[3 Mark Question Answer]

Question 13 Marks

State the formulae for converting temperature in celsuis scale into (a) Kelvin scale (b) Fahrenheit scale.

Answer

Formula for conversion of Celsius scale into Kelvin scale:-
Temperature in kelvin scale = Temperature in Celsius scale + 273
$\Rightarrow$ Temperature in $K =$ Temperature in ${ }^{\circ} C +273$
Formula for conversion of Celsius scale into Fahrenheit scale:-
Temperature in Fahrenheit scale = 9C/5+32
Where C in the temperature in ${ }^{\circ} C$

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Question 23 Marks

Why is alcohol used as thermometric liquid in certain situations? Give two reasons.

Answer

Alcohol is used as a thermometric liquid in certain situations because of the following reasons:
1.The freezing point of alcohol is less than $-100^{\circ} C$, so we can measure very low temperature using an alcohol thermometer.
2.The expansion of alcohol is more than that of mercury for the same rise or fall of temperature, hence alcohol thermometer can measure temperature more accurately.
3.The bright color of alcohol makes it easy to see on the glass capillary tube.

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Question 33 Marks

Why is mercury used as thermometric liquid? Give three reasons.

Answer

Mercury is used as a thermometric liquid because of the following reasons:
1. The heat required for the expansion of mercury is very little, thus the temperature of a body can be easily recorded without changing its temperature.
2.Mercury is having a high boiling point of $357^{\circ} C$, so it can be used to record temperatures as high as $357^{\circ} C$.
3.The freezing point of mercury is $-39^{\circ} C$, so it can record temperatures as low as $-39^{\circ} C$.

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PHYSICS [3 Mark Question Answer]

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