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For a constant volume gas thermometer select the correct statement.

(a) It doesn’t use mercury for pressure measurement

(b) We actually measure the pressure at constant volume and the scale is calibrated to give the temperature reading

(c) Any high density gas can be used

(d) Pressure ∝ Temp^2

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Correct option is (b) We actually measure the pressure at constant volume and the scale is calibrated to give the temperature reading

Easy explanation: A constant volume gas thermometer has a mercury manometer connected to a gas bulb. With increase in temperature of the bulb, its volume is kept constant by external methods and the pressure of gas increases.                                                                                                                                                   The temperature scale is defined as a function of this pressure.                                                                                       (T = kP, where k is a constant).

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Correct option is (b) It shows linear variation in volume with temperature

Explanation: For measuring temperature in a thermometer we need a substance whose physical properties change with temperature and can be easily related with temperature. Mercury’s volume increases linearly with increase in temperature and hence we can create a scale on the thermometer accordingly.

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