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Standard XII

Physics

Pascal's Law

A 2100 W co...

Question

A $2100 W$ continuous flow geyser (instant geyser) has water inlet temperature $= 10^{o} C$ while the water flows out at the rate of $20 g / s e c$ . The outlet temperature of water must be about

20^{o} C

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30^{o} C

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35^{o} C

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40^{o} C

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Solution

The correct option is B $35^{o} C$
$P = m c Δ T$ , where m=is flow rate , P=Q/t J/sec or watt
so, $2100 = 20 \times 10^{- 3} \times 4200 (T - 10)$
$T = 35^{o} C$

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Similar questions

Q. A

2100 W

continuous flow geyser (instant geyser) has water inlet temperature

= 10^{\circ} C

while the water flows out at the rate of

20 g/sec

. The outlet temperature of water must be about
(Assume that time lag between inlet and outlet flow is

1 s

)

A continuous flow water heater (geyser) has an electrical power rating $= 2 k W$ and efficiency of conversion of electrical power into heat $= 80 %$ . If water is flowing through the device at the rate of $100 c c / s e c$ , and the inlet temperature is $10^{\circ} C$ , the outlet temperature will be :

Q. A continuous flow water heater (geyser) has an electrical power rating

= 2 kW

and efficiency of conversion of electrical power into heat

= 80 %

. If water is flowing through the device at the rate of

100 cc/sec

, and the inlet temperature is

10^{\circ} C

, the outlet temperature will be

Q. The resistance of an electric geyser is

14

ohm. Current flowing is

4 A .

How much water can it heat to raise its temperature by

10^{o} C

10

min?

Use specific heat capacity of water

= 4.186 \times 10^{3} J k g^{- 1} C^{o - 1}

What would be the final temperature of a mixture of $50 g$ of water at $20^{o} C$ temperature and $50 g$ of water at $40^{o} C$ temperature?

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

The correct option is B 35oCP=mcΔT , where m=is flow rate , P=Q/t J/sec or wattso, 2100=20×10−3×4200(T−10)T=35oC

A $2100 W$ continuous flow geyser (instant geyser) has water inlet temperature $= 10^{o} C$ while the water flows out at the rate of $20 g / s e c$ . The outlet temperature of water must be about

The correct option is B $35^{o} C$
$P = m c Δ T$ , where m=is flow rate , P=Q/t J/sec or watt
so, $2100 = 20 \times 10^{- 3} \times 4200 (T - 10)$
$T = 35^{o} C$