Engineering Mechanics practice test online - Set 12 - ObjectiveBooks

Practice Test: Question Set - 12

1. Which one of the following statements is not correct?
(A) The tangent of the angle of friction is equal to coefficient of friction
(B) The angle of repose is equal to angle of friction
(C) The tangent of the angle of repose is equal to coefficient of friction
(D) The sine of the angle of repose is equal to coefficient to friction

2. Coplanar concurrent forces are those forces which
(A) Meet at one point, but their lines of action do not lie on the same plane
(B) Do not meet at one point and their lines of action do not lie on the same plane
(C) Meet at one point and their lines of action also lie on the same plane
(D) Do not meet at one point, but their lines of action lie on the same plane

3. If ‘P’ is the force acting on the body, ‘m’ is the mass of the body and ‘a’ is the acceleration of the body, then according to Newton's second law of motion,
(A) P + m.a = 0
(B) P - m.a = 0
(C) P × m.a = 0
(D) P/m.a = 0

4. If three forces acting in different planes can be represented by a triangle, these will be in
(A) Non-equilibrium
(B) Partial equilibrium
(C) Full equilibrium
(D) Unpredictable

5. The horizontal range of a projectile (R) is given by
(A) R = u² cos2α/g
(B) R = u² sin2α/g
(C) R = u² cosα/g
(D) R = u² sinα/g

6. A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will ___________ with the increase in coefficient of friction.

(A) Increase
(B) Decrease
(C) Not be effected
(D) None of these

7. Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.
(A) Meet
(B) Do not meet
(C) Either ‘A’ or ‘B’
(D) None of these

8. Which of the following do not have identical dimensions?
(A) Momentum and impulse
(B) Torque and energy
(C) Torque and work
(D) Moment of a force and angular momentum

9. In order to determine the effects of a force, acting on a body, we must know
(A) Magnitude of the force
(B) Line of action of the force
(C) Nature of the force i.e. whether the force is push or pull
(D) All of the above

10. A framed structure is perfect, if the number of members are __________ (2j - 3), where j is the number of joints.
(A) Equal to
(B) Less than
(C) Greater than
(D) None of these

11. The ratio of limiting friction and normal reaction is known as
(A) Coefficient of friction
(B) Angle of friction
(C) Angle of repose
(D) Sliding friction

12. The bodies which rebound after impact are called
(A) Inelastic bodies
(B) Elastic bodies
(C) Neither elastic nor inelastic bodies
(D) None of these

13. The velocity of a particle (v) moving with simple harmonic motion, at any instant is given by (where, r = Amplitude of motion, and y = Displacement of the particle from mean position.)
(A) ω.√(y² - r²)
(B) ω.√(r² - y²)
(C) ω².√(y² - r²)
(D) ω².√(r² - y²)

14. If n = number of members and y = number of joints, then for a perfect frame, n = ?
(A) 1/2
(B) 2/3
(C) 3/2
(D) 2/4

15. A framed structure is imperfect, if the numbers of members are __________ (2j - 3).
(A) Equal to
(B) Less than
(C) Greater than
(D) Either (B) or (C)

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