Available Answers

1. 1.

   Tick (√) the correct options:

   1. Which of the following is a translucent material?
      1. air
      2. tissue paper
      3. brick
      4. stone
   2. A dark space formed behind an opaque material is called _______________.
      1. Shadow
      2. image
      3. both of these
      4. none of these
2. 2.

   Tick (√) the correct options.

   1. Shadow of an object is always _______________.
      1. colourful
      2. white
      3. dark (black)
      4. transparent
   2. Pinhole camera is based on the _______________.
      1. rectilinear propagation of light
      2. rectangular propagation of light
      3. circular propagation of light
      4. none of these
3. 3.

   Tick (√) the correct options:

   1. The material through which we can see clearly is called _______________ material.
      1. opaque
      2. transparent
      3. translucent
      4. none of these
   2. Which of the following is a non-luminous body?
      1. star
      2. firefly
      3. lighted candle
      4. the earth
   3. We are able to see image in a mirror due to _______________.
      1. reflection
      2. dispersion
      3. refraction
      4. lateral inversion
   4. We cannot see the candle flame through the bent rubber tube because _______________.
      1. light does not reach us
      2. light reflects
      3. light moves zigzag
      4. none of these
   5. Which of the following is not a translucent object?
      1. grounded glass
      2. cellophane paper
      3. butter paper
      4. tissue Paper
   6. Which of the following is an opaque material?
      1. butter paper
      2. wood
      3. air
      4. water
4. 4.

   Match the following: 

   Column A	Column B
   1. Transparent	a. travels in straight line
   2. Translucent	b. air and glass
   3. Light	c. dark
   4. Shadow	d. butter paper and tissue paper

    

5. 5.

   Fill in the blanks.

   1. The sun is a _______________ source of light.
   2. A _______________ is a dark space formed behind an opaque object.
   3. A piece of glass is _______________ material.
   4. A shadow only shows the _______________ of an object.
   5. An opaque substance on which a shadow in formed is called a _______________.
6. 6.

   Name three luminous objects.