Question # 1

Which of the following material has smaller has life

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uranium

polonium

radium

radian

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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decrease

increase

same

none of these

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

Neon gas have three isotopes whose atomic numbers are

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20, 24 , 23

20, 21 , 22

20, 19 , 21

none of these

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

Electrons are

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positive charged

negatively charged

massless

neutral

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

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