Question # 1

The number of all the protons and neutrons in a nucleus is known as

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atomic number

mass number

charge number

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

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

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

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600

7000

5000

15000

Gamma rays consist of steam of

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electron

proton

photons

all of these

Radiation detector are used to

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measure intensity of radiation

measure energy of radiation

difference between different types of radiation

all the above

The amount of energy equivalent to 1 a.m.u is

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9.315 Mev

93.15 Mev

931.5 Mev

2.22 Mev

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

A mass difference of 0.0012 u is equivalent to and energy of:

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0.5 Me V

1.13 MeV

5.13 MeV

1.13 keV

1.13 eV

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

In radioactive decay, the new element which is formed due to the disintegration of original element is called

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element

daughter element

parent element

none of these

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

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