Strength of Materials

21. A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if

1. The floor is smooth, the wall is rough
2. The floor is rough, the wall is smooth
3. The floor and wall both are smooth surfaces
4. The floor and wall both are rough surfaces

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22. A heavy string attached at two ends at same horizontal level and when central dip is very small approaches the following curve

1. Catenary
2. Parabola
3. Hyperbola
4. Elliptical

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23. A joint of a frame is subjected to three tensile forces P, Q and R equally inclined to each other. If P is 10 tonnes, the other forces will be

1. Q = 10 tonnes and R = zero
2. R + 10 tonnes and Q = zero
3. Q + R = 10 tonnes
4. Q and R each is equal to 10 tonnes

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24. A long vertical member, subjected to an axial compressive load, is called

1. A column
2. A strut
3. A tie
4. A stanchion

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25. A member is balanced at its end by two inclined members carrying equal forces. For equilibrium the angle between the inclined bars must be

1. 3°
2. 45°
3. 90°
4. 120°

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26. A member which does not regain its original shape after removed of load producing deformation is said

1. Plastic
2. Elastic
3. Rigid
4. None of these

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27. A member which is subjected to reversible tensile or compressive stress may fail at a stress lower than the ultimate stress of the material. This property of metal, is called

1. Plasticity of the metal
2. Elasticity of the metal
3. Fatigue of the metal
4. Workability of the metal

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28. A number of forces acting at a point will be in equilibrium if

1. Their total sum is zero
2. Two resolved parts in two directions at right angles are equal
3. Sum of resolved parts in any two perpendicular directions are both zero
4. All of them are inclined equally

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29. A pair of smith's tongs is an example of the lever of

1. Zeroth order
2. First order
3. Second order
4. Third order

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30. A projectile is fired at an angle to the vertical. Its horizontal range will be maximum when is

1. 0°
2. 30°
3. 45°
4. 60°

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