Question # 1

Radioactivity was discovered by

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Rutherford

Henri Becqureal

Maxwell

James Chadwick

Fraction of the decaying atoms per unit time is called

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decay atom

decay element

decay constant

decay

Charge on neutron is

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1.6 x 10^-19C

zero

-1.6 x 10^-19C

1.2 x 10^-19C

Three quarks make:

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An electron

A meson

A baryon

A photon

None of these

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

Marie curie and Pierre curie discovered:

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Uranium

Polonium

Radium

Both (A) and (C)

Plutonium

An alpha particle has a charge of

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+2e

-2e

-e

+3e

γ-rays are

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electrostatic waves

electromagnetic waves

heavy particles

longitudinal waves

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

Neutrons are

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positive charge

negatively charged

massless

neutral

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

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600

7000

5000

15000

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 diameter of an atom is of the order

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10^-125m

10^-11m

10^-10m

10^-9m

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

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

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3

2

6

5

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

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