The length of a wire is 2.01 m when 5 kg is hanging from it and 2.02 m when 10 kg is hanging, then the natural length of wire is:

(1) 2 m

(2) 1.95 m

(3) 1.9 m

(4) 2.005 m

Subtopic:  Young's modulus |
 70%
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Elongation in the wire of length L and Young's modulus of Y when blocks of weight W each are hung as shown below-

 

1.  WLAY

2.  2WLAY

3.  WL2AY

4.  14WLAY

Subtopic:  Young's modulus |
 51%
From NCERT
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A uniform rod suspended from the ceiling gets elongated by its weight. Which one of the following graphs represents the variation of elongation with length, \(L\)?

1. 2.
3. 4.
Subtopic:  Young's modulus |
 59%
From NCERT
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The diagrams represent the potential energy U as a function of interatomic separation r. Which of the following diagrams corresponds to stable molecules found in nature?

1.  

2.  

3.  

4.  

Subtopic:  Elasticity |
 72%
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The maximum load that a wire can bear is W. If the wire is cut to half of its length, then the maximum load it can sustain is:

1.  W4

2.  W3

3.  W2

4.  W

Subtopic:  Stress - Strain |
 72%
From NCERT
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Two wires \(X\) and \(Y\) of the same length are made of the same material. The figure represents the load \(F\) versus extension \(\Delta x\) graph for the two wires. Hence:

    

1. Modulus of elasticity of \(Y\) is greater than that of \(X\).
2. Stiffness of \(Y\) is more than that of \(X\).
3. The cross-sectional area of \(Y\) is less than that of \(X\).
4. All of these

Subtopic:  Stress - Strain Curve |
From NCERT
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When a helical spring is stretched, then the kind of strain produced in it is:

(1) Longitudinal

(2) shear

(3) Volumetric

(4) Longitudinal and Shear 

Subtopic:  Stress - Strain |
 63%
From NCERT
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If stress versus strain plot for a metal at two different temperatures T1 and T2 are shown below, then:

                            

1.  T1 > T2

2.  T1 < T2

3.  T1 = T2

4.  T1 = 1T2

Subtopic:  Stress - Strain Curve |
 61%
From NCERT
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A metallic rope of diameter \(1~ \text{mm}\) breaks at \(10 ~\text{N}\) force. If the wire of the same material has a diameter of \(2~\text{mm}\), then the breaking force is:

1. \(2.5~\text{N}\)  2. \(5~\text{N}\) 
3. \(20~\text{N}\)  4. \(40~\text{N}\) 

Subtopic:  Young's modulus |
 72%
From NCERT
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In which of the following cases, an elastic metal rod will not undergo elongation?

(1) The rod falls freely.

(2) It is pulled with constant acceleration on a smooth surface.

(3) It is pulled with constant velocity on a rough surface.

(4) All of these

Subtopic:  Stress - Strain |
From NCERT
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