Ram saw the nurse jerk the clinical thermometer before measuring his body temperature. Why did she do that?

To release air bubbles stuck in the tube.

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To increase the temperature of the tube.

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To bring the mercury level from the capillary tube to the bulb.

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To increase the mercury level from kink to room temperature.

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Solution

The correct option is C To bring the mercury level from the capillary tube to the bulb.
A clinical thermometer has a kink to retain mercury level after expansion which helps the observer to read the value before the mercury contracts back. The nurse jerks the thermometer to bring back any residual mercury still stuck in the capillary tube, so that the value of the temperature can be measured accurately.

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In a constant volume gas thermometer, the pressure of the working gas is measured by the difference in the levels of mercury in the two arms of a U-tube connected to the gas at one end. When the bulb is placed at the room temperature 27.0℃, the mercury column in the arm open to atmosphere stands 5.00 cms above the level of mercury in the other arm. When the bulb is placed in a hot liquid, the difference of mercury levels becomes 45.0 cms. Calculate the temperature of the liquid. (Atmospheric pressure = 75.0 cm of mercury.)

Q. With increase in temperature, the fluid level in capillary tube will

Q. In a constant volume gas thermometer the pressure of the working gas is measured by the difference in the level of mercury in the two arms of a U-tube connect to the gas at one end. When the bulb is placed at the room temperature

{27.0}^{\circ}

, the mercury column in the arm open to atmosphere stands 5.00 cm above the level of mercury in the other arm. When the bulb is placed in a hot liquid, the difference of mercury levels becomes 45.0 cm. Calculate the temperature(x+170)(

^{o} C

) of the liquid. Mark the value of x.(Atmospheric pressure = 75.0 cm of mercury.)

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