Fundamentally, the normal force between two surfaces in contact is:

1. Electromagnetic

2. Gravitational

3. Weak nuclear force

4. Strong nuclear force

Subtopic:  Types of Forces |
From NCERT
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The pulleys and strings shown in the figure are smooth and of negligible mass. For the system to remain in equilibrium, the angle \(\theta\) should be: 
     
1. \(0^\circ\)
2. \(30^\circ\)
3. \(45^\circ\)
4. \(60^\circ\)

Subtopic:  Tension & Normal Reaction |
 83%
From NCERT
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A body of mass \(5\) kg is suspended by the strings making angles 60°and 30°with the horizontal.


Then:

a. T1=25 N                    
b. T2=25 N
c. T1=253 N               
d. T2=253 N
Choose the correct option:

1. (a),(b) 2. (a),(d)
3. (c),(d) 4. (b),(c)
Subtopic:  Tension & Normal Reaction |
 76%
From NCERT
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In the shown system, each of the block is at rest. The value of θ is:
        
1. tan-11

2. tan-134

3. tan-143

4. tan-135

Subtopic:  Tension & Normal Reaction |
 70%
From NCERT
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Three blocks with masses of m, 2m, and 3m are connected by strings as shown in the figure. After an upward force, F, is applied on block m, the masses move upward at a constant speed, v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity). 

 
1. 2mg 2. 3mg
3. 6mg 4. zero
Subtopic:  Tension & Normal Reaction |
 73%
From NCERT
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A mass M of 100 kg is suspended with the use of strings A, B and C as shown in the figure. The tension in the string B will be:
           
1. 100 g N 2. zero
3. \({100}\sqrt{2}\;{g}\;{N}\) 4. \(\frac{100}{\sqrt{2}}\;{g}\;{N}\)
Subtopic:  Tension & Normal Reaction |
 66%
From NCERT
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A metal sphere is suspended from a wall by a string. The forces acting on the sphere are shown in the figure. Which of the following statements is NOT correct?
   

1.

\(\vec N+\vec T+\vec W=0\)

2.  \(T^2=N^2+W^2\)
3.   \(T = N + W\) 4. \(N = W \tan \theta\)
Subtopic:  Tension & Normal Reaction |
 63%
From NCERT
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A man of mass \(60\) kg is standing on the ground and holding a string passing over a system of ideal pulleys. A mass of \(10\) kg is hanging over a light pulley such that the system is in equilibrium. The force exerted by the ground on the man is: (\(g=\) acceleration due to gravity)

         

1. \(20\) g
2. \(45\) g
3. \(40\) g
4. \(60\) g

Subtopic:  Tension & Normal Reaction |
 61%
From NCERT
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A string of negligible mass going over a clamped pulley of mass m supports a block of mass M as shown in the figure. The force on the pulley by the clamp is given by:
                 

1. 2Mg

2. 2mg

3. (M+m)2+m2g

4.(M+m)2+M2g

Subtopic:  Tension & Normal Reaction |
 52%
From NCERT
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What is the minimum value of force F such that at least one block leaves the ground in the given figure? (g = 10 m/s2)

             

1. 20 N, 2 kg leaves the ground first

2. 30 N, 3 kg leaves the ground first

3. 40 N, 2 kg leaves the ground first

4. 50 N, 3 kg leaves the ground first

Subtopic:  Tension & Normal Reaction |
From NCERT
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