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Primary 4 Science Light Quiz
Free P4 Science Light quiz, Ox AI version, with questions, answers, and syllabus-aligned practice for Singapore students.
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Questions
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Answers
Primary 4 Science Quiz - Light: Answer Key
Answer 1.
C — A torch gives out its own light. The Moon, mirror and shirt only reflect light.
Answer 2.
B — We see objects that do not give out light when they reflect light into our eyes.
Answer 3.
A — A straight bright beam across a dark room shows light travelling in straight lines.
Answer 4.
B — The wooden block is opaque and blocks the light completely, so a shadow forms.
Answer 5.
B — Moving the torch closer to the ball makes the shadow bigger.
Answer 6.
(a) reflects (b) source
Answer 7.
(a) False — light travels in straight lines. (b) True. (c) True — a firefly gives out its own light.
Answer 8.
| Object | Source of light | Reflects light |
|---|---|---|
| The Sun | ✓ | |
| A mirror | ✓ | |
| A candle flame | ✓ | |
| A storybook | ✓ |
Answer 9.
(a) Y (b) When the Sun is higher in the sky (Position Y), its rays strike the tree more steeply, so the shadow formed is shorter.
Answer 10.
Change: the distance between the torch and the toy robot. Keep the same: the same torch (same brightness). Keep the same: the distance between the robot and the screen (position of the screen).
Answer 11.
(a) A dark circle about the size of the ball, drawn on the screen directly behind the ball and labelled "shadow". (b) The ball blocks the light from the torch. Light travels in straight lines, so it cannot bend around the ball. The part of the screen behind the ball receives no light and appears dark — this is the shadow.
Answer 12.
Light travels in straight lines. Only the light striking the front face of the cube is blocked, and that face is square. The blocked light covers exactly that square area, so the shadow on the wall has the same square shape as the face of the box.
Answer 13.
A star-shaped shadow. The cardboard star blocks the lamp's light, and a shadow always takes the shape of the object blocking the light.
Answer 14.
Sheet P forms a dark, complete shadow because it blocks all the light from reaching the screen. Sheet Q forms a lighter, partial shadow because some light passes through it and reaches the screen.
Answer 15.
The storeroom was dark, so no light fell on the bicycle. The bicycle does not give out its own light, so there was no light reflecting off it into Dan's eyes, and he could not see it.
Answer 16.
It shows that light travels in straight lines. When the three cards are in a straight line, the light passes through all three holes in a straight path to Kumar's eye. When Card 2 moves, it blocks the straight path of the light, so Kumar can no longer see the light.
Answer 17.
The Sun's position in the sky changes during the day. A shadow always points away from the Sun. As the Sun moves from east in the morning to west in the late afternoon, the direction of the flagpole's shadow changes too.
Answer 18.
(i) The distance between the torch and the toy elephant. (ii) The size (height or length) of the shadow on the screen. (iii) Any two: the same torch (same brightness); the distance between the toy elephant and the screen; the same toy elephant. (iv) The shadow becomes smaller.
Answer 19.
The puppets block the lamp's light. The cloth appears bright where the lamp's light shines on it, but dark behind each puppet where the light is blocked. The audience therefore sees dark puppet shapes on the cloth.
Answer 20.
Two shadows. Each lamp's light is blocked by the ball, so each lamp forms its own shadow on the screen on the side facing away from that lamp. (1 mark for "two"; 2 marks for explaining that each lamp is blocked separately.)