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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 6
46.
Which of the following is used in temperature alarm circuits?
Thermistor
Photoconductor
Transistor
Varistor
Answer: Option
Explanation:
No answer description is available. Let's discuss.
47.
A metal has a large number of free electrons. If e is electronic charge and m is mass of electron and an electric field E is applied along (say) x direction, the electrons acquire a velocity having a component vx is x direction. Then
Answer: Option
Explanation:
No answer description is available. Let's discuss.
48.
n type semiconductors
are negatively charged
are produced when indium as impurity is added to germanium
are produced phosphorus as impurity is added to silicon
none of the above
Answer: Option
Explanation:

n type semiconductors are produced by adding pentavalent material like phosphorus to silicon.

49.
The most important primary force of attraction in the formation of solids is
electromagnetic
electrostatic
quantum-electrostatic
quantum electromagnetic
Answer: Option
Explanation:
No answer description is available. Let's discuss.
50.
When two conductors carry currents in the same direction the force is repulsive.
True
False
Answer: Option
Explanation:

The force is attractive.

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