Objective questions- Light and Shadow

Test yourself

A. Short Answer Questions

1. Write true or false for each statement

(a) The moon is a natural source of light.
Answer. False

(b) The moon is self luminous.
Answer. False

(c) We can see an object through an opaque medium.
Answer. False

(d) Light passes through glass.
Answer. True

(e) Light travels in a straight line path. .
Answer. True

(f) Image formed in a pin hole camera is real.
Answer. True

(g) The image in a pin hole camera gets blurred if the hole is made bigger.
Answer. True

(h) A shadow is formed because light travels in a straight line path.
Answer. True

(i) Solar eclipse occurs when the sun comes in between the earth and the moon.
Answer. False

(j) If the shadow of earth falls on the moon, the eclipse is called the lunar eclipse.
Answer. True

2. Fill in the blanks

(a) Light gives us the sensation of vision.
(b) The sun is a natural source of light.
(c) A medium through which light cannot pass is called the opaque medium.
(d) A medium which allows light to pass through it easily is called the transparent medium.
(e) Moon is a non-luminous body.
(f) Light travels in a straight line path.
(g) In a pin hole camera, the image formed is inverted and real.
(h) The darkest portion of a shadow is called the umbra.
(i) The less dark portion of a shadow is called the penumbra.
(j) Lunar eclipse occurs when the earth comes in between the moon and the sun.

3. Match the following columns

Select the correct alternative

(i) The natural source of light is

1. candle flame
2. electric lamp
3. sun
4. kerosene lamp

(ii) The formation of inverted image in a pin hole camera shows that

1. light enables us to see
2. light travels in a straight line path
3. light can pass through the pin hole
4. light does not pass through the pin hole

(iii) The luminous body is

1. a lighted bulb
2. earth
3. noon
4. table

(iv) Umbra is a region of

1. complete darkness
2. partial darkness
3. complete brightness
4. partial brightness

(v) Penumbra is a region of

1. complete darkness
2. complete brightness
3. partial brightness
4. none of the above

(vi) Solar eclipse occurs on

1. every new moon’s day
2. certain new moon’s day
3. every full moon’s day
4. certain full moon’s day

(vii) Lunar eclipse occurs on

1. every full moon’s night
2. certain full moon’s night
3. every new moon’s day
4. certain new moon’s day