Question # 1

In 9th century scientist accepted by:

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Dalton

Bohars

Rutherford

Nil

___________ is used in treatment of cancer.

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Cobalt-60

C-12

H-3

Nil

The boiling point of H2O is:

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100

12

1.105

9

When U-235 breaks up, it produces?

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electrons

neutrons

protons

nothing

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 lowest energy level is

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K

L

M

N

Which one of the following shell consists of three subshells?

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K- shell

M-Shell

L-shell

M-shell

Half life of C-14 ________________ years.

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5800

5700

5600

5500

The isotopes C-12 is present in abundance of:

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96.6%

97.6%

99.7%

None of these

First energy level is denoted by:

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K

L

M

N

The isotopes of an element have different number of

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Electrons

Protons

Neutrons

Protons & Neutrons

The p subshell has:

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one orbital

two orbitals

three orbitals

four orbitals

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

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