Do you need some help in preparing for your upcoming Class 9 Science exam? We’ve compiled a list of MCQ questions on Gravitation Class 9 MCQs Questions with Answers to get you started with the subject. You can download NCERT MCQ Questions for Class 9 Science Chapter 10 Gravitation with Answers Pdf free download, and learn how smart students prepare well ahead MCQ Questions for Class 9 Science with Answers.
Gravitation Class 9 MCQs Questions with Answers
Solving Gravitation Multiple Choice Questions of Class 9 Science Chapter 10 MCQ can be really beneficial because you will be familiar with all of the topics. These MCQ Questions on Gravitation Class 9 with answers provide for a quick review of the Chapter, allowing you to have a better understanding of the subject.
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
Answer
Answer: (a) Newton m2/kg2
Question 2.
The gravitational constant is denoted by which symbol?
(a) g
(b) M
(c) G
(d) k
Answer
Answer: (c) G
Question 3.
The unit of weight in the S.I. system is:
(a) kg m2
(b) Newton
(c) ms-2
(d) ms
Answer
Answer: (b) Newton
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 = \(\frac{1}{2}\)
Answer
Answer: (c) u = 0
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
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
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
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
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
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
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
Answer
Answer: (a) gravity
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
Answer: (c) any two bodies having some mass
Fill in the Blanks.
Question 1.
Force of gravitation due to the earth is called _________
Answer
Answer: gravity
Question 2.
The force of gravity _______ with altitude.
Answer
Answer: decreases
Question 3.
The force of gravity _______ from poles to the equator.
Answer
Answer: decreases
Question 4.
The ______ of a body is the force with which the earth attracts it.
Answer
Answer: weight
Question 5.
The accepted value of G is _________
Answer
Answer: 6.673 × 10-11 Nm2 kg-2
Question 6.
Relative density has ______ unit.
Answer
Answer: no
Question 7.
The value of g is taken as _________
Answer
Answer: 9.8 ms-2
True/False.
Question 1.
The value of acceleration due to gravity is 9.8 ms-2
Answer
Answer: True
Question 2.
The value of acceleration due to gravity on the moon is g/6.
Answer
Answer: True
Question 3.
The value of G was found out by Henry Cavendish by using a sensitive balance.
Answer
Answer: True
Question 4.
The mass of an object is constant and does not change from place to place.
Answer
Answer: True
Question 5.
The relative density of a substance is the product of its density and that of water.
Answer
Answer: False
Question 6.
Gravitation is a weak force unless bodies of large masses are involved.
Answer
Answer: True
Question 7.
The weight of an object is equal to the ratio of its mass and acceleration due to gravity.
Answer
Answer: False
Question 8.
The weight may vary from place to place but the mass stays constant.
Answer
Answer: True
Question 9.
All objects experience a force of buoyancy when they are immersed in a fluid.
Answer
Answer: True
Question 10.
Objects having more density than that of the liquid in which they are immersed, float on the surface of the liquid.
Answer
Answer: False
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 |
Answer
Answer:
| 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 |
Answer in one Word/Sentence.
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
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
Answer: The value of g decreases
Question 3.
What is the value of g on earth’s center?
Answer
Answer: Zero
Question 4.
What will be the weight of a person, sitting in a spacecraft which is revolving around the earth?
Answer
Answer: Zero
Question 5.
Write S.I. unit of G.
Answer
Answer: Nm2 kg-2 or Nm2/kg2
Question 6.
How many newtons are there in 1 kg weight?
Answer
Answer: 9.8 N
Question 7.
What is the value of acceleration due to gravity at the moon?
Answer
Answer: 1.63 ms-2
Question 8.
Write the S.I. unit of pressure.
Answer
Answer: N/m2 or Nm-2
Question 9.
Which symbol is used to show the S.I. unit of pressure?
Answer
Answer: Pa (Pascal)
Question 10.
What is the thrust on a unit area called?
Answer
Answer: Pressure
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