211. Profilometer is an instrument used to measure
A.Gear involute
B.Thread profile
C.Taper
D.Surface roughness
212. The value of a set of data at which the greatest number of cases is concentrated is called
A.Mean
B.Mode.
C.Range
D.Standard deviation
213. If the correctness of profile of a thread is to be checked, which instrument would you choose
A.Bench micrometer
B.Optical projector.
C.Sine bar
D.Telescopic gauge
214. The more sensitive instrument
A.First oscillates more
B.Oscillates more slowly
C.Has no oscillations
D.Is never stable
215. Frequency of oscillation of an instrument indicating device is a function of
A.Mass
B.Damping
C.Sensitivity
D.Both damping and sensitivity
216. The lost motion of the spindle in micrometer screw gauge when the rotation of the thimble is changed in direction is referred to as
A.Wear
B.Least count
C.Total error
D.Backlash
217. Stick micrometers are used for measuring
A.Depth of holes
B.Longer internal lengths
C.Longer external lengths
D.Height of parts
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