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NEET 2008

Exam: NEET
Year: 2008
Subject: Physics
Chapter: Thermal Properties of Matter

NEET 2008 · Physics · Thermal Properties of Matter

An electric kettle takes 4 ~A current at 220 ~V . How much time...

An electric kettle takes

4 \mathrm{~A}

current at

220 \mathrm{~V}

. How much time will it take to boil

1 \mathrm{~kg}

of water from temperature

20^{\circ} \mathrm{C}

? The temperature of boiling water is

100^{\circ} \mathrm{C}

.

Options

A $4.2 \mathrm{~min}$
B $6.3 \mathrm{~min}$
C $8.4 \mathrm{~min}$
D $12.6 \mathrm{~min}$

Correct answer

B. $6.3 \mathrm{~min}$

Step-by-step solution

\begin{aligned}& \text{ Vit }=m c \Delta \theta\\ & t=\frac{1 \times 4200 \times 80}{220 \times 4}=381.8 \mathrm{~s}=6.36 \mathrm{~min} \end{aligned}

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