71. Which of the following forces can act as a centripetal force?
a) Tension
b) Friction
c) Gravitational force
d) All of these
72. Conventionally anticlockwise torque is taken as:
a) Negative
b) Positive
c) Parallel
d) Zero
73. A door requires a minimum torque of 80 N in order to open it. What is the minimum distance of the handle from the hinges, If the door is to be pulled with a force at the handle not greater than 100N?
a) 0.6m
b) 1m
c) 0.4m
d) 0.8m
74. Two children are balanced on opposite sides of the seesaw. If one child leans inward toward the pivot point, his side will:
a) rise
b) fall
c) insufficient
d) neither rise nor fall
75. A body in equilibrium must not be:
a) At rest
b) moving
c) rotating
d) accelerating
76. The torque in a uniform rotating fan having a blade of length 0.5 m is:
a) 0.5 Nm
b) 2 Nm
c) -0.5 Nm
d) 0 Nm
77. A force of 100 N is applied perpendicularly at 0.5m, to turn a nut of a wheel of a bus. The torque acting on the nut is:
a) 500 Nm
b) 50 Nm
c) 5 Nm
d) 0.005 Nm
78. Which of the following is called a Strategic metal?
A. Silicon
B. Titanium
C. Uranium
D. Germanium
79. The operation of threading a drilled hole is called:
A. Tapping
B. Broaching
C. Lapping
D. Reaming
80. The first symbol in a grinding wheel code is the:
A. Bond Type
B. Grain size
C. Structure
D. Abrasive Type
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