Liquid diffusivity is of the order of __________ cm2 /second.

Question: Overheating of satellites during re-entry to earth is controlled by
[A].

thick insulation.

[B].

ceramic lining.

[C].

cooling by flow of air over the surface.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalant bonds resulting in __________ electrons.
[A].

lack of free

[B].

excess of

[C].

decrease in

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.