1.

The energy transformation that occurs when sodium hydroxide is dissolved in water is

2.

The energy transformation that takes place in a solar cell is

3.

Which of the following statements are reasons for conserving energy?

I. Insufficient production of energy

II. Increasing demand of energy

III. Limiting production of carbon (IV) oxide

4.

Determine the potential energy of a block of mass 2 kg placed on a building 10 m tall.

[g = 10 ms^-2]

5.

A torchlight derives its energy from

6.

Which of the following energy changes takes place when a church bell is tolled?

7.

A torch light bulb lights up when connected to a dry cell. What type of energy is obtained from the cell?

8.

A dam for generating power is constructed across a river. What type of energy is possessed by the water behind the dam?

9.

Which of the following is the energy possessed by an object placed on a table?

10.

A car battery produces electrical energy from

11.

The law of conservation of energy states that energy can

12.

The type of energy stored in fuels is called

13.

An object at rest may have

14.

When the palms of the hand are rubbed together, kinetic energy is changed to

15.

According to the principle of conservation of energy, ‘energy can

16.

The food we eat undergoes slow oxidation in our bodies to produce heat. In this process

17.

A stone released from a catapult was able to kill a bird because

18.

In which of the following electrical appliances is electrical energy mainly converted to heat energy?

19.

The energy for lighting a torchlight bulb comes from the

20.

Which of the following energy changes takes place when a church bell is tolled?

21.

A car head lamp lights up when connected to a battery. What type of energy is obtained from the battery?

22.

Which of the following materials transforms electrical energy into light energy?

23.

The type of energy stored in food is referred to as

24.

Which of the following appliances transform(s) electrical energy to heat energy?

I. Swish oven
II. Hair drier
III. Refrigerator motor

25.

The energy that causes the turbine of hydro-electric plant to rotate is

26.

The energy possessed by a compressed spring is a

27.

A ball is dropped from a height to the ground. The energy possessed by the ball just before it strikes the ground is called

28.

A body of mass 50 kg falls through a height of 5 m. If the acceleration due to gravity is 10 ms^-2, calculate the loss in potential energy.

29.

When the brakes of a bicycle in motion are applied for a long time the wheels become hot. This is because of a change of energy from

30.

The energy stored in food is

31.

Which of the following energy transformations takes place at a hydroelectric power station?

32.

The types of energy produced when the hands are vigorously rubbed against each other are

33.

Which of the following items converts chemical energy to electrical energy?

34.

When mango is falling from a tree, its potential energy is changed to

35.

Electricity is used by appliances to do work. This means that electricity is a form of

36.

The type of energy obtained when an electric bulb is connected to a batter is

37.

Which of the following energy changes takes place in ringing bell?

38.

In which of the positions Q,R,S,T in the diagram below will a body have the greatest potential energy?

39.

A solar cell produces electrical energy from

40.

The energy transformation that takes place in a car battery is

41.

What kind of energy transformation takes place in an electric motor?

42.

Which of the following devices converts electrical energy into sound energy?

43.

In which of the following devices is electrical energy transformed into light energy

44.

A 10 kg object is raised to a height of 20 m. What is the magnitude of its potential energy?

[Take g = 10 ms^-2]

45.

An object is thrown from the ground with a velocity of 5 m/s. If the object has a mass of 2kg, what will be its potential energy at the top-most point of its trajectory?