The roof of the house is 15 m above the ground.

How much work does the man do against gravity on the tiles in carrying them to the roof?

a)

36 J

b)

180 J

c)

360 J

d)

3600 J

73.

A car is moving along a straight horizontal road. The car has 1.6 MJ of kinetic energy. The car accelerates for 20 s until the kinetic energy of the car increases to 2.5 MJ.

What is the minimum average power developed by the car engine for this acceleration?

a)

45 W

b)

205 W

c)

45 kW

d)

205 kW

74.

A force of 25 N acts on an object. The work done by the force is 400 J.

How far does the object move in the direction of the force?

a)

6.3 cm

b)

16 cm

c)

16 m

d)

10 km

75.

A motor of power P exerts a force F on an object. The object moves a distance d during the time t that the force acts.

Which equation is used to calculate the time t?

a)

t = FPdt\ =\ \frac{F}{Pd}  

b)

t = FdPt\ =\ \frac{Fd}{P}  

c)

t = PdFt\ =\ \frac{Pd}{F}  

d)

t = PFdt\ =\ \frac{P}{Fd}  

76.

A scientist uses an electric motor to lift a load through a vertical distance of 2.0 m.

He then increases the input power to the motor and repeats the experiment. The efficiency of the motor does not change.

Which answer correctly describes the effect that this has on the useful work done lifting the load and the time taken to lift it?

a)

Work done: increases

Time take: decreases

b)

Work done: stays the same

Time take: decreases

c)

Work done: decreases

Time take: stays the same

d)

Work done: stays the same

Time take: stays the same

77.

A rope, connected to a pulley system and motor is used to lift different objects through different distances. The time taken to lift each object is the same. The diagrams are NOT to scale.

Which motor requires the greatest power?

a)
b)
c)
d)
78.

A liquid is evaporating. The liquid is not boiling.

Which statement about the liquid is correct at an instant in time?

a)

Any molecule can escape, and from any part of the liquid.

b)

Any molecule can escape, but only from the liquid's surface.

c)

Only molecules with enough energy can escape, and only from the liquid's surface.

d)

Only molecules with enough energy can escape, but from any part of the liquid.

79.

A gas is contained in a sealed container in a laboratory. The temperature of the gas increases.

What happens to the average speed and what happens to the total kinetic energy of the gas molecules?

a)

Average speed: does not change | Total kinetic energy: does not change

b)

Average speed: does not change | Total kinetic energy: increases

c)

Average speed: increases | Total kinetic energy: does not change

d)

Average speed: increases | Total kinetic energy: increases

80.

Which equation can be used to calculate the pressure at a depth h beneath the surface of a liquid?

a)

p=h ρgp=\frac{h}{\ \rho g}  

b)

p=hρgp=\frac{h\rho}{g}  

c)

p=hρgp=h\rho g  

d)

p=1hρgp=\frac{1}{h\rho g}  

81.

A fixed mass of gas is trapped in a container. The temperature of the gas is increased but the volume of the gas is kept constant.

How does this change affect the kinetic energy of the molecules and the pressure on the walls of the container?

a)

Kinetic Energy: increases | Pressure: increases

b)

Kinetic Energy: stays the same | Pressure: increases

c)

Kinetic Energy: increases | Pressure: decreases

d)

Kinetic Energy: decreases | Pressure: increases

82.

An object is 20 cm below the surface of a liquid. The density of the liquid is 1200 kg/m^3.

What is the pressure on the object due to the liquid?

a)

600 Pa

b)

2400 Pa

c)

60000 Pa

d)

240000 Pa

83.

Which statement about the evaporation of a liquid is correct?

a)

The least energetic molecules escape from the surface and the temperature of the liquid decreases.

b)

The least energetic molecules escape from the surface and the temperature of the liquid increases.

c)

The most energetic molecules escape from the surface and the temperature of the liquid decreases.

d)

The most energetic molecules escape from the surface and the temperature of the liquid increases.

84.

A bubble of gas is formed deep under water. The bubble has a volume of 40 cm^3 and the pressure inside the bubble is P.

The bubble rises up thorugh the water. The volume of the bubble increases to 56 cm^3 and the pressure becomes 100 kPa. The temperature of the gas does not change.

What is the initial pressure P?

a)

71 Pa

b)

71 kPa

c)

140 Pa

d)

140 kPa

85.

