Question # 1

Meniscus is the shape of the surface of a liquid in a cylindrical container:

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meniscus may be convex

meniscus is concave

meniscus may be convex or concave depending upon the nature of metal

meniscus is plane

Enzymes are chemically

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carbohydrates

proteins

fatty acids

phospholipids

Newspaper can be recycled again and again by how many times

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5

4

2

3

Most complex structure of protein is

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Primary protein

Secondary protein

Tertiary protein

Quaternary protein

Which one of the following is used as coagulant for purification potable water

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

Equal volumes of gases at the same temperature and pressure contain equal number of particles.This statement is direct consequence of

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Perfect gas law

Partial law of volumes

Charle's law

Ideal gas equation

Surface and ground water sources are contaminated by various human activities. Which of the following is not human activity that causes contamination in fresh water

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Live stock waste

Oil leaks and spills

Desposal of industrial effluents

Rain

Photo chemical smog contains _________ as main reactants:

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nitrons oxide and unburnt hydrocarbons

niliric oxide and unburnt hydrocarbons

NO and burnt hydrocarbons

N₂O and burnt hydrocarbons

The pressure exerted by the vapours in equilibrium with its pure liquid at given temperature is called the

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equilibrium pressure

atmospheric pressure

vapour pressure

external pressure

Which is not a calcareous material?

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lime

clay

marble

marine shell

The no. of Ip's on oxygen in CO are

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1

3

4

2

Neutron was discovered by:

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Chadwick.

Bohr.

Rutherford.

Plank.

The high molecular weight materials which yield on hydrolysis the amino acids is called:

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Carbohydrates

Lipids

Fatty acids

Proteins

Octane number can be changed by

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Isomerisation

Alkylation

Cyclisation

All of these

Alkyl halides are reactive :

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High

Medium

Less

Least

Which of the following d-block elements can show the highest oxidation number in its compounds

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Chromium

Copper

Nickel

Manganese

Acetic acids react with PCI5 giving:

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Acetamide

Acetyl chloride

Alcohol

Ether

In primary alkyl halides, the halogen atom is attached to a carbon which attached to how many carbon atoms?

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Two

Three

One

Four

Which metal of Group-II A of the periodic Table, will form the least ionic chloride

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Be

Mg

Ca

Sr

Internal energy of a system is equal to

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Kinetic energy of particles

Potential energy due to binding forces between particles

Sum of kinetic energy plus potential energy of the particles

Heat contents

The self linking property of carbon is called as

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Linking polymerization

Addition

Catenation

Elimination

Generally the bond formed by metals with non-metals is

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Ionic

Covalent

Polar

Non- polar

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