Question # 1

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

How many isotopes of helium are present?

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1

2

3

4

The number of isotopes of hydrogen are

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2

1

3

4

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

none of these

Radiation detector are used to

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measure intensity of radiation

measure energy of radiation

difference between different types of radiation

all the above

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

Which of the following material has longer half life

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radium

polonium

radium

uranium

Referring to the above figure, the binding energy per nucleon increases upto mass number equal to:

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50

100

150

200

250

Neutron was discovered in

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1915

1920

1925

1932

1 amu is equal to.

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-24kg

1.66 x 10^-27kg

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