# Gravitation MCQ Questions Class 9 Science Chapter 10

Gravitation MCQ Questions Class 9 Science Chapter 10

NCERT MCQ Questions for Class 9 Science Chapter 10 Gravitation. Gravitation MCQ Questions with Answers from Class 9 Science.

## Gravitation MCQ Questions Class 9 Science Chapter 10

Gravitation Multiple Choice Questions with Answers Class 9 Science Chapter 10 PDF is available.

1.) The first law of motion introduced the concept of-

a) Momentum

b) Inertia

c) Action and reactions

d) Kinetic energy

2.) According to first law of motion, the states of uniform motion and rest are ……

a) Equal

b) Unequal

c) Non related

d) None of these.

3.) Force is a physical quantity depends on

a) Speed

b) Mass

c) Acceleration

d) Both b and c

Answer: d) Both b and c.

Hint- Second law of motion.

4.) If a particles of mass 8 kg is moving with constant velocity of 20 m/s then net force on that object will be.

a) 160 N

b) 20 N

c) 80 N

d) 0 N

The object is moving with constant velocity so net force must be zero.

5.) If a ball of mass 200 gm is moving with 20 m/s then its momentum is

a) 40 kg m/s

b) 400 kg m/s

c) 4 Kg m/s

d) 0.4 kg m/s

Mass = 200 gm = 0.2 kg, velocity = 20 m/s.

As

Momentum = 0.2 × 20

Momentum = 4 kg m/s.

6.) The SI unit of g is

a) N m/kg

b) N m²/kg

c) N m² /kg²

d) N² m² / kg²

7.) If a ball has mass 60 kg on earth then it’s mass on moon will be…

a) 10 kg

b) 40 kg

c) 0 kg

d) 60 kg

Mass does not changes with position.

8.) The value of acceleration due to gravity on pole of earth is.

a) 9.8 m/s²

b) Greater than 9.8 m/s²

c) Less than 9.8 m/s²

d) 0 m/s²

e) Answer: b) Greater than 9.8 m/s²

9.) Magnitude of force in action and reaction is

a) Always equal

b) Always unequal

c) May be equal or unequal.

d) Depend on time of reaction.

Hint – Third law of motion.

10.) If the mass of object is 20 kg then it’s weight on south pole will be…

a) 20 N

b) 200 N

c) 196 N

d) 980 N

Given, mass = 20 kg, we know the value of acceleration due to gravity on pole,

g on pole = 10 m/s².

As,

Weight = mass × acceleration due to gravity

Weight = 20 × 10

Weight = 200 N.

11.) The ratio of acceleration due to gravity on earth to the acceleration due to gravity on moon is

a) 1/10

b) 10/1

c) 1/6

d) 6/1

12.) The mass of the object is 135 kg then its weight on earth will be

a) 135 N

b) 1323 N

c) 1224 N

d) 1413

Given, Mass = 135 kg,

We know, Acceleration due to gravity on earth = 9.8 m/s²,

According to second law of motion,

Weight = mg

Weight = 135 × 9.8

Weight = 1323 N.

In case you are missed :- Previous Chapter MCQ Questions

13.) The mass of object is 88 kg then its weight on moon will be,

a) 862.4

b) 148.34

c) 132.33

d) 143.44

Given, Mass = 88 kg,

We know, Acceleration due to gravity on moon = 1.63 m/s²,

According to second law of motion,

Weight = mg

Weight = 88 × 1.63

Weight = 143.44

14.) Which of the following does sink into water?

a) Empty plastic bottle

b) Wooden block

c) Nail

d) Rubber band

15.) Which of the following is based on Archimedes principle?

a) Barometer

b) Stethoscope

c) Weighing machine

d) None of these

16.) The SI unit of relative density is

a) Kg/m

b) Kg/m²

c) Kg/m³

d) Unit less quantity

17.) The density of gold is

a) Greater than density of water

b) Less than density of water.

c) Equal to density of water

d) Equal to or less than density of water.

18.) Newton’s law of gravitation is based on

a) Kepler’s first law

b) Kepler’s second law

c) Kepler’s third law

d) Archimedes principle

19.) If the distance between two objects is increased by 7 times then the force of attraction will be

a) Increases by 7 time

b) Decreases by 7 time

c) Increases by 49 times

d) Decreases by 49 times.

Answer: d) Decreases by 6 times

Hint- Gravitational force is inversely proportional to square of distance.

20.) If a man of mass 80 kg is in interstellar space (zero gravity) then its weight will be

a) 800 N

b) 80 N

c) 130.64 N

d) Zero N

21.) If the weight of object on moon is 21 N then its weight on earth will be

a) 21 N

b) 63 N

c) 126 N

d) 0 N

The weight of object on earth will be 6 times greater than weight on moon.

22.) The weight of the object is depend on

a) Mass

b) Acceleration due to gravity

c) Both a and b

d) None of these

Answer: c) Both a and b

23.) Hammer exerts 20 N force on the wall. If the area of hammer is 0.2 m² then calculate pressure exerted by hammer on wall.

a) 50 N/m²

b) 100 N/m²

c) 100 N/m²

d) 2000 N/m²

Given, Force = 20 N,

Area = 0.2 m²

As we know,

Pressure = force/area

Pressure = 20/0.2

Pressure = 100 N/m²

24.) If the relative density of a substance is 0.8 then Calculate the density of substance.

a) 800 Kg/m³

b) 900 Kg/m³

c) 1100 Kg/m³

d) 1200 Kg/m³

Given, relative density = 0.8,

As we know density of water = 1000 kg/m².

As,

Relative density = density of substance/density of water

Density of substance = relative density × density of water

Density of substance = 0.8 × 1000

Density of substance = 800 Kg/m³.

25.) Density of the substance is inversely proportional to —– of the substance.

a) Length

b) Area

c) Volume

d) Density