1.
Mass of an object is-
(a) amount of matter present in
the object
(b) same as weight of an object
(c) measure of gravitational
pull
(d) none of these
ANS: amount of matter present in the
object
2.
SI unit of mass is-
(a) gram
(b) kg
(c) quintal
(d) ton
ANS: kg
3. Which of the following is
correct for mass?
(a) It is a vector quantity
(b) It is not a fundamental
property of material body.
(c) It is the force with which
the earth attracts a body.
(d) It is the quantity of matter
contained in a body.
ANS: It is the quantity of matter
contained in a body
4.
If more force is required to bring a body into a unit acceleration, the
body has
(a) less mass
(b) zero mass
(c) more mass
(d) mass is independent of force
ANS: more mass
5. Which of the following
statements is/are correct?
I.
Mass of an object is the measure of its inertia
II.
Heavier the object smaller is the inertia
III.
The mass of an object is variable
(a) Only I
(b) I and III
(c) II and III
(d) I and II
ANS: Only I
6.
The mass of a body is measured to be 12 kg on the earth. If it is taken
to the moon, its mass will be-
(a) 12 kg
(b) 6 kg
(c) 2 kg
(d) 72 kg
ANS: 12 kg
7.
If the mass of a boy on the surface of the earth is 30 kg, then his mass
on the surface of the moon will be-
(a) 5 kg
(b) 30 kg
(c) 180 kg
(d) zero
ANS: 30 kg
8.
The mass of a body is M on the earth’s surface. What is the mass of the
same body on the moon’s surface?
(a) M
(b) M/6
(c) Zero
(d) M/2
ANS: M
9.
The mass of an astronaut on the surface of the earth is 60 kg. The ratio
of the mass of the astronaut on the surface of earth and on the surface of the
moon will be-
(a) 1:6
(b) 6:1
(c) 2:1
(d) 1:1
ANS: 1:1
10.
The weight of an object is-
(a) the quantity of matter it
contains
(b) refers to its inertia
(c) same as its mass but is
expressed in different units
(d) the force with which it is
attracted towards the earth
ANS: the force with which it is
attracted towards the earth
11.
Weight of an object depends on-
(a) temperature of the place
(b) atmosphere of the place
(c) mass of an object
(d) none of these
ANS: mass of an object
12. SI unit of weight is-
(a) kg
(b) dyne
(c) newton
(d) metre
ANS: newton
13.
Which of the following is correct?
(a) Weight is a scalar quantity
(b) Weight is not a fundamental
quantity
(c) Weight does not depend on
acceleration due to gravity
(d) None of these
ANS: Weight is not a fundamental
quantity
14.
What is the mass of an object whose weight is 49 N on the earth?
(a) 5 kg
(b) 20 kg
(c) 15 kg
(d) 12 kg
ANS: 5 kg
15.
The weight of a rock on the moon is 200.6 N. What is its mass on the
earth?
(a) 20 kg
(b) 118 kg
(c) 200 kg
(d) 1180 kg
ANS: 118 kg
16. An object of mass m is taken to the moon
from the earth-
(a) Mass and weight of the
object will be same as on the earth
(b) mass of the object decreases but
its weight will remain the same on the moon
(c) mass of the object increases
but its weight will remain the same on the moon
(d) mass of the object remains the
same but its weight decreases on the moon
ANS: Mass of the object remains the
same but its weight decreases on the moon
17. The weight of a body is 120
N on the earth. If it is taken to the moon, its weight will be about,
(a) 120 N
(b) 60 N
(c) 20 N
(d) 720 N
ANS: 20 N
18. The weight of a man on the
surface of moon is 300 N. The weight of this man on the surface of the earth
is-
(a) 300 N
(b) 5 N
(c) 50 N
(d) 1800 N
ANS: 1800 N
19. If a planet existed whose
mass was twice that of Earth and whose radius is 3 times greater, how much will
a 1 kg mass weigh on the planet?
