Ordinary mercury in glass thermometer is used for measuring temperature upto 120°C. However, for measuring higher temperature upto __________ °C, thermometer is made by filling nitrogen under pressure above the mercury, which stops the evaporation of mercury and reduces the chance of broken thread of mercury?

Related Mcqs:

1. Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by__________________?

   A. Filling nitrogen under pressure in the stem
   B. Increasing the diameter of the tube
   C. Using steel tube in place of glass tube
   D. Accounting for the tube expansion

2. Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by__________________?

   A. Making the volume of thermometer bulb as large as conveniently possible
   B. Reducing the volume of the capillary to a minimum
   C. Reducing the volume of the receiving element to a minimum
   D. All A , B & C.

3. Working principle of mercury in glass thermometer is based on volumetric expansion of mercury with increase in temperature. Which of the following undergoes minimum volumetric expansion for a given temperature change ?

   A. Water
   B. Mercury
   C. Methyl alcohol
   D. Carbon-tetrachloride

4. Mercury thermometer can be used to measure the temperature upto ____________ °C?

   A. 100
   B. 250
   C. 350
   D. 750

5. Working principle of mercury in glass thermometer is based on the ______________ of mercury with increase in temperature?

   A. Increase of pressure
   B. Increase of thermal conductivity
   C. Volumetric expansion
   D. Differential linear expansion

6. A mercury thermometer cannot be used to measure the temperature below the freezing point of mercury, which is _____________ °C?

   A. -38.9
   B. -11.9
   C. -60.9
   D. -80.9

7. Mercury thermometer is commonly used for low temperature measurement. The freezing point and boiling point of mercury are respectively _____________ °C?

   A. – 39 and 350
   B. – 51 and 439
   C. – 79 and 395
   D. – 10 and 425

8. Nitrogen gas constant volume thermometer is suitable for measuring a temperature of _____________ °C?

   A. 0-100
   B. < 0
   C. > 100
   D. > 50

9. A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same_________________?

   A. Temperature measuring range (- 40°C to 450°C)
   B. Accuracy (± 1% of span)
   C. Speed of response
   D. All a, b & c

10. Platinum resistance thermometer can be used upto antimony point which is ____________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure?

    A. 961.93
    B. 630.74
    C. 1064.43
    D. 1261.93