Question # 1

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

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cobalt-60

iodine-131

strontium-90

phosphorus-30

The other name of modern periodic table is ________________ of periodic table.

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Long form

Simplified

Simplest

Nil

Free radical is a

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Extremely stable

Extremely reactive

Extremely inert

All of these

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

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Absorb

Radiate

Nothing

Nil

Which one metal can be cut with a knife?

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Na

Mg

AI

Ca

The boiling point of H2O is:

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100

12

1.105

9

Metals lose their electrons easily because:

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They are electronegative

They have electron affinity

They are electropositive

Good conductors of heat

The number of proton in an atom is called _________ number.

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Molecule

Formula

Atomic

Molar

positive ion hare formed by _________ of electrons.

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Gain

Loss

Sharing

Bonding

___________ is used in treatment of cancer.

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Cobalt-60

C-12

H-3

Nil

In ________________ Bohr considered hydrogen atom for his model .

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1913

1916

1917

1918

Sodium is exterminate reactive metal, but it does not react with:

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Hydrogen

Nitrogen

Sulphur

Phosphorus

The atomic radil of the elements in periodic table:

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increase form left to right in period

increase form top to bottom

do not change form left to right in period

decrease form top to bottom in a group

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