Question Bank for 12th Class Physics Semiconducting Devices A. R. (MCQs) - Semiconductor Electronics: Materials, Devices and Simple Circuits

1)

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): The number of electrons in a p-type silicon semiconductor is less than the number of electrons in intrinsic silicon semiconductor at room temperature.

Reason (R): It is due to law of mass action.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true but R is NOT the correct explanation of A

C)

A is true but R is false

D)

A is false and R is true

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2)

Assertion (A): The resistivity of a semiconductor decreases with temperature.

Reason (R): The atoms of a semiconductor vibrate with larger amplitude at higher temperature there by increasing it's resistivity.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true but R is NOT the correct explanation of A

C)

A is true but R is false

D)

A is false and R is true

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3)

Assertion (A): As the temperature of a semiconductor increases, its resistance decreases.

Reason (R): The energy gap between conduction band and valence band is small.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true but R is NOT the correct explanation of A

C)

A is true but R is false

D)

A is false and R is true

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4)

Assertion (A): Silicon is preferred over Germanium for making semiconductor devices.

Reason (R): The energy gap of Germanium is more than the energy gap of Silicon.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true but R is NOT the correct explanation of A

C)

A is true but R is false

D)

A is false and R is true

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5)

Assertion (A): Semiconductors do not obey Ohm's law.

Reason (R): V-I characteristic of semiconductors is linear.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true but R is NOT the correct explanation of A

C)

A is true but R is false

D)

A is false and R is true

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6)

Assertion (A): Zener diode is used as a voltage regulator.

Reason (R): Zener diode operated in reverse biased condition.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true but R is NOT the correct explanation of A

C)

A is true but R is false

D)

A is false and R is true

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7)

Assertion (A): Ideal diode shows zero resistance in forward bias and infinite resitance in reverse bias.

Reason (R): Depletion region of a p-n junction diode extends in reverse bias and contracts in reverse bias.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true but R is NOT the correct explanation of A

C)

A is true but R is false

D)

A is false and R is true

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8)

Assertion (A): When diode is used as a rectifier, its specified reverse breakdown voltage should not be exceeded.

Reason (R): When p-n junction diode crosses the reverse break down voltage, it get destroyed.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true but R is NOT the correct explanation of A

C)

A is true but R is false

D)

A is false and R is true

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9)

Assertion (A): When a p-n junction diode is reverse biased, a feeble reverse current flows known as reverse saturation current.

Reason (R): In reverse bias condition, the minority carries can cross the junction.

A)

Both A and R are true and R is the correct explanation of A

B)

Both A and R are true but R is NOT the correct explanation of A

C)

A is true but R is false

D)

A is false and R is true

View Solution

12th Class Physics Semiconducting Devices Question Bank

done A. R. (MCQs) - Semiconductor Electronics: Materials, Devices and Simple Circuits Total Questions - 9

Study Package

A. R. (MCQs) - Semiconductor Electronics: Materials, Devices and Simple Circuits

A. R. (MCQs) - Semiconductor Electronics: Materials, Devices and Simple Circuits Total Questions - 9