14. Light and the Formation of Shadows| General Science | Class 6

1. Choose an appropriate word and fill in the blanks.

(a) A ……….. is a natural source of light.

ANSWER: star

(b) A ……… is an artificial source of light.

ANSWER: candle

(c) When light passes through a prism, it gets separated into ……. colours.

ANSWER: seven

(d) The image obtained in the pinhole camera is ……… .

ANSWER: inverted

(e) A shadow is formed when an ……….. object comes in the way of light.

ANSWER: opaque

(f) When a ……….. object comes in the way of light, light passes ……… it.

ANSWER: transparent, through

Options :  (seven, star, through, transparent, opaque, colors, shape, erect, inverted, luminous, candle)

2. Write whether of the following objects are luminous or non-luminous.

Object	Luminous/ Non-luminous
A book
A burning candle
A wax cloth
A pencil
A pen
A light bulb
A tyre
A torch

ANSWER:

Object	Luminous/ Non-luminous
A book	Non-luminous
A burning candle	Luminous
A wax cloth	Non-luminous
A pencil	Non-luminous
A pen	Non-luminous
A light bulb	Luminous
A tyre	Non-luminous
A torch	Luminous

3. Match the following.

Group A	Group B
(a) Mirror	(1) Non-luminous
(b) Firefly	(2) Inverted image
(c) Pinhole camera	(3) Reflection
(d) Moon	(4) Luminous

ANSWER:

Group A	Group B
(a) Mirror	(3) Reflection
(b) Firefly	(4) Luminous
(c) Pinhole camera	(2) Inverted image
(d) Moon	(1) Non-luminous

4. Write the answers to the following.

(a) What things are necessary for the formation of a shadow ?

ANSWER: Three things are necessary for the formation of shadow:

1. a source of light
2. an object
3. a screen, on which the shadow will be formed

(b) When can an object be seen ?

ANSWER: We see the object when the reflected rays of light from the object reach our eyes.

(c) What is a shadow ?

ANSWER: If an opaque object comes in the way of a light source, light does not pass through it. As a result, the light does not reach a wall or any other surface on the other side of the object and that part remains dark. This dark part is called the ‘shadow of the object’.

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Also view: Chapter 15: FUN WITH MAGNETS | General Science | Class 6