Thermodynamics Test

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Thermodynamics Test - 22

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Weekly Quiz Competition

Question 1
4 / -1

An ideal gas heat engine operates in Carnot cycle between 227^oC and 127^oC. It absorbs 6 × 10⁴ cals of heat at higher temperature. Amount of heat converted to work is:

A
4.8 × 10⁴ cals

B
2.4 × 10⁴ cals

C
1.2 × 10⁴ cals

D
6 × 10⁴ cals.

Solution
Question 2
4 / -1

Which of the following circular rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature difference will conduct most heat?

A
r = 2r_o ; l = 2l_o

B
r = 2r_o ; l = l_o

C
r = r_o ; l = 2l_o

D
r = r_o ; l = l_o

Solution
Question 3
4 / -1

A system goes from A to B via two processes I and II as shown in Fig. If ∆U₁ and ∆U₂ are the changes in internal energies in the processes I and II respectively, then

A
∆U₂ < ∆U₁

B
∆U₂ > ∆U₁

C
relation between ∆U₁ and ∆U₂ can not be determined

D
∆U₁ = ∆U₂
Question 4
4 / -1

Water of volume 2 litre in a container is heated with a coil of 1 kW at 27^oC. The lid of the container is open and energy dissipates at the rate of 160 J/s. In how much time, temperature will rise from 27^oC to 77^oC? [Given specific heat of water is 4.2 kJ/kg]

A
8 min 20 s

B
6 min 2 s

C
7 min

D
14 min
Question 5
4 / -1

Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1^oC and it is defined under which of the following conditions?

A
From 14.5^oC to 15.5^oC at 760 mm of Hg

B
From 98.5^oC to 99.5^oC at 760 mm of Hg

C
From 13.5^oC to 14.5^oC at 76 mm of Hg

D
From 3.5^oC to 4.5^oC at 760 mm of Hg.
Question 6
4 / -1

A rigid container with thermally insulated walls contains a coil of resistance 100Ω, carrying current 1 A. Change in internal energy after 5 minute will be

A
0 kJ

B
10 kJ

C
20 kJ

D
30 kJ
Question 7
4 / -1

A difference of temperature of 25^o C is equivalent to a difference of

A
72^o F

B
45^o F

C
32^o F

D
25^o F

Solution
Question 8
4 / -1

What is the value of absolute temperature on the Celsius Scale ?

A
‒273.15^oC

B
100^oC

C
‒32^oC

D
0^oC

Solution
Question 9
4 / -1

At Which temperature the density of water is maximum ?

A
4^o F

B
42^o F

C
32^o F

D
39.2^o F

Solution
Question 10
4 / -1

The temperature of a body on Kelvin Scale is found to be x.K.when it is measured by Fahrenhit thesmometes. it is found to be x^oF, then the value of x is .

A
313

B
301.24

C
574.25

D
40

Solution

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Thermodynamics Test - 22

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Thermodynamics Test - 22

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Question 1

4.8 × 104 cals

2.4 × 104 cals

1.2 × 104 cals

6 × 104 cals.

Solution

Question 2

r = 2ro ; l = 2lo

r = 2ro ; l = lo

r = ro ; l = 2lo

r = ro ; l = lo

Solution

Question 3

∆U2 < ∆U1

∆U2 > ∆U1

relation between ∆U1 and ∆U2 can not be determined

∆U1 = ∆U2

Question 4

8 min 20 s

6 min 2 s

7 min

14 min

Question 5

From 14.5oC to 15.5oC at 760 mm of Hg

From 98.5oC to 99.5oC at 760 mm of Hg

From 13.5oC to 14.5oC at 76 mm of Hg

From 3.5oC to 4.5oC at 760 mm of Hg.

Question 6

0 kJ

10 kJ

20 kJ

30 kJ

Question 7

72o F

45o F

32o F

25o F

Solution

Question 8

‒273.15oC

100oC

‒32oC

0oC

Solution

Question 9

4o F

42o F

32o F

39.2o F

Solution

Question 10

313

301.24

574.25

40

Solution

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4.8 × 10⁴ cals

2.4 × 10⁴ cals

1.2 × 10⁴ cals

6 × 10⁴ cals.

r = 2r_o ; l = 2l_o

r = 2r_o ; l = l_o

r = r_o ; l = 2l_o

r = r_o ; l = l_o

∆U₂ < ∆U₁

∆U₂ > ∆U₁

relation between ∆U₁ and ∆U₂ can not be determined

∆U₁ = ∆U₂

From 14.5^oC to 15.5^oC at 760 mm of Hg

From 98.5^oC to 99.5^oC at 760 mm of Hg

From 13.5^oC to 14.5^oC at 76 mm of Hg

From 3.5^oC to 4.5^oC at 760 mm of Hg.

72^o F

45^o F

32^o F

25^o F

‒273.15^oC

100^oC

‒32^oC

0^oC

4^o F

42^o F

32^o F

39.2^o F