Question # 1

The SI unit of equivalent dose is

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Seivert

Gray

Radian

Rem

What will be excitation energy in the third orbit of hydrogen atom.

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0.66 eV

0.85 eV

1.5 eV

5.4 eV

In n-p-n transistor the current flows in the direction from

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Emitter to base

emitter to collector

Base to emitter

Base to collector

Which of the following detectors can count fast and operate at low voltage.

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G.M Counter

Cloud chamber

Solid state detector

Bubble chamber

The half life of a radioactive substance is 6 years What is the time taken by 12 g of this substance to decay completely.

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12 years

24 years

48 years

infinity

NOR gate is a combination of.

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OR gate and NOT gate

OR gate and AND gate

OR gate and OR gate

NOT gate and AND gate

The Inner electrons in heavy atoms can be disturbed and dislodged by.

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X rays

Alpha particle

Beta particles

gama particles

An emitter follower has

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High input impedance and high output impedance

High input impedance and low output impedance

Low input impedance and low output impedance

Low input impedance and high output impedance

the wavelength of continuous X-rays is inversely proportional to.

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Intensity of incident electron beam

Temperature of the target

Intensity of X-rays

The energy of electrons striking the target

Which term given below refers to the concept moving clocks run slower than clocks at rest w.r.t an observer.

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Simultaneously

Mass variation

time dilation

Length contraction

One gray is equal to.

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1 J-1 kg -1

1 J -1 kg -2

1 J 1 -g-1

1 j kg -2

An important property of an ideal power supply is.

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Infinite internal resistance

Zero internal resistance

Large output resistance

Small output resistance

The photons emitted in inner shell transition are.

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Alpha particle

Beta particle

Gama particle

Characteristic X-rays

Choose the one which acts as single inverter.

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Common emitter

common collector

Common base

Diode

Cobalt -60 is a radioactive element with half life of 5.25 years. What fraction of the original sample will be left after 26 years.

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1/4

1/8

1/16

1/32

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

The binding energy to pull the deuterium H apart into a proton and a neutron is equal to.

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1.22 MeV

2.22 MeV

3.22 Mev

4.22 MeV

Which of the following are electromagnetic waves.

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Alpha particles

Beta particles

Gama rays

Water waves

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

Cosmic rays mostly comprise of

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Neutral particles

Negative charged particles

Positively charged particles

Ions

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