Question # 1

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

Rutherford performed an experiment on nuclear reactions in:

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1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

After alpha decay the atomic number of the atom

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increase by four

decreases by two

increases by two

decrease by four

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

Neutron was discovered in

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1915

1920

1925

1932

If a nucleus emits an alpha particle, its mass number decreases by 4 while charge number decreased by

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-4

4

2

1

The nuclei of an element having the same charge number but different mass numbers are called:

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Isobars

Isotopes

Isomers

Isobaric

Isothermal

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

Maric Curie and Pieree Curie discovered two new radioactive elements, which are called

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polonium uranium

uranium and radium

polonium and radium

none of these

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

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

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