Available Answers

1. 1.

   Tick (√) the correct option:

   1. The S.I. unit of pressure
      1. Pascal
      2. Newton
      3. Newton/metre
      4. kg/m²
   2. The pull of the earth is a force called
      1. potential force
      2. gravity
      3. electrostatic force
      4. gravitational force
   3. The force per unit area is called
      1. pressure
      2. force
      3. weight
      4. acceleration
   4. An instrument is used to measure liquid pressure
      1. Barometer
      2. Manometer
      3. Ammeter
      4. Hydrometer
   5. Pressure of a liquid is
      1. same in all the direction at the same depth
      2. unequal in all the directions at the same depth
      3. dependent upon the shape and size of the container
      4. none of these
   6. Pressure is defined as
      1. force
      2. force x mass
      3. force x area
      4. force per unit area
   7. A force has
      1. magnitude only
      2. direction only
      3. both (a) and (b)
      4. none of these
   8. When a force is applied on a body, it may change its
      1. mass
      2. speed
      3. direction
      4. both speed and direction
   9. The S.I. unit of force is
      1. kg
      2. kg m
      3. kg m²
      4. Newton
   10. A spring balance is used to measure
       1. weight
       2. mass
       3. speed
       4. pressure
2. 2.

   Fill in the blanks:

   1. The _____________ or a _____________ acting on a body is commonly called force.
   2. A force can change the _____________ and _____________ of an object.
   3. Electric charges exert _____________ force, whereas magnets exert _____________ force.
   4. If the same force is made to act on a longer area, the pressure _____________.
   5. A _____________ is used to measure liquid pressure.
3. 3.

   Find the odd one out:

   1. Gravitational force, magnetic force, muscular force, electrostatic force
   2. Pressure, force, area, friction
4. 4.

   Tick (√) the correct and cross (x) the wrong statement:

   1. Pressure on solids increases with the increase in the area of cross-section.
   2. A moving object will come to rest irrespective of whether frictional force acts on it or not.
   3. Atmospheric pressure increases with height.
   4. When we lift a bucket of water, we use gravitational force.
   5. The pressure exerted by liquids increases with depth.
5. 5.

   Name the force that acts on all bodies on the earth at all times.

6. 6.

   Name a force that always opposes relative motion.