The breaking stress of a wire depends upon:
1. material of the wire.
2. length of the wire.
3. radius of the wire.
4. shape of the cross-section.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThree wires A, B, C made of the same material and radius have different lengths. The graphs in the figure show the elongation-load variation. The longest wire is
1. A
2. B
3. C
4. All
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe bulk modulus of a spherical object is B. If it is subjected to uniform pressure P, the fractional decrease in radius will be:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe Young's modulus of steel is twice that of brass. Two wires of the same length and of the same area of cross-section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weight added to the steel and brass wires must be in the ratio of:
1. 1:2
2. 2:1
3. 4:1
4. 1:1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology The area of cross-section of a wire of length 1.1 metre is 1 It is loaded with mass of 1 kg. If Young's modulus of copper is then the increase in length will be (If )
1. 0.01 mm
2. 0.075 mm
3. 0.1 mm
4. 0.15 mm
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyIn the CGS system, Young's modulus of a steel wire is 2×1012 dyne/cm2. To double the length of a wire of unit cross-section area, the force required is:
1. 4×106 dynes
2. 2×1012 dynes
3. 2×1012 newtons
4. 2×108 dynes
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA force F is needed to break a copper wire having radius R. The force needed to break a copper wire of radius 2R will be:
1. F/2
2. 2F
3. 4F
4. F/4
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySteel and copper wires of the same length and area are stretched by the same weight one after the other. Young's modulus of steel and copper are The ratio of increase in length is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo wires of copper having length in the ratio of 4: 1 and radii ratio of 1: 4 are stretched by the same force. The ratio of longitudinal strain in the two will be:
1. 1: 16
2. 16: 1
3. 1: 64
4. 64: 1
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyOn applying stress of N/, the length of a perfectly elastic wire is doubled. It's Young’s modulus will be:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology