Question # 1

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

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

The time required for a radioactive material to decrease in active by one half is called

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half time

half life

disintegration time

mean life

A particle having the mass of electron and charge of a proton is called a

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photon

position

antiproton

antineutrino

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 diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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 energy acquired by a mass of 1g moving with the speed of light is

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3 x 10⁸J

9 x 10¹³J

3 x 10¹³J

9 x 10¹⁶J

Neutron was disvovered by:

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Rutherford in 1920

Chadwick in 1922

Bohr in 1913

Compton in 1927

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

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

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

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Frequency

Half life

Year

Mean life

None of these

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

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

Structure of the nucleus was explained by

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J.J Thomson

Bohr

Millikan

Rutherford

β-particles are easily deflected by collisions than heavy

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α-particles

β-particles

γ-particles

none of these

The half life of uranium-238 is

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6.2 x 10⁹years

4.5 x 10⁹days

4.5 x 10⁹years

1.3 x 10⁶years

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

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

Different radioactive material have

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same half lives

different half lives

same mean lives

same total lives

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

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3

2

6

5

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

Which are not the elementary particles?

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Photons

Leptons

Hadrons

Quarks

None of these

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

Gamma rays consist of steam of

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electron

proton

photons

all of these

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

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deuterium

protium

tritium

none of these

A mass spectrograph sort out

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molecules

atoms

elements

isotopes

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

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