PHYSICS
MOTION & LAWS OF MOTION
TEST-2
31. Two elastic balls collide with each other. The relationship between their velocities before collision,V1 & V2 and after collision, V1’ & V2’, is given by:
a) V1 + V2 = V1’ + V2’
b) V1 - V2 = V1’ - V2’
c) V1 - V1’ = V2
- V2’
d) V1 - V2 = V2’- V1’
32. If two bodies of equal mass collide elastically then:
a) Their velocities are added to each other
b) Their velocities are subtracted
c) Their velocities do not change
d) They exchange their velocities
33.
When a ball of mass m1 moving with velocity V1 collides
elastically with another ball with mass m and velocity
V2 = 0, its velocity after collision v1’will
be:
a) v1’= m1-m2/ m1+m2 V1
b) v1’= m1+m2/ m1-m2 V1
c) v1’=2m1 m2/ m1+
m2 V1
d) v1’=m1/m1+m2
V1
34. When a ball of mass m1 moving with
velocity V1 collides with another ball with mass m2 and
velocity V2=0,The velocity (V2’
) of m2 after collision will be:
a) V2’=
m1/m1+m2
V1
b) V2’= 2m1/m1-m2
V1
c) V2’= 2m1/m1+m2
V1
d) V2’=
2m2/m1+m2 V1
35. When a body of mass m moving with velocity V collides
elastically with another body of the same mass and at rest then after the
collision:
a) Both of them come to rest
b) Both move with the same velocity V
c) Both move with velocity V/2
d) The
first body comes to rest while the other moves with velocity V
36. If a body whose mass is much less than a body at rest
collides with it elastically, then it bounces back with:
a) Same velocity
b) Double velocity
c) Half of the velocity
d) No velocity
37. When the mass of the colliding body is much larger
than the mass of the body at rest, its velocity after collision:
a) Becomes double
b) Becomes half
c) Becomes zero
d) Remains the same
38. If the mass of a body, moving with velocity V, is
much larger than the body with which it collides elastically, thev velocity of the other body after collision becomes:
a) V
b) 2V
c) 3V
d) 4V
39. The force which resists motion of a body is called:
a) Force of friction
b) Fictitious force
c) Reacting force
d) None of the above
40. The force of static friction is always _______ the
applied force.
a) Equal and in the same direction to
b) Equal and opposite to
c) Less than
d) More than
41. The force of maximum static friction is _______ the
force of sliding friction.
a) Slightly less than
b) Slightly more than
c) Equal to
d) Half of
42. Force of kinetic friction is proportional to the:
a) Applied force
b) Normal reaction
c) Area of contact
d) Velocity
43. When a block placed on a horizontal rough surface is
about to slip under the action of an applied force, the value of static friction is given by:
a) Fsmax = UK Fn
b) Fsmax = US FK
c) Fsmax = UK FK
d) Fsmax = US Fn
44. Force of kinetic friction given by:
a) Fk =UK Fn
b) Fk = US Fn
c) Fk = US Fs
d) Fk = UK Fs
45. According to Stoke’s law the force of friction acting
on a spherical ball of radius r moving with velocity V in a fluid of viscosity N is given by:
a) FD = 6 Pi N rV
b) FD = 4 Pi N r2V
c) FD = 2 Pi N rV
d) FD = 6 Pi N rV2
46. Terminal velocity is the velocity of a body moving in
a fluid which attains a maximum value due to:
a) Gravity
b) Fluid friction
c) Surface friction
d) Applied force
47. Hovercraft moves on the surface of land and water on
a cushion of:
a) Air
b) Water
c) Cotton
d) Foam
48.The force acting on a body of mass m is placed on an
inclined plane making an angle @ with the horizontal is:
a) mg sin@
b) mg cos@
c) mg tan@
d) mg
49. If a body changes its position with respect to its
surroundings then it is said to be in state of _______.
a) Motion
b) Rest
c) Displacement
d) Velocity
50. If a body does not change its position with respect
to its surroundings then it is said to be in state of ________.
a) Motion
b) Rest
c) Displacement
d) None of these
51. The shortest distance between two points in known as
_______.
a) Motion
b) Rest
c) Displacement
d) None of these
52. Displacement is a _______ quantity.
a) Vector
b) Scalar
c) Positive
d) None of these
53.The total distance covered per unit time is called
_______.
a) Vector
b) Velocity
c) Speed
d) Distance
55. The S.I. unit OF speed is _______.
a) m/s2
b) km/h
c) m/s
d) N
56. The distance covered by a body in unit time in
specified direction is called _______.
a) Speed
b) Velocity
c) Uniform velocity
d) None of these
58. Velocity is a _______ quantity.
a) Scalar
b) Vector
c) Positive
d) Negative
59.The dimension for velocity is _______.
a) [LT-1]
b) [LT-2]
c) [LT-3]
d) [LT-4]
60. If a body covers unequal displacement in equal
intervals of time or equal displacement in unequal intervals of time, then it is said to be moving with _______.
a) Constant velocity
b) Variable velocity
c) Average velocity
d) None of these
ANSWER KEY
Question
|
Answers
|
Question
|
Answers
|
Question
|
Answers
|
31.
|
D
|
41
|
B
|
51
|
C
|
32.
|
D
|
42
|
B
|
52
|
A
|
33
|
A
|
43
|
D
|
53
|
C
|
34
|
C
|
44
|
A
|
54
|
A
|
35
|
D
|
45
|
A
|
55
|
C
|
36
|
A
|
46
|
B
|
56
|
B
|
37
|
A
|
47
|
A
|
57
|
A
|
38
|
B
|
48
|
A
|
58
|
B
|
39
|
A
|
49
|
A
|
59
|
A
|
40
|
B
|
50
|
B
|
60
|
B
|
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