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11. A smooth cylinder lying on its convex surface remains in __________ equilibrium.

A. stable
B. unstable
C. neutral

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12. The coefficient of friction is the ratio of the limiting friction to the normal reaction between the two bodies.

A. Yes
B. No

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13. Moment of inertia of a circular section about an axis perpendicular to the section is

A. πd³/16
B. πd³/32
C. πd⁴/32
D. πd⁴/64

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14. The time of flight (t) of a projectile on an upward inclined plane is(where u = Velocity of projection, α = Angle of projection, and β = Inclination of the plane with the horizontal.)

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15. The unit of angular acceleration is

A. N-m
B. m/s
C. m/s²
D. rad/s²

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16. Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its C.G. and parallel to the base, is

A. bh³/4
B. bh³/8
C. bh³/12
D. bh³/36

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17. If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be

A. same
B. half
C. double

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18. Which of the following is an equation of linear motion? (where, u and v = Initial and final velocity of the body, a = Acceleration of the body, and s = Displacement of the body in time t seconds.)

A. v = u + a.t
B. s = u.t + 1/2 a.t²
C. v² = u²+2a.s
D. all of these

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19. If a number of forces are acting at a point, their resultant will be inclined at an angle θ with the horizontal, such that

A. tan θ = ∑H/∑V
B. tan θ = ∑V/∑H
C. tan θ = ∑Vx∑H
D. 

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20.

The above figure shows the two equal forces at right angles acting at a point. The value of force R acting along their bisector and in opposite direction is

A. P/2
B. 2P
C. 
D. 

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