Question

I. Choose the correct answer:
1. A boat moves in water for a while and then comes to rest, when rowingis stopped. This is an example of
c) frictional force
d) magnetic force
a) gravitational force
b) electrostatic force
2. An elephant's feet do not sink on the ground because it
b) increases the pressure
a) reduces the
pressure
d) has no relation with pressure
c) decreases the area of contact
3. Walking with pointed heel shoes on soft ground, leave the depthof impression
c) too less
d) negligible
a) less
b) more
4. If area of contact is increased, then
b) pressure decreases
a) pressure increases
d) pressure increases up to some extent then decreases
c) pressure remains constant
5. The process of separating the various constituents of petroleum is called
c) refining
d) lubrication
a) ionization
b) carbonization
6. The natural resource, which is known as 'Black Gold' is
c) petroleum
d) coal tar
a) coal
b) natural gas
7. Coal is a fossil fuel and is formed by
c)combustion of plants
d) carbonization
a) oxidation
b) destructive distillation​

Answer 1

Explanation:

1. c
2. a
3. c
4. b
5. c
6. a
7. c

hope it helps you

Answer 2

Answer:

1) c-frictional force

2) a-reduces the pressure

3) d-more

4) b-pressure decreases

5) b-carbonization

6) c-petroleum

7) d-carbonization