Question # 1

Enzymes consist of

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proteins only

proteins and non-protein parts

fats only

futs and non-fatty components

Hydrosphere includes

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Seas and rivers

Ocean & polar ice caps

Ground water

All of above

A maltose molecule is formed by the combination of:

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two glucose molecules

one glucose and one fructose

molecule

one glucose and one galactose

Which forms metallic crystals

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Cu

NaCI

SO₂

NH₄CI

Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation

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AI

Hg

As

Cr(vi)

Forms of waste products:

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Heat

Smoke

Solid

All of these

How many electrons have to be removed to ionize 1.0 x 10(-6) moles of Ne atoms to Ne+ ions in a neon advertising tube:

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6.02x10ê23/1.0x10ê-6

1.0x 10ê-6 x 6.02x 10ê23

1.0x10ê-6 x 6.02×10ê23/20.2

1.0x10ê-6 x 6.02x10ê23/9.65x10ê-1

The hexagonal closed packing is associated with

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Ag, Cu, Au

Zn, Cd, Hg

Li, Na, K

NaCl, KBr

Which one of the following enzymes brings about the hydrolysis of fats?

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urease

maltase

zymase

lypase

Carboxylic acids can be prepared from:

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Oxidation of alkane

Oxidation of alcohols

Oxidation of aldehydes

All of these

A polymer may be

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Linear

Branched

Cross linked

All of these

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

Which of the following compounds gives red precipitate with AgNO₃?

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Kl

K₂CrO₄

NaBr

NaNO₃

A system undergoes a change to attain the state of

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High energy

Low energy

Moderate energy

None of these

Ethanal may be converted into a three-carbon acid in a two-step process.

Which compound is the intermediate

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CH₃CO₂H

CH₃CN

CH₃CH₂CN

CH₃CH(OH)CN

The unit of rate of reaction is

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mole dm^-3

mole Kg^-1

moles dm^-3sec^-1

grams dm^-3

Natural fertilizers are materials derived from

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Plants only

Animals only

Both plants and animals

None of these

Amino acids are buildng blocks of:

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protein

Carbohydrates

Lipids

fats

Which of the following synthetic fertilizer do not make soil acidic

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Urea

Thin urea

Ammonium phosphate

Potassium nitrate

Carbon monoxide is harmful to human beings as it

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Is carcinogenic

Is antagonistic to CO₂

Has higher affinity for hemoglobin as compared to oxygen

Is destructive to O₃

Lime, calcium oxide, is used in agriculture for

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Adding ca metal in soil

Making soil acidic

Neutralizing acidic soil

Adding oxygen to soil

Glycine at pH7 has the structure

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H₂N -- CH₂-- COOH

H₃N⁺-- CH₂-- COOH

H₂N -- CH₂COO^-

H₃N⁺-- CH₂-- COO^-

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