Question # 1

What water freezes at 0∘ , Its density decreases dues to:

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cubic structure of ice

empty spaces present in the structure

change of bond lengths

change of bond angles

The amount of oxygen in the lithosphere is about

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35.50%

40.60%

46.60%

50.50%

Which of the following is Homopolymer

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Polyvinyl acetate

Acrylic resin

Polyester resins

Both A and C

An amino acid exists in the form of Zwitter-ion Which has:

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one - ve charge

one + ve charge

two + ve carges

one + ve and one -ve

Which of the follwing dnes not give brick red precispitate wits Fehling's solution

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Acetaldehyde

Formalin

prorionaldehyde

Acetone

If rate of diffusion of A is 5 times that of B,what will be the density ratio of A and B?

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1/25

1/5

25

5

Which is the optimum temperature for the activity of enzyme?

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20 - 35°C

10 -15°C

55 - 70°C

35 - 55°C

Silk is an example of:

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animal fiber

vegetable fiber

mineral fiber

none of all

The substance added to the soil to provide one or more nutrient elements which are necessary plant growth are known as:

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Harmones

minerals

fertilizers

none of above

On hydrolysis sucrose gives

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Glucose and maltose

Fructose and lactose

Fructose and maltose

Glucose and fructose

Ozone in most of the tropical regions acts as a pollutant and cause

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damages to eyes

aggravates asthma

chest discomfort

all of these

Formula of chloroform is

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CH₃CI

CCI₄

CH₂CI₂

CHCI₃

Simple sugars are :

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Monosacchrides

Disaccharides

Oligo saccharides

Trisaccharides

When chloroform is boiled with NaOH, it gives

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Formic acid

Trihydroxymethane

Acetylene

Sodium formate

The molarity of toluene solution in benzene is 0.22 if 5 grams of toluene dissolved, then mass of benzene is grams is

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267

260

240

247

Which reagent will distinguish a ketone from an aldehyde

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Br₂

2, 4-dinitrophenylhydrazine

NaBH₄

Tollen's reagent

The number of bonds in nitrogen molecule is

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Oneφ and one π

Oneφ and two π

three sigma only

Two φ and one π

A solution can be

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Dilute and concentrated

Saturated and dilute

Saturated and unsaturated

Supersaturated and saturated

Phosphide ion has the electronic structure similar to that of

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Nitride ion

Fluoride ion

Sodium ion

Chloride ion

When a carbon atom forms single bonds with other carbon atoms, these hybrid orbitals overlap with the orbitals of hydrogen to form four bonds which are

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Three sigma and one P_i

Two sigma and two P_i

One sigma and three P_i

sigma

Number of elements in the first period of the periodic table are

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Two

Four

One

Eight

Objects of the size of an atom can be observed in

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An electron microscope

An x-ray spectrum

Atomic absorption spectrum

A visible spectrum

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