GENERAL SCIENCE #36
MULTIPLE CHOICE QUESTIONS
1. Two
objects of different masses falling freely near the surface of the moon would
……………
(a) have same velocities at any instant
(b) have different acceleration
(c) experience forces of same magnitude
(d) undergo a change in their inertia
Answer:
(a)
2. The
value of acceleration due to gravity ……………
(a) is same on equator and poles
(b) is least on poles
(c) is least on equator
(d) increases from pole to equator
Answer:
(c)
3. 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
(b) F/2
(c) F
(d) 2F
Answer:
(a)
4. A
boy is whirling a stone tied to a string in a horizontal circular path. If the
string breaks, the stone ……………
(a) will continue to move in the circular path
(b) will move along a straight line towards the centre of
the circular path
(c) will move along a straight line tangential to the
circular path
(d) will move along a straight line perpendicular to the
circular path away from the boy
Answer:
(c)
5. In
the relation F = GM mld2, the quantity G ……………
(a) depends on the value ofg at the place of observation
(b) is used only when the Earth is one of the two masses
(c) is greatest at the surface of the Earth
(d) is universal constant of nature
Answer:
(d)
6. 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)
7. 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
Answer:
(d)
8. The
atmosphere is held to the Earth by which of the following?
(a) gravity
(b) wind
(c) clouds
(d) Earth’s magnetic field
Answer:
(a)
9. What
is called the force of attraction between two-unit point masses separated by a
unit distance?
(a) gravitational potential
(b) acceleration due to gravity
(c) gravitational field
(d) universal gravitational constant
Answer:
(d)
10. 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
Answer:
(a)
11. 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
Answer:
(a)
12. A
girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in
three ways. In which of the following cases, pressure exerted by the box will
be ……………
(a) maximum when length and breadth form the base
(b) maximum when breadth and width form the base
(c) maximum when width and length form the base
(d) the same in all the above three cases
Answer:
(b)
13. An
apple falls from a tree because of gravitational attraction between the Earth
and the apple. If F1 is the magnitude of force exerted by the Earth
on the apple and F2 is the magnitude of 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
Answer:
(d)
14. he
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
Answer:
(b)
15. 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
Answer:
(c)
16. 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
Answer:
(c)
17. What
is the SI unit of pressure?
(a) Nm2
(b) N/m
(c) N/m2
(d) N2/m2
Answer:
(c)
18. 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
Answer:
(a)
19. What
is the SI unit of mass?
(a) Gram
(b) Kilogram
(c) Litre
(d) Hour
Answer:
(b)
20. The
acceleration due to gravity of moon is …………… of that of the Earth.
(a) one sixth
(b) one fourth
(c) one third
(d) one fifth
Answer:
(a)
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