Thermodynamics Test

Result

Thermodynamics Test - 78

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Weekly Quiz Competition

Question 1
4 / -1

The P-V diagram of 2 g of helium gas for a certain process A → B is shown in the figure. What is the heat given to the gas during the process A → B ?

A
4 P₀V₀

B
6P₀V₀

C
4.5 P₀V₀

D
2P₀V₀

Solution
Question 2
4 / -1

A certain mass of gas at 273 K is expanded to 81 times its volume under adiabatic condition. If γ = 1.25 for the gas, then its final temperature is

A
–235° C

B
–182° C

C
–90° C

D
0°C

Solution
Question 3
4 / -1

In an adiabatic process 90 J of work is done on the gas. The change in internal energy of the gas is

A
– 90 J

B
+ 90 J

C
0 J

D
Depends of initial temperature

Solution
Question 4
4 / -1

If a Carnot\'s engine functions at source temperature 127°C and at sink temperature 87°C, what is its efficiency

A
10%

B
25%

C
40%

D
50%

Solution
Question 5
4 / -1

In a thermodynamic process pressure of fixed mass of a gas is changed in such a manner that the gas releases 30 joules of heat and 10 joules of work was done on the gas. If the initial internal energy of the gas was 30 joules, then the final internal energy will be

A
2 J

B
18 J

C
10 J

D
58 J

Solution
Question 6
4 / -1

The internal energy of an idea gas increase during an isothermal process when the gas is

A
Expanded by adding more molecules to it

B
Expanded by adding more heat to it

C
Expanded against zero pressure

D
Compressed by doing work on it A gas is compressed adiabatically till its temperature is doubled.

Solution
Question 7
4 / -1

A cylinder of mass 1 kg is given heat of 20000 J at atmospheric pressure. If initially temperature of cylinder is 20°C, then work done by the cylinder will be (Given that Specific heat of cylinder = 400 J kg^–1, Coefficient of volume expansion = 9 × 10^–5 ° C^–1, Atmospheric pressure =10⁵ N/m² and density of cylinder 9000 kg/ m³)

A
0.02 J

B
0.05 J

C
0.08 J

D
0.1 J

Solution
Question 8
4 / -1

A
1.30

B
1.50

C
1.67

D
2.00

Solution
Question 9
4 / -1

In an adiabatic change, the pressure P and temperature T of a monoatomic gas are related by the relation P ∝ T^C , where c equals

A
5/3

B
2/5

C
3/5

D
5/2

Solution
Question 10
4 / -1

An ideal gas heat engine operates in a Carnot cycle between 227°C and 127°C. It absorbs 6 kcal at the higher temperature. The amount of heat (in k-cal) converted into work is equal to

A
3.5

B
1.6

C
1.2

D
4.8

Solution