Question # 1

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

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

Electrons are

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positive charged

negatively charged

massless

neutral

Pair production take place when energy ofγ-rays photon is

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equal to 1.02 Mev-

greater than 1.02 Mev

less than 1.02 Mev

none of these

Radium was discovered by:

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Becquerel

Marie curie

Pierre curie

Rutherford

Both (B) and (C)

The chemical properties of an element depends upon the number of

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electron

position

photons

neutrons

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

Mass of proton is of order of

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10^-31gm

10^-27kg

10^-24gm

10⁺²⁷kg

γ-rays behave like a particle because they explain the

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Compton effect

Photoelectric effect

Pair-production

all the above

In 1932 Chadwick discovered

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proton

neutron

photon

electron

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

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600

7000

5000

15000

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

Rate of decay is actually described by.

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Half line

Decay constant

Mean life

Total life

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

Neutron was discovered in

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1915

1920

1925

1932

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

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