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JEE Main 20203 SeptemberEvening Shift

Exam: JEE Main
Year: 2020
Date: 3 September
Shift: Evening Shift
Subject: Physics
Chapter: Thermal Properties of Matter

JEE Main 2020 · 3 September · Evening Shift · Physics · Thermal Properties of Matter

A calorimeter of water equivalent 20g contains 180g of water at 25...

A calorimeter of water equivalent

20g

contains

180g

of water at

25 ° C

.

m ' '

' grams of steam at

100 ° C

is mixed in it till the temperature of the mixture is

31 ° C

. The value of

m ' '

is close to (Latent heat of water

= 540cal{g}^{- 1}

, specific heat of water

= 1cal{g}^{- 1 °}{C}^{- 1}

)

Options

A $2$
B $4$
C $3 . 2$
D $2 . 6$

Correct answer

A. $2$

Step-by-step solution

\left(200\right) $\left(31 - 25\right)$ = m \times 540 + m \left(1\right)\left(69\right)

$1200 = m \left(609\right)$

$m \approx 2$

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