The density of mercury is 13600 kg/m^3.

What is the pressure at the bottom of a column of mercury that has a height of 75.0 cm?

a)

1.02 x 10^4 Pa

b)

1.02 x 10^5 Pa

c)

1.02 x 10^6 Pa

d)

1.02 x 10^7 Pa

86.

Which row describes the arrangement and the motion of the molecules in a gas?

a)

Arrangement: far apart | Motion: move freely

b)

Arrangement: far apart | Motion: vibrate only

c)

Arrangement: tightly packed | Motion: move freely

d)

Arrangement: tightly packed | Motion: vibrate only

87.

A bubble of air of volume 3.0 mm^3 is under water. The bubble is at a depth where the pressure of the air inside the bubble is four times atmospheric pressure.

The temperature of the air in the bubble stays the same as it rises to the surface.

What is the volume of the air in the bubble as it reaches the surface?

a)

3.0 mm^3

b)

9.0 mm^3

c)

12 mm^3

d)

15 mm^3

88.

Water in a beaker evaporates when left on a bench for a period of time.

Which three factors all affect the rate of evaporation of the water?

a)

wind speed, surface area, temperature

b)

wind speed, temperature, volume

c)

wind speed, surface area, volume

d)

surface area, temperature, volume

89.

Wet clothes are hanging outside to dry.

Which condition decreases the rate of evaporation of the water from the clothes?

a)

folded clothes

b)

higher temperature

c)

wetter clothes

d)

windy day

90.

The diagram shows four labelled changes of state between solid, liquid, and gas.

Which changes need an energy input?

a)

P and Q

b)

Q and R

c)

R and S

d)

S and P

91.

Which change in the design of a liquid-in-glass thermometer makes it more sensitive?

a)

a larger liquid reservoir

b)

a longer tube

c)

a smaller liquid reservoir

d)

a wider tube

92.

A liquid turns into a gas. This occurs only at one particular temperature, and the change happens throughout the liquid.

What is this process called?

a)

boiling

b)

condensation

c)

evaporation

d)

fusion

93.

One end of a rod of copper is placed in hot water. Thermal energy travels along the rod to make the other end warmer.

What is the behaviour of the copper at an atomic level that accounts for most of the transfer of thermal energy from one end to the other?

a)

Atoms at the hot end gain kinetic energy and move towards the other end.

b)

Atoms at the hot end expand, colliding with other atoms and transferring energy.

c)

Free electrons at the hot end gain energy and move towards the other end, colliding with atoms along the rod.

d)

Free electrons at the hot end gain energy from the hot water and move directly to the other end.

94.

The same quantity of thermal energy is supplied to each of four blocks. Each block is made from a different material.

Which block has the greatest thermal capacity?

a)
b)
c)
d)
95.

The diagram shows a liquid-in-glass thermometer.

Which change to the design would result in a more sensitive thermometer?

a)

Increase the density of the liquid.

b)

Increase the diameter of the capillary tube.

c)

Increase the number of scale markings.

d)

Increase the volume of the bulb.

96.

An aluminium block has a mass of 200 g.

The specific heat capacity of aluminium is 900 J/(kg °C).

How much energy is needed to increase the temperature of the block from 20 °C to 110 °C?

a)

2.0 J

b)

2000 J

c)

16200 J

d)

16200000 J

97.

The diagram shows the apparatus used to measure the specific latent heat of vaporisation of water.

After the water begins to boil, 110 g of water is converted to steam in 120 s.

Using these results, what is the value of the specific latent heat of vaporisation of water?

a)

1.8 J/kg

b)

1800 J/kg

c)

2200 J/kg

d)

2200000 J/kg

98.

Some ice is slowly heated and its temperature is measured. A graph is plotted of temperature against time.

Which row describes what happens to the thermal energy and to the temperature in section X?

a)

Thermal Energy: gained by ice | Temperature of ice: rises

b)

Thermal Energy: gained by ice | Temperature of ice: stays the same

c)

Thermal Energy: not gained by ice | Temperature of ice: rises

d)

Thermal Energy: not gained by ice | Temperature of ice: stays the same

99.

A solid is heated causing it to expand.

