Practice

Light: Shadows and Reflections — Practice

15 questions 15 min Recall + understand

Q1. Objects that emit their own light are called
- A. luminous objects.
- B. non-luminous objects.
- C. opaque objects.
- D. transparent objects.
Q2. The Moon is considered a non-luminous object because it
- A. is smaller than the Sun.
- B. reflects the light of the Sun and does not emit its own.
- C. appears only at night.
- D. is made of rock and dust.
Q3. Which set lists only natural sources of light?
- A. Sun, candle, torch, firefly.
- B. Sun, LED bulb, lantern, lightning.
- C. Sun, stars, lightning, firefly.
- D. Tube light, torch, Sun, stars.
Q4. According to the Science and Society box, LED lamps are promoted in India mainly because they
- A. give blue light only.
- B. are cheaper to manufacture than candles.
- C. do not need electricity.
- D. consume much less power and last longer.
Q5. The activities with three matchbox holes and the bent pipe are used to show that
- A. light is reflected by mirrors.
- B. light travels in a straight line.
- C. shadows are always black.
- D. the Moon shines by its own light.
Q6. Materials through which light passes almost completely are called
- A. transparent materials.
- B. translucent materials.
- C. opaque materials.
- D. luminous materials.
Q7. Tracing paper is best described as a
- A. transparent material.
- B. luminous material.
- C. translucent material.
- D. opaque material.
Q8. An opaque material is one through which
- A. light passes completely.
- B. light passes partially.
- C. light emits on its own.
- D. light does not pass at all.
Q9. A shadow is
- A. the dark patch formed where light does not reach because an object blocks it.
- B. the bright spot of light formed on a wall.
- C. the image of an object formed in a mirror.
- D. the colour reflected by an opaque object.
Q10. To observe a shadow we need
- A. a mirror, a screen and a transparent object.
- B. a source of light, an opaque object and a screen.
- C. a torch and a clean glass plate only.
- D. a luminous object and a translucent material only.
Q11. The change in the direction of light by a mirror is called
- A. absorption of light.
- B. refraction of light.
- C. reflection of light.
- D. scattering of light.
Q12. The image of a pen formed by a plane mirror is
- A. smaller than the pen.
- B. larger than the pen.
- C. of a different shape.
- D. of the same size as the pen.
Q13. The perceived left-right reversal in the image formed by a plane mirror is called
- A. lateral inversion.
- B. vertical inversion.
- C. magnification.
- D. refraction.
Q14. The image of a candle flame formed by a simple pinhole camera on the screen is
- A. erect and of the same size.
- B. erect and magnified.
- C. inverted (upside down).
- D. laterally inverted only.
Q15. A simple periscope is made by placing
- A. one concave mirror in a tube.
- B. two plane mirrors in a Z-shaped box.
- C. three plane mirrors in a triangle.
- D. a pinhole between two screens.

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