Question # 1

Which type of amplifier causes minimum drain of power supply.

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Class -A

Class -B

Class-C

Class -AB

When light of particular frequency is allowed to fall upon a metal surface electrons are emitted from a these emitted electrons are called.

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Photons

Holes

Quants

Photo electrons

A complete amplifier circuit made on a silicon chip and enclosed in a small capsule is

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Inductor

Metal detector

Diode

Operational amplifier

X-rays travel with

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The speed of light

The speed of sound

The speed of 3,000 m s-1

The speed of 3,500 m s-1

As oscillator is basically an amplifier with loop gain

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Zero

Infinity

Less than unity

More than unity

Current gain of a CE amplifier is 50, ITS hfe is about

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25

50

75

100

The critical mass of fissionable uranium -235 can be reduced by

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Adding impurities to it

Heating the material

surrounding it by neutron reflecting material

Surrounding it by neutron absorbing material

From which radiation it is most difficult to protect oneslelf.

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Alpha radiation

Beta radiation

Gama radiation

Heat radiation

Which of the following radiations can penetrate 20 cm thick steel.

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Alpha particles

Beta particles

Gama particles

Neutrons

Which of the following radiations will burn human skin

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Infrared

Ultraviolet

X rays

Alpha particles

Which particles have spin quantum number 1/2

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Mesons

Laptons

Hadrons

Muons

One particle having zero mass and zero charge is.

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Positron

Electron

Neutrino

Neutron

Emitter follower amplifier is an example of.

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Current series feedback

Voltage series feedback

Current shunt feed back

Voltage shunt feedback

The converse of pair production is

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Annihilation of matter

Materialization

Compton effect

Photo electric effect

A logic circuit with one input and one output that inverts the input signal at the output is.

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AND gate

NOT gate

OR gate

NOR gate

A logic circuit whose output signal is '1' when inputs are different is.

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NAND gate

NOR gate

Exclusive OR gate

Exclusive NOR gate

Push pull amplifiers employ

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One transistor

Two transistors

Three transistors

Four transistors

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

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Radiowaves

Alpha particles

Beta particles

gama particles

The angular speed of an electron in the nth orbit of Bohr's hydrogen atom is.

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Directly proportional to n

Directly proportional to n2

Inversely proportional to n

Inversely proportional to n2

The band width of an audio amplifier is.

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10 Hz to 10 kHz

20 Hz to 54 Hz

20 Hz to 20 kHz

20 Hz to 60 kHz

Which one of the following quantities is conserved in a nuclear reactor.

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Energy only

Mass only

Momentum only

Mass energy and momentum

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