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# MCQ : Force And Laws Of Motion - 2 - UPSC

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## 20 Questions MCQ Test Science & Technology for UPSC CSE - MCQ : Force And Laws Of Motion - 2

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MCQ : Force And Laws Of Motion - 2 - Question 1

### An unbalanced force is necessary for an object to be

MCQ : Force And Laws Of Motion - 2 - Question 2

### Bags at the top of a school van are tied using a string to avoid the effect of

MCQ : Force And Laws Of Motion - 2 - Question 3

### Inertia

MCQ : Force And Laws Of Motion - 2 - Question 4

A plate, a ball and a child all have the same mass. The one having more inertia is the

MCQ : Force And Laws Of Motion - 2 - Question 5

A passenger in a moving train tosses a coin which falls behind him. It means that the motion of the train is

MCQ : Force And Laws Of Motion - 2 - Question 6

Two equal masses m each moving in the opposite direction with the same speed v collide and stick to each other. The velocity of the combined mass is

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 6

Total initial momentum = Total final momentum = zero

MCQ : Force And Laws Of Motion - 2 - Question 7

The rate of change of momentum with respect to time is measured in

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 7

We know,  p = mv
Units of p, ⇒ kg ms-1
We have to measure, rate of change of momentum with respect to time ;
⇒  kg m s-2

MCQ : Force And Laws Of Motion - 2 - Question 8

The incorrect option regarding action-reaction pair is

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 8

Since, action and reaction forces are equal in magnitude and opposite in directions. Therefore, there resultant is zero.

MCQ : Force And Laws Of Motion - 2 - Question 9

A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 9

A large force that acts in a very short duration of time is reffered to as impulsive force. This force which is large due to a high speed such as kick of a football may be disastrous as the momentum change is large and hence a goalkeeper holds his hand backwards in order to reduce the force exerted on his hands.

MCQ : Force And Laws Of Motion - 2 - Question 10

If force, change in momentum and time are given by F, p and t respectively, then they are related b

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 10

The rate at which an object’s momentum changes is equal to the force acting on the object. If a force F acts on an object for a time Δt, then the change in the object's momentum is Δp = FΔt.

MCQ : Force And Laws Of Motion - 2 - Question 11

According to Newton’s third law of motion, action and reaction

MCQ : Force And Laws Of Motion - 2 - Question 12

The minimum number of unequal forces that can make zero resultant is

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 12

Three vectors of unequal magnitude which can be represented by the three sides of a triangle taken in order, produce zero resultant.

MCQ : Force And Laws Of Motion - 2 - Question 13

An object of mass 2 kg is sliding with a constant velocity of 4 ms-1 on a frictional horizontal table. The force required to keep the object moving with same velocity is

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 13

From newton's Ist law of motion, since there is no external force acting on the object it will remain in its original state of motion. Hence, zero force is required to keep the object moving with constant velocity.

MCQ : Force And Laws Of Motion - 2 - Question 14

A mass M breaks into two pieces in the ratio 1 : 3 while at rest. If the heavier has a speed of v, the speed of the lighter is

MCQ : Force And Laws Of Motion - 2 - Question 15

An object of mass of 2 kg is sliding with a velocity of 4 ms-1 on a frictional horizontal surface. The retarding force necessary to stop the object in 1 second is

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 15

Here, u = 0 m /s
a  = v- u / t
=>  0-4/1 = > -4.
Formula of regarding force remains same.
F = - ma. ( negative sign comes due to  restarting  acceleration.)
Therefore,  F = - 2* (-4)
F  =  8 N

MCQ : Force And Laws Of Motion - 2 - Question 16

The two states of motion treated alike by the Newton’s first law, among A, B, C and D are
A : Rest
B : Uniform motion
C : Uniformly accelerated
D : Non-uniformly accelerated

MCQ : Force And Laws Of Motion - 2 - Question 17

Passengers standing in a bus are thrown outwards when the bus takes a turn suddenly. This happens because of

MCQ : Force And Laws Of Motion - 2 - Question 18

When a 12 N force acts on 3 kg mass for a second, the change in velocity is (in m/s)

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 18 MCQ : Force And Laws Of Motion - 2 - Question 19

A force of ‘P* N acts on a particle so as to accelerate it from rest to a velocity 'v' m/s. The force 'P’ is then replaced by ‘Q’ N which decelerates it to rest.

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 19

To decelerate a body, a force must be applied opposite to the direction of velocity, irrespective of its magnitude.
According to the condition of motion under two forces P and Q must be acting in opposite directions and may be equal, not necessarily must be equal.

MCQ : Force And Laws Of Motion - 2 - Question 20

Which of the following does not happen? As an automobile accelerates suddenly,

Detailed Solution for MCQ : Force And Laws Of Motion - 2 - Question 20

When a vehicle accelerates and suddenly applies a break we possess what we call inertia. And when it suddenly applies a break we tend to retain that Velocity so we fall backwards thus satisfying the law of inertia or what is also called Newton's first law of motion.

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