Level: JHS, Basic 7 | Subject: Integrated Science | Strand: Forces and Energy | Topic: Forms of Energy
Read the summary notes first, then try these questions. Go back to the summary notes for this topic.
Part A has 20 tick-box questions. Part B has 5 essay questions with a marking guide at the bottom.
Test Yourself: 20 Objective Questions
Tick one answer for each question, then press Review answer. If your answer is wrong, it will be marked first, then the correct answer will show in green.
1. Energy is defined as the
2. The unit of energy is the
3. Energy stored in an object because of its position is called
4. A mango hanging on a tree has
5. The energy of a moving object is
6. Which of these has kinetic energy?
7. Water stored behind the Akosombo Dam has
8. The formula for gravitational potential energy is
9. The formula for kinetic energy is
10. A 2 kg stone is on a roof 5 m high. Taking g as 10 m/s², its potential energy is
11. A 4 kg ball moves at 3 m/s. Its kinetic energy is
12. When a ball falls from a table to the floor, its potential energy
13. Mechanical energy is the sum of
14. Energy stored in food, fuel and dry cells is
15. Which form of energy do we get from the Sun?
16. An electric iron changes electrical energy mainly into
17. A radio changes electrical energy mainly into
18. Which factor increases the potential energy of an object?
19. Which of these changes chemical energy into kinetic energy?
20. The kinetic energy of a moving car increases when its
Essay Questions
- (a) What is energy? (b) State the unit of energy. (c) List six forms of energy. (8 marks)
- Distinguish between potential energy and kinetic energy, giving one example of each. (6 marks)
- A boy of mass 40 kg climbs to the top of a platform 3 m high. Calculate his potential energy. (g = 10 m/s²) (4 marks)
- A trolley of mass 6 kg moves at 2 m/s. Calculate its kinetic energy. (4 marks)
- Match each gadget to the form of energy it mainly produces: electric kettle, bulb, loudspeaker, solar lantern. (4 marks)
Essay Questions: Marking Guide for Teachers and Parents
- (a) The ability to do work (2). (b) Joule (1). (c) Any six: potential, kinetic, heat, light, sound, electrical, chemical, solar, nuclear (1 mark each, total 5).
- Potential energy is energy stored in an object because of its position or condition, e.g. a mango on a tree (3). Kinetic energy is the energy of a moving object, e.g. a running boy (3).
- PE = mgh (1) = 40 × 10 × 3 (1) = 1200 (1) J (1).
- KE = ½mv² (1) = ½ × 6 × 2 × 2 (1) = 12 (1) J (1).
- Kettle: heat; bulb: light; loudspeaker: sound; solar lantern: light (accept electrical then light) (1 mark each).
Education Always (education.inspiringalways.com). Original practice questions, not official WAEC or BECE questions.