84. A thermally thin body is the one for which
A. Biot number is less than 0.1
B. Gallileo number is less than 0.1
C. Fourier number is less than 0.1
D. Fourier number is greater than 0.1
✅ The correct answer is option A.
86. An ideal material for making cooking vessels should have
A. High heat capacity
B. Low heat capacity
C. High thermal conductivity
D. Both B and C
✅ The correct answer is option D.
88. On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium⁻²35.
A. 1
B. 2.5
C. 3.5
D. 5
✅ The correct answer is option B.
90. Fluorine is not a constituent of
A. Freon
B. Chloroform
C. Teflon
D. Fluorocarbons
✅ The correct answer is option B.
93. One ton of refrigeration is not equivalent to the heat removal rate of
A. 200 BTU/minute
B. 50 kcal/minute
C. 50 kJ/sec
D. 3.5 KW
✅ The correct answer is option C.
96. Consumable electrodes are used in the __________ welding.
A. Gas
B. Arc
C. Thermit
D. Resistance
✅ The correct answer is option B.
99. If a solid is compressed adiabatically in its elastic range, its __________ remains constat
A. Internal energy
B. Enthalpy
C. Entropy
D. Temperature
✅ The correct answer is option C.
102. ‘Sterilised zone’ around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction.
A. 0.5
B. 5
C. 25
D. 50
✅ The correct answer is option B.
105. Silicon percentage in the silicon steel used for electrical appliances/equipments is
A. 0.3-0.4
B. 12-14
C. 3-4
D. 20-25
✅ The correct answer is option C.
108. Joule-Thomson co-efficient is the ratio of
A. Pressure change to temperature change occuring during adiabatic compression of a gas
B. Pressure change to temperature change occuring during adiabatic throttling of a gas
C. Temperature change to pressure change occuring during adiabatic compression of a gas
D. Temperature change to pressure change occuring during adiabatic throttling of a gas
✅ The correct answer is option D.