Question # 1

According to Bohr, electrons can revolve only in this orbits whose angular momentum is

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h/2π

n 2h/π

n h2/2π

n h/2π

Electron ________________ energy when they jump from low to higher level.

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Absorb

Radiate

Nothing

Nil

The boiling point of H2O is:

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100

12

1.105

9

L shell can accommodate ________________ electrons.

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2

8

18

32

The no.of neutrons in deutrium is

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1

2

3

4

________________ proposed that matter is composed of small particles.

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Greek

English's

Russian

Nil

________________ orbital is more complex in shape.

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s

p

f

d

The isotopes of an element have different number of

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Electrons

Protons

Neutrons

Protons & Neutrons

Deuterium is used to make:

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light water

heavy water

soft water

hard water

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

Which of the following can accommodate 18 electrons?

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K

L

M

N

Which radioisotope is used for the diagnosis of tumor in the body?

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cobalt-60

iodine-131

strontium-90

phosphorus-30

Who discovered the proton?

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Goldstein

J.J Thomson

Neil Bohr

Ruther Ford

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