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 |
 73%
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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The ratio of Young's modulus of wire A to wire B is:

                    

1. \(3:1\)
2. \(1:3\)
3. \(\sqrt{3}:1\)
4. \(1: \sqrt{3}\)

Subtopic:  Stress - Strain Curve |
 56%
From NCERT
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Given below are two statements: 

Statement I: Rubber is more elastic than steel.
Statement II: Deformation in steel is less than rubber for equal forces
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.
Subtopic:  Elasticity |
 72%
From NCERT
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Given below are two statements: 

Assertion (A): Hooke's law is applicable up to the elastic limit.
Reason (R): Up to the elastic limit, stress is directly proportional to strain.
  
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Hooke's Law |
From NCERT
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Given below are two statements: 

Statement I: Air is more elastic than iron.
Statement II: Elasticity is directly proportional to Bulk modulus and the Bulk modulus of air is more than that of steel.
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.
Subtopic:  Elasticity |
From NCERT
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Given below are two statements: 

Statement I: Almost for all metals, the modulus of elasticity decreases with a rise in temperature.
Statement II: By increasing temperature, the intermolecular force decreases.
 
1. Statement I is false but Statement II is true.
2. Both Statement I and Statement II are true.
3. Both Statement I and Statement II are false.
4. Statement I is true but Statement II is false.
Subtopic:  Elasticity |
From NCERT
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The Poisson's ratio of a material is \(0.4.\) If a force is applied to a wire of this material, there is a decrease in the cross-section area by \(2\)%. In such a case the percentage increase in its length will be:

1. \(3\)% 2. \(2.5\)%
3. \(1\)% 4. \(0.5\)%
Subtopic:  Poisson's Ratio |
 63%
From NCERT
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