Available Answers

1. 1.

   Choose the correct option.

   1. What kind of object is a mirror?
      1. opaque
      2. transparent
      3. magnetic
      4. translucent
   2. The human eye functions like a
      1. transparent object
      2. reflecting surface
      3. pinhole camera
      4. opaque object
   3. Electrician wear thick rubber gloves as they work as
      1. conductors and conduct away the electric current from the electrician
      2. insulators and prevent the electric current from reaching the electrician
      3. a fuse and break the circuit to effectively stop flow of electric current
      4. they look nice and are comfortable to wear
   4. Lack of food in a region is called
      1. drought
      2. flood
      3. epidemic
      4. famine
   5. The process of collecting and storing rainwater from roofs or a surface catchment is called
      1. dam building
      2. drought prevention
      3. rainwater harvesting
      4. pollution reduction
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   Answer:

   S A M P L E

   1. (a) Opaque
   2. (c) Pinhole camera
   3. (b) insulators and prevent the e...
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   5. ...
2. 2.

   Write T for the true statement and F for the false one. Correct the false  statement(s).

   1. A shadow shows the colour f the object.
   2. Some cells can be used only once. Such cells are called primary cells.
   3. Electric current flows only if the circuit is open.
   4. Sun is a natural source of light.
   5. To conserve water we should use a wet cloth instead of a hose to wash the car.
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   Answer:

   S A M P L E

   1. F A shadow does not show the colour of the object; it appear...
   2. ...
   3. F Electric current flows only if...
   4. ...
   5. ...
3. 3.

   What is an transpiration?

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   Answer:

   S A M P L E

   Transpiration is the process by which plants lose extra wate...

4. 4.

   Why are handles of screwdrivers and testers made of wood or hard plastic?

5. 5.

   Describe two ways in which we can avoid wastage of water at home.

6. 6.

   In a pinhole camera, how does te size of the image change when we change the distance between the object and the pinhole?