Question # 1

Atoms of elements combine chemically to form:

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Mixtures

compounds

solutions

ions

The value of Planck's constant is

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6.63 x 10-34 Js

6.63 x 10-32 Js

6.63 x 10-30 Js

6.63 x 10-28 Js

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

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cobalt-60

iodine-131

strontium-90

phosphorus-30

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

Which one of the following shell consists of three subshells?

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K- shell

M-Shell

L-shell

M-shell

The no.of neutrons in deutrium is

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1

2

3

4

Who discovered the proton?

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Goldstein

J.J Thomson

Neil Bohr

Ruther Ford

In ________________ Bohr considered hydrogen atom for his model .

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1913

1916

1917

1918

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

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Absorb

Radiate

Nothing

Nil

The maximum no.of electrons that can be accommodated in M shell are

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2

8

18

32

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

The number of isotopes of carbon are

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1

2

3

5

In a discharge tube, the pressure of a gas is kept at

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10-2 atm

10-4 atm

10-6 atm

10-8 atm

In 9th century scientist accepted by:

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Dalton

Bohars

Rutherford

Nil

The lowest energy level is

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K

L

M

N

________________ proposed that matter is composed of small particles.

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Greek

English's

Russian

Nil

Alpha particles are double charged.

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Negative

Positive

Can be both

Nil

The number of electrons in K shell of O is ________________

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9

10

2

1

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