Q. No.A \(60\) kg man pushes a \(40\) kg man by a force of \(60\) N. The \(40\) kg man has pushed the other man with a force of:
1. \(40\) N
2. \(0\)
3. \(60\) N
4. \(20\) N
Which of the following systems may be adequately described by classical physics?
| a. | motion of a cricket ball |
| b. | motion of a dust particle |
| c. | a hydrogen atom |
| d. | a neutron changing to a proton |
Choose the correct option:
| 1. | (a) and (b) |
| 2. | (b) and (c) |
| 3. | (c) and (d) |
| 4. | (a) and (d) |
Action and reaction
(a) act on two different objects
(b) have equal magnitude
(c) have opposite directions
(d) have resultant zero
Choose the correct option:
1. (a) and (b)
2. (b) and (c)
3. (a), (b) and (c)
4. All of these
A body of weight \(\mathrm{w}_{1}\) is suspended from the ceiling of a room through a chain of weight \(\mathrm{w}_{2}.\)The ceiling pulls the chain by a force:
1. \(\mathrm{w}_{1}\)
2. \(\mathrm{w}_{2}\)
3. \(\mathrm{w}_{1}+\mathrm{w}_{2}\)
4. \(\frac{\text w_{1}+\text w_{2}}{2}\)
When a horse pulls a cart, the force that helps the horse to move forward is the force exerted by:
| 1. | the cart on the horse. |
| 2. | the ground on the horse. |
| 3. | the ground on the cart. |
| 4. | the horse on the ground. |
Neglect the effect of rotation of the earth. Suppose the earth suddenly stops attracting objects placed near its surface. A person standing on the surface of the earth will:
| 1. | fly up |
| 2. | slip along the surface |
| 3. | fly along a tangent to the earth’s surface |
| 4. | remain standing |
A force F1 acts on a particle so as to accelerate it from rest to a velocity v. The force F1 is then replaced by F2 which decelerates it to rest.
1. F1 must be equal to F2
2. F1 may be equal to F2
3. must be unequal to F2
4. none of these
Two objects \(A\) and \(B\) are thrown upward simultaneously with the same speed. The mass of \(A\) is greater than the mass of \(B\). Suppose the air exerts a constant and equal force of resistance on the two bodies.
| 1. | the two bodies will reach the same height. |
| 2. | \(A\) will go higher than \(B\). |
| 3. | \(B\) will go higher than \(A\). |
| 4. | any of the above three may happen depending on the speed with which the objects are thrown. |
A person says that he measured the acceleration of a particle to be nonzero while no force was acting on the particle.
| 1. | he is a liar |
| 2. | his clock might have run slow |
| 3. | his meter scale might have been longer than the standard |
| 4. | he might have used a non-inertial frame |
Consider the following two statements
| A: | The linear momentum of a particle is independent of the frame of reference. |
| B: | The kinetic energy of a particle is independent of the frame of reference. |
| 1. | Both A and B are true |
| 2. | A is true but B is false |
| 3. | A is false but B is true |
| 4. | Both A and B are false |
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