Thermodynamics Test

Result

Thermodynamics Test - 14

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Weekly Quiz Competition

Question 1
4 / -1

In the indicator diagram, Fig. net amount of work done will be

A
Positive

B
zero

C
infinity

D
negative
Question 2
4 / -1

In Fig. curves between volume V and temperature T are drawn at two different pressure P₁ and P₂. Which of the following statements is true?

A
P₁ = P₂

B
P₂ < P₁

C
P₂ > P₁

D
none of the above
Question 3
4 / -1

A Carnot engine works between 600 K and 300 K. In each cycle of operation, the engine draws 1000 J of heat energy from the source. The efficiency of the engine is

A
50%

B
70%

C
20%

D
80%

Solution
Question 4
4 / -1

A body cools from 50^oC to 49.9^oC in 5 sec. How long will it take to cool from 40^oC to 39.9^oC? Assume the temperature of surroundings to be 30^oC and Newton’s law of cooling to be valid.

A
2.5 s

B
10 s

C
20 s

D
5 s
Question 5
4 / -1

If l is length, A the area of cross section and K, thermal conductivity, then the thermal resistance of the block is given by

A
KlA

B
1/KlA

C
l + KA

D
l/KA

Solution
Question 6
4 / -1

The ideal black body is

A
lump of charcoal heated to a high temperature

B
metal coated with a black dye

C
glass surface coated with coal tar

D
hollow enclosure blackened inside and having a small hole.
Question 7
4 / -1

The phenomenon of black body radiation was explained statisfactorily by

A
Kinetic theory

B
Classical theory

C
Theory of relativity

D
Quantum theory
Question 8
4 / -1

A black body radiates at two temps T₁ and T₂, such that T₁ < T₂. The frequency corresponding to max. intensity is

A
less at T₁

B
more at T₁

C
equal in the two cases

D
cannot say

Solution
Question 9
4 / -1

Air in cylinder is suddenly compressed by a piston, which is then maintained at the same position. With the passage of time

A
the pressure increases

B
the pressure may increase or decrease

C
the pressure remains the same

D
the pressure decreases.
Question 10
4 / -1

A monoatomic gas is suddenly compressed to 1/8 adiabatically. The ratio of its final pressure to initial pressure is (γ = 5/3) th of its initial volume

A
32

B
40/3

C
24/5

D
8

Solution