set 9 MCQ Questions & Answers Detailed Explanation

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The following question based on electric current and magnetism topic of general science mcq

Questions : Fluorescent tubes are fitted with a choke. The choke coil :

(a) reduces current in the circuit

(b) steps up the line voltage

(c) steps-down the line voltage

(d) chokes low frequency current

The correct answers to the above question in:

Answer: (a)

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Question : 1

In semiconductors, at room temperature

a) the valence band is partially empty and the conduction band is partially filled

b) the valence band is completely filled and the conduction band is partially filled

c) the conduction band is completely empty

d) the valence band is completely filled

Answer: (b)

In semiconductros, the conduction is empty and the valence band is completely filled at 0 K. No electron from valence band can cross over to conduction band at 0K.

But at room temperature some electrons in the valence band jump over to the conduction band due to the small forbidden gap.

i.e. 1 eV.

Question : 2

Nickel-Cadmium (Ni-Cd) battery is used in

a) Transistors

b) Calculator

c) Cordless electronic appliances

d) All of the above

Answer: (d)

Question : 3

Zener breakdown takes place if

a) doped impurity is high

b) less impurity in n-part

c) doped impurity is low

d) less impurity in p-part

Answer: (a)

Zener breakdown can occur in heavily doped diodes. In lightly doped diodes the necessary voltage is higher, and avalanche multiplication is then the chief process involved.

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