Electronics and Communication Engineering - Materials and Components

1. 

At a very low temperature, a semiconductor

A. becomes a conductor
B. becomes an insulator
C. may become a conductor or an insulator
D. will remain a semiconductor becomes a conductor or an insulator

Answer: Option B

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

A. 22000 Ω
B. 2200 Ω
C. 22 ± 5% Ω
D. 22 ± 10% Ω

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

3. 

Some typical examples of macroscopic quantities are

A. conductivity
B. µr
C. dielectric constant
D. all of the above

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

4. 

The temperature coefficient of a thermistor

A. is positive
B. is negative
C. zero
D. may be positive or negative depending on its composition

Answer: Option B

Explanation:

No answer description available for this question. Let us 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.

A. Both A and R are true and R is correct explanation of A
B. Both A and R are true but R is not correct explanation of A
C. A is true but R is false
D. A is false but R is true

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

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