Question # 1

A device which converts low voltage or current to high voltage or current is called.

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Transformer

AC generator

Amplifier

Rectifier

Pulsating output of full wave rectifier can be made smooth by using circuit called.

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Filter

Amplifier

Resistor

Transistor

The colour of light emitted by a LED depends on.

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It forward biased

Its reverse biased

Unbiased

None of these

In a certain circuit, I_{B = 40 µA,}I_C= 20 mA

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450 amp

0.45 amp

5 m amp

500 amp

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

A light emitting diode emits light only when

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Reverse biased

Forward biased

Unbiased

None of these

The gate, which changes the logic level to its opposite level is called

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NOR gate

AND gate

OR gate

NOT gate

Which device is used as a rectifier?

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Capacitor

Transistor

Diode

Transformer

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

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Physics Fsc Part 2 Chapter 7 Online Test MCQs With Answers

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