Question # 1

The figure 1.007276μ shows the mass of an:

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Atom

Positron

Electron

Neutron

Proton

The nucleous of uranium -235 differs from a nucleous of a uranium -238 in that the later contains

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3 more neutrons

3 more electrons

3 more protons

3 more ions

The half lie of radium-226 is

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238 years

4.5 x 10⁹days

1620 years

332 years

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 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

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

Gamma rays consist of steam of

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electron

proton

photons

all of these

The number of isotopes of hydrogen are

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2

1

3

4

Curie is a unit of

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reluctance

resistivity

binding energy

radioactivity

Nucleus consists of

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proton and neutron

protons and electron

electron and neutron

protons only

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

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

The chemical properties of all the isotopes of an elements are

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same

different

slightly different

none of these

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 mass spectrograph sort out

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molecules

atoms

elements

isotopes

Radioactivity is

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self disruptive activity

spontaneous activity

exhibited by all elements under proper conditions

both 'a' and 'b'

When thorium nucleus emits aβ-particle, the daughter nucleus is called:

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Protactinium

Actinium

Uranium

Radium

Redon

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

An alpha particle has a charge of

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+2e

-2e

-e

+3e

There is present in paraffin a large amount of:

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Nitrogen

Hydrogen

Carbon

Baryllium

Lithium

In 1932 Chadwick discovered

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proton

neutron

photon

electron

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

In his experiment on nuclear reactions, Rutherford bombardedα particles on:

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Nitrogen

Hydrogen

Lead

Oxygen

Krypton

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

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

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

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

During the nuclear changes, the law/s of conservation that hold/s are that of:

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Charge

energy

Momentum

Mass

All of these

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

When radioactive nucleus emits aβ-particle, the proton-neutron ratio

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decrease

increase

same

none of these

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