Quiz about Energy Work and Power IGCSE

Question 1

A solar panel is used to recharge a battery. The solar panel produces 0.80 W of electrical power.

The panel is 20% efficient.

What is the power input of the sunlight onto the solar panel?

Accepted Answer

4.0 W

Answer

0.16 W

Answer

8.0 W

Answer

16 W

Question 2

The diagrams show four different athletes training by doing pull-ups.

Which athlete does the most work?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 3

A motor is used to lift a load of 40 N.

The power of the motor is 40 W and the system is 20% efficient.

How long does it take the motor to lift the load through 0.50 m?

Accepted Answer

2.5 s

Answer

0.50 s

Answer

5.0 s

Answer

25 s

Question 4

The diagrams show athletes training by stretching springs.

Each spring has the same stiffness.

Which athlete does the most work?

Accepted Answer

Option D is correct

Answer

A.

Answer

B.

Answer

C.

Question 5

An electric generator produces an electromotive force (e.m.f.) of 200 V and produces a current of 3.0 A in a circuit.

The generator is driven by an engine with a power of 2.4 kW.

What is the efficiency of the generator?

Accepted Answer

25%

Answer

2.8%

Answer

28%

Answer

36%

Question 6

Different processes have different efficiencies.

Which row shows the most efficient process?

Accepted Answer

A

Answer

B

Answer

C

Answer

D

Question 7

A 150 W filament lamp has an efficiency of 10%. A 40 W compact fluorescent lamp (CFL) has an

efficiency of 30%.

Each lamp is switched on for the same amount of time.

Which lamp produces more light and which lamp converts more energy into other forms of

energy

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 8

A lamp has a power input of 5.0 W. It wastes 1.0 W of power heating the surroundings.

What is the efficiency of the lamp?

Accepted Answer

80%

Answer

20%

Answer

50%

Answer

120%

Question 9

A car of mass 800 kg travels over a hill of height h.

By travelling to the top of the hill, the car gains 40000 J of gravitational potential energy.

The gravitational field strength g is 10 N /kg.

What is the height h of the hill?

Accepted Answer

5.0 m

Answer

20 m

Answer

50 m

Answer

500 m

Question 10

A pendulum bob swings along the path WXYZ and back again. Resistive forces can be ignored.

Which statement describes the total energy of the bob?

Accepted Answer

It has the same value at W, X, Y and Z

Answer

It has a maximum value at X.

Answer

It has a maximum value at Y

Answer

It has a maximum value at Z

Question 11

An athlete runs 300 metres up a hill at a steady speed of 3.0 m/s.

She then immediately runs the same distance down the hill at a steady speed of 6.0 m / s.

What is her average speed for the 600 metre run?

Accepted Answer

4.0 m/s

Answer

2.0 m/s

Answer

3.0 m/s

Answer

4.5 m/s

Question 12

Which statement is correct?

Accepted Answer

The unit of mass is the kilogram and the unit of weight is the newton.

Answer

Mass is a gravitational force but weight is not a gravitational force.

Answer

Mass is not a gravitational force and weight is not a gravitational force.

Answer

The unit of mass is the newton and the unit of weight is the kilogram.

Question 13

The diagram shows a bird in flight. The bird is flying in a horizontal direction to the right.

In which direction does air resistance act on the bird?

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 14

A car is travelling along a straight horizontal road. The speed-time graph is shown.

In which labelled part of the journey is the resultant force on the car zero?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 15

A man pulls a truck a distance of 20 m, as shown in the three diagrams.

Which statement concerning the work done against gravity is correct?

Accepted Answer

Most work is done in 1.

Answer

No work is done in 3.

Answer

The work done in all three is equal.

Answer

The work done in 1 and 2 is equal.

Question 16

A skier walks from the bottom of a ski slope to the top and gains 10 000 J of gravitational potential energy.

She skis down the slope. At the bottom of the slope, her kinetic energy is 2000 J.

How much energy is dissipated in overcoming friction and air resistance as the skier moves down the slope?

Accepted Answer

8 000 J

Answer

2 000 J

Answer

10 000 J

Answer

12 000 J

Question 17

Four different children run up the same set of stairs. For which child is the useful power to climb the stairs the greatest?

Accepted Answer

mass of child = 70 kg; time taken = 15 s.

Answer

mass of child = 40 kg; time taken = 15 s.

Answer

mass of child = 50 kg; time taken = 25 s.

Answer

mass of child = 60 kg; time taken = 25 s.

Question 18

A steel ball is fired vertically upwards with a velocity v. The ball reaches a height h.

The same ball is now fired vertically upwards from the same position with a velocity 2v.

Air resistance can be ignored.

What is the new height reached by the ball?

Accepted Answer

4h

Answer

h

Answer

2h

Answer

8h

Energy Work and Power IGCSE

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