Available Answers

1. 1.

   Fill in the blanks with the correct words.

   1. Sun is a/an _____________ (natural/artificial) source of light.
   2. _____________ (clear glass/Butter paper) is a transparent material.
   3. Usually, light travels in a _____________ (straight/curved) path.
   4. Shadows are forrned when light rays are obstructed by _____________ (transparent/opaque) objects.
   5. A shadow only shows the _____________ (colour/shape) of the object.
   6. Size of the shadow _____________ (remains constant/may vary), depending on the distance between the object and screen.
   S A M P L E

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   Answer:

   S A M P L E

   1. natural
   2. clear glass
   3. straight
   4. opaque
   5. shape
   6. may vary
2. 2.

   Fill in the blanks with the correct words.

   1. A rough and bumpy surface is called a/an _____________ (regular/irregular) surface.
   2. Reflection from a _____________ (smooth/rough) surface is called diffused reflection.
   3. A good example of a smooth surface is a _____________ (mirror/unpolished wood).
   4. A/An _____________ (shadow/image) has the colour of the object.
   5. A _____________ (pinhole camera/mirror) is just a box with a very tiny hole on one of its sides.
   S A M P L E

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   Answer:

   S A M P L E

   1. irregular
   2. rough
   3. mirror
   4. image
   5. pinhole camera
3. 3.

   Give an example of a rough surface.

   S A M P L E

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   Answer:

   S A M P L E

   An example of a rough surface is sandpaper.

4. 4.

   What do you see when you stand in the front of a mirror?

5. 5.

   Give the term used to describe the left-right reversal of a reflected image.

6. 6.

   Choose the correct option.

   1. Which of the following is an example of a natural source of light?
      1. Candle light
      2. An electric bulb
      3. A computer screen
      4. A firefly
   2. Which of the following is an example of a translucent material?
      1. Clear glass
      2. Smoked glass
      3. Clean water
      4. Clean air
   3. Which of these will not form a shadow?
      1. A child
      2. Clear glass
      3. A tree
      4. A cloud
   4. The shadow of an object does not show
      1. the shape of the object
      2. the outline of the object
      3. the colour of the object
      4. none of these
   5. Which of these is not a part of a pinhole camera?
      1. Box
      2. Tiny hole
      3. Lens
      4. None of these