MCQ on Gravitation – Questions and Answers for CBSE 9th class
1-Force is needed to change the ___ of motion of an object.
(A) speed
(B) direction
(C) speed or the direction
(D) none of the above
2-Gravitational force is acting on the
(A) objects
(B) planets
(C) moon
(D) all of the above
3-The force that causes the acceleration and keeps the body moving along the circular path and acting towards the centre, is known as
(A) Centrifugal force
(B) Centripetal force
(C) Gravitation force
(D) None of the above
4-The motion of the moon around the earth is due to the
(A) Centrifugal force
(B) Centripetal force
(C) Gravitation force
(D) None of the above
5-The gravitation force (F) is calculated by
(Where ‘M’ and ‘m’ are masses, ‘d’ is distance and ‘G’ is Universal gravitation constant)
(A) F = GMm/d2
(B) F = GM/md2
(C) F = Gd2/Mm
(D) F = Mm/Gd2
6- The accepted value of Universal gravitation constant (G) is
(A) 6.673 × 10-9 N m2 kg-2
(B) 6.673 × 10-10 N m2 kg-2
(C) 6.673 × 10-11 N m2 kg-2
(D) 6.673 × 10-12 N m2 kg-2
7-Universal law of gravitation is applicable to __ bodies.
(A) celestial
(B) terrestrial
(C) celestial or terrestrial
(D) none of the above
8-The universal law of gravitation successfully explained the following phenomena
(A) the tides due to the moon and the Sun
(B) the motion of planets around the Sun
(C) the force that binds us to the earth
(D) all of the above
9-The value of acceleration due to gravity (g) is
(A) greater at the poles than at the equator
(B) greater at the equator than at the poles
(C) equal at the places of earth
(D) none of the above
10-The value of acceleration due to gravity (g) of the earth is
(A) 9.5 m/s2
(B) 9.6 m/s2
(C) 9.7 m/s2
(D) 9.8 m/s2
11-Which of the following is true for mass of an object
(A) mass of an object is more on earth than on moon
(B) mass of an object is more on moon than on earth
(C) mass of an object is same on earth and moon
(D) none of the above
12-Weight (W) of an object is calculated as
(Where m = mass of object and g = acceleration due to gravity)
(A) W = mg
(B) W = m/g
(C) W = g/m
(D) none of the above
13-SI unit of weight is
(A) Newton
(B) Kilogram
(C) Newton – meter
(D) Newton/meter
14- The upward force exerted by the water on the bottle is known as
(A) buoyant force
(B) centripetal force
(C) centrifugal force
(D) gravitational force
15- The magnitude of buoyant force depends on the
(A) density of the fluid
(B) fluid volume
(C) acceleration due to gravity
(D) all of the above
16-Hydrometer is used to measure
(A) purity of milk
(B) density of liquids
(C) intensity of rain
(D) all of the above
17-Relative density can be calculated as
(A) Relative density = Density of a substance / Density of water
(B) Relative density = Density of water / Density of a substance
(C) Relative density = Density of a substance x Density of water
(D) None of the above
18-The unit of relative density is
(A) Kg/m3
(B) Kg m3
(C) N/m3
(D) No unit
ANSWERS:
1-(C), 2-(D), 3-(B), 4-(B), 5-(A), 6-(C), 7-(C), 8-(D), 9-(A), 10-(D), 11-(C), 12-(A), 13-(A), 14-(A), 15-(D), 16-(B), 17-(A), 18-(D)