Extra 40 Multiple Choice Questions (MCQs) with answers from Chapter: Gravitation (Class 9 CBSE Science).
1. Who discovered the universal law of gravitation?
a) Albert Einstein
b) Isaac Newton
c) Galileo Galilei
d) Johannes Kepler
Answer: b) Isaac Newton
2. The value of acceleration due to gravity (g) on Earth is approximately:
a) 8.9 m/s²
b) 9.8 m/s²
c) 10.8 m/s²
d) 12.6 m/s²
Answer: b) 9.8 m/s²
3. The force of gravitation between two objects depends on:
a) Their masses and distance between them
b) Their shape and volume
c) Their temperature
d) Their speed
Answer: a) Their masses and distance between them
4. The force of attraction between two masses is called:
a) Magnetic force
b) Electrostatic force
c) Gravitational force
d) Nuclear force
Answer: c) Gravitational force
5. If the mass of one object is doubled, the gravitational force between two objects will:
a) Remain the same
b) Double
c) Reduce to half
d) Become four times
Answer: b) Double
6. The SI unit of gravitational force is:
a) Newton
b) Joule
c) Watt
d) Pascal
Answer: a) Newton
7. What happens to the gravitational force between two objects when the distance between them is doubled?
a) Increases four times
b) Decreases four times
c) Remains unchanged
d) Doubles
Answer: b) Decreases four times
8. The weight of an object is the force with which:
a) It is attracted towards the Earth
b) It is repelled from the Earth
c) It moves in space
d) None of the above
Answer: a) It is attracted towards the Earth
9. The SI unit of weight is:
a) Kilogram
b) Newton
c) Joule
d) Gram
Answer: b) Newton
10. The acceleration due to gravity is highest on:
a) Earth
b) Moon
c) Mars
d) Jupiter
Answer: d) Jupiter
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11. If an object is taken to the Moon, its mass will:
a) Increase
b) Decrease
c) Remain the same
d) Become zero
Answer: c) Remain the same
12. If an object is taken to the Moon, its weight will:
a) Increase
b) Decrease
c) Remain the same
d) Double
Answer: b) Decrease
13. The acceleration due to gravity on the Moon is:
a) Same as Earth
b) 1/6th of Earth’s gravity
c) Twice that of Earth
d) Zero
Answer: b) 1/6th of Earth’s gravity
14. Which planet has the strongest gravitational pull?
a) Mars
b) Earth
c) Jupiter
d) Venus
Answer: c) Jupiter
15. What is the formula for gravitational force?
a)
b)
c)
d)
Answer: b)
16. The value of universal gravitational constant (G) is:
a) m/s²
b) Nm²/kg²
c) Nm²/kg²
d) Nm²/kg²
Answer: b) Nm²/kg²
17. The weight of an object depends on:
a) Mass of the object
b) Acceleration due to gravity
c) Both a and b
d) Shape of the object
Answer: c) Both a and b
18. The value of ‘g’ decreases:
a) As we go above the Earth’s surface
b) As we go deep into the Earth
c) As we move to higher altitudes
d) All of the above
Answer: d) All of the above
19. The weight of an object on the Moon is:
a) 1/6th of its weight on Earth
b) 1/3rd of its weight on Earth
c) Twice its weight on Earth
d) Same as on Earth
Answer: a) 1/6th of its weight on Earth
20. If the Earth shrinks without a change in its mass, the value of 'g' will:
a) Increase
b) Decrease
c) Remain the same
d) Become zero
Answer: a) Increase
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21. The motion of a freely falling object is an example of:
a) Uniform motion
b) Uniformly accelerated motion
c) Circular motion
d) Constant velocity motion
Answer: b) Uniformly accelerated motion
22. The force which keeps planets in their orbits is:
a) Centripetal force
b) Magnetic force
c) Electrostatic force
d) Nuclear force
Answer: a) Centripetal force
23. The mass of an object is:
a) Constant everywhere
b) Variable
c) Zero in space
d) None of these
Answer: a) Constant everywhere
24. The value of ‘g’ is maximum at:
a) Poles
b) Equator
c) Inside the Earth
d) Above the surface
Answer: a) Poles
25. The force with which the Earth pulls an object towards itself is called:
a) Weight
b) Mass
c) Density
d) Pressure
Answer: a) Weight
26. The value of ‘G’ is:
a) Same everywhere
b) Varies from place to place
c) Zero at the center of Earth
d) Maximum at the center of Earth
Answer: a) Same everywhere
27. The weight of an object is measured using:
a) Spring balance
b) Beam balance
c) Measuring scale
d) Barometer
Answer: a) Spring balance
28. What happens to the speed of an object in free fall?
a) Increases
b) Decreases
c) Remains the same
d) First increases, then decreases
Answer: a) Increases
29. If an object is thrown upwards, it will fall back due to:
a) Air resistance
b) Gravity
c) Magnetic force
d) Centripetal force
Answer: b) Gravity
30. The gravitational force between two objects is maximum when:
a) The objects are closer
b) The objects are far apart
c) One object is large
d) One object is small
Answer: a) The objects are closer
31. What is the shape of the path followed by a projectile under gravity?
a) Circular
b) Straight line
c) Parabolic
d) Elliptical
Answer: c) Parabolic
32. The weight of an object on Earth is due to:
a) Magnetic force
b) Gravitational force
c) Nuclear force
d) Electrostatic force
Answer: b) Gravitational force
33. The value of acceleration due to gravity is zero at:
a) The Earth's poles
b) The Earth's equator
c) The center of the Earth
d) The surface of the Earth
Answer: c) The center of the Earth
34. The force of gravity is weakest on which planet?
a) Mercury
b) Mars
c) Venus
d) Pluto
Answer: d) Pluto
35. The gravitational force is always:
a) Attractive
b) Repulsive
c) Both attractive and repulsive
d) Zero
Answer: a) Attractive
36. If the mass of an object is m and acceleration due to gravity is g, then its weight is:
a) W = mg
b) W = m/g
c) W = g/m
d) W = g x g
Answer: a) W = mg
37. The weight of an object in a satellite orbiting Earth is:
a) Zero
b) Same as on Earth
c) Half of that on Earth
d) More than on Earth
Answer: a) Zero
38. The unit of acceleration due to gravity (g) is:
a) m/s²
b) Newton
c) Joule
d) kg/m³
Answer: a) m/s²
39. If a feather and a stone are dropped in a vacuum, they will:
a) Fall at the same speed
b) Feather will fall faster
c) Stone will fall faster
d) Both will stop moving
Answer: a) Fall at the same speed
40. The gravitational force is strongest between two objects when:
a) They are close and have large masses
b) They are far apart and have small masses
c) They are far apart but have large masses
d) They are close but have small masses
Answer: a) They are close and have large masses
