MCQ & Online Test – Gravitation – NCERT Class 9 Science Chapter 10

Online Test | MCQ Gravitation | NCERT Class 9 Science Chapter 10 | CBSE Syllabus

Every student of class 9 of NCERT/CBSE syllabus may take part this online test of NCERT Class 9 Science Chapter 10 MCQ Gravitation and verify his score to check preparedness

#1. An object is put one by one in three liquids having different densities. The object floats 1/9, 2/11 & 3/7 parts of their volumes outside the liquid surface in liquids of densities d₁, d₂, d₃ respectively. Which of the following statement is correct?

a) d₁> d₂> d₃

a) d₁> d₂> d₃

b) d₁> d₂< d₃

b) d₁> d₂< d₃

a) d₁< d₂> d₃

a) d₁< d₂> d₃

a) d₁< d₂< d₃

a) d₁< d₂< d₃

#2. The gravitational force between two objects is F. If masses of both objects are halved without changing the distance between them, then the gravitational force would become

a) F/4

a) F/4

b) F/2

b) F/2

c) F

c) F

d) 2F

d) 2F

#3. An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be

a) 12 N

a) 12 N

b) 2 N

b) 2 N

c) 8 N

c) 8 N

d) 10 N

d) 10 N

#4. The force of attraction between two-unit point masses separated by a unit distance is called

a) gravitational potential

a) gravitational potential

b) acceleration due to gravity

b) acceleration due to gravity

c) gravitational field

c) gravitational field

d) universal gravitational constant

d) universal gravitational constant

#5. A girl stands on a box having 60 cm length, 40 cm breadth & 20 cm width in three ways. In which of the following cases pressure exerted by the brick will be

a) maximum when length & breadth form the base

a) maximum when length & breadth form the base

b) maximum when breadth & width form the base

b) maximum when breadth & width form the base

c) maximum when width & length form the base

c) maximum when width & length form the base

d) the same in all the above cases

d) the same in all the above cases

#6. An apple falls from a tree because of gravitational attraction between the Earth & apple. If F₁ is the magnitude of force exerted by the Earth on the apple & F₂ is the magnitude of force exerted by apple on Earth, then

a) F₁ >> F₂

a) F₁ >> F₂

b) F₂ >> F₁

b) F₂ >> F₁

c) F₁ > F₂

c) F₁ > F₂

d) F₁ = F₂

d) F₁ = F₂

#7. A boy is whirling a stone tied with a string in a horizontal circular path. If the string breaks, the stone

a) will move along a straight line tangential to the circular path

a) will move along a straight line tangential to the circular path

b) will move along a straight line perpendicular to the circular path away from the boy

b) will move along a straight line perpendicular to the circular path away from the boy

c) will move along a straight line towards the center of the circular path

c) will move along a straight line towards the center of the circular path

d) will continue to move in the circular path

d) will continue to move in the circular path

#8. In the relation F=GMm/d², the quantity G

a) depends on the value of g at the place of observation

a) depends on the value of g at the place of observation

b) is used only when the Earth is one of the two masses

b) is used only when the Earth is one of the two masses

c) is greatest at the surface of the earth

c) is greatest at the surface of the earth

d) is universal constant of nature

d) is universal constant of nature

#9. The atmosphere is held to the Earth by

a) wind

a) wind

b) clouds

b) clouds

c) gravity

c) gravity

d) magnetic of the Earth

d) magnetic of the Earth

#10. What will be the weight of an object at the Centre of the Earth of radius R

a) infinite

a) infinite

b) zero

b) zero

c) R times the weight at the surface of the Earth

c) R times the weight at the surface of the Earth

d) 1/R² times the weight at the surface of the Earth

d) 1/R² times the weight at the surface of the Earth

#11. The value of quantity G in the law of gravitation

a) depends on mass of the Earth only

a) depends on mass of the Earth only

b) depends on radius of the Earth only

b) depends on radius of the Earth only

c) depends on both mass & radius of the Earth

c) depends on both mass & radius of the Earth

d) is independent of both mass & radius of the Earth

d) is independent of both mass & radius of the Earth

#12. As per law of gravitation, the gravitational force acts between

a) the earth & the sun only

a) the earth & the sun only

b) the earth & a point mass only

b) the earth & a point mass only

c) two charged bodies only

c) two charged bodies only

d) any two bodies which have some mass

d) any two bodies which have some mass

#13. Two objects of different masses falling freely near the surface of moon would

a) have different accelerations

a) have different accelerations

b) experience forces of same magnitude

b) experience forces of same magnitude

c) undergo a change in their inertia

c) undergo a change in their inertia

d) have same velocities at any instant

d) have same velocities at any instant

#14. Two particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be

a) 1/4 times

a) 1/4 times

b) 4 times

b) 4 times

c) 1/2 times

c) 1/2 times

d) unchanged

d) unchanged

#15. The weight of a body felt in tap water & salty water are W_A & W_B respectively, then

a) W_A = W_B

a) W_A = W_B

b) W_A > W_B

b) W_A > W_B

c) W_A < W_B

c) W_A < W_B

d) W_A = 2 W_B

d) W_A = 2 W_B

#16. The value of acceleration due to gravity

a) is least on equator

a) is least on equator

b) is least on poles

b) is least on poles

c) increases from pole to equator

c) increases from pole to equator

d) is same on equator & poles

d) is same on equator & poles

Finish

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To Be Continued