A body absorbs 1000 calories of heat when it is heated from $20^{0} C$ to $70^{0} C$ . The water equivalent of the body is

10 g

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15 g

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20 g

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25 g

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Solution

The correct option is C 20 g
Heat capacity of the body $= \frac{1000}{70 - 20} = 20 c a l / K$
Water equivalent is calculated as:
$m c_{w} =$ heat capacity of the body
$m c_{w} = 20$
$m \times 1 = 20$ [ $c_{w} = 1 c a l / g m - K$ ]
$m = 20 g m$

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