Class XI Physics Thermodynamics 3

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Question 1

A quasi-static process has main characteristics as it is

• Aa reversible process
• Ba non-changing process
• Can infinitely slow process
• Da spontaneous process

Question 2

One mole of an ideal mono atomic gas is mixed with two moles of an ideal diatomic gas. The ratio of specific heats of the mixture is

• A1.5
• B1.4
• C10/6
• D19/13

Question 3

In a refrigerator the engine absorbs energy from a cold reservoir and expels energy to a hot reservoir. It states that

• Aenergy does not flow spontaneously from a cold object to a hot object
• Binput of energy by work is require in this process
• Csecond law of thermodynamics appear, at first sight, to be unrelated
• Dnone of these

Question 4

An ideal heat engine takes 5x10⁶ joule of heat from the source it operates between 177 ^oC and 27 ^oC the work done by this engine is

• A1.67x10⁶ joules
• B2.67x10⁶ joules
• C3.67x10⁶ joules
• D4.67x10⁶ joules

Question 5

Rank in order, from largest to smallest, the work W out performed by these four heat engines.

• AW_b > W_a > W_c > W_d
• BW_d > W_a = W_b > W_c
• CW_b > W_a > W_b = W_c
• DW_d > W_a > W_b > W_c

Question 6

Isentropic flow is

• Airreversible adiabatic flow
• Bideal fluid flow
• Cfrictionless reversible flow
• Dreversible adiabatic flow

Question 7

An ideal reversible Carnot cycle is represented by T-S diagram below. The efficiency of the cycle is represented by which of the following area of areas?

• A1-2-3-6/1-2-4-5
• B1-2-4-5/1-2-3-6
• C3-4-5-6/1-2-4-5
• D1-2-4-5/3-4-5-6

Question 8

According to the first law of thermodynamics ΔQ = dU + ΔW, in an isochoric process –

• AΔQ = dU
• BΔQ = ΔW
• CΔW = –dU
• DΔW = ΔU

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