Question

Tick (~) the most appropriate answer.
1. The force which opposes movement when two bodies are in contact with each other is called
(a) gravitational force (b) force of friction
(c) magnetic force (d) None of these
2. Which of the following are causes of friction?
(a) Deformation
(b) Adhesion
(c) Surface roughness (d) All of these
3. Which of the following is not true about friction?
(a) Friction produces heat
(b) Friction can stop the moving object
(c) Friction wears out rubbing surfaces
(d) Friction is always a disadvantage
4. Spring balance is used for measuring the
acting on an object.
(a) force
(b) mass
(c) pressure
(d) None of these
5. Two kinds of kinetic friction are
(a) static and rolling friction
(b) static and sliding friction
(c) rolling and sliding friction
(d) None of these
6. In which case is friction an evil?
(a) Writing
(b) Walking
(c) Driving
(d) Running a machine
7. Friction can be increased by
(a) making surfaces smooth
(b) using ball bearings
(c) making surfaces rough
(d) lubricating the surfaces
8. Friction can be reduced by
(a) making surfaces rough
(b) polishing the surfaces
(c) increasing mass of the moving object
(d) None of these
9. Factor(s) which determine(s) the amount of fluid friction is/are
(a) viscosity
(b) texture
(c) shape of body (d) All of these
10. It is tough to walk on a wet muddy track because
(a) force of friction is high (b) there is more resistance (c) force of friction is low (d) None of these​

Answer 1

Answer:

1. B) force of friction

2.D)all of these

3.D)friction is always a disadvantage

4.B)mass

5.A)

6.D)

7.C)

8.B)

9.A)

10.C)