Question # 1

Those elements whose charge number z is greater then __________ are unstable:

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80

79

82

83

Hydrogen bomb is an example of.

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Nuclear fission

Nuclear fusion

Chain reaction

Chemical reaction

James chadwick discovered:

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Proton

Positron

Neutron

Electron

Marie Curie and Pierre Curie discovered.

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Uranium

Uranium and Radium

Polonium and radium

Radium

If the following particle have the same energy, which particle has the shortest wave length.

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alpha particle

Neutron

Beta particle

Proton

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

The radio active nuclide ₈₆Ra²²⁸ decays by a series of emissions of three alpha particles and one beta particle. The nuclide X finally formed is:

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₆₄X²²⁰

₈₆X²²²

₈₄X²¹⁶

₈₈X²¹⁵

Radioactivity happen due to the disintegration of

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Nucleus

Mass

Electrons

Protons

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

The binding energy per nucleon is maximum for

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Helium

Iron

Potassium

Radium

The dead time of G.M tube is.

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10^-1 sec

10^-6sec

10^-4sec

10^-8sec

The charge of an alpha particle is equal to

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-e

+e

-2e

2e

The half life of radioactive elements depends upon

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Temperature

Nature of element

Amount of the radioactive substance

Pressure

A radio active substance has a half life of four months. 3 -fourth of the substance will decay in:

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6 months

8 months

12 months

16 months

One joule of energy absorbed per kilogram of a body is

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Roentgen

Grey

Rem

Curie

The charge on Beta particle is

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+e

-e

-2e

None of these

Two up quarks and one down quarks makes a

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Proton

Newton

Photon

Meson

Charge on an electron was determined by

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Ampere

Millikan

Maxwell

Bohr

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Physics ICS Part 2 Chapter 21 Online MCQ's Test MCQs With Answers

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