Questions and answers for exam Preparation

MCQs

Laws Of Thermodynamics

Total Questions : 1462 | Page 4 of 147 pages

Question 31. The value of 1 mm of Hg is equal to

1.333 N/m²
13.33 N/m²
133.3 N/m²
1333 N/m²

Discuss Question

Answer: Option C. -> 133.3 N/m²
Answer: (c).133.3 N/m²

Question 32. The sum of internal energy (U) and the product of pressure and volume (p.v) is known as

workdone
entropy
enthalpy
none of these

Discuss Question

Answer: Option C. -> enthalpy
Answer: (c).enthalpy

Question 33. The universal gas constant of a gas is the product of molecular mass of the gas and the gas constant.

Correct
Incorrect
Can't say
None of these

Discuss Question

Answer: Option A. -> Correct
Answer: (a).Correct

Question 34. Which of the following is correct?

Absolute pressure = Gauge pressure + Atmospheric pressure
Gauge pressure = Absolute pressure + Atmospheric pressure
Atmospheric pressure = Absolute pressure + Gauge pressure
Absolute pressure = Gauge pressure - Atmospheric pressure

Discuss Question

Answer: Option A. -> Absolute pressure = Gauge pressure + Atmospheric pressure
Answer: (a).Absolute pressure = Gauge pressure + Atmospheric pressure

Question 35. The distillation carried out in such a way that the liquid with the lowest boiling point is first evaporated and recondensed, then the liquid with the next higher boiling point is then evaporated and recondensed, and so on until all the available liquid fuels are separately recovered in the sequence of their boiling points. Such a process is called

cracking
carbonisation
fractional distillation
full distillation

Discuss Question

Answer: Option C. -> fractional distillation
Answer: (c).fractional distillation

Question 36. Which of the following statement is incorrect?

The liquid fuels consist of hydrocarbons.
The liquid fuels have higher calorific value than solid fuels.
The solid fuels have higher calorific value than liquid fuels.
A good fuel should have low ignition point.

Discuss Question

Answer: Option C. -> The solid fuels have higher calorific value than liquid fuels.
Answer: (c).The solid fuels have higher calorific value than liquid fuels.

Question 37. Which is the incorrect statement about Carnot cycle?

It is used as the alternate standard of comparison of all heat engines.
All the heat engines are based on Carnot cycle.
It provides concept of maximising work output between the two temperature limits.
all of the above

Discuss Question

Answer: Option B. -> All the heat engines are based on Carnot cycle.
Answer: (b).All the heat engines are based on Carnot cycle.

Question 38. When two bodies are in thermal equilibrium with a third body, they are also in thermal equilibrium with each other. This statement is called

Zeroth law of thermodynamics
First law of thermodynamics
Second law of thermodynamics
Kelvin Planck's law

Discuss Question

Answer: Option A. -> Zeroth law of thermodynamics
Answer: (a).Zeroth law of thermodynamics

Question 39. The expansion ratio (r) is the ratio of (where v1 = Volume at the beginning of expansion, and v2 = Volume at the end of expansion)

v1/v2
v2/v1
(v1 + v2)/v1
(v1 + v2)/v2

Discuss Question

Answer: Option B. -> v2/v1
Answer: (b).v2/v1

Question 40. The thermodynamic property of a system is said to be an intensive property whose value for the entire system __________ the sum of their value for the individual parts of the system.