Related Questions

Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity?
A CO2
B N2
C O2
D CO
For gases, the thermal conductivity increases with temperature rise. For liquids, with increase in concentration, its thermal conductivity generally
A Decreases
B Increases
C Remains unchanged
D Increases exponentially
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A $$\frac{1}{{\text{k}}}$$
B k
C k2
D $$\frac{1}{{{{\text{k}}^2}}}$$
Thermal conductivity of a conducting solid material depends upon its
A Temperature
B Porosity
C Both A & B
D Neither A nor B
A person needs 5 boards, each 3 feet 8 inches long but wood is not sold in fraction of a feet. What is the minimum length of wood, in feet, he must buy?
A 20
B 18
C 19
D 17
A carpenter needs 4 boards, each 2 feet 10 inches long,. If wood is sold only by the feet, what is the minimum length, in feet, of wood he must buy?
A 9
B 10
C 11
D 12
Wood charcoal is obtained by the destructive distillation of wood. It is used in the production of activated carbon, which is not used for the
A Decolourisation of sugar
B Solvent recovery from air and gases
C Absorption of gases and vapor
D Electrode manufacture
Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about
A Half
B One third
C One fifth
D One twelfth
Which of the metals has the maximum thermal conductivity?
A Iron
B Aluminium
C Silver
D Copper
Unit of thermal conductivity in S.I. units is
A J/m2 sec
B J/m °K sec
C W/m °K
D Option (B) and (C) above

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