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Mechanical Engineering Objective Questions { Engineering Mechanics }



120. Which of the following is the unit of energy
A.Jouls
B.N-m
C.Electron-volt
D.All of the above

121. A 13 m ladder is placed against a smooth vertical wall with its lower end 5 m from the wall. What should be the coefficient of friction between ladder and floor so that it remains in equilibrium
A.0.1
B.0.15
C.0.2
D.0.21

122. The tension in the cable supporting a lift is more when the lift is
A.Moving downwards with uniform velocity
B.Moving upwards with uniform velocity
C.Stationary
D.Moving upwards with acceleration

123. A particle while sliding down a smooth plane of 19.86 ?2 m length acquires a velocity of 19.86 m/sec. The inclination of plane is
A.30
B.45
C.60
D.75

124. A man wishes to move a block of size 2 m x 2 m, weighing 100 kg. Coefficient of friction between block and floor is 0.3. How he can move it with least effort ?
A.Slide along ground by pushing
B.Tip it over
C.It is not possible to move it
D.Pull it

125. The product of mass and velocity is known as
A.Work
B.Moment
C.Impulse
D.Momentum

126. For a machine to be self-locking, its efficiency should be
A.100%
B.Less than 67%
C.Less than 50%
D.More than 50%

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