Page 10 - 9-phy-1 Measurements

2. Some modern screw gauges are digital, as shown in Fig 1.3.4.
(i) Suggest one advantage of a digital screw gauge.
(ii) Suggest one disadvantage of a digital screw gauge.

35
30
25
0 20
15

Fig. 1.3.4

3. The approximate diameter of a flexible thin wire can be determined by
the apparatus shown in Fig. 1.3.5. Describe how would you use this
apparatus to obtain a reasonably accurate value for average diameter
(d) of the flexible wire.

Reel with wire

Plasticine metre rule graduated in millimetres

Fig. 1.3.5

4. Can you use a screw gauge to measure the exact thickness of a 10 rupee
note?

5. (a) Place ten similar coins one above the other and find their total height
by using a ruler.

(b) Determine average thickness of a coin.
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