# MCQ Questions for Class 9 Science Chapter 10 Gravitation

Solving the Gravitation Multiple Choice Questions of Class 9 Science Chapter 10 MCQ can be of extreme help as you will be aware of all the concepts. These MCQ Questions on Gravitation Class 9 with answers pave for a quick revision of the Chapter thereby helping you to enhance subject knowledge. Have a glance at the MCQ of Chapter 10 Science Class 9 and cross-check your answers during preparation.

Multiple Choice Questions

Question 1.
The unit of G in the S.I. system is:
(a) Newton m2/kg2
(b) Newton m2 kg2
(c) Newton m kg
(d) Newton m2/kg

Question 2.
The gravitational constant is denoted by which symbol?
(a) g
(b) M
(c) G
(d) k

Question 3.
The unit of weight in the S.I. system is:
(a) kg m2
(b) Newton
(c) ms-2
(d) ms

Question 4.
When an object is released from a height, its initial velocity is:
(a) u = 100 ms-1
(b) u = 9.8 ms-1
(c) u = 0
(d) u = $$\frac{1}{2}$$

Question 5.
The relation between g and G is:
(a) $$g=\frac{\mathrm{GM}}{\mathrm{R}^{2}}$$
(b) g = GMR2
(c) $$g=\frac{M R^{2}}{G}$$
(d) $$g=\frac{\mathrm{GR}^{2}}{\mathrm{M}}$$

Answer: (a) $$g=\frac{\mathrm{GM}}{\mathrm{R}^{2}}$$

Question 6.
The mass of the earth is:
(a) 6.4 × 1024
(b) 6 × 1010 kg
(c) 6 × 1024 kg
(d) 6 × 1019 kg

Answer: (c) 6 × 1024 kg

Question 7.
The radius of the earth is:
(a) 6.4 × 10-6 m
(b) 6.4 × 106 m
(c) 4.6 × 106 m
(d) 6.4 × 104 m

Answer: (b) 6.4 × 106 m

Question 8.
By applying the universal law of gravitation, the weight of the object on the moon will be:
(a) $$\mathrm{W}_{m}=\frac{\mathrm{GR}_{m}^{2}}{\mathrm{M}_{m} \times m}$$
(b) $$\mathrm{W}_{m}=\frac{\mathrm{GM}_{m} \times \mathrm{R}_{m}^{2}}{m}$$
(c) $$\mathrm{W}_{m}=\mathrm{G} \frac{\mathrm{R}_{m}^{2} \times m}{\mathrm{M}_{m}}$$
(d) $$\mathrm{W}_{m}=\mathrm{G} \frac{\mathrm{M}_{m} \times m}{\mathrm{R}_{m}^{2}}$$

Answer: (d) $$\mathrm{W}_{m}=\mathrm{G} \frac{\mathrm{M}_{m} \times m}{\mathrm{R}_{m}^{2}}$$

Question 9.
The value of acceleration due to gravity:
(a) is the same on the equator and poles
(b) is least on poles
(c) is least on the equator
(d) increases from pole to equator

Answer: (c) is least on the equator

Question 10.
The value of quantity G in the law of gravitation:
(a) depends on the mass of earth only
(b) depends on the radius of the earth only
(c) depends on both the mass and radius of the earth
(d) is independent of the mass and radius of the earth

Answer: (d) is independent of the mass and radius of the earth

Question 11.
The atmosphere is held to the earth by:
(a) gravity
(b) wind
(c) clouds
(d) earth’s magnetic field

Question 12.
Law of gravitation gives the gravitational force between:
(a) the earth and a point mass only
(b) the earth and sun only
(c) any two bodies having some mass
(d) two charged bodies only

Answer: (c) any two bodies having some mass

Fill in the Blanks.

Question 1.
Force of gravitation due to the earth is called _________

Question 2.
The force of gravity _______ with altitude.

Question 3.
The force of gravity _______ from poles to the equator.

Question 4.
The ______ of a body is the force with which the earth attracts it.

Question 5.
The accepted value of G is _________

Answer: 6.673 × 10-11 Nm2 kg-2

Question 6.
Relative density has ______ unit.

Question 7.
The value of g is taken as _________

True/False.

Question 1.
The value of acceleration due to gravity is 9.8 ms-2

Question 2.
The value of acceleration due to gravity on the moon is g/6.

Question 3.
The value of G was found out by Henry Cavendish by using a sensitive balance.

Question 4.
The mass of an object is constant and does not change from place to place.

Question 5.
The relative density of a substance is the product of its density and that of water.

Question 6.
Gravitation is a weak force unless bodies of large masses are involved.

Question 7.
The weight of an object is equal to the ratio of its mass and acceleration due to gravity.

Question 8.
The weight may vary from place to place but the mass stays constant.

Question 9.
All objects experience a force of buoyancy when they are immersed in a fluid.

Question 10.
Objects having more density than that of the liquid in which they are immersed, float on the surface of the liquid.

Match the Column.

Question 1.

 A B 1. The value of g (i) g/6 2. The value of G (ii) maximum 3. The value of g at the centre of the earth (iii) 6.673 × 10-1 Nm2 kg-2 4. The value of g at the earth’s poles (iv) 9.8 ms-2 5. The value of g on the moon (v) zero

 A B 1. The value of g (iv) 9.8 ms-2 2. The value of G (iii) 6.673 × 10-1 Nm2 kg-2 3. The value of g at the centre of the earth (v) zero 4. The value of g at the earth’s poles (ii) maximum 5. The value of g on the moon (i) g/6

Question 1.
Write down the formula which shows the relation between the mass of the earth M, the radius of the earth R, acceleration due to gravity g, and universal constant of gravitation G.

Answer: $$g=\frac{\mathrm{GM}}{\mathrm{R}^{2}}$$

Question 2.
What will be the change in the value of g while going in-depth?

Answer: The value of g decreases

Question 3.
What is the value of g on earth’s center?

Question 4.
What will be the weight of a person, sitting in a spacecraft which is revolving around the earth?

Question 5.
Write S.I. unit of G.

Question 6.
How many newtons are there in 1 kg weight?

Question 7.
What is the value of acceleration due to gravity at the moon?

Question 8.
Write the S.I. unit of pressure.

Question 9.
Which symbol is used to show the S.I. unit of pressure?

Question 10.
What is the thrust on a unit area called?