Question # 1

1 atm = ?

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1 pascal

760 mm of Hg

1 atm

1 Nm^-2

Sodium - potassium alloy is used in nuclear reactor as a:

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catalyst

coolant

reactant

absorber

________________ orbital is more complex in shape.

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s

p

f

d

Free radical is a

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Extremely stable

Extremely reactive

Extremely inert

All of these

____________ is an irreversible cell.

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Dry cell

Chargeable cell

Zn cell

None of these

It is a good reducing agent

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Fe

H

C

O

There are _________ elements found till now .

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120

118

119

117

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

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cobalt-60

iodine-131

strontium-90

phosphorus-30

Which one of the following is heterogeneous mixture?

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milk

ink

milk of magnesia

sugar solution

Tyndall effect is due to:

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block of beam of light

non - scattering of beam of light

scattering of beam of light

passing through beam of light

Energy of a shell is ________________

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Variable

Constant

Cannot be changed

Nil

Gases produced in Nelson's cell are:

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H₂ and O₂

H₂ and CI₂

H₂ and N₂

CI₂ and O₂

.................... of an atom is not fixed.

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Size

Mass

Electronegativity

Nuclear char

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