Question # 1

The most suitable material for moderator in a nuclear reactor is.

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B

Cd

D2O

Uranium

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

A spectroscope sorts out

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Atoms

Molecules

Elements

Isotopes

The SI unit of radioactivity is.

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Becquerl

Curie

Joule

rutherford

According to Max. Planck, energy is released or absorbed in discrete packets called.

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quanta

Meson

Energy shells

Position

The half life of a radioactive substance depend on.

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Pressure

Temperature

Amount of substance

No external influences

The path of electron in Rutherford atomic model according to classical theory a.

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Parabolic

Straight line

Spiral

Circular

The mass of an helium nucleus is equal to.

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2.0015 u

3.0015 u

4.0015 u

5.0015 u

The neutral atoms of all isotopes of the same element contain the same numbers of.

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Electrons and protons

Electrons and neutrons

Neutrons

Neutrons and protons

The electrons behave as waves, because they can .

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Produce ions in gases

Diffracted by a crystal

Be deflected by electric fields

Be deflected by magnetic fields

Sub atomic paticles whihc does not experience strong nuclear force are.

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hadrons

Photons

Leptons

Nucleons

Induced fission result from the absorption of

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electron

Proton

Nucleon

Neutron

Marie Curie and Pierre Curie discovered two new radioactive elements which are.

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Uranium and radkum

Platinum and radium

Polonium and radium

Crypton and radon

In radiotherapy X-rays are used to.

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Treat cancer

Delect bone fracture

Cure heart diseasee

All of the above

Half life and mean lifetime of a radioactive element are.

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Equal to each other

Inversely proportional to each other

Directly proportional to each other

Not related to each other

The continuous x rays spectrum is obtained due to

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Deceleration of impact electrons

Breaking potential

Excitation potential

Ionization potential

The tunnel effect makes possible

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Alpha decay

Gama rays

Positive Beta decay

negative Beta dacay

The maximum K.E of photo electrons depends upon

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Energy of incident radation

Frequency of incident radiation

Wavelength of incident radiation

Mass of incident radiation

In order to reduce uncertainty in momentum one must use light of.

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Short wavelength

Large wavelength

Wavelength of intermediate value

Wavelength of any value

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

Which both elements are good for nuclear fission.

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Thorium an uranium

Thorium and radium

Plutonium and uranium

Plutonium and throrium

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