MCQ on Gravitation Class 9. We covered all the MCQ on Gravitation Class 9 in this post for free so that you can practice well for the exam.
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MCQ on Gravitation for Students
An empty closed drum and a filled drum of the same dimension will bring
(a) the same upthrust
(b) the same volume
(c) both (a) and (b)
(d) neither (a) nor (b)
Option c – both (a) and (b)
Acceleration due to gravity for objects on or near the surface of the earth is represented as
(a) g = GM/R²
(b) g = GMm/d²
(c) Both (a) and (b)
(d) Neither (a) nor (b)
Option a – g = GM/R²
The weight of an object at the center of the earth of radius R is
(a) zero
(b) infinite
(c) R times the weight at the surface of the earth
(d) 1/R² times the weight at the surface of the earth
Option a – zero
An apple falls from a tree because of gravitational attraction between the earth and the apple. If F1 is the magnitude of the force exerted by the earth on the apple and F₂ is the magnitude of the force exerted by the apple on the earth, then
(a) F1 is very much greater than F₂
(b) F2 is very much greater than F1
(c) F1 is only a little greater than F₂
(d) F1 and F₂ are equal
Option d – F1 and F₂ are equal
The gravitational force between the earth and an object on the surface of the earth is best given by the formula
(a) F = mg
(b) F = g M/r²
(c) F = G x M x m/d²
(d) All of these
Option c – F = G x M x m/d²
The universal law of gravitation explains the phenomenon
(a) The force that binds us to the earth
(b) The motion of the moon around the earth or planets around the Sun
(c) The tides due to the moon and the Sun
(d) All of the these
Option d – All of the these
The least value of the apparent weight of a body in a fluid is
(a) > 0
(b) = 0
(c) < 0
(d) depending on the density of solid and fluid
Option b – = 0
A heavy cylinder of length 1 is slowly taken out of a dense liquid. The weight felt as if it is taken out of the liquid.
(a) will remain the same
(b) increases as it comes out
(c) decreases as it comes out
(d) increases till it attains the weight in the air
Option d – increases till it attains the weight in the air
Relative density of a substance
(a) is described as the ratio of the density of a substance to that of air
(b) is described as the ratio of the density of a substance to that of water
(c) does not have any unit
(d) Both (b) and (c)
Option d – Both (b) and (c)
Select the correct statement :
(a) Objects of density less than that of a liquid will float on the liquid.
(b) Objects of density more than that of a liquid will sink in the liquid.
(c) Both (a) and (b)
(d) None of these
Option c – Both (a) and (b)
Archimede’s principle states that :
(a) When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it.
(b) When a body is floating on a liquid, it experiences a downward force that is equal to the weight of the fluid under it
(c) When a body is immersed in a fluid, it experiences an upward force that is equal to the difference in their weights
(d) All are true
Option a – When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it
The buoyant force is
(a) the upward force exerted by a liquid on an object
(b) known as upthrust
(c) the force exerted by an object on the liquid
(d) Only (a) and (b)
Option d – Only (a) and (b)
The magnitude of the buoyant force depends on the
(a) the mass of the object
(c) the density of the fluid
(d) the weight of the object
Option c – the density of the fluid
Upthrust varies as a body comes out of the liquid as A: It depends on immersed volume alone B: Volume = Cross-section area x Length Then
(a) Only A is correct
(b) Only B is correct
(c) Both A and B are correct
(d) Neither A nor B is correct
Option c – Both A and B are correct
The value of g becomes
(a) greater at the poles than at the equator
(b) greater at the equator than at the North Pole
(c) greater at the equator than at the South Pole
(d) zero at the equator
Option a – greater at the poles than at the equator
Four students A, B, C, and D find the acceleration due to gravity at the top of Ooty, Nainital, Mount Everest, and Shimla. The acceleration due to gravity is the least
(a) at Ooty, since it is the highest
(b) at Mount Everest as it is the highest
(c) at Nainital as only latitude has the effect and not the height of the peak.
(d) at Shimla as it is the coldest
Option b – at Mount Everest as it is the highest
The value of g is taken as
(a) Positive for acceleration during free fall
(b) Negative when the objects are thrown upwards
(c) Positive in both cases
(d) Only (a) and (b)
Option d – Only (a) and (b)
The weight of an object is the
(a) Mass of the object
(b) the Force with which it is attracted towards the earth
(c) the Product of its mass and acceleration due to gravity
(d) Only (b) and (c)
Option d – Only (b) and (c)
The force acting on an object perpendicular to the surface is called
(a) buoyancy
(b) thrust
(c) surface Tension
(d) None of these
Option b – thrust
We covered all the MCQ on gravitation class 9 above in this post for free so that you can practice well for the exam.
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