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Q.

A 2100 W continuous flow geyser (instant geyser) has water inlet temperature = 10° C  while the water flows out at the rate of 20 g/sec. The outlet temperature of water must be about 

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a

20° C 

b

30° C 

c

35° C 

d

40° C 

answer is C.

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Detailed Solution

i.e.dQdt=dmdt=dmdtsΔT

On putting the values, we get
2100=0.02×4200ΔT

Or  ΔT=21000.02×4200=25

As ΔT=Tf−Ti

Hence Tf−10=25
 Or Tf=350

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