MDCAT Physics Chapter 2 online mcq test with answers for chapter 2 (Work and Energy)

Question # 1

A body of mass m having an initial velocity v, makes head on elastic collision with a stationary body of mass m. After the collision, the body of mass m comes to rest and only the body having mass M moves. This will happen only when:

m>>M A
m<<M B
) m=M C
m=1M D

Question # 2

The distance covered by a body in time ‘t’ starting from rest is:

1/2 𝑡² A
vt B
𝑎𝑡² C
𝑎𝑡₂ D

Question # 3

Two railway trucks of masses m and 3m move towards each other in opposite directions with speeds 2v and v respectively. These trucks collide and stick together. What is the speed of the trucks after the collision?

v/4 A
v/2 B
v C
5v/4 D

Question # 4

The angle of projection, at which the range of projectile would become half of its maximum value.

45Degree A
30Degree B
15Degree C
60 Degree D

Question # 5

The angular momentum of a body changes from 30 J-S to 50 J-S in 0.5 sec. The torque acting on it is

40 N-m A
100 N-m B
50 N-m C
150 N-m D

Question # 6

Two bodies are projected at angle 𝜽 𝒂𝒏𝒅 (𝟗𝟎 − 𝜽) to the horizontal with the same speed. The ratio of their times of flight is:

sin 𝜃 : 1 A
cos 𝜃 : 1 B
sin 𝜃 : cos𝜃 C
cos 𝜃 : sin𝜃 D

Question # 7

Newton’s third law concerns the forces of interaction between two bodies. Which of the following statement relating to the third law is not correct:

The two forces must be the same type A
The two forces must act on different bodies B
The two forces are always opposite in direction C
The two forces are equal and opposite so the bodies are in equilibrium D

Question # 8

The centre of gravity of a triangular plate is at

On end of the plate A
The midpoint of any side of the plate B
The midpoint of any side of the plate C
The midpoint of any side of the plate D

Question # 9

Two 8 N forces act on each end of the beam of length 0.60m. Two forces are parallel and acting opposite to each other, the angle between the force and beam is 60o , what is the torque of the couple exerted on the beam:

2.4 Nm A
4.2 Nm B
4.8 Nm C
9.6 Nm D

Question # 10

A body is in translational equilibrium if

P = 0 A
L = 0 B
F = 0 C
 = 0 D

Question # 11

If velocity time graph is a straight line parallel to time axis then body is

Moving with zero acceleration A
Moving with constant velocity B
Covering equal displacement in equal intervals of time C
All of these D

Question # 12

If a body changes its momentum from 100 N s to 200 N s in 10 s then the unbalanceexternal force responsible to change the momentum is

5 N A
2.5 N B
2n C
10n D

Question # 13

In the absence of air resistance, a stone is thrown from P and follows a parabolic path in which the highest point reached is T. The vertical component of acceleration of stone is:

Zero at T A
Greatest at T B
) Greatest at P C
the same at P as at T D

Question # 14

A rigid uniform bar of length 2.4 m is pivoted horizontally at its mid-point, weights are hung from two points of the bar as shown in diagram. To maintain horizontal equilibrium, a couple is applied to the bar: What is the torque and the direction of couple?

40 N m clockwise A
40 N m anti-clockwise B
80 N m clockwise C
80 N m anti-clockwise D

Question # 15

A boy is travelling from Lahore to Karachi with uniform velocity . Its

Speed changes A
Acceleration changes B
Direction of motion changes C
Displacement from origin changes D

Question # 16

A stone is thrown upwards it returns to ground describing a parabolic path which of the following remains constant:

Speed of the ball A
Kinetic energy of the ball B
Vertical component of velocity C
) Horizontal component of velocity D

Question # 17

The time of flight of a projectile is maximum when angle of projection is:

30 Degree A
45Degree B
60Degree C
90Degree D

Question # 18

At the highest point on the trajectory of a projectile, its

Potential energy is minimum A
Kinetic energy is maximum B
Total energy is maximum C
Kinetic energy is minimum D

Question # 19

Two astronauts in a satellite must have

Same masses A
Same real weights B
Same apparent weights C
None of these D

Question # 20

Vertical component of velocity of the projectile at any instant ‘t’ from the ground is given by:

𝑣𝑖𝑐𝑜𝑠𝜃 A
𝑣𝑖𝑐𝑜𝑠𝜃 − 𝑔t B
𝑣𝑖𝑠𝑖𝑛𝜃 − 𝑔t C
𝑣𝑖𝑠𝑖𝑛𝜃 + 𝑔t D

Sr.#	Question	Answer
1	If velocity time graph is a straight line parallel to time axis then body is	A. Moving with zero acceleration B. Moving with constant velocity C. Covering equal displacement in equal intervals of time D. All of these
2	Two bodies are projected at angle 𝜽 𝒂𝒏𝒅 (𝟗𝟎 − 𝜽) to the horizontal with the same speed. The ratio of their times of flight is:	A. sin 𝜃 : 1 B. cos 𝜃 : 1 C. sin 𝜃 : cos𝜃 D. cos 𝜃 : sin𝜃
3	A body is in translational equilibrium if	A. P = 0 B. L = 0 C. F = 0 D.  = 0
4	Speedometer of an automobile measures	A. Average velocity B. Instantaneous velocity C. Acceleration D. Instantaneous speed
5	In a one-dimensional elastic collision, the relative velocity of approach before collision is equal to:	A. Sum of the velocities of the bodies B. e times the relative velocity of separation after collision C. 1⁄𝑒 times the relative velocity of separation after collision D. relative velocity of separation after collision
6	A machine gun fires ‘n’ bullets per second and the mass of each bullet is m. If v is the speed of each bullet then the force exerted on the machine gun is:	A. mng B. mnv C. mnvg D. mnv/g
7	Two 8 N forces act on each end of the beam of length 0.60m. Two forces are parallel and acting opposite to each other, the angle between the force and beam is 60o , what is the torque of the couple exerted on the beam:	A. 2.4 Nm B. 4.2 Nm C. 4.8 Nm D. 9.6 Nm
8	The angular momentum of a body changes from 30 J-S to 50 J-S in 0.5 sec. The torque acting on it is	A. 40 N-m B. 100 N-m C. 50 N-m D. 150 N-m
9	A particle executing one dimensional motion, finally comes to rest, what will be the angle between acceleration and displacement during motion:	A. 0 B. π C. 𝜋/2 D. 𝜋/4
10	In the absence of air resistance, a stone is thrown from P and follows a parabolic path in which the highest point reached is T. The vertical component of acceleration of stone is:	A. Zero at T B. Greatest at T C. ) Greatest at P D. the same at P as at T

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