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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 3
1.
At a very low temperature, a semiconductor
becomes a conductor
becomes an insulator
may become a conductor or an insulator
will remain a semiconductor becomes a conductor or an insulator
Answer: Option
Explanation:

Semi conductor becomes insulator at very low temperature.

2.
The colour code on a carbon resistor is red-red-black-silver. The value of resistor is
22000 Ω
2200 Ω
22 ± 5% Ω
22 ± 10% Ω
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
Some typical examples of macroscopic quantities are
conductivity
µr
dielectric constant
all of the above
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
The temperature coefficient of a thermistor
is positive
is negative
zero
may be positive or negative depending on its composition
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.

Assertion (A): Helium, Argon and Neon are gaseous at room temperature.

Reason (R): The atoms in Helium, Argon and Neon are chemically extremely inactive.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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