A particle is on a smooth horizontal plane. A force F is applied, whose F-t graph is given.

Consider the following statements.
a. At time t1, acceleration is constant.
b. Initially the particle must be at rest.
c. At time t2, acceleration is constant.
d. The initial acceleration is zero.
Select the correct statement(s):

1. (a), (c) 2. (a), (b), (d)
3. (c), (d) 4. (b), (c)

Subtopic:  Newton's Laws |
 57%
From NCERT
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A coin placed on a rotating table just slips if it is placed at a distance 4r from the center. On doubling the angular velocity of the table, the coin will just slip when the distance from the centre is equal to:-

1. 4r

2. 2r

3. r

4. r4

Subtopic:  Uniform Circular Motion |
 68%
From NCERT
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A massless string of length 1 m fixed at one end carries a mass of 2 kg at the other end. The string makes 2π rev/s around the axis through the fixed end as shown in the figure. The tension on the string will be:
            

1. 32 N 2. 3 N
3. 16 N 4. 4 N
Subtopic:  Uniform Circular Motion |
 69%
From NCERT
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Three blocks A, B and C of mass 3M, 2M and M respectively are suspended vertically with the help of springs PQ and TU and a string RS as shown in fig. The acceleration of blocks A, B and C are a1,a2 and a3 respectively.
     

The value of acceleration \(a_{1}\) at the moment string RS is cut will be: 

1. g downward

2. g upward

3. more than g downward

4. zero

Subtopic:  Spring Force |
 69%
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Two bodies of mass, \(4~\text{kg}\) and \(6~\text{kg}\), are tied to the ends of a massless string. The string passes over a pulley, which is frictionless (see figure). The acceleration of the system in terms of acceleration due to gravity (\(g\)) is:

            

1. \(\frac{g}{2}\) 2. \(\frac{g}{5}\)
3. \(\frac{g}{10}\) 4. \(g\)

Subtopic:  Application of Laws |
 83%
From NCERT
NEET - 2020
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If μ between block A and inclined plane is 0.5 and that between block B and the inclined plane is 0.8, then the normal reaction between blocks A and B will be:
                     
1. 180 N

2. 216 N

3. 0

4. None of these

Subtopic:  Friction |
 56%
From NCERT
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If a young man of mass 60 kg stands on the floor of a lift which is accelerating downwards at 1 m/s2, then the reaction of the floor of the lift on the man will be: (g=9.8m/s2)

1. 528 N 2. 540 N
3. 546 N 4. None of these
Subtopic:  Application of Laws |
 73%
From NCERT
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In the diagram, a 100 kg block is moving up with constant velocity. Find out the tension at point P.

      

1. 1330 N

2. 490 N

3. 1470 N

4. 980 N

Subtopic:  Tension & Normal Reaction |
From NCERT
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Calculate the reading of the spring balance shown in the figure: (Take \(g=10\) m/s2)
                

1. \(60\) N
2. \(40\) N
3. \(50\) N
4. \(80\) N

Subtopic:  Spring Force |
 58%
From NCERT
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An object of mass m is held against a vertical wall by applying horizontal force F as shown in the figure. The minimum value of the force F will be: (Consider friction between wall and object.)

   
1. Less than mg
2. Equal to mg
3. Greater than mg
4. Cannot determine

Subtopic:  Friction |
 53%
From NCERT
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