Page 13 - Physics - XI

7. Repeat the observations for the diameter at least three times for three diff erent positions of the spherical
body or cylindrical body. Record the observations in the table.

8. To obtain the corrected diameter, subtract the zero error algebraically from the observed diameter.
(ii) Measurement of Internal Diameter of a Calorimeter

9. Insert the jaws C and D (Fig. 1.3) in the interior of a calorimeter and adjust the position of the movable
jaw so that C and D touches the walls of the calorimeter gently. Tighten the screw S.
A B

P Main Scale (M)
N
0 1 2 4 5 6 7 8 9 10
C D S

Calorimeter

Fig. 1.3: Measurement of internal diameter of a calorimeter

10. Note the position of the zero of the Vernier scale on the main C A
scale. This reading is called main scale reading (x). 0

11. Note the number of Vernier scale division (n) which is coinciding 1
with some division of the main scale. 2
12. Repeat the observations at least three times by changing the 3
position of the calorimeter. Record the observations in the D B

observation table.
13. Determine the corrected mean value of internal diameter by S 5 P
applying the zero error. 6
(iii) Measurement of Depth of a Calorimeter 7

14. For measuring the depth of the calorimeter, we use strip N of
the Vernier Calliper. 8 Main Scale (M)
15. Keep the edge of the main scale of Vernier Calliper on the upper 9
edge of the calorimeter so that strip N is able to go inside the 10

calorimeter along its length as shown in Fig. 1.4. M
16. Now, move the sliding jaw till the end of the strip N touches the N Calorimeter
bottom of the calorimeter.
17. To fi nd correct depth of the calorimeter, repeat the steps 14 to 16

at four diff erent positions along the circumference of the upper Fig. 1.4: Measurement of the
depth of a calorimeter.

edge of the calorimeter.

11