Practice Test: Question Set - 01
1. A body of mass ‘m’ moving with a constant velocity ‘v’ strikes another body of same mass moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is
- (A) v
- (B) 2v
- (C) 4v
- (D) 8v
2. The bellow figure shows the three coplanar forces P, Q and R acting at a point O. If these forces are in equilibrium, then
- (A) P/sin β =
Q/sin α = R/sin ɣ
- (B) P/sin α =
Q/sin β = R/sin ɣ
- (C) P/sin ɣ =
Q/sin α = R/sin β
- (D) P/sin α =
Q/sin ɣ = R/sin β
3. The centre of percussion of the homogeneous rod of length ‘L’ suspended at the top will be
- (A) L/2
- (B) L/3
- (C) 3L/4
- (D) 2L/3
4. The angle of inclination of the plane at which the body begins to move down the plane, is called
- (A) Angle
of friction
- (B) Angle
of repose
- (C) Angle
of projection
- (D) None
of these
5. Pick up wrong statement about friction force for dry surfaces. Friction force is
- (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
6. The term 'Centroid' is
- (A) The
same as centre of gravity
- (B) The
point of suspension
- (C) The
point of application of the resultant of all the forces tending to cause a body
to rotate about a certain axis
- (D) None
of the above
7. The C.G. of a plane lamina will not be at its geometrical centre in the case of a
- (A) Right angled triangle
- (B) Equilateral triangle
- (C) Square
- (D) Circle
8. 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
- (D) None
of these
9. The moment of inertia of a thin rod of mass 'm' and length 'l', about an axis through its centre of gravity and perpendicular to its length is
- (A) ml2/4
- (B) ml2/
6
- (C) ml2/8
- (D) ml2/12
10. Forces are called coplanar when all of them acting on body lie in
- (A) One point
- (B) One plane
- (C) Different planes
- (D) Perpendicular planes
11. A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of
- (A) 1 m
- (B) 2 m
- (C) 3 m
- (D) 4 m
12. A weight of 1000 N can be lifted by an effort of 80 N. If the velocity ratio is 20, the machine is
- (A) Reversible
- (B) Non-reversible
- (C) Ideal
- (D) None of
these
13. Centre of gravity of a solid cone lies on the axis at the height
- (A) One fourth of the
total height above base
- (B) One third of the
total height above base
- (C) One-half of the total height above base
- (D) Three eighth of the
total height above the base
14. The periodic time (T) is given by (where, ω = Angular velocity of particle in rad/s.)
- (A) ω/2π
- (B) 2π/ω
- (C) 2Ï€ ×
ω
- (D) π/ω
15. 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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