Question # 1

biology bis classified as ___________ science.

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Engineering

Physical

Natural

Chemical

Atoms reacts with each other because:

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They are attracted to each other

they are short of electrons

they want to attain stability

they want to disperse

Cathode rays are actually

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Electrons

Protons

Neutrons

Photons

The reverse of evaporation is:

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Boiling

Diffusion

Condensation

Freezing

Oxidation means

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Gain of oxygen

Removal of oxygen

Gain of hydrogen

Gain of electrons

The vapour pressure of a liquid increase with the:

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increase pressure

increase of temperature

increase of intermolecular forces

increase of polarity of molecules

It is heterogeneous mixture

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Sand

Milk

Air

Brass

Long form of periodic Table is constructed the basis of:

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Mendeleev postulate

atomic number

atomic mass

mass number

Nelson's cells used to prepare caustic soda along with gases. Which of the following gas is produced at cathode?

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CI₂

H₂

O₃

O₂

Mass no is represented by :

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A

B

C

D

Which shows Tyndall Effect?

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Slution

Colloid

Suspension

True solution

Atoms form chemical bonds to attain the electronic configuration of

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Halogens

Noble gases

Alkali metals

Alkaline earthmetals

Which one is moderate reactive metal?

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Pb

Na

Ca

Mg

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