Question # 1

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

The penetration power ofβ-particle is

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zero

less thanα-particle

equal toα-particle

greater thanα-particle

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 properties of all the isotopes of an elements are

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same

different

slightly different

none of these

The half life of radioactive substances depends upon

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amount of substance

energy of substance

state of substance

temperature of substance

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

Hydrogen atom with only one proton in its nucleus, and one electron in its orbit is called

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deuteron

deterium

protium

tritium

An alpha particle has a charge of

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+2e

-2e

-e

+3e

Rutherford performed an experiment on nuclear reactions in:

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1718 A.D

1818 A.D

1918 A.D

2001 A.D.

1701 A.D.

The number of protons inside a nucleus is called

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mass number

atomic weight

atomic number

none of these

The most abundant isotope of neon is

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neon-20

neon-21

neon-22

neon-23

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

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 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

The unit of decay constant is

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sex

sec²

sec^-1

sec^-2

The distance travelled byα-particle in a medium before coming to rest, is called

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range ofγ-particle

range of neutrons

range of particle

none of these

When certain nucleus emits aβ-particles, is mass number:

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Remain same

Increases by one

Decreases by one

Decreases by four

None of these

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

A curie represents a very strong source of

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α-particle

β-particle

γ-particle

none of these

According to Rutherford atomic model, the positive charge in an atom

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is concentrated at its centre

is in the form of positive electron at same distance from its centre

is spread uniformly through its volume

none of these

Proton was discovered by Rutherford in

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1915

1906

1910

1920

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

None of these

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

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

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

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

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

The nucleus/nuclei of hydrogen is/are:

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Proton

Deuteron

Triton

All of these

None of these

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

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Frequency

Half life

Year

Mean life

None of these

In wilson cloud chamber, the air becomes saturated with:

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Alcohol vapours

Water

Helium gas

Nitrogen gas

None of these

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