Question # 1

The maximum energy of emitted photoelectron is measured by

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the largest potential difference they can traverse

The current they produce

The potential difference they produce

The speed with they emerge

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

The energy equivalent of 1 kg of matter a

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10^-15 J

1 J

10¹²J

10¹⁷ J

On which factor cut off wavelength of X-rays coming from a Coolidge tube depends upon.

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Target material

Accelerating voltage

Filament temperature

Separation between target and the filament

The bunding energy per nucleon for iron is.

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zero

Maximum

Negative

Minimum

The energy that must be added to separate the nucleus is called.

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Critical energy

Binding energy

Gravitational energy

Electrostatic energy

Which of the following has greatest binding energy per nucleon.

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Normal hydrogen

Deuterium

Tritium

Helium-4

The X-rays coming from a X-rays tube

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Is monochromatic

Has all wavelengths smaller than a certain maximum wavelength

Has all wavelengths greater than a certain maximum wavelength

has all wavelengths minimum than a certain maximum wavelength

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 BJT configurations used for signal inversion.

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CE

CC

CB

BE

Sub atomic particles which experience strong nuclear force are.

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Leptons

Hadrons

Mesons

Quarks

Lines of Balmer series are emitted by hydrogen atom when the electron jumps from

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The first orbit to any other orbit

Higher orbits to second orbit

Higher orbits to first orbit

The third orbit to higher orbit

The Rutherford atom according to classical theory is

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Stable

Unstable

Partially stable

Quantized

Which is the famous standard model of the universe.

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the big bang

Casmos

Astronaut

The small stap

In a fission reactor which particle causes a uranium -235 nucleus to split.

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Alpha particle

Gama ray

Neutron

Proton

Which particle are not emitted by a radioactive substance.

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Alpha particles

Beta particles

Gama particles

Neutrons

The emission of photons by a metal when electrons are incident is called.

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Photo electric effect

Pair production

X-rays production

Gama ray production

The constant lamda is called the.

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Decay constant

Gas constant

Planck's constant

Dose constant

Radioactive substances do not emit

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Alpha particles

Beta particles

Gama rays

Neutrons

A spectroscope sorts out

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Atoms

Molecules

Elements

Isotopes

Which uranium isotope having the atomic weights as given below is easily fissionable.

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234

235

236

238

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