Breaking stress of a steel wire of length L and radius r is F. If its radius is doubled and length is halved, its new breaking stress will be:

(1) 2F

(2) F

(3) F/2

(4) 4F

Subtopic:  Stress - Strain |
 60%
From NCERT
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Compressed rubber ball has:

(1) decreased potential energy.

(2) increased potential energy.

(3) decreased kinetic energy.

(4) increased kinetic energy.

Subtopic:  Elasticity |
 74%
From NCERT
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Stress vs strain graphs for two different wires \(A\) and \(B\) are given. If \(Y_A\) and \(Y_B\) are Young's moduli of the materials, then:
                
  

1. \( \mathrm{Y}_{\mathrm{A}}=\sqrt{3} \mathrm{Y}_{\mathrm{B}} \)
2. \( \sqrt{3} \mathrm{Y}_{\mathrm{A}}=\mathrm{Y}_{\mathrm{B}} \)
3. \( \mathrm{Y}_{\mathrm{A}}=3 \mathrm{Y}_{\mathrm{B}} \)
4. \( 3 \mathrm{Y}_{\mathrm{A}}=\mathrm{Y}_{\mathrm{B}} \)

Subtopic:  Stress - Strain Curve |
 76%
From NCERT
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Hooke's Law is obeyed within:

(1) Elastic limit

(2) Proportionality limit

(3) Breaking point

(4) Freezing point

Subtopic:  Hooke's Law |
From NCERT
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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%
From NCERT
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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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