Newton's Laws and Motion

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What happens to the mass of a body when its velocity is comparable to the velocity of light?

It increases (correct)

It becomes zero

It remains the same as its rest mass

It decreases

What is the condition for a system or a body to be in equilibrium?

The net force acting on it is zero (correct)

The net force acting on it is minimum

The net force acting on it is infinite

The net force acting on it is maximum

What is the relationship between inertia and mass of a body?

Inertia is directly proportional to the mass of the body (correct)

Inertia is unrelated to the mass of the body

Inertia is inversely proportional to the mass of the body

Inertia is proportional to the velocity of the body

What is the consequence of a force acting on a body?

The body undergoes acceleration (C) Signup and view all the answers

What is the result of placing a weight W in X Pan and a weight W1 in Y Pan in a physical balance?

The balance becomes balanced (B) Signup and view all the answers

What is the primary reason why a person does not experience any jerk when the bus is in motion?

The entire body of the person is in motion with the bus (C) Signup and view all the answers

What is the main reason why the rider tends to fall backward when a horse starts suddenly?

The inertia of rest of the upper part of the body (C) Signup and view all the answers

Why does a bullet fired on a window pane make a clean hole through it, while a ball breaks the whole window?

The bullet has a higher speed than the ball (B) Signup and view all the answers

What is the reason why a stone tied to a string flies off along the tangent to the circle when the string breaks?

The stone's inertia of motion (C) Signup and view all the answers

What is the inability of a body to change by itself its direction of motion?

Inertia of direction (C) Signup and view all the answers

What is the effect of velocity on the length of a rod according to the special theory of relativity?

The length of the rod decreases with an increase in velocity (D) Signup and view all the answers

According to the special theory of relativity, what happens to the mass of a body as its velocity increases?

The mass of the body increases with an increase in velocity (B) Signup and view all the answers

What is the effect of motion on the clock rate according to the special theory of relativity?

The clock rate decreases with motion (C) Signup and view all the answers

What is the condition for rotational equilibrium about a point 'O' in a physical balance?

Xa = Yb (B) Signup and view all the answers

What type of balance is it when the masses of the pans are not equal?

False balance (B) Signup and view all the answers

What is the force acting on a rope when a person climbs up or down with uniform speed?

mg (D) Signup and view all the answers

What is the acceleration of a body moving down a smooth inclined plane of length l, height h and having angle of inclination θ?

g sin θ (B) Signup and view all the answers

What is the velocity of a body at the bottom of an inclined plane?

√(2gl sinθ) (B) Signup and view all the answers

Where do action and reaction forces act?

Along the line joining the centres of two bodies (C) Signup and view all the answers

What is the result of a falling object not falling straight down?

The earth's rotation causes the object to deflect (B) Signup and view all the answers

A block of mass m is accelerating on a smooth inclined plane. If the force acting on the block is F, what is the acceleration of the block?

F / m (A) Signup and view all the answers

Two blocks, one of mass m1 and the other of mass m2, are connected by a massless string and are on a smooth horizontal surface. If the system is accelerating, what is the tension in the string between the blocks?

(m1 + m2) * a (C) Signup and view all the answers

A massive pulley of mass M and radius R is rotating about its axis with an angular acceleration α. What is the net torque acting on the pulley?

M * R * α (A) Signup and view all the answers

A string of mass M is stretched between two points. If the force applied to one end of the string is F, what is the acceleration of the block at the other end?

F / M (D) Signup and view all the answers

A block of mass m is attached to a horizontal, massless spring of spring constant k. If the block is displaced and then released, what is the acceleration of the block?

-k / m (A) Signup and view all the answers

What is the primary characteristic of a body in equilibrium?

The net force acting on it is zero. (C) Signup and view all the answers

What is the relationship between the force applied to a body and its resulting acceleration?

The acceleration is directly proportional to the force. (A) Signup and view all the answers

What is the unit of force in the CGS system?

Dyne (B) Signup and view all the answers

What is the consequence of a force acting on a body in terms of its momentum?

The momentum of the body changes. (A) Signup and view all the answers

What is the direction of the force exerted by a rocket on its exhaust gases?

Backward, opposite to the direction of motion. (C) Signup and view all the answers