The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas).

The density of a gas 'X' is twice that of another gas 'Y'. If the molecular weight of gas 'Y' is 'M'; then the molecular weight of the gas 'X' will be

A

2M

B

$$\frac{{\text{M}}}{2}$$

C

M

D

$$\frac{{\text{M}}}{4}$$

For a perfect gas, according to Boyle’s law (where p = Absolute pressure, v = Volume and T = Absolute temperature)

A

$$\frac{{\text{v}}}{{\text{T}}}$$ = constant, if p is kept constant

B

pv = constant, if T is kept constant

C

$$\frac{{\text{T}}}{{\text{p}}}$$ = constant, if v is kept constant

D

$$\frac{{\text{p}}}{{\text{T}}}$$ = constant, if v is kept constant

If V, U and Vr represent the absolute velocity of fluid, velocity of blade, and relative velocity of fluid, and suffix ‘I’ and ‘o’ stand for entry and exit conditions, then in a rotary machine whose degree of reaction is unity

A

Vi = Vo

B

Vt > Vo

C

U

D

V = Uo

In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where, T = absolute temperature )

A

$$\frac{1}{{\sqrt {\text{T}} }}$$

B

$$\frac{1}{{\text{T}}}$$

C

$$\sqrt {\text{T}} $$

D

T

In case of isentropic flow, the speed of sound in an ideal gas is proportional to (where M = molecular weight of the gas)

A

$$\frac{1}{{\sqrt {\text{M}} }}$$

B

$$\sqrt {\text{M}} $$

C

$$\frac{1}{{\text{M}}}$$

D

M

The absolute entropy for all crystalline substances at absolute zero temperature is

A

Zero

B

Negative

C

More than zero

D

Indeterminate

Wien’s law states that the wave length corresponding to ________ is proportional to the absolute temperature.

A

Minimum energy

B

Maximum energy

C

Both (A) and (B)

D

None of these

Kinetic energy of the molecules in terms of absolute temperature (T) is proportional to

A

T

B

J

C

J²

D

Vr

Wavelength corresponding to the maximum energy is inversely proportional to the absolute temperature. This is __________ law.

A

Stefan's

B

Dalton's

C

Wien's

D

Kirchoffs

The Kundsen diffusivity is proportional to (where, T = absolute temperature)

A

$$\sqrt {\text{T}} $$

B

T²

C

T

D

T⁴

The molecular velocity of a real gas is proportional to (where, T = absolute temperature of the gas).

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