KVPY SA Exam 2018 Question Paper

Vaporization rate of water = 20 g/h
Water vaporized in 2 hour = 20 × 2 gm
dm=

40

1000

kg

Latent‌heat‌of‌vaparisation

specific‌heat‌of‌water

=540=

L

C

heat contain in vaporised vapor = (dm).L = (dm).L
Heat lost by water in earthen pitcher = mc. dT
m = 4 Kg
heat loss by water in earthen pitcher = heat contain in vaporised water
dm. L = m.C. dT

40

1000

(

L

C

)=4.dt
dT=

1

100

×540=5.4°C
dT=5.4°C