What effect does this have on its mass and on its density?

a)

Mass: decreases | Density: decreases

b)

Mass: decreases | Density: stays constant

c)

Mass: stays constant | Density: decreases

d)

Mass: stays constant | Density: stays constant

100.

The diagrams show four blocks of steel. The blocks are all drawn to the same scale.

The same quantity of thermal energy is given to each block.

Which block shows the greatest rise in temperature?

a)

A

b)

B

c)

C

d)

D

101.

Why are metals better thermal conductors than other solids?

a)

Metals contain free electrons which help transfer energy.

b)

Molecules in metals are in fixed positions.

c)

Molecules in metals can move freely.

d)

Molecules in metals vibrate faster than those in other solids.

102.

Two freezers X and Y are identical except that one has a door opening at the front and the other has a door opening at the top.

Both doors are the same size and are opened for the same amount of time.

Which freezer gains the least amount of thermal energy in this time and why?

a)

Freezer: X | Reason: cold air falls

b)

Freezer: X | Reason: warm air falls

c)

Freezer: Y | Reason: cold air falls

d)

Freezer: Y | Reason: warm air falls

103.

The diagram shows a vacuum flask used to keep a liquid warm.

Which methods of heat loss are reduced by the vacuum between the silvered walls?

a)

conduction only

b)

conduction and convection only

c)

convection and radiation only

d)

conduction, convection, and radiation

104.

In countries where it is usually hot, houses are often painted white.

What is the reason for this?

a)

White surfaces are good reflectors of radiant energy.

b)

White surfaces are good transmitters of radiant energy.

c)

White surfaces are good absorbers of radiant energy.

d)

White surfaces are good emitters of radiant energy.

105.

Which method of thermal transfer occurs when the density of some of a liquid decreases and the liquid moves upwards?

a)

conduction

b)

convection

c)

evaporation

d)

radiation

106.

The diagram shows a tent made from a new material.

What type of material should the tent be made of to reflect the radiant energy from the Sun?

a)

Texture: dull | Colour: black

b)

Texture: dull | Colour: white

c)

Texture: shiny | Colour: black

d)

Texture: shiny | Colour: white

107.

A beaker contains some cold water. A purple crystal is placed on the bottom of the beaker. The beaker is gently heated beneath the crystal. The crystal dissolves in the water. The colour spreads, as shown in the diagram.

Three students each make a statement about the experiment.

Studen 1 says the purple water is less dense than the rest of the water.

Student 2 says the purple water is warmer than the rest of the water.

Student 3 says all of the water will eventually get heated, even though water is a poor conductor of thermal energy.

Which students are correct?

a)

1 and 2 only

b)

1 and 3 only

c)

2 and 3 only

d)

1, 2, and 3

108.

A surface is made so that it is a good source of infrared radiation.

Which surface is NOT suitable?

a)

a surface that is painted matt black

b)

a surface that is painted white

c)

a surface that is heated to a high temperature

d)

a surface that has a large surface area

109.

In a cold country, the ground is covered in snow. There is a pile of black sand outdoors and its temperature is the same as that of the snow. A man sprinkles a thin layer of this sand over the snow.

Why does the black sand help to melt the snow during the day?

a)

Any thermal energy still left in the sand will melt the snow.

b)

The black sand is a good absorber of the infrared radiation from the Sun.

c)

The black sand is a good conductor of thermal energy.

d)

The black sand lowers the melting point of the snow.

110.

A sealed metal box contains a fixed mass of air. The sides of the box are insulated.

A scientist investigates the thermal conductivity of air. She measures how quickly thermal energy passes between the top and bottom of the box.

Which row gives the correct procedure and conclusion?

a)

Procedure: heat bottom surface | Conclusion: air is a good thermal conductor

b)

Procedure: heat bottom surface | Conclusion: air is a poor thermal conductor

c)

Procedure: heat top surface | Conclusion: air is a good thermal conductor

d)

Procedure: heat top surface | Conclusion: air is a poor thermal conductor

111.

The diagram shows a pan used for cooking food.

Which row is correct for the materials used to make the base and the handle of the pan?

a)

Base: good thermal conductor | Handle: good thermal conductor

b)

Base: good thermal conductor | Handle: poor thermal conductor

c)

Base: poor thermal conductor | Handle: good thermal conductor

d)

Base: poor thermal conductor | Handle: poor thermal conductor

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