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10-1.Thermometry, Thermal Expansion and Calorimetry
easy
Fire is extinguished more effectively by
A
Hot water
B
Cold water
C
Equally by both
D
Ice
Solution
(a) Fire is extinguished by the vaporisation do water which lowers the temperature of the burning body. Further, the water vapour envelops the body, keeping oxygen away. Hot water evaporates more than cold water as
Standard 11
Physics
Similar Questions
Values for latent heat in Column$-\,I$ and its values are given in Column$-\,II$. Match the followings :
| Column $-\,I$ | Column $-\,II$ |
| $(a)$ Latent heat of vaporization $L_V$ | $(i)$ $22.6\, \times \,{10^5}\,J\,/kg$ |
| $(b)$ Latent heat of fusion $L_f$ | $(ii)$ $33.3\, \times \,{10^5}\,J\,/kg$ |
| $(iii)$ $3.33\, \times \,{10^5}\,J\,/kg$ |
easy
