PRACTICE EXERCISE
Multiple choice answers for class 8 science chapter force and pressure.
1. The CGS unit of force is
(a) Dyne
(b) Pascal
(c) Joule
(d) Watt
2. Force by the virtue of bodies in contact is called
(a) contact force
(b) non-contact force
(c) weak force
(d) strong force
3. If no force acts on a body, it will
(a) shape gets deformed
(b) move fastly
(c) either in rest or in motion
(d) stop moving
4. When we apply a force of 1 N, we can hold a body whose mass is approximately equal to
(a) 100 mg
(b) 100 g
(c) 1 kg
(d) 10 kg
5. A force of a given magnitude acts on a body. The acceleration of the body depends on the
(a) mass
(b) volume
(c) density
(d) shape
6. Kicking ball with our legs is an example of force of
(a) friction
(b) gravitation
(c) muscular
(d) magnetic
7. The action-reaction forces
(a) act on same body
(b) act on different body
(c) act long different lines
(d) act in same direction
8. Friction force between two rough surfaces can be .............. by using lubricant
(a) increased
(b) decreased
(c) removed
(d) kept same
9. Consider a porter standing on a platform with a suitcase which presses his head with a force of 300 N. The reaction forces is exerted by
(a) the head on the suitcase
(b) the earth on the suitcase
(c) the earth on the porter
(d) the suitcase on the earth
10. Sometimes, car skids on rainy season
(a) water increases the friction between the road and the tyres
(b) it is not possible to apply brakes on a wet road
(c) the friction between the brake shoes and the wheels is reduced
(d) water reduces friction between the road and the tyres
ANSWERS
1 c
2 a
3 c
4 c
5 a
6 c
7 b
8 b
9 a
10 d
THANK YOU
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