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Primary 5 Science Light Quiz
Free P5 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 5 Science Quiz - Light: Answer Scheme
Answer 1.
B. The Sun [2]
Answer 2.
B. Light from the lamp bounces off the book into her eyes. [2]
Answer 3.
B. In straight lines. [2]
Answer 4.
B. Reflects light from the Sun. [2]
Answer 5.
C. Cardboard — it is opaque, blocking all light to give the darkest, sharpest shadow. [2]
Answer 6.
(a) Source [1] (b) Reflects [1] (c) Source [1]
Answer 7.
We see an object only when light from it enters our eyes. In a completely dark room there is no light, and the book does not give out its own light, so no light from the book can enter the reader's eyes. [3]
Answer 8.
Light travels in straight lines. The opaque object blocks the light rays that hit it, while rays travelling beside the object continue straight on. The blocked region copies the outline of the object, so the shadow has the same shape. [3]
Answer 9.
(a) Energy [1] (b) Eyes [1] (c) Blocked [1]
Answer 10.
Similarity: We see both because light from them enters our eyes. [1] Difference: The Sun gives out its own light (a light source); the Moon does not — it only reflects sunlight. [2]
Answer 11.
(a) The shadow becomes bigger. [1] (b) Light travels in straight lines outward from the torch. When the torch is closer, the light rays spread out more widely before reaching the ball, so more rays are blocked around the edges of the ball. The blocked area projected onto the screen is therefore larger. [3]
Answer 12.
(a) Draw the reflected ray leaving the point of contact on the upper-right side, making 40° with the normal, symmetrical to the incident ray, with an arrowhead pointing away from the mirror. [2] (b) 40° [1] (c) The angle of incidence equals the angle of reflection. [1]
Answer 13.
Light from the boat travels in a straight line into the top opening of the periscope. It strikes mirror M1, tilted at 45°, and bounces off at 90° so it travels straight down the tube. At mirror M2, also at 45°, it bounces another 90° and travels in a straight line into the person's eye. The two reflections bend the light path twice without scattering, letting the person see the boat above. [4]
Answer 14.
(a) Sheet P: transparent [1]; Sheet Q: translucent [1]; Sheet R: opaque [1] (b) Sheet P, because a windscreen must be transparent so almost all light passes through and the driver can see clearly through it. [1]
Answer 15.
(a) The image is upside down (inverted) and shows the same shape as the flame. [2] (b) Light travels in straight lines. Rays from the top of the flame pass through the small hole in a straight line to the bottom of the tracing paper, and rays from the bottom pass to the top, so the image forms inverted. [2]
Answer 16.
(a) Noon [1] (b) The Sun appears to move across the sky, so its position changes. Light travels in straight lines from the Sun to the pole. When the Sun is low (morning/evening), the rays strike the pole at a slant and the blocked light stretches far along the ground, giving a long shadow. When the Sun is high at noon, the rays come almost straight down, so the blocked region on the ground is very short. [4]
Answer 17.
Light from the letters travels in straight lines to the car's mirror and reflects into the driver's eyes. A plane mirror reverses the image left-to-right. Because "AMBULANCE" is printed back-to-front, the mirror flips it back so the driver reads the correct word "AMBULANCE" quickly and gives way. [5]
Answer 18.
Luminous: the Sun, a firefly, a lighted candle [2] Non-luminous: a mirror, the Moon, a book [2] Non-luminous objects can only be seen when they reflect light from a light source into our eyes. [1]
Answer 19.
(a) It shows that light travels in straight lines. [2] (b) Light from the candle passes through the holes only when all three holes are in a straight line. Moving the middle card puts its hole out of alignment, so the straight-line path of light is blocked by the card and no light reaches Jun Jie's eye. [3]
Answer 20.
Light from the Sun travels in straight lines towards the Earth. When the Moon comes between them, it is opaque and blocks the sunlight, casting its shadow onto part of the Earth. People inside the Moon's shadow cannot receive direct sunlight, so that part of the Earth becomes dark — a solar eclipse. [5]
— End of Answer Scheme —