Thermodynamics Test

Result

Thermodynamics Test - 59

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Weekly Quiz Competition

Question 1
4 / -1

The temperature of a hypothetical gas increases √2 to times when compressed adiabatically to half the volume. Its equation can be written as

A

B

C

D

Solution
Question 2
4 / -1

Two Carnot engines A and B are operated in succession. The first one, A receives heat from a source at T₁ = 800 K and rejects to sink at T₂K. The second engine B receives heat rejected by the first engine and rejects to another sink at T₃ = 300 K. If the work outputs of two engines are equal, then the value of T₂ is

A
100 K

B
300 K

C
550 K

D
700 K

Solution
Question 3
4 / -1

When an ideal monoatomic gas is heated at constant pressure, fraction of heat energy supplied which increases the internal energy of gas, is

A
2/5

B
3/5

C
3/7

D
3/4

Solution
Question 4
4 / -1

When an ideal gas (γ = 5/3) is heated under constant pressure, then what percentage of given heat energy will be utilised in doing external work

A
40%

B
30%

C
60%

D
20%

Solution
Question 5
4 / -1

Which one of the following gases possesses the largest internal energy?

A

B

C
8 grams of oxygen at 8 atm and 300 K

D

Solution
Question 6
4 / -1

Two samples A and B of a gas initially at the same pressure and temperature are compressed from volume V to V/2 (A isothermally and adiabatically). The final pressure of A is

A
Greater than the final pressure of B

B
Equal to the final pressure of B

C
Less than the final pressure of B

D
Twice the final pressure of B

Solution
Question 7
4 / -1

Initial pressure and volume of a gas are P and V respectively. First it is expanded isothermally to volume 4V and then compressed adiabatically to volume V. The final pressure of gas will be (given γ = 3/2)

A
1P

B
2P

C
4P

D
8P

Solution
Question 8
4 / -1

A thermally insulated rigid container contains an ideal gas heated by a filament of resistance 100 Ω through a current of 1 A for 5 mm, then change in internal energy is

A
0 kJ

B
10 kJ

C
20 kJ

D
30 kJ

Solution
Question 9
4 / -1

An engineer claims to have made an engine delivering 10 kW power with fuel consumption of 1 g/s. The calorific value of the fuel is 2 kcal/g. Is the claim of the engineer

A
Valid

B
Invalid

C
Depends on engine design

D
Depends on the load

Solution
Question 10
4 / -1

An ideal gas expands in such a manner that its pressure and volume can be related by equation PV² = Constant. During this process, the gas is

A
Heated

B
Cooled

C
Neither heated nor cooled

D
First heated and then cooled

Solution