# Electronics and Communication Engineering - Exam Questions Papers

26.

A silicon wafer has 100 nm of oxide it and is inserted in a furnace at a temperature above 1000°C for further oxidation in dry oxygen. The oxidation rate

 A. is independent of current oxide thickness and temperature B. is independent of current oxide thickness but depends on temperature C. slows down as the oxide grows D. is zero as the existing oxide prevents further oxidation

Explanation:

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27.

When a vector has positive divergence, it indicates that the vector quantity has at that point and if the divergence is negative, it indicates __________ .

 A. source, sink B. sink, source C. positive value, negative value D. negative value, positive value

Explanation:

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28.

A function of one of more variables which conveys information on the nature of physical phenomenon is called

 A. Noise B. Interference C. System D. Signal

Explanation:

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29.

A current source with three basic transistors is shown. All transistors are similar. All are having finite current gain β

Then I0 is

 A. B. C. D.

Explanation:

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30.

Which of the following represent a wave equation for a tightly stretched elastic string of length l and 'm', mass per unit?

 A. B. C. D.