Level: JHS, Basic 7 | Subject: Integrated Science | Strand: Forces and Energy | Topic: Light
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. An object that makes its own light is described as
2. Which of these is a luminous object?
3. We can see the Moon because it
4. Light travels in
5. We see lightning before we hear thunder because
6. A shadow is formed when light
7. Which of these is a transparent material?
8. A material that lets only part of the light pass through is
9. Which of these is an opaque material?
10. The bouncing back of light from a surface is called
11. According to the law of reflection, the angle of incidence is
12. The image in a plane mirror is
13. The bending of light as it passes from one medium to another is
14. A pencil in a glass of water looks bent because of
15. The splitting of white light into its colours is called
16. The number of colours in the spectrum of white light is
17. Which colour is at the top of the rainbow spectrum (the red end)?
18. A rainbow is formed when
19. A glass prism is used to
20. Which instrument uses reflection to see over a wall?
Essay Questions
- (a) Distinguish between luminous and non-luminous objects, giving two examples of each. (b) Why can we see the Moon? (6 marks)
- Describe a simple experiment to show that light travels in straight lines. (5 marks)
- Distinguish between transparent, translucent and opaque materials. Give one example of each. (6 marks)
- State the law of reflection and give three characteristics of an image formed by a plane mirror. (5 marks)
- (a) What is dispersion of light? (b) List the seven colours of the spectrum in order. (c) Name one natural example of dispersion. (3 marks)
Essay Questions: Marking Guide for Teachers and Parents
- Luminous objects produce their own light, e.g. the Sun, a candle (2). Non-luminous objects do not make light, e.g. the Moon, a book (2). We see the Moon because it reflects light from the Sun (2).
- Take three cards with holes in the centre (1). Place them in a line with a candle behind them (1). Look through the holes (1). The flame is seen only when the holes are in a straight line (1). Moving one card stops the light, showing it travels in straight lines (1).
- Transparent allows all light to pass, e.g. clear glass (2). Translucent allows part of the light, e.g. frosted glass (2). Opaque allows no light, e.g. wood (2).
- The angle of incidence equals the angle of reflection (2). Any three: same size, upright, same distance behind the mirror, laterally inverted (1 mark each).
- (a) The splitting of white light into its colours (1). (b) Red, orange, yellow, green, blue, indigo, violet (1 for correct order; accept 6 or 7 correct). (c) Rainbow (1).
Education Always (education.inspiringalways.com). Original practice questions, not official WAEC or BECE questions.