Materials and Components - ECE Questions and Answers

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL

If the operating temperature increases by 10°C, the rate of deterioration of solid dielectric becomes

double

one and a half time

3 times

4 times

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL

In which of the following semiconductor are holes minority carriers

extrinsic

p type

n type

intrinsic

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL

At 0 K, silicon and germanium behave like monoatomic crystals.

True

False

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL

Assertion (A): Acceptor extrinsic semiconductor has higher conductivity than intrinsic semiconductor.

Reason (R): Addition of p-type impurity produces an allowable discrete energy level just above valence band.

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

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL

Soft iron is suitable for making temporary magnets.

True

False

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL

Antiferromagnetic materials do not have permanent dipoles.

True

False

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL

The Ohm's law for conduction in metals is

J = σE

J =

J ∝ σE

J ∝

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL

The measurement of Hall coefficient of a semiconductor with one type of charge carriers gives the information about

sign of charge carrier

density of charge carrier

both sign and density of charge carrier

none of the above

Whatsapp
Facebook
Copy
Copy Text
Copy
Copy URL

∈₀ has no other physical meaning than that of a fundamental conversion factor.

True

False