75
Il be
e ratio of
c) Why are glass window possible to be cracked
14. a) Figure shows the
time of heating of certain
mass of substance versus
temperature.
i. Explain why there is no
rise in temperature of
substance in the region
AB and CD? [1]
ii. Why time of heating is
Temperature
1
Boiling
Point (0)
Melting
Point (m)
Solid
A
Solid+Liquid B
more in region CD than
the region AB? [1]
conductor.
C
> Liquid
O Vapour
Liquid Vapour D
Time of heating (in min.) →
E
b) Describe Searle's method to determination of thermal conductivity of a go
mperature gradient of an object.
[3]
[1]
theory of a
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