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

Induced fission result from the absorption of

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electron

Proton

Nucleon

Neutron

At high temperature a body generally emits redactions of.

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Small wavelengths

Long wavelengths

Moderates wavelengths

Zero wavelengths

The decay to form other nuclides by emitting particles and electromagnetic radiations by unstable nuclides is called.

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Nuclear stability

Radioactivity

Carbon dating

Spontaneously

The process of pair production will take place if the energy of photon is greater than

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0.21 MeV

0.51 MeV

1.51 MeV

1.21 MeV

A transistor consists of.

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One p-n junction

Two p-n junctions

Three p-n junctions

Four p-n junction

X-rays used for

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Cutting boring and precision welding

Retina stitching in eye operations

Detecting heavy elements under the earth

Deflecting flaws in welding and casting

The nucleus of tritium is called.

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Proton

Triton

Deuleron

Positron

Which of the following is deflected by an electric field.

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Alpha particles

X rays

Gama rays

Neutrons

There are how many types of forces or interactions.

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Two

Three

Four

Five

In a Nuclear reactor which material is often used as modeerator.

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Water

Graphite

Uranium

Water and graphite

In the experiment of photo electric effect the minimum frequency of photons at which electrons are emitted from a metal surface is called.

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Critical frequency

Typical frequency

Threshold frequency

Surface frequency

Which six particles and their antiparticles interact by the weak interaction.

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Leptons

Hadrons

Muons

pi mesons

In a transistor which one is very thin.

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Collector

Emitter

Base

Depletion region

Which of the following propagates at the same speed as velocity of light.

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Heat waves

Sound waves

Shock waves

Beta particles

The half life of uranium -238 is

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1620 years

4.5 x 10⁹years

3-8 days

23.5 minutes

Half life of a radioactive elements 10 minutes If the initial cont. rate is 368 counts per minute for what time count rate reaches 32 counts per minute.

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20 minutes

40 minutes

80 minutes

120 minutes

The converse of pair production is

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Annihilation of matter

Materialization

Compton effect

Photo electric effect

During the alpha decay process

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A neutron is emitted

a electron is emitted

A helium core is emitted

A proton core is emitted

The SI unit of decay constant is.

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m

m-1

s-1

N m-1

Which of the following are electromagnetic waves.

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Alpha particles

Beta particles

Gama rays

Water waves

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