Sail E0 Webinar

MCQs

Heat Radiation, Thermal Properties Of Matter, Dual Nature Of Matter

Total Questions : 247 | Page 8 of 25 pages
Question 71. A radiation shield should
  1.    Have high transmissivity
  2.    Absorb all the radiations
  3.    Have high reflexive power
  4.    Partly absorb and partly transmit the incident radiation
 Discuss Question
Answer: Option C. -> Have high reflexive power
Answer: (c).Have high reflexive power
Question 72. Which one of the following is true for opaque non-black surface?
  1.    J = E +2 p G
  2.    J = E + p G
  3.    J = 2 E + p G
  4.    J = ½ E + p G
 Discuss Question
Answer: Option B. -> J = E + p G
Answer: (b).J = E + p G
Question 73. Which of the following can be used as a radiating shield?
  1.    Carbon
  2.    Thin sheets of aluminum
  3.    Iron
  4.    Gold
 Discuss Question
Answer: Option B. -> Thin sheets of aluminum
Answer: (b).Thin sheets of aluminum
Question 74. Radiation shield are used between the emitting surfaces such that
  1.    To reduce overall heat transfer
  2.    To increase overall heat transfer
  3.    To increase density
  4.    To reduce density
 Discuss Question
Answer: Option A. -> To reduce overall heat transfer
Answer: (a).To reduce overall heat transfer
Question 75. Determine the net radiant heat exchange per m 2 area for two infinite parallel plates held at temperature of 800 K and 500 K. Take emissivity as 0.6 for the hot plate and 0.4 for the cold plate
  1.    6200 W/m²
  2.    7200 W/m²
  3.    8200 W/m²
  4.    9200 W/m²
 Discuss Question
Answer: Option A. -> 6200 W/m²
Answer: (a).6200 W/m²
Question 76. Which layers participated in the process of thermal radiation through solids and liquids?
  1.    1 micron to 1 mm thick
  2.    2 micron to 2 mm thick
  3.    1 micron to 0.5 mm thick
  4.    2 micron to 4.57 mm thick
 Discuss Question
Answer: Option A. -> 1 micron to 1 mm thick
Answer: (a).1 micron to 1 mm thick
Question 77. The monochromatic absorption coefficient depends upon
(i) Temperature
(ii) Time
(iii) Pressure
(iv) Wavelength
Identify the correct option
  1.    1, 2 and 4
  2.    2, 3 and 4
  3.    1 and 2
  4.    1, 3 and 4
 Discuss Question
Answer: Option D. -> 1, 3 and 4
Answer: (d).1, 3 and 4
Question 78. Some of the gases have low emissive power and absorptivity. They are considered practically diathermanous. Which of the following option is true?
  1.    Ammonia
  2.    Helium
  3.    Carbon-dioxide
  4.    Methane
 Discuss Question
Answer: Option B. -> Helium
Answer: (b).Helium
Question 79. When a gas or vapor is in the process of oxidation and combustion, it is called as
  1.    Oxidation
  2.    Flame
  3.    Reduction
  4.    Combustion
 Discuss Question
Answer: Option B. -> Flame
Answer: (b).Flame
Question 80. Consider a beam of monochromatic radiation at wavelength λ that enters a layer of absorbing gas. As the beam passes through the gas layer, its intensity
  1.    Decreases
  2.    Increases
  3.    Become twice
  4.    Remains same
 Discuss Question
Answer: Option A. -> Decreases
Answer: (a).Decreases

Latest Videos
Chapter 1 - GLOBAL STEEL SCENARIO & INDIAN STEEL INDUSTRY Part 1 : (13-04-2024) INDUSTRY AND COMPANY AWARENESS (ICA)
Direction Sense Test Part 1 Reasoning (Hindi)
Chapter 1 - RMHP / OHP / OB & BP Part 1 : (14-02-2024) GPOE
Cube & Cuboid Part 1 Reasoning (Hindi)
Data Interpretation (DI) Basic Concept Reasoning (Hindi)
Counting Figures Part 1 Counting Of Straight Lines Reasoning (Hindi)
Sail E0 free webinar Webinars
Real Numbers Part 7 Class 10 Maths
Real Numbers Part 1 Class 10 Maths
Polynomials Part 1 Class 10 Maths

Latest Test Papers

Pie Chart - Test Paper 1 Data Interpretation Reasoning & DI
Tabulation - Test Paper 2 Data Interpretation Reasoning & DI
Test Paper 1 Direction Sense Test Reasoning & DI
ICA , RDIC,GFM Free Modal Test Paper - Non - Technical Branch Old Syllabus 2022 - SAIL Junior Officer E0
GFM Combined 1 Free Revision Test SAIL JO E-0