Related Questions

Capillary rise of mercury in a small diameter tube is proportional of (where, d = mercury of the rube, σ = surface tension of mercury)
A d
B 1/d
C σ
D 1/σ
A barometer measures the __________ pressure.
A Absolute
B Gauge
C Absolute as well as gauge
D Dynamic
An aneroid barometer measures the __________ pressure.
A Atmospheric
B Absolute
C Vacuum
D Gage
Pressure difference between two points in vessels, pipelines or in two different pipelines can be measured by a differential manometer. The pressure difference measured as the mm of water coloumn in case of mercury-water, differential manometer is equal to (where, H = difference in height of mercury column in mm).
A H
B 12.6 H
C 13.6 H
D 14.6 H
Mercury is often used in barometer because
A it is the best liquid
B the height of barometer will be less
C its vapour pressure is so low that it may be neglected
D both (B) and (C)
Why does the mercury column in the barometer fall rapidly before a severe storm? It is due to
A Increase in the humidity of air
B Fall in the atmospheric pressure
C Severe heat energy from the sun
D Rise in the atmospheric pressure
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
A mercury thermometer can not 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
Mercury thermometer is commonly used for low temperature measruement. 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
Capillary rise of mercury in a small diameter tube is proportional to (where, d = diameter of the tube, σ = surface tension of mercury)
A d
B $$\frac{1}{{\text{d}}}$$
C $$\sigma $$
D $$\frac{l}{\sigma }$$

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