**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

Answer: b) Inertia.

**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.

Answer: a) Equal.

**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

Answer: (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

Answer: (c) 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

Answer: c) N 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

Answer: 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.

Answer: a) Always equal

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

Answer: b) 200 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

Answer: 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

Answer: b) 1323 N

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

Answer: d) 143.43

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

Answer: c) Nail

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

a) Barometer

b) Stethoscope

c) Weighing machine

d) None of these

Answer: 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

Answer: 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.

Answer: a) Greater than 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

Answer: c) Kepler’s second law

**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

Answer: 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

Answer: c) 126 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

Answer: b) 100 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

Answer: a) 800 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

Answer:

**In case you are missed :- Next Chapter MCQ Questions**