SEBA Class 9 Science Chapter 10 Gravitation MCQs (2026–27) – Assam Eduverse

Q1. The force by which the earth attracts objects towards its centre is called
a) Magnetic force
b) Electrostatic force
c) Gravitational force
d) Frictional force
Answer: c) Gravitational force

Q2. According to the universal law of gravitation, the force between two objects is directly proportional to
a) Sum of their masses
b) Product of their masses
c) Square of their distance
d) Difference of their masses
Answer: b) Product of their masses

Q3. The gravitational force between two objects is inversely proportional to
a) Distance
b) Square of distance
c) Cube of distance
d) Mass
Answer: b) Square of distance

Q4. The SI unit of universal gravitational constant (G) is
a) N kg
b) N m
c) N m² kg⁻²
d) kg m²
Answer: c) N m² kg⁻²

Q5. The value of G is
a) 6.7 × 10¹¹ N m² kg⁻²
b) 6.7 × 10⁻¹¹ N m² kg⁻²
c) 9.8 m s⁻²
d) 10 N m² kg⁻²
Answer: b) 6.7 × 10⁻¹¹ N m² kg⁻²

Q6. The acceleration due to gravity on the surface of the earth is approximately
a) 8 m s⁻²
b) 9.8 m s⁻²
c) 10.8 m s⁻²
d) 6.7 m s⁻²
Answer: b) 9.8 m s⁻²

Q7. Free fall is when an object falls under the influence of
a) Air resistance
b) Magnetic force
c) Gravitational force only
d) Friction
Answer: c) Gravitational force only

Q8. The unit of acceleration due to gravity is
a) N
b) kg
c) m s⁻²
d) m s
Answer: c) m s⁻²

Q9. The value of g is maximum at the
a) Equator
b) Poles
c) Centre of earth
d) Tropics
Answer: b) Poles

Q10. The mass of an object
a) Changes from place to place
b) Is zero in space
c) Remains constant everywhere
d) Is less on the moon
Answer: c) Remains constant everywhere

Q11. Weight of an object is equal to
a) m + g
b) m – g
c) m × g
d) g/m
Answer: c) m × g

Q12. The SI unit of weight is
a) kg
b) newton
c) m s⁻²
d) pascal
Answer: b) newton

Q13. The weight of an object on the moon is
a) Same as on earth
b) Double that on earth
c) Half that on earth
d) One-sixth of that on earth
Answer: d) One-sixth of that on earth

Q14. Thrust is defined as force acting
a) Parallel to surface
b) Along the surface
c) Perpendicular to surface
d) In circular path
Answer: c) Perpendicular to surface

Q15. Pressure is equal to
a) Area/Force
b) Force × Area
c) Thrust/Area
d) Mass × g
Answer: c) Thrust/Area

Q16. The SI unit of pressure is
a) Newton
b) Pascal
c) kg m⁻³
d) m s⁻²
Answer: b) Pascal

Q17. Objects experience buoyant force when they are
a) Heated
b) Cooled
c) Immersed in fluid
d) In vacuum
Answer: c) Immersed in fluid

Q18. The buoyant force acts in
a) Downward direction
b) Upward direction
c) Horizontal direction
d) Circular direction
Answer: b) Upward direction

Q19. An object floats in water when its density is
a) Greater than water
b) Equal to air
c) Less than water
d) Very high
Answer: c) Less than water

Q20. The principle which states that a body immersed in a fluid experiences an upward force equal to the weight of fluid displaced is called
a) Newton’s law
b) Kepler’s law
c) Archimedes’ principle
d) Pascal’s law
Answer: c) Archimedes’ principle

Q26. Assertion: The gravitational force between two objects decreases when the distance between them increases.
Reason: Gravitational force is inversely proportional to the square of distance.
a) Both A and R are true and R is correct explanation of A
b) Both A and R are true but R is not correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is correct explanation of A

Q27. Assertion: The weight of an object is zero at the centre of the earth.
Reason: Acceleration due to gravity becomes zero at the centre of the earth.
a) Both A and R are true and R is correct explanation of A
b) Both A and R are true but R is not correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is correct explanation of A

Q28. Assertion: A crumpled paper falls faster than a flat sheet of paper.
Reason: Air resistance is more on a flat sheet of paper.
a) Both A and R are true and R is correct explanation of A
b) Both A and R are true but R is not correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is correct explanation of A

Q29. Assertion: Pressure exerted by a liquid increases with depth.
Reason: Liquids have weight and exert pressure on the walls and base of container.
a) Both A and R are true and R is correct explanation of A
b) Both A and R are true but R is not correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: b) Both A and R are true but R is not correct explanation of A

Q30. Assertion: An object floats when placed in water if its density is less than that of water.
Reason: Buoyant force depends on the density of the fluid.
a) Both A and R are true and R is correct explanation of A
b) Both A and R are true but R is not correct explanation of A
c) A is true but R is false
d) A is false but R is true
Answer: a) Both A and R are true and R is correct explanation of A