Given that the breaking stress of a wire is 7.2 x 107 N/ m2 and its density is 7.2 g/cc, then the maximum length of the wire which can hang without breaking is: (g = 10 m/s2)

(1) 1000 m

(2) 100 m

(3) 200 m

(4) 50 m

Subtopic:  Stress - Strain |
 69%
From NCERT
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Work done in increasing the length of a 1 m long wire by 1 mm is 10 J. Work done in increasing the length further by 1 mm is:

(1) 10 J

(2) 20 J

(3) 30 J

(4) 40 J

Subtopic:  Potential energy of wire |
From NCERT
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If the pressure of a gas is increased from 1.04 x 105 Pa to 1.045 x 105 Pa and volume is decreased by 5% at a constant temperature, then the Bulk modulus of the gas is:

(1) 1.0425 x 105 Pa

(2) 1.045 x 105 Pa

(3) 104 Pa

(4) 2.5 x 104 Pa

Subtopic:  Shear and bulk modulus |
 78%
From NCERT
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The breaking strength of the iron wire of radius r and length l is 2 x 106 N/m2. Breaking strength of another iron wire of radius r, and length l at the same temperature will be:

(1) 0.5 x 106 N/m2

(2) 1 x 106 N/m2

(3) 2 x 106 N/m2

(4) 8 x 106 N/m2

Subtopic:  Elasticity |
 88%
From NCERT
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The stress-strain curve for two materials A and B are as shown in the figure. Select the correct statement:

       
 

1. Material A is less brittle and less elastic as compared to B
2. Material A is more ductile and less elastic as compared to B
3. Material A is less brittle and more elastic than B
4. Material B is more brittle and more elastic than A

Subtopic:  Stress - Strain Curve |
 67%
From NCERT
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A material has Poisson's ratio of 0.5 and  If a uniform rod of it suffers a longitudinal strain of 4 x 10-6, then the percentage change in its volume will be

(1) 2%

(2) 8%

(3) 0%

(4) 4%

Subtopic:  Poisson's Ratio |
 59%
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Select the incorrect statement about Bulk modulus of elasticity.

(1) It is defined for solids, liquids and gases.

(2) Bsolid > Bliquid > Bgas

(3) The bulk modulus of gas is different for different processes.

(4) Almost for all materials, the Bulk modulus increases with the rise in temperature.

Subtopic:  Shear and bulk modulus |
 63%
From NCERT
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The Poisson's ratio of a material is 0.5, then YB is: (Y is Young's modulus, B is Bulk modulus)

(1) 5

(2) 3

(3) Zero

(4) Infinite

 

Subtopic:  Poisson's Ratio |
 68%
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The Young's modulus of a wire is numerically equal to the stress at a point when:

1. the strain produced in the wire is equal to unity.
2. the length of the wire gets doubled.
3. the length increases by 100%.
4. All of these

Subtopic:  Young's modulus |
 73%
From NCERT
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Practical value of Poisson's ratio lies between:

(1) -1 to 0.5

(2) -0.5 to 1

(3) 0 to 0.5

(4) 0 to 1

Subtopic:  Poisson's Ratio |
 71%
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