Question # 1

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

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1000 times

100 times

15 times

10 times

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

An alpha particle has a charge of

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+2e

-2e

-e

+3e

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

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109

82

69

52

Beta particles are

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hydrogen nuclei

helium nuclei

electrons

photons

The range of particle depends upon the factor

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charge, mass and energy of particle

density of medium

ionization potential of the atoms

all the above

1 amu is equal to.

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1.66 x 10^-24kg

1.66 x 10^-19kg

1.66 x 10^-24kg

1.66 x 10^-27kg

The energy is found from Einstein's mass energy relation is called

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binding energy of electron

binding energy of proton

binding energy of neutron

binding energy of nucleus

Examples of moderators used in a fission reactor is/are:

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Water

Heavy water

Carbon

Hydrocarbon

All of these

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

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600

7000

5000

15000

The reciprocal of decay constant λ of a radioactive material is:

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Frequency

Half life

Year

Mean life

None of these

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

Mass of proton is

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1.67 x 10^-27kg

1.67 x 10^-31kg

1.66 x 10^-34kg

1.67 x 10^-17kg

Charge on proton is

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1.59 x 10^-9C

1.59 x 10^-7C

-1.59 x 10^-19C

1.59 x 10^-19C

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

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

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

Nuclei that have the same charge number but different mass number are called

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isotones

isomers

isotopes

isobars

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

How many isotopes of helium are present?

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1

2

3

4

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

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 mass of the nucleus is always less than the total man of the protons and neutron that make up the nucleus. The difference of the two masses is called

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nuclear fission

nuclear fusion

man defect

radioactivity

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

Mass of neutron is

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1.67 x 10^-31kg

1.67 x 10^-27kg

9.1 x 10^-31kg

1.67 x 10^-19kg

Gamma rays consist of steam of

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electron

proton

photons

all of these

Neutron was discovered by

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Curie

Roentgen

Chadwick

Rutherford

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

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