31. A body at a given temperature will emit radiation of a whole range of wavelengths and not a single wavelength. The statement is related to:

(a) Wavelength and Frequency

(b) The Origins of Radiant Energy

(c) The Distribution of Radiant Energy

(d) The Emissive Power

(b) The Origins of Radiant Energy

(c) The Distribution of Radiant Energy

(d) The Emissive Power

**Answer: (c)**

32. Which of the following laws are the laws of black-body radiation?

(a) Planck’s law, Wien’s law and Fourier’s law

(b) Planck’s law, Fourier’s law and Stefan-Boltzmann law

(c) Planck’s law, Wien’s law and Stefan-Boltzmann law

(d) Fourier’s law, Wien’s law and Stefan-Boltzmann law

(a) Planck’s law, Wien’s law and Fourier’s law

(b) Planck’s law, Fourier’s law and Stefan-Boltzmann law

(c) Planck’s law, Wien’s law and Stefan-Boltzmann law

(d) Fourier’s law, Wien’s law and Stefan-Boltzmann law

**Answer: (c)**

33. In diffusion, when vapour pressure of water in air equals that of the liquid, the air is saturated and vaporization:

(a) Persists

(b) Initiates

(c) Ceases

(d) Preserves

(a) Persists

(b) Initiates

(c) Ceases

(d) Preserves

**Answer: (c)**

34. A Newtonian fluid which is in fully developed flow has the actual velocity distribution at the entrance to the heated section and the theoretical distribution throughout the tube. They both are:

(a) Parabolic

(b) Circular

(c) Linear

(d) Elliptic

(a) Parabolic

(b) Circular

(c) Linear

(d) Elliptic

**Answer: (a)**

35. If the liquid wets the surface, the condensate flows on the surface in the form of a film, and the process is called:

(a) Drop condensation

(b) Film condensation

(c) Film flow condensation

(d) Laminar film condensation

(a) Drop condensation

(b) Film condensation

(c) Film flow condensation

(d) Laminar film condensation

**Answer: (b)**

36. During the re-entry of a space vehicle into the earth’s atmosphere a large quantity of heat is generated at the surface due to air friction, which is very rapidly removed by a process called:

(a) Ablation

(b) Abolition

(c) Abrasion

(d) Aeration

(a) Ablation

(b) Abolition

(c) Abrasion

(d) Aeration

**Answer: (a)**

37. The transport of one constituent from a region of higher concentration to that of a lower concentration is known as:

(a) Mass Diffusion

(b) Mass Transition

(c) Mass Transfer

(d) Heat Transfer

(a) Mass Diffusion

(b) Mass Transition

(c) Mass Transfer

(d) Heat Transfer

**Answer: (c)**

38. The polluted water requires Chlorine of 8 kg/day to treat 20,000 cubic metre per day. The residual after 10 minutes contact is 0.20 mg/𝑙 . The dosage will be:

(a) 0.8 mg/𝑙

(b) 0.6 mg/𝑙

(c) 0.4 mg/𝑙

(d) 0.2 mg/𝑙

(a) 0.8 mg/𝑙

(b) 0.6 mg/𝑙

(c) 0.4 mg/𝑙

(d) 0.2 mg/𝑙

**Answer: (c)**

39.

(a) 1.26 ℎ

(b) 1.52 ℎ

(c) 2.52 ℎ

(d) 3.26 ℎ

(b) 1.52 ℎ

(c) 2.52 ℎ

(d) 3.26 ℎ

**Answer: (b)**

40. The total hemispherical emissive power will be denoted by the symbol:

**Answer: (c)**

## 0 comments:

## Post a Comment