MULTIPLE CHOICE QUESTIONS:

CLASS 9 SCIENCE 10: GRAVITATION MULTIPLE CHOICE QUESTIONS:
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MULTIPLE CHOICE QUESTIONS: (MCQ’s )

1.  The earth attracts objects towards it. This is due to ____force.

(a) Gravitational
(b) Frictional
(c) Muscular
(d) Contact

2.  The magnitude of the gravitational force F will be equal to the product of ____ and ____ due to the gravitational force.

(a) Mass,velocity
(b) Mass, acceleration
(c) Acceleration,velocity
(d) None of these

3.  The value of acceleration due to gravity of the earth, g = ____.

(a) 9.7 m s-2
(b) 9.3 m s-2
(c) 9.8 m s-2
(d) 9.5 m s-2 

4.  Greater the mass, the greater is the ____.

(a) Velocity
(b) Acceleration
(c)  Speed
(d) Inertia

5.  The weight of an object is the ____ with which it is attracted towards the earth.

(a) Pressure
(b) Velocity
(c)  Speed
(d) Force

6.  In honour of scientist Blaise Pascal the SI unit of pressure is called ____.

(a) Faraday
(b) Edison
(c) Pascal
(d) Curie

7.  The ____ of this buoyant force depends on the density of the fluid.

(a) Pressure
(b) Magnitude 
(c) Speed
(d) None of these

8.  The ____ of water on the cork is greater than the weight of the cork so it floats.

(a) Upthrust
(b)  Speed
(c)  Acceleration
(d) Velocity

9.  The object of ____ greater than that of a liquid sink in the liquid.

(a) Density
(b) Velocity
(c) Weight
(d) Mass

10.  The upward force exerted by water is known as the force of ____.

(a) Density
(b) Buoyancy
(c) Velocity
(d) All of these

11.  ____ principle has many applications it is used in designing ships and submarines, lactometers.

(a) Edison
(b) Faraday
(c) Archimedes
(d) Pascal

12.  The ____ of a substance is the ratio of its density to that of water.

(a)  Average
(b) Comparison
(c)  Friction
(d) Relative density

13.  ____ is a weak force unless large masses are involved.

(a) Velocity
(b) Acceleration
(c)  Friction 
(d) Gravitational

14.  The weight may vary from place to place but the ____ stays constant.

(a) Velocity
(b) Friction
(c) Mass
(d) Acceleration
 
15. 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
 
16. The atmosphere is held to the Earth by _____ .
(a) Gravity
(b) Wind
(c) Clouds
(d) Earth’s magnetic field
 
17. The value of quantity G in the law of gravitation ______.
(a) Depends on mass of Earth only
(b) Depends on radius of Earth only
(c) Depends on both mass and radius of Earth
(d) Is independent of mass and radius of the Earth
 
18. The force of attraction between two unit point masses separated by a unit distance is called ________ .
(a) Gravitational potential
(b) Acceleration due to gravity
(c) Gravitational field
(d) Universal gravitational constant
 
19. The weight of an object at the centre 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 surface of the Earth
 
20. 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) 2 N
(b) 8 N
(c) 10 N
(d) 12 N
 
21. The acceleration due to gravity on the Earth depends upon the ____ .
(a) Mass of the body
(b) Mass of the Earth
(c) Shape and size of the body
(d) Volume of the body
 
22. When a mango falls from a mango tree then ______. 
(a) Only the Earth attracts the mango.
(b) Only the mango attracts the Earth.
(c) Both the mango and the Earth attract each other.
(d) Both the mango and the Earth repel each other.
 
23. When a ship floats in sea water _____.
(a) The weight of water displaced is greater than the weight of ship
(b) The weight of water displaced is less than the weight of the ship
(c) The weight of water displaced is equal to the weight of the ship
(d) It displaces no water.
 
24. The SI unit of pressure is ______ .
(a) Nm2
(b) N/m
(c) N/m2
(d) N2/m2
 
25. If the gravitational attraction of the Earth suddenly disappears, which of the following statements will be true?
(a) The weight of body will become zero but the mass will remain same.
(b) The weight of a body will remain same but the mass will become zero.
(c) Both mass and weight become zero.
(d) Neither mass nor weight becomes zero.

26. Density of a substance is defined as mass per unit ____

(a) Area
(b) Gravity
(c) Weight
(d) Volume
27. The acceleration due to gravity of moon is ____ of that of the Earth.
(a) Two /sixth
(b) One /tenth
(c) One /sixth
(d) One /fourth
 
28. The accepted value of G is______
(a) 6.673 x 10−¹¹ Nm² kg
(b) 6.672 x 10−¹¹ Nm² kg
(c) 8.673 x 10−¹¹ Nm² kg
(d) 6.473 x 10−¹¹ Nm² kg
 
29. ______of an object is constant,it does not change from place to place.
(a) Velocity
(b) Mass
(c) Weight
(d) Volume

30. ____ of an object is the force due to the gravitational attraction of the earth

(a) Velocity
(b) Mass
(c) Weight
(d) Volume

Answers:

1. (a) Gravitational force
2. (b) Mass, acceleration
3. (c) 9.8 m s-2
4. (d) Inertia
5. (d) Force
6. (c) Pascal
7. (b) Magnitude
8. (a) Upthrust
9. (a) Density
10.(b) Buoyancy
11. (c) Archimedes
12. (d) Relative density
13. (d) Gravitational
14. (c) Mass.
15. (c) Any two bodies having some mass
16.(a) Gravity
17.(d) Is independent of mass and radius of the Earth
18.(d) Universal gravitational constant
19.(a) Zero
20.(a) 2 N
21.(b) Mass of the Earth
22.(c) Both the mango and the Earth attract each other.
23.(c) The weight of water displaced is equal to the weight of the ship
24.(c) N/m2
25.(a) The weight of body will become zero but the mass will remain same.
26. (d) Volume
27. (c) One /sixth
28.(a) 6.673 x 10−¹¹ Nm² kg
29.(b) Mass
30.(c) Weight
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