PHYSICS

1. Nuclear sizes are expressed in a unit named

a. Fermi b. angstrom c. Newton d. tesla

2. What is the SI unit of the Planck’s constant?

a. watt second b. watt per second c. joule second d. joule per second

3. If the kinetic energy of a body is decreased by 36%, the percentage decrease in the linear momentum will be

a. 12% b. 20% c. 28% d. 36%

4. Choose the scalar quantity from the following

a. energy b. torque c. momentum d. force

5. The period of revolution of a geostationary satellite is

a. 12 hours b. 1 day c. 30 days d. 365 days

6. A person climbing a hill bends forward in order to

a. avoid slipping

b. increase speed

c. keep the centre of gravity of his body within his feet

d. keep the centre of gravity of his body outside his feet

7. The density of sea water increase as

a. depth and salinity increase

b. depth and salinity decrease

c. depth increases and salinity decreases

d. depth decreases and salinity increases

8. When a ship enters a sea from a river, it rises a little because

a. density of sea water is less than that of river water

b. sea is deeper than river

c. sea has more water than river

d. sea water being denser than river water, exerts a greater upthrust on the ship

9. The relative density of a liquids is measured by using an instrument called

a. altimeter b. hydrometer c. barometer d. galvanometer

10. A hydrogen – filled balloon rises in air because

a. the atmospheric pressure decreases with altitude

b. the acceleration due to gravity decreases with altitude

c. the density of air decreases with altitude

d. the buoyant force exerted by the air on the balloon is greater than the weight of the balloon