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Strength of Materials - Civil Engineering - section-1
  1. Coefficient of friction is the

    2. A.

     angle between normal reaction and the resultant of normal reaction and the limiting friction
    B.

     ratio of limiting friction and normal reaction
    C.

     the friction force acting when the body is just about to move
    D.

     the friction force acting when the body is in motion

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  2. Pick up wrong statement about friction force for dry surfaces. Friction force is

    3. A.

     proportional to normal load between the surfaces
    B.

     dependent on the materials of contact surface
    C.

     proportional to velocity of sliding
    D.

     independent of the area of contact surfaces

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  3. Which of the following is not the unit of energy

    4. A.

     kg m
    B.

     kcal
    C.

     wattr
    D.

     watt hours

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  4. A body of weight W on inclined plane of a being pulled up by a horizontal force P will be on the point of motion up the plane when P is equal to

    5. A.

     W
    B.

     W sin (a + $)
    C.

     Wtan(a + <|))
    D.

     Wan(a-)

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  5. If a rigid body is in equilibrium under the action of three forces, then

    6. A.

     these forces are equal
    B.

     the lines of action of these forces meet in a point
    C.

     the lines of action of these forces are parallel
    D.

     (B) and (C) above

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  6. The coefficient of friction depends on

    7. A.

     area of contact
    B.

     shape of surfaces
    C.

     strength of surfaces
    D.

     nature of surface

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  7. A trolley wire weighs 1.2 kg per meter length. The ends of the wire are attached to two poles 20 meters apart. If the horizontal tension is 1500 kg find the dip in the middle of the span

    8. A.

     2.5 cm
    B.

     3.0 cm
    C.

     4.0 cm
    D.

     5.0 cm

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  8. In the lever of third order, load W, effort P and fulcrum F are oriented as follows

    9. A.

     W between P and F
    B.

     F between W and P
    C.

     P between W and F
    D.

     W, P and F all on one side

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

    10. A.

     Their total sum is zero
    B.

     Two resolved parts in two directions at right angles are equal
    C.

     Sum of resolved parts in any two perpendicular directions are both zero
    D.

     All of them are inclined equally

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  10. In ideal machines

    11. A.

     mechanical advantage is greater than velocity ratio
    B.

     mechanical advantage is equal to velocity ratio
    C.

     mechanical advantage is less than velocity ratio
    D.

     mechanical advantage is unity

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