Mechanical Properties of Solids

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Question

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Question 1 : A body of mass 1 kg is attached to one end of a wire and rotated in horizontal circle of diameter 40 cm with a constant speed of 2 m/s. what is the area of cross-section of the wire if the stress developed in the wire is 5 × 106 N/m²?
1. 2 mm²
2. 3 mm²
3. 4 mm²
4. 5 mm²
Answer
8300

Question 2 : In a wire, when elongation is 2 cm energy stored is E. if it is stretched by 10 cm, then the energy stored will be
1. E
2. 2 E
3. 4 E
4. 25 E
Answer
8301

Question 3 : Two wires A and B are of the same length. The diameters are in the ratio 1 : 2 and the Youngs modulus are in ratio 2 : 1. if they are pulled by the same force, then their elongations will be in ratio
1. 4 : 1
2. 1 : 4
3. 1 : 2
4. 2 : 1
Answer
8302

Question 4 : Hookes law essentially defines
1. Stress
2. Strain
3. Yield point
4. Elastic limit
Answer
8303

Question 5 : Longitudinal strain is possible in the case of
1. Gases
2. Liquid
3. Only solids
4. Only gases & liquids
Answer
8304