Question # 1

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

The use of LDR is in the circuit of.

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Logic gate

Rectifier

Oscillator

High Switch

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

Identify the practical application of electrostatic force.

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Inkjet printer

x rays

Laser

A.C. Generator

SI unit of reactance is.

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Ohm

Mho

Farad

Henry

The peak value of A.C source is 20 A, then its rms value will be.

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14.1 A

10 A

20 A

28.2 A

One weber is equal to:

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N.A ²/m

N.m²/A

N.A/m

N.m/A

A pentaralent impurity in Si

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a free electron and a free hole

a free hole

a free electron

No free particle

Anti particle of electron is

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Proton

Photon

Neutron

Positron

An electron enters the magnetic field at right angle from left, B is into paper. The electron will be deflected.

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upward

To ward right

Down ward

Toward left

The free electrons experience force.

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In direction of -E

In direction of E

Both A and B

All of the above

Resistance tolerance of silver band is.

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10%

6%

7%

5%

The permeability of free space is measured in

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wb A/m

Am/wb

wb/Am

m/wbA

The first laser was built by

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ArthursSchawalow

T.H.Maiman

Peter Sorokin

C.H.Townes

Which one is photo conductor.

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Copper

Selenium

Mercury

Aluminium

Power dissipation in A.C circuit is expressed as:

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P =I_rms x V_rms Sinθ

IxVCosθ

I_rmsxV_rmsCosθ

I_rms x V_rms Sin2θ

In case of op-amp as an inverting amplifier, V₊ - V_- = 0, this is because

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Open gain loop is very low

Closed loop gain is very high

Open loop gain is very high

Both (a) and (a)

Study of hydrogen visible spectrum in

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1886

1887

1895

1885

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