#### Laws of Motion English Medium Free Online Test 1 Mark Questions with Answer Key 2020 - 2021

10th Standard

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Science

Time : 00:15:00 Hrs
Total Marks : 15

Part A

15 x 1 = 15
1. Impulse is equals to

(a)

rate of change of momentum

(b)

rate of force and time

(c)

change of momentum

(d)

rate of change of mass

2. In which of the following sport the turning of effect of force used

(a)

swimming

(b)

tennis

(c)

cycling

(d)

hockey

3. The mass of a body is measured on planet Earth as M kg. When it is taken to a planet of radius half that of the Earth then its value will be____kg

(a)

4 M

(b)

2 M

(c)

M/4

(d)

M

4. To project the rockets which of the following principle(s) is /(are) required?

(a)

Newton’s third law of motion

(b)

Newton’s law of gravitation

(c)

law of conservation of linear momentum

(d)

both a and c

5. ______ deals with the bodies which are at rest under the action of forces.

(a)

Statics

(b)

Kinematics

(c)

Dynamics

(d)

Mechanics

6. The resistance of a body to change its state of rest is called

(a)

inertia of rest

(b)

inertia of motion

(c)

momentum

(d)

inertia of direction

7. The resistance of a body to change its state of motion is called

(a)

force

(b)

momentum

(c)

inertia of motion

(d)

inertia of direction

8. The sparks produced during sharpening a knife against a grinding wheel leaves the rim of the wheel tangentially. This is due to

(a)

inertia of rest

(b)

inertia of motion

(c)

inertia of direction

(d)

force applied

9. ________ is an example for non - contact force.

(a)

magnetic

(b)

frictional

(c)

rolling ball

(d)

none

10. A force of 20N is acting on an object of mass 10 kg. The acceleration produced is

(a)

1 ms-2

(b)

2 ms-2

(c)

20 ms-2

(d)

10 ms-2

11. A water tanker filled up to $\frac{2}{3}$ of its height is moving with a uniform speed, on sudden application of the brake, the water in the tank would

(a)

move backward

(b)

be unaffected

(c)

rise upwards

(d)

move forward

12. The ball is thrown up, the value of g will be

(a)

zero

(b)

+ve

(c)

-ve

(d)

negligible

13. If the radius of the earth were to shrink by one percent its mass remaining the same, the acceleration due to gravity on the earth's surface would

(a)

decrease unchanged

(b)

r e m a i n s

(c)

increase

(d)

none of these

14. The motion of falling bodies towards earth is due to

(a)

gravitational rotation

(b)

weightless mass

(c)

acceleration due to gravity

(d)

gravitational force

15. Cutting tools have sharp edges to

(a)

increase area of contact

(b)

decrease pressure

(c)

decreases area and increase pressure

(d)

increase area & increase pressure