(a) 25 N
(b) 2.17 N
(c) 1.1 N
(d) 5 N
ANS: 2.17 N
20.
Consider a heavenly body which has a mass twice that of the earth and a radius
thrice that of the earth. The weight of a book on this heavenly body, if its
weight on the earth is 900 N will be:
(a) 400 N
(b) 600 N
(c) 500 N
(d) 200 N
ANS: 400 N
21.
The weight of a body cannot be expressed in-
(a) kg wt
(b) N
(c) dyne
(d) kg
ANS: kg
22.
10 kg wt is equal to-
(a) 9.8 N
(b) 98 N
(c) 980 N
(d) 1/9.8 N
ANS: 98 N
23. For no change in the mass
of the earth, if its radius is halved the weight of an object of mass 10 kg
will be:
(a) 40 kg wt
(b) 10 kg wt
(c) 80 kg wt
(d) 20 kg wt
ANS: 40 kg-wt
24.
What is the weight of a 7 kg-wt body in a planet whose mass is 1/7 of
that of earth and radius is ½ of the earth?
(a) 4 kg-wt
(b) 8 kg-wt
(c) 7 kg-wt
(d) 2 kg-wt
ANS: 4 kg-wt
25.
The weights of three objects X, Y and Z measured on three celestial
bodies are listed in the box (g on the Moon, Jupiter and Mercury are 1.7 ms-2,
25.4 ms-2 and 3.8 ms-2 respectively).
Object X on the Moon is 340 N
Object Y on Jupiter is 6096 N
Object Z on Mercury is 399 N
Which of the following sequences show
X, Y and Z in ascending order of their masses?
(a) X, Y, Z
(b) Z, X, Y
(c) X, Z, Y
(d) Y, Z, X
ANS: Z, X, Y
26.
If the earth shrinks half in radius, its mass remaining the same, then
by what percentage will the weight of an object on earth change?
(a) decreases by 50%
(b) increases by 50%
(c) decreases by 25%
(d) increases by 300%
ANS: increases by 300%
27.
The weight of an object-
(a) increases when taken from
the pole to the equator
(b) increases when taken from the
equator to the pole
(c) increases when taken from
Delhi to the top of Mount Everest
(d) increases when taken from
the surface of the earth to moon
ANS: increases when taken from the
equator to the pole
28. Arun buys 5 gram of gold at
the poles. The weight of the gold at the equator will be-
(a) 5 g
(b) less than 5 g
(c) greater than 5 g
(d) 5.5 g
ANS: less than 5 g
29. A person weighs W at Delhi.
The weight of the person on the peak of Mount Everest will be-
(a) = W
(b) > W
(c) < W
(d) zero
ANS: < W
30.
A person weighs W on the surface of the earth. The weight of the person
at the centre of the earth will be-
(a) < W
(b) > W
(c) = W
(d) Zero
ANS: Zero
31. A person can jump upto 5
feet on the surface of the earth. On the surface of the moon, the same person
can jump-
(a) = 5 ft
(b) < 5 feet
(c) > 5 feet
(d) as much as he wants
ANS: > 5 feet
32. Weight of an astronaut on
the surface of the earth is W1 and his weight on the surface of the
moon is W2. The ratio W1/W2 will be-
(a) 1:6
(b) 6:1
(c) 1:1
(d) 36:1
ANS: 6:1
33. In spaceship moving in
space, person experience weightlessness as the value of,
(a) mass is zero
(b) acceleration due to gravity
is zero
(c) gravitational force is zero
(d) none of these
ANS: acceleration due to gravity is
zero
34.
Consider an elevator moving downwards with an acceleration a, the force
exerted by a passenger of mass m on the floor of the elevator is-
(a) ma
(b) ma - mg
(c) mg - ma
(d) mg + ma
ANS: ma - ma
35.
If an elevator is moving vertically up with an acceleration a, the force
exerted on the floor by a passenger of mass m is-
(a) mg
(b) ma
(c) mg - ma
(d) mg + ma
ANS: mg + ma
No comments:
Post a Comment