APSWREI SOCIETY
LESSON PLAN 5
Class:
Subject:
Lesson:
IX
Physical Science
Measurement
Date &Time:
Period
:
Medium
:
Topic:
Vernier Calipers 2
Sub-topic: Measurement of length of a cylinder
Announcement of the Topic : Today let us learn Measurement of length of a cylinder by using Vernier Calipers
Content
Analysis/Concepts/Subconcepts
Motivation (or) Testing
of Previous knowledge
Activities indicating behavioral/Learning outcomes
By Teacher
We learnt the principle
of vernier and its
description in the last
class.
What is the principle of
vernier?
By pupils
N V.S.D = (N – 1) M.S.D
What is the formula for
the least count of vernier
calipers ?
L.C. = S/N
What is its value for our
instrument ?
0.1 mm
Can you express it in
cms?
0.1 mm/10
= 0.01cm
Aids/Experiments to
be
done/demonstration
etc
Method
Evaluation
Content
Analysis/Concepts/Subconcepts
Measurement of Length
of a Cylinder :
 The least count of the
instrument is to be
determined before
taking the readings.
 Close the two jaws of
the calipers and
ensure that the two
zeroes coincide. If the
zero of the main scale
and vernier scale do
not coincide, note
down the zero error
and its correction.
 Now, keep the given
cylinder firmly
between the two
jaws J1 and J2.
 Note the main scale
reading (M.S.R)
preceding the vernier
zero.
 Note the Vernier
Coincidence division
(V.C.D)
 Substitute the values
in the formula:
Actual length of the
cylinder = M.S.R +
(V.C.D x L.C)
Activities indicating behavioral/Learning outcomes
By Teacher
By pupils
Aids/Experiments to
be
done/demonstration
etc
Method
Evaluation
Lecture
What principle is used
in the construction of
a vernier scale of
desired least count?
Teacher gives cylinders
to the student groups.
Where should we place
the object?
between the two external
What is the main scale
division preceding the
vernier zero called ?
Main scale reading (M.S.R)
What is the main scale
reading in your
instrument ?
Zero of the vernier is
between 2.5 cm and 2.6
cm.
Then M.S.R =?
2.5 cm
What is the vernier scale
division coinciding with
any one of the main
scale division called ?
Vernier coincidence
division (V.C.D)
What is the V.C.D in your
instrument ?
4
What is the unit of
Vernier coincidence
division ?
It has no units as it is a
What is the value of least
count of your vernier
0.1 mm
jaws.
Vernier calipers,
cylinder, chalk piece
and black board
cum
demons
tration
method
number
How do you
determine main scale
reading?
Content
Analysis/Concepts/Subconcepts
Zero Error of the
Vernier:
If the zero of the main
scale does not coincide
with the zero of the
vernier scale, then the
vernier is said to have
zero error.
Positive zero error: If
the zeroth division of
the vernier scale is on
the right of the zeroth
division of the main
scale ,the error is said to
be positive and the
correction is negative.
Negative zero error: If
the zeroth division of
the vernier scale is on
the left of the zeroth
division of the main
scale ,the error is said to
be negative and the
correction is positive.
Activities indicating behavioral/Learning outcomes
By Teacher
By pupils
calipers?
Express the value in centi
meters .
0.01 cm
What is the formula to
determine the actual
length of the object by
using vernier calipers?
Actual length of the
cylinder = M.S.R + (V.C.D x
L.C)
Now, what is length of
the given cylinder?
Length of the cylinder =
M.S.R + (V.C.D x L.C)
= 2.5 cm +( 4 x 0.01 cm)
= 2.5 cm + 0.04 cm
= 2.54 cm.
How will you decide that When the two jaws J1 and
a vernier calipers has no J2 are in contact with each
zero error?
other, if the zeroth
divisions of main scale and
vernier scale are coinciding
with each other, vernier
calipers is said to have no
zero error.
If the zeroth division of + 3 x 0 .01 cm = + 0.03 cm
the vernier scale is on
the right of the zeroth
division of the main scale
by 3 divisions, what is
error in the instrument?
Aids/Experiments to
be
done/demonstration
etc
Method
Evaluation
How do you
determine Vernier
coincidence division ?
What is the formula to
determine the actual
length of the object by
using vernier calipers?
Content
Analysis/Concepts/Subconcepts
Activities indicating behavioral/Learning outcomes
By Teacher
By pupils
Aids/Experiments to
be
done/demonstration
etc
What is the correction ?
- 0.03 cm
If the zeroth division of -2 x 0.01 cm = -0.02 cm
the vernier scale is on
the left of the zeroth
division of the main scale
by 2 divisions, what is
error in the instrument?
What is the correction?
+0.02 cm
Method
Evaluation
What is positive zero
error and how is it
determined?
What is negative zero
error and how is it
determined?
Behavioral changes expected and achieved :
Assignment/ Home work given
Knowledge
:
Students can acquire a good knowledge on the working of vernier calipes.
Understanding
:
Students can understand the experimental determination of the accurate length of an object
by using vernier calipers.
Application
:
Students can apply the knowledge of experimental determination of accurate length of an
object by using vernier calipers while doing experiments with other instruments.
Skill
:
Student can develop skill in doing practicals .
:
Draw the neat diagrams showing the zero errors of a vernier calipers.
Signature of the teacher
Signature of the Principal