Materials and Components – Section 3

Materials and Components – Section 3

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

3. Some typical examples of macroscopic quantities are
A.conductivity
B.µr
C.dielectric constant
D.all of the above

Answer: Option D

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

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

6. Resistivity of rubber is about
A.102 Ω-m
B.10-2 Ω-m
C.5 x 108 Ω m
D.5 x 1012 Ω-m

Answer: Option D

7. An iron specimen has µr = 1000 when B = 0.3 T. If B = 0.35 T, µr
A.will be 1000
B.will be less than 1000
C.will be more than 1000
D.may be more or less than 1000

Answer: Option D

 

8. Which solid dielectric has highest temperature limit?
A.E
B.H
C.C
D.F

Answer: Option C

9. Permeability is analogous to
A.resistivity
B.retentivity
C.conductivity
D.coercivity

Answer: Option C

10. The colour code on a carbon resistor is green-blue-yellow. The tolerance is
A.± 5%
B.± 10%
C.± 20%
D.± 30%

Answer: Option C

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