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1. Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to

A. area of the triangle
B. twice the area of the triangle
C. half the area of the triangle
D. none of these

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2. If the tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is

A. g/2
B. g/3
C. g/4
D. none of these

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3. The efficiency of a screw jack is given by(where α = Helix angle, and φ = Angle of friction.)

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4. When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.

A. Yes
B. No

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5. The frequency of vibrations means the number of cycles per second.

A. Yes
B. No

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6. The time of flight (t) of a projectile on a horizontal plane is given by

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7. The velocity ratio for the third system of pulleys is

A. n
B. n²
C. 2ⁿ
D. 2ⁿ – 1

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8. If the gravitational acceleration at any place is doubled, then the weight of a body will be

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9. The moment of inertia of a thin spherical shell of mass m and radius r, about its diameter, is

A. mr²/3
B. 2mr²/3
C. 2mr²/5
D. 3mr²/5

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10. The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by

A. P + Q
B. P – Q
C. P / Q
D. Q / P

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