Question # 1

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Which of the following material has smaller has life

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uranium

polonium

radium

radian

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

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 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

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

For an atom having atomic number 'Z' and atomic weight 'A', the number of neutrons in the nucleous is

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A - Z

A

Z

A + Z

The chemical behaviour of an atom is determined by

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binding energy

atomic number

mass number

number of isotopes

When certain nucleus emits anα particle, its mass number:

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Increases by one

Decreases by one

Remain same

Decreases by four

None of these

How many isotopes of helium are present?

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1

2

3

4

How much time, theα-particle more massive than an electron

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600

7000

5000

15000

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