Class 11 Physics · Chapter 6 · Test 4
Adiabatic Processes and Numericals
25 MCQs This test covers the adiabatic equation PV^γ = constant, γ = Cp/Cv, adiabat versus isotherm, examples of adiabatic change, and PV = Nk_BT with its numericals. It also covers the first law in the human body, petrol and diesel engine efficiency, and mixed first-law, gas-law and entropy numericals.
25 questions · 20 min · 25 marks
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Sample questions
The first 5 of 25. Try each one, then tap to see the answer.
Question 1
The equation describing an adiabatic process of an ideal gas is:
- APV = constant
- BPV^γ = constant
- CP/V^γ = constant
- DP^γ V = constant
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Answer: B
For an adiabatic process of an ideal gas PV^γ = constant.
Question 2
In the adiabatic equation γ is the ratio:
- ACv/Cp
- BCp x Cv
- CCp/Cv
- DCp - Cv
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Answer: C
γ is the ratio of the specific heat at constant pressure to that at constant volume.
Question 3
The value of γ for a gas is always:
- AEqual to 1
- BLess than 1
- CZero
- DGreater than 1
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Answer: D
Cp is greater than Cv so γ = Cp/Cv is greater than 1.
Question 4
On a P-V diagram an adiabat is steeper than an isotherm because:
- AIn an adiabatic change the temperature also changes so pressure changes more for the same volume change
- BIn an isothermal change no work is done
- CAn adiabat has constant pressure
- DAn isotherm involves no gas
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Answer: A
During adiabatic expansion the gas cools (and during compression it heats) so pressure changes more than at constant temperature.
Question 5
At the same point on a P-V diagram the magnitude of the slope of the adiabat compared with the isotherm is:
- AEqual
- Bγ times larger
- Cγ times smaller
- DZero
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Answer: B
The isotherm slope is -P/V and the adiabat slope is -γP/V.
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