Question # 1

Alfa particles are

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hydrogen nuclei

helium nuclei

electrons

photons

U-238 present in the natural uranium is about:

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59%

0.007%

99%

39%

19%

Nucleon means:

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Only electrons

Only neutrons

Only protons

Both (A ) and (C)

Both (B) and (C)

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

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

Proton was discovered by Rutherford in

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1915

1906

1910

1920

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

In 1932 Chadwick discovered

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proton

neutron

photon

electron

Which of the following material has longer half life

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radium

polonium

radium

uranium

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

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

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

The rate of decay of radioactive substance

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is constant

decrease exponentially with time

varies inversely as time

decreases linearly with time

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

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3

2

6

5

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

Electrons are

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positive charged

negatively charged

massless

neutral

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total 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

Neutron was suggested to be in the nucleus by:

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Rutherford in 1920

Bohar in 1913

Dirac in 1928

Anderson in 1932

None of these

The unit of decay constant is:

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Second

Metre

Hour

Year

Second^-1

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

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600

7000

5000

15000

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

For Protium, the mass defect is:

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Infinite

Zero

Very large

A few grams

None of these

The diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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

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

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109

82

69

52

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

A pair of quark and antiquark makes a:

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Meson

Baryon

Proton

Neutron

None of these

Binding energy per nucleus is

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greater for heavy nucleus

least for heavy nucleus

greatest for light nuclei

decreases for medium weight niclei

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

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