If two capillary tubes of radii r1 and r2 in the ratio 1 : 2 are dipped vertically in water, then the ratio of capillary rises in the respective tubes is
1 : 4
4 : 1
1 : 2
2 : 1
If the excess pressure inside a soap bubble of radius r1 in air is equal to the excess pressure inside air bubble of radius r2 inside the soap solution, then r1 : r2 is
2 : 1
1 : 2
1 : 4
The pressure at depth h below the surface of a liquid of density ρ open to the atmosphere is
greater than the atmospheric pressure by ρgh
less than the atmospheric pressure by ρgh
equal to the atmospheric pressure
decreases exponentially with depth
A.
greater than the atmospheric pressure by ρgh
Pressure at depth h to the open surface
p = p0 + hρg
i.e., the pressure at depth h below the surface of a liquid of density ρ open to the atmosphere is greater than the atmosphere pressure by ρgh.
1 cc of water becomes 1681 cc of steam when boiled at a pressure of105 Nm-2. The increasing internal energy of the system is (Latent heat of steam is 540 cal g-1 , 1 cal = 4.2 J)
300 cal
500 cal
225 cal
600 cal
A partition wall has two layers of different
materials A and B in contact with each other.
They have the same thickness but the thermal conductivity of layer A is twice that of layer B. At steady state if the temperature difference across the layer B is 50 K, then the corresponding difference across the layer A is
50 K
12.5 K
16.6 K
60 K
Identify the wrong statement
For isothermal process, ΔT = 0
For isochoric process, ΔV = 0
For cyclic process, ΔW = 0
For adiabatic process, ΔQ = 0
If the pressure and the volume of certain quantity of ideal gas are halved, then its temperature
is doubled
becomes one-fourth
remains constant
is halved
Two pendulums of lengths 1.44 m and 1 m start to swing together. The number of vibrations after which they will again start swinging together is
4
3
5
2
The average total energy in one time period of a particle of mass m executing SHM of amplitude a and angular velocity ω is
0
mω2a2
Which one of the following is simple harmonic ?
Rotation of earth around the sun
Rotation of earth about its own axis
Motion of oscillating liquid column in U-tube
Motion of a steel ball in a viscous medium