Available Answers

1. 1.

   What happens when an acid reacts with a base?
2. 2.

   Mention three uses of plastics.
3. 3.

   Mention three disadvantages of synthetic fibres.
4. 4.

   How is work done measured?
5. 5.

   What is jet propulsion?
6. 6.

   Choose the correct option.

   1. Vinegar and lemon juice are
      1. acidic 
      2. basic
      3. neither acidic nor basic
   2. Antacids are 
      1. acidic 
      2. basic
      3. neither acidic nor basic
   3. A pulley helps us by
      1. letting us use a smaller force
      2. helping us gain distance
      3. changing the direction of force
   4. A weighing balance is a
      1. pulley
      2. lever
      3. wheel-and-axle arrangement
   5. The coil of wire in a bulb is called a
      1. filament
      2. element
      3. fuse