When a balloon is inflated by blowing air into it, What happens to the balloon when it is inflated by blowing air into it?
What factors affect the boiling point ?
- 75 cm
- 92.5 cm
- 86.7 cm
- 150 cm
- 6.883 m
- 10.336 m
- 5.251 m
- 8.521 m
- 1.25 km
- 2.5 km
- 250 m
- 750 m
Two narrow bores of diameters 3.0 mm and 6.0 mm are joined together to form a U-tube open at both ends. If the U-tube contains water, what is the difference in its levels in the two limbs of the tube? Surface tension of water at the temperature of the experiment is 7.3×10–2Nm–1. Take the angle of contact to be zero and density of water to be 1.0×103kgm–3(g=9.8ms–2).
Does boiling point increase with the vapour pressure
- Mercury will come out from this hole after 10 sec
- Mercury will not come out from this hole
- First, mercury will come out and then stop after 10 sec
- Mercury will come out from this hole after 15 sec
- 760 m
- 76 m
- 10.5 m
- 105 m
The height of a mercury column in a barometer in a Calcutta library was recorded to be 75cm.Calculate this pressure in SI and CGS units using the following data : Specific gravity of mercury = 13.6, Density of water = 103 kg/m3, g = 9.8 m/s2 at Calcutta .Pressure = hpg in usual symbols.
- 142 cm
- 152 cm
- 132 cm
- 122 cm
A spherical ball contracts in volume by when subjected to normal uniform pressure . The Bulk modulus of its material is
- 100 kPa
- 50 kPa
- 200 kPa
- 0 kPa
Atmospheric pressure at sea level is 76 cm of mercury. Calculate the vertical height of the air column exerting the above pressure. Assume the density of air is 1.29 kg/m3 and that of mercury is 13600 kg/m3. Why the height calculated by you is far less than the actual height of the atmosphere?
(i) Barometer is used to measure atmospheric pressure
(ii) Manometer is used to measure gauge pressure of a fluid inside a container
- (i) Only
- (ii) Only
- Both (i) & (ii)
- None of these
(i) A simple U-tube manometer can measure negative gauge pressures.
(ii) Both ends of a U-tube manometer are exposed to the atmosphere. There exists a possibility that the height difference in the manometer is non-zero.
- Only (i) is correct
- Only (ii) is correct
- Both (i) and (ii) are correct
- None of these are correct
- 1 bar
- 1.6304 bar
- 0.3152 bar
- 1.3152 bar
A U-tube contains water and methylated spirit separated by mercury. The mercury columns in the two arms are in level with 10.0 cm of water in one arm and 12.5 cm of spirit in the other. What is the specific gravity of spirit?
- 76 cm
- <76 cm
- >76 cm
A faulty barometer contains certain amount of air and saturated water vapour. It reads 74.0 cm when the atmospheric pressure is 76.0 cm of mercury and reads 72.10 cm when the atmospheric pressure is 74.0 cm of mercury. Saturation vapour pressure at the air temperature = 1.0 cm of mercury. Find the length of the barometer tube above the mercury level in the reservoir.
Does high vapour pressure mean a high boiling point?
- None of the above
If the pressure exerted on gas is increased by 4 times and temperature is increased by 9 times, what will be the change in volume occupied by the gas?
An inverted tube barometer is kept in a lift moving vertical upward with an acceleration a. The density of mercury is ρ and acceleration due to gravity is g. If the atmospheric pressure be Po then