Electronics Gk - Study Mode

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[#26] Consider the following statements. 1. A p - n junction diode is a basic semiconductor device. 2. A p - n junction diode can work as excellent rectifier. 3. The p - n junction diode cannot be used as a half-wave rectifier. Which of the statements given above is/are correct?

(A) Only 1

(B) Only 3

(C) 1 and 2

(D) All of these

Correct Answer

(C) 1 and 2

[#27] Avalanche breakdown is due to

(A) collision of minority charge carrier

(B) increase in depletion layer thickness

(C) decrease in depletion layer thickness

(D) None of the above

Correct Answer

(B) increase in depletion layer thickness

[#28] Silicon is which type of material?

(A) Semiconductor

(B) Insulator

(C) Conductor

(D) No option is correct

Correct Answer

(A) Semiconductor

[#29] Consider the following statements. 1. Zener diode is not used as a voltage stabiliser. 2. A Solar cell is a p - n junction diode which converts electrical energy into solar energy. 3. LED is an important light source used in optical communication. Which of the statement given above is/are correct?

(A) Only 1

(B) Only 3

(C) 1 and 2

(D) All of these

Correct Answer

(B) Only 3

[#30] In a bi-polar junction transistor,

(A) all the three regions (the emitter, the base and the collector) have equal concentrations of impurity

(B) the emitter has the least concentration of impurity

(C) the collector has the least concentration of impurity

(D) the base has the least concentration of impurity

Correct Answer

(D) the base has the least concentration of impurity