Strength of Materials

201. The coefficient of friction depends upon

1. Nature of surfaces
2. Area of contact
3. Shape of the surfaces
4. All of the above

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202. The cross sections of the beams of equal length are a circle and a square whose permissible bending stress is same under same maximum bending. The ratio of their flexural weights is,

1. 1.118
2. 1.338
3. 1.228
4. 1.108

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203. The deflection due to couple M at the free end of a cantilever length L is

1. ML/EI
2. 2ML/EI
3. ML²/2EI
4. M²L/2EI

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204. The deflection of any rectangular beam simply supported, is

1. Directly proportional to its weight
2. Inversely proportional to its width
3. Inversely proportional to the cube of its depth
4. Directly proportional to the cube of its length

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205. The distance between the centres of adjacent rivets in the same row, is called

1. Pitch
2. Lap
3. Gauge
4. Staggered pitch

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206. The effect of arching a beam, is

1. To reduce the bending moment throughout
2. To increase the bending moment throughout
3. Nothing on the bending throughout
4. All the above

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207. The energy stored in a beam of length subjected to a constant B.M. is

1. M²L/2EI
2. ML²/2EI
3. M²L/EI
4. ML²/EI

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208. The equivalent length of a column fixed at both ends, is

1. 0.5 l
2. 0.7 l
3. l
4. 1.5 l

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209. The equivalent length of a column fixed at one end and free at the other end, is

1. 0.5 l
2. 0.7 l
3. 2 l
4. 1.5 l

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210. The following assumption is not true in the theory of pure torsion:

1. The twist along the shaft is uniform
2. The shaft is of uniform circular section throughout
3. Cross-section of the shaft, which is plane before twist remains plane after twist
4. All radii get twisted due to torsion

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