One end of a uniform wire of length L and of weight W is attached rigidly to a point in the roof and a weight W1 is suspended from its lower end. If A is the area of cross-section of the wire , the stress in the wire at a height 3L/4 from its lower end is :-
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe bulk modulus of water is . The increase in pressure required to decrease the volume of water sample by 0.1% is:-
1. \(4\times 10^{6}N/m^{2}\)
2. \(2\times 10^{6}N/m^{2}\)
3. \(2\times 10^{8}N/m^{2}\)
4. \(8\times 10^{6}N/m^{2}\)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTo break a wire, a force of is required. If the density of the material is , then the length of the wire which will break by its own weight will be:
1. 34 m
2. 30 m
3. 300 m
4. 3 m
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe length of elastic string, obeying Hooke's law is metres when the tension is 4N, and metres when the tension is 5N. The length in metres when the tension is 0N will be-
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyTwo wires are made of the same material and have the same volume. The first wire has a cross-sectional area A and the second wire has a cross-sectional area 3A. If the length of the first wire is increased by on applying a force F, how much force is needed to stretch the second wire by the same amount?
1. 9F
2. 6F
3. 4F
4. F
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyCopper of fixed volume 'V' is drawn into a wire of length 'l'. When this wire is subjected to a constant force 'F', the extension produced in the wire is 'Δl'. Which of the following graph is a straight line?
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyOverall changes in volume and radius of a uniform cylindrical steel wire are 0.2% and 0.002% respectively when subjected to some suitable force. Longitudinal tensile stress acting on the wire is:
()
1.
2.
3.
4. 3.9
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA 1000 kg lift is tied with metallic wires of maximum safe stress of 1.4 108 N m-2. If the maximum acceleration of the lift is 1.2 m s-2, then the minimum diameter of the wire is:
1. 1 m
2. 0.1 m
3. 0.01 m
4. 0.001 m
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA wire can sustain a weight of 10 kg before breaking. If the wire is cut into two equal parts, then each part can sustain a weight of:
1. 2.5 kg
2. 5 kg
3. 10 kg
4. 15 kg
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA uniform cylinder rod of length L, cross-sectional area A and Young's modulus Y is acted upon by the forces, as shown in the figure. The elongation of the rod is:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology