Strength of Materials

161. Kinetic friction is the

1. Tangent of angle between normal reaction and the resultant of normal reaction and the limiting friction
2. Ratio of limiting friction and normal reaction
3. The friction force acting when the body is just about to move
4. The friction force acting when the body is in motion

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162. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction

1. Along the plane
2. Horizontally
3. Vertically
4. At an angle equal to the angle of friction to the inclined plane

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163. Limiting force of friction is the

1. Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
2. Ratio of limiting friction and normal reaction
3. The friction force acting when the body is just about to move
4. The friction force acting when the body is in motion

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164. Maximum deflection of a

1. Cantilever beam carrying a concentrated load W at its free end is WL³/3EI
2. Simply supported beam carrying a concentrated load W at mid-span is WL³/48EI
3. Cantilever beam, carrying a uniformly distributed load over span is WL³/8EI
4. All the above

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165. Maximum deflection of a cantilever due to pure bending moment M at its free end, is

1. ML²/3EI
2. ML²/4EI
3. ML²/6EI
4. ML²/2EI

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166. 'n' and 'j' are numbers of members and joints in a frame. It contains redundant members if

1. n = 2j - 3
2. n = 3j - 2
3. n < 2j - 3
4. n > 2j - 3

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167. On a ladder resting on smooth ground and leaning against vertical wall, the force of friction will be

1. Towards the wall at its upper end
2. Away from the wall at its upper end
3. Upwards at its upper end
4. Downwards at its upper end

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168. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be

1. Downwards at its upper end
2. Upwards at its upper end
3. Perpendicular to the wall at its upper end
4. Zero at its upper end

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169. Pick up the correct assumption of the theory of simple bending

1. The value of the Young's modulus is the same in tension as well as in compression
2. Transverse section of a beam remains plane before and after bending
3. The material of the beam is homogeneous and isotropic
4. All the above

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170. Pick up the correct statement from the following:

1. The point through which the resultant of the shear stresses passes is known as shear centre
2. In the standard rolled channels, the shear centre is on the horizontal line passing through and away from the C.G. beyond web
3. In equal angles, the shear centre is on the horizontal plane and away from the C.G., outside of the leg projection
4. All the above

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