Page 15 - Physics - XI

Table for calculation of depth (h) of a calorimeter

S. No. Main scale No. of Vernier Vernier scale Observed depth Corrected
reading division reading h = x + y depth
o
x coinciding y = n × (V.C.) (cm) h = h + (–e)
o
i
(cm) (n) (cm) (cm)
1.

2.

3.

4.

Calculations

1. Mean corrected diameter of given cylindrical/spherical body, D = D+ D+ D 3 = ______ cm
1
2
3
d + d + d + d
2. Mean corrected internal diameter of the given calorimeter, d = 1 2 3 4 = ______ cm
4
h + h + h + h
3. Mean corrected depth of the given calorimeter, h = 1 2 3 4 = ______ cm
4
d 2
Volume of the given calorimeter (V) = π h = ______ cm 3
4
Result
1. The diameter of the given spherical/cylindrical body is ___________ cm.

2. The internal diameter of the given calorimeter is ___________ cm.
3. The depth of the given calorimeter is ___________ cm.

4. The volume of the given calorimeter is ___________ cm .
3
Precautions
1. While measuring the depth of a beaker/calorimeter, the strip should be perpendicular to the bottom surface.

2. While measuring the depth of a beaker/calorimeter, the edge of the main scale should not get out of
contact from the edge of the circumference of the beaker/calorimeter when the end of strip N touches
the bottom.
3. The motion of Vernier scale on the main scale should be smooth. If not, it should be oiled.

4. The jaws of the Vernier Calliper should not be pressed hard.
5. The Vernier constant and zero error should be carefully calculated and recorded.

Sources of Error

1. Jaws of the Vernier Calliper may not be at right angle to the main scale.
2. Vernier scale may be loosely fi tted with the movable jaw.
3. The graduations on the scale may not be correct and clear.

4. Parallax may be there in taking observations.
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