ICSE Class 6 Physics - Light - Test 4 (Expert)
1. A coin kept under a table is not seen until a torch is switched on. This is because the coin:
A. Produces light only in darkness
B. Becomes visible when reflected light reaches the eyes
C. Changes into a luminous object
2. In a room, an electric lamp is glowing and a table is nearby. Which one is luminous?
A. Table
B. Both table and floor
C. Electric lamp
3. During a candle experiment, the flame is visible but the smoke is not a source of light. The flame is:
A. Luminous
B. Transparent
C. Opaque only
4. A straw is seen clearly through clean glass but not clearly through dirty glass. Dirty glass is closer to being:
A. Perfectly transparent
B. Translucent
C. A light source
5. A book is placed between a lamp and a white screen. A dark shadow forms because the book is:
A. Transparent
B. Luminous
C. Opaque
6. In an experiment with a torch and cardboard, a very small hole in the cardboard allows light to pass as a:
A. Narrow straight beam
B. Circular sound wave
C. Magnetic field
7. A student cannot see a candle through three cardboard holes after one sheet is shifted sideways. This happens because:
A. The candle stops giving light
B. The path of light is blocked
C. Light starts travelling in circles
8. A pencil is held very close to a torch and far from the wall. Its shadow on the wall will be:
A. Smaller than the pencil always
B. Invisible because pencils cannot form shadows
C. Larger than the pencil
9. For a clear shadow of a toy to form on a screen, the correct arrangement is:
A. Light source, toy, screen
B. Toy, light source, screen
C. Screen, light source, toy only
10. A shadow is not seen clearly when there is no wall or screen behind the object because:
A. The object becomes transparent
B. There is no surface to receive the shadow
C. The light source becomes opaque
11. Which set of words best describes the image in a plane mirror?
A. Real, upside down, smaller
B. Dark, opaque, heavy
C. Upright, virtual, laterally inverted
12. A toy is placed 15 cm in front of a plane mirror. Its image appears:
A. 15 cm behind the mirror
B. 30 cm in front of the mirror
C. On the toy itself
13. A person standing before a dressing mirror sees an image that is:
A. Upside down
B. Upright
C. Always smaller than the person
14. Which surface is most likely to form a clear image?
A. Rough wall
B. Crumpled paper
C. Polished mirror
15. A rough wooden board does not show your face clearly because reflected light is:
A. Scattered in different directions
B. Completely changed into sound
C. Always absorbed by air
16. In a simple periscope, light reaches the eye after reflection from:
A. One opaque wall only
B. Two plane mirrors
C. Two candles
17. A child uses a periscope to see over a high wall. This is possible because the periscope:
A. Makes the wall transparent
B. Produces its own sunlight
C. Changes the path of light by reflection
18. In a pinhole camera, making the hole very large usually makes the image:
A. Less sharp
B. Perfectly invisible
C. Always smaller and clearer
19. In a solar eclipse, the shadow on Earth is mainly caused by the:
A. Earth blocking moonlight
B. Moon blocking sunlight
C. Sun blocking starlight
20. When sunlight passes through raindrops and forms a rainbow, it shows that white light:
A. Has no colour at all
B. Is only black light
C. Contains different colours