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Standard XII

Chemistry

Introduction

An immersion ...

Question

An immersion heater is rated 418 W. It should heat a litre of water from 10 $^{o} C$ to 30 $^{o} C$ in nearly

40s

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21s

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24s

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16s

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Solution

The correct option is B 21s
The rate of heat produced by the heater is given by

$\frac{Q}{t} = m s Δ θ$

$t = \frac{Q}{m s Δ θ}$

$t = \frac{418}{(1) (1) (30 - 10)}$ ................(s = 1, for water)

$t = \frac{418}{20}$

$t = 20.9 \approx 21 s$

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An immersion heater is rated 418 W. It should heat a litre of water from 10oC to 30oC in nearly

The correct option is B 21sThe rate of heat produced by the heater is given byQt=msΔθt=QmsΔθt=418(1)(1)(30−10) ................(s = 1, for water)t=41820t=20.9≈21s

An immersion heater is rated 418 W. It should heat a litre of water from 10 $^{o} C$ to 30 $^{o} C$ in nearly

The correct option is B 21s
The rate of heat produced by the heater is given by

$\frac{Q}{t} = m s Δ θ$

$t = \frac{Q}{m s Δ θ}$

$t = \frac{418}{(1) (1) (30 - 10)}$ ................(s = 1, for water)

$t = \frac{418}{20}$

$t = 20.9 \approx 21 s$