Question # 1

Neon gas have three isotopes whose atomic numbers are

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20, 24 , 23

20, 21 , 22

20, 19 , 21

none of these

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

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

The range ofβ-particle in air is greater than that ofα-particle by

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1000 times

100 times

15 times

10 times

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

The counter, which also provides the power to the G.M. tube is called:

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Thin mica window

thin glass window

Airy window

Wooden window

None of these

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

Electrons are

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positive charged

negatively charged

massless

neutral

1 amu is equal to

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-34kg

1.66 x 10^-27kg

How many isotopes of helium are present?

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1

2

3

4

The emission of radiations take place in elements, having charge number greater than

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109

82

69

52

Phenomenon of radioactivity is due to disintegration of

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nucleus

neutron

proton

molecule

Which of these is not a radiation detector

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Wilson cloud chamber

cyclotron acceleration

Geiger Miller counter

solid state detector

The total charge of any nucleus is given as

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Ze²

Z²e

Z/e

Ze

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 missing mass which is converted to energy in the formation of nucleus, is called

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packing fraction

mass defect

binding energy

none of these

When a nucleus emits an alpha particles, its charge number decreases by

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3

2

6

5

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

When a charged particle passes through matter, it produces ionization, this effect is used in

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fission reaction

reactor

radiation detector

fusion reaction

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

The number of isotopes of hydrogen are

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2

1

3

4

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

In 1932 Chadwick discovered

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proton

neutron

photon

electron

The energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

The nucleus left after the emission of some radiation is called:

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Parent nucleus

Daughter necleus

Mother necleus

Any of these

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

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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