Available Answers

1. 1.

   Choose the correct answer (MCQs)

   1.  Wood is a ________________ material.
      1. Transparent
      2. Opaque 
      3. Translucent
      4. None of these

   2.  Animals depend on plants for:
      1. Food
      2. Oxygen 
      3. Shelter
      4. All of these

   3.  A screw is very similar in function to a:
      1. Lever
      2. Pulley 
      3. Inclined plane
      4. Wheel and axle

   4. Which of these are warning sounds?
      1. Sound of music
      2. Siren of an ambulance 
      3. Fire alarm
      4. Both (a) and (b)

   5.  Which of these uses energy from the sun?
      1. Plants
      2. Solar heater 
      3. Solar cell
      4. All of these

   6. Which of these should you do to be healthy?
      1. Keep clean
      2. Eat a variety of food 
      3. Exercise
      4. All of these
2. 2.

   Fill in the blanks.

   1. A solar panel is used to convert sunlight into ___________.
   2. The bouncing off of light by objects is called __________ of light.
   3. _________ are used in cranes to lift heavy loads.
   4. _________ are very small, harmful living things.
   5. A forest ________ upsets the balance of nature in the particular region.
3. 3.

   What is global warming? How can it affect the environment?

4. 4.

   What is noise pollution? List three methods of reducing noise pollution around us.

5. 5.

   Why is the sun so important for us?

6. 6.

   Distinguish between transparent and translucent objects. Give two examples of each.