VERNIER CALIPER
Q.1: What is vernier
calipers?
Ans. It is simple
instrument by which length of an object can be measured accurately up to
one-tenth of a millimeter or one-hundredth of a centimeter.
Q.2: What is the use of
Vernier Scale?
Ans. To increase the
accuracy of the main scale.
Q.3: What is least count
(L.C.)?
Ans. The minimum
measurement that can be taken by an instrument.
Q.4: What is the least
count of?
meter scale (b) Stop
Watch (c) Vernier Calliper
Ans. The least count of:
meter scale = 0.1 cm or 1
mm.
stop watch = 0.01 sec or
1/100 sec. or according to stop watch.
vernier scale = 0.002 mm
or 0.01 mm according to Vernier calliper
Q.5: What are units of
vernier scale?
Ans. Vernier has not
units of its own.
Q.6: What is the
difference in the measurement of one smaller division on the main scale (M.S.)
and that of vernier scale (V.S.)
Ans. (1 smallest Div. on
M.S.) – (1 smallest Div. on V.S) = 0.1 – 0.09 = 0.01 cm = Least count.
Q.7: How the L.C. of a
vernier is determined?
Ans. By using the
relation:
L.C. = (Smallest division
on Main Scale ) / (Total number of divisions on Vernier Scale)
Q.8: Will the accuracy of
a vernier will increase or decrease if 20 divisions are made in the same
length?
Ans. The accuracy will
increase since the L.C. will decrease i.e. Accuracy α = 1 / Least count
Q.9: Which one is smaller
M.S. div. or V.S. div.?
Ans. V.S. division.
Q.10: What are the
functions of (a) Sliding strip (b) Upper jaws
Ans. (a) For measuring
depth. (b) For measuring the inner diameter.
Q.11: What is meant by
zero error (Z.E.)?
Ans. The error which
arises when zeros of M.S. and V.S. do not coincide upon joining the two jaws.
Q.12: When Z.E. is
positive?
Ans. The Z.E. is positive
when the zero of V.S. is to the right of the zero of M.S.
Q.13: How we find the
corrected reading?
Ans. Corrected reading =
Meaning reading – ( + Z.E.)
Q.14: Do you know any use
of vernier scale?
Ans. It is used in
spectrometer, barometer, traveling microscope, etc.
Q.15: What are
significant figures?
Ans. Numbers 0, 1, 2, 3,
……. are called significant figures when they occur. The zero is not a
significant figure if it is at the extreme left or extreme right of a number,
e.g. 1.02 has three significant figures, but 1.20 has two significant figures.
Q.16: What is meant by
degree of accuracy?
Ans. It is the
measurement estimated by the number of significant figures in the result.
Q.17: Why is the vernier
calipers so called?
Ans. A French
mathematician named Pierre Vernier invented it and it is named after him.
Q.18: How does
temperature affect the length of a cylinder?
Ans. The length of a
cylinder increases with the increase of temperature and decreases with the
decrease of temperature.
Q.19: What is the unit of
volume?
Ans. In MKS system, the
unit of volume is m3. In CGS system, the unit of volume is cm3. In FPS
system, the unit of
volume is ft3.
S
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