Question # 1

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

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decrease

increase

same

none of these

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

Charge on proton is

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1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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

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

For an atom having atomic number Z and atomic weight A, the number of electron in an atoms

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A - Z

A + Z

Z

A

The range of particle depends upon the factor

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charge, mass and energy of particle

density of medium

ionization potential of the atoms

all the above

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

Which of the following material has smaller has life

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uranium

polonium

radium

radian

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

In radio-active decay, the original element which disintegrate to another element is called

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element

daughter element

parent element

none of these

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

The rate of decay of a radioactive substance

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decrease exponentially with time

decreases linearly with time

increases linearly with time

increases exponentially with time

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