Question # 1

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

Proton was discovered by Rutherford in

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1915

1906

1910

1920

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

For an atom having atomic number Z and atomic weight A, the charge on the nucleus is

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A - Z

A + Z

Z

A

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 reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

If 'V' is the relativistic speed and 'C' is the speed of light then according to Einstien the factor V/C must always be

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Equal to 1

Less than 1

Greater than 1

Infinity

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The number of isotopes of hydrogen are

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2

1

3

4

Radioactivity was discovered by:

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Becquerel

Marie curie

Pierre curie

All of them

None of these

Radioactivity

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is exhibited more by semiconductors in general

in exhibited more by the element when they are coupled

with other radioactive elements by a covalent bond

is an atomic property of radioactive elements

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

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

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