In the figure, the coefficient of friction between the floor and body B is 0.1. The coefficient of friction between bodies B and A is 0.2. A force F is applied as shown on B. The mass of A is rn/2 and of B is m.

(a) The bodies will move together if F = O .25 mg
(b) The A will slip with B if F = 0.5 mg
(c) The bodies will move together if F = 0.5 mg
(d) The bodies will be at rest if F = 0.1 mg
(e) The maximum value of F for which the two bodies will move together is 0.45 mg

Which of the following statement(s) is/are true?

1. (a, b, d, e)

2. (a, c, d, e)

3. (b, c, d)

4. (a, b, c)

Subtopic:  Application of Laws | Friction |
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The figure shows the position-time graph of a particle of mass 4 kg. What is the force on the particle for t > 4 s?  (Consider one-dimensional motion only).

1. 0

2. 40 N

3. 20 N

4. 10 N

Subtopic:  Application of Laws |
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Assertion: A man who falls from a height on a cement floor receives more injury than when he falls from the same height on a heap of sand. 
Reason: The impulse applied by a cement floor is less than the impulse applied by a sand floor.
1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.

 
Subtopic:  Application of Laws |
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Assertion: A rocket moves forward by pushing the surrounding air backward.
Reason: It derives the necessary thrust to move forward according to Newton's first law of motion.

1. Both assertion and reason are true and the reason is the correct explanation of the assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of the assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.

 
Subtopic:  Application of Laws |
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Assertion: A rocket works on the principle of conservation of linear momentum.
Reason: Higher is the velocity, smaller is the pressure and vice-versa.
 
1. Both assertion and reason are true and the reason is the correct explanation of assertion.
2. Both assertion and reason are true but the reason is not the correct explanation of assertion.
3. Assertion is true but the reason is false.
4. Both assertion and reason are false.
 
Subtopic:  Application of Laws |
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Assertion: The driver in a vehicle moving at a constant speed on a straight road is in a non-inertial frame of reference.
Reason: A reference frame in which Newton's law of motion is applicable is non-inertial.

1. Both assertion & reason are true and the reason is the correct explanation of the assertion
2. Both assertion & reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false.
4. Both assertion and reason are false statements.
 
Subtopic:  Application of Laws |
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Assertion: A man in a closed cabin, which is falling freely, does not experience gravity.
Reason: Inertial and gravitational mass have equivalence.

1. Both assertion & reason are true and the reason is the correct explanation of the assertion
2. Both assertion & reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false.
4. Both assertion and reason are false statements.
Subtopic:  Application of Laws |
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Assertion: The principle of rocket propulsion is a special case of a variable mass system.
Reason: The principle of rocket propulsion can be explained by Newton's second law.

1. Both assertion & reason are true and the reason is the correct explanation of the assertion
2. Both assertion & reason are true but the reason is not the correct explanation of the assertion
3. Assertion is true but the reason is false.
4. Both assertion and reason are false statements.
 
Subtopic:  Application of Laws |
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