1
###
A diatomic ideal gas is used in a Carnot engine as the working substance

A diatomic ideal gas is used in a Carnot engine as the working substance. If during the adiabatic expansion part of the cycle the volume of the gas increases from V to 32 V, the efficiency of the engine is

- .99
- .75
- .50
- .25

2
###
One kg of a diatomic gas is at a pressure

One kg of a diatomic gas is at a pressure of 8 × 10^{4} N/m^{2}. The density of the gas is 4 kg/m^{3}. What is the energy of the gas due to its thermal motion?

- 3 × 10
^{4}J - 5 × 10
^{4}J - 6 × 10
^{4}J - 7 × 10
^{4}J

3
###
1 mole of a gas with γ = 7/5 is mixed with 1 mole of a gas with γ = 5/3

1 mole of a gas with γ = 7/5 is mixed with 1 mole of a gas with γ = 5/3, then the value of γ for the resulting mixture is

- 2/5
- 24/16
- 12/7
- 7/5

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