Test: Forces And Laws Of Motion - 5


25 Questions MCQ Test General Science for UPSC (Civil Services) Prelims | Test: Forces And Laws Of Motion - 5


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QUESTION: 1

An external influence which changes or tends to change the state of rest or uniform motion of body or its
dimensions is called :

Solution:
QUESTION: 2

Equal and opposite forces acting on a body which do not change its state of rest or uniform motion are called:

Solution:
QUESTION: 3

The unequal and opposite forces acting on a body, which change its state of rest or uniform motion are called:

Solution: Unequal and opposite means unequal in magnitude and opposite in direction.
QUESTION: 4

Force of friction always acts in the direction:

Solution:
QUESTION: 5

When balanced forces act on a body, the body:

Solution:
QUESTION: 6

When unbalanced forces act on a body, the body:

Solution: The Second Law of Motion states that if an unbalanced force acts on a body, that body will experience acceleration ( or deceleration), that is, a change of speed.
 One can say that a body at rest is considered to have zero speed, ( a constant speed). So any force that causes a body to move is an unbalanced force. Also, any force, such as friction, or gravity, that causes a body to slow down or speed up, is an unbalanced force. 

QUESTION: 7

If no external force acts on a body, it will :

Solution:
QUESTION: 8

If a body is allowed ti freely fall from a height, its speed increases continuously. It is because:

Solution:
QUESTION: 9

A force of magnitude' F' acts on a body of mass 'm'. The acceleration of the body depends upon:

Solution:
QUESTION: 10

Force remaining constant, if the mass of body increases, its acceleration is likely to :

Solution:
QUESTION: 11

A force F produces an acceleration 'a' in a body. The same force produces and acceleration 4a in another
body. The mass of other body is :

Solution:
QUESTION: 12

When a running motorbike accelerates suddenly, the pillion rider has a tendency to fall backward. This is an example of:

Solution:
QUESTION: 13

A force F acts on a stationary body for the time t. The distance covered by the body 'S' will be proportional to:

Solution: S=ut+1/2at^2 Since the mass is constant, and i guess you dont mean above to be dealt in relativistic speed, and a constant force is applied then we will have constant acceleration. So distance covered will be only dependent on elapsed time t.So s ∝ t^2
QUESTION: 14

The impact which a body can produce due to the combined effect of mass and velocity is called:

Solution:

Mass ad velocity both are considered to be quantities which defines motion.

The combination of both is called quantity of motion. It is momentum.

P = mv

QUESTION: 15

The SI unit of momentum is :

Solution:
QUESTION: 16

The tendency of a body to continue in its state of rest or uniform motion, even on the application of external force is called:

Solution:
QUESTION: 17

A body will continue in its state of rest or uniform motion in a straight line, unless acted by some external force. The statement represents :

Solution: Body is in the motion it tends to be in motion and when a body is in the rest it tends to be in rest unless and external force is not applied on it.
QUESTION: 18

The magnitude of inertia of a body is determined by its:

Solution:
QUESTION: 19

Momentum is a:

Solution:

Momentum is a vector quantity. For a particle with mass, the momentum equals mass times velocity, and velocity is a vector quantity while mass is a scalar quantity. A scalar multiplied by a vector is a vector. A moving body would be a particle with a mass.

QUESTION: 20

A body P has mass 2 m and velocity 5 v. Another body Q has mass 8 m and velocity 1.25 v. The ratio of momentum of P and Q is :

Solution:
Momentum = mass x velocity  
Therefore in first case momentum = 2m x 5v = 10mv
​Therefore in second case momentum = 8m x 1.25v = 10mv
​Thus in both the cases momentum is the same, so, Ratio is 1:1
QUESTION: 21

The magnitude of a physical quantity is 8.5 Ns. The physical quantity is :

Solution: The newton second (also newton-second, symbol N s or N·s) is the derived SI unit of impulse. It is dimensionally equivalent to the momentum unit kilogram metre per second (kg·m/s). One newton second corresponds to a one-newton force applied for one second. Derivation- p=mv =kg×m/s =kgm/s×s/s =kgm/s^2×s =N×s
QUESTION: 22

There is a rubber ball and a stone ball of same size. If both balls are at rest:

Solution:
QUESTION: 23

When we vigorously a shake branch of a tree, some leaves get detached. It is due to the:

Solution:
QUESTION: 24

When the driver of a fast moving car suddenly applies brakes, the passengers in the car:

Solution:
QUESTION: 25

Which is the incorrect statement? A spaceship continues moving in space with uniform speed because:

Solution: A spaceship continues moving in space with uniform speed because no force of gravitation acts on it but not it's mass is zero in space and everything in the space appear to be floating that is why the astronauts also appear to float in space but their mass is not zero actually.

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