Question # 1

LDR becomes necessary when op amp is used as a

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Night switch

Inverter

Comparator

Rectifier

The output voltage of a rectifier is.

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Smooth

Pulsating

Alternating

Per featly direct

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

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Filter

Amplifier

Resistor

Transistor

Photodiode is used for:

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Detection of current

Detection of heat

Detection of light

Both a & b

The chargeless region after formation of Pn junction is called:

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Free region

Depletion region

Field region

U.V region

Output resistance of an op amp is

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High

Low

Zero

Equal to input resistance

Depletion region carries.

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-ve charge

+ve charge

Ions

No charge

A diode characteristics curve is a plot between

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Current and resistance

Voltage and time

Voltage and current

Current and time

Base of transistor is of order:

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10^-11m

10⁶m

10^-8m

10^-6m

The ratio of potential barriers of Ge to Si at room temperatrue is.

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7:3

1:3

2:5

3:7

Photo diode detects.

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Visible light

Radio waves

X rays

All of them

In a transistor, collector current is controlled by:

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Collector voltage

Base current

Collector resistance

All of the above

The symbol of p-n-p transistor is

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The p-n junction in which p side is connected to+ive and n-side is -ve the junction is said to be:

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Neutral

Forward biased

Reversed biased

None of above

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

For rectification we use.

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Transformer

Diode

Choke

Generator

When a PN-Junction is reverse biased the depletion region is.

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Widened

Narrowed

Normal

None of these

The impurity in the germinium is usually in the ratio of

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1:10⁶

1:10⁴

1:10⁸

1:10¹⁰

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