Lecturer Chemistry MCQs

PPSC Lecturer Chemistry Test 38 Online Preparation MCQs

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Test Instructions:-
Test Name	Lecturer Chemistry
Subject	Chemistry Test 38
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC LECTURER OF CHEMISTRY TEST NO. 38

1 / 25

Which of the following statements is false about cellulose?

It is a polymer of glucose molecules joined in β-1,4 linkages.

It is used in the manufacture of Rayon fibres

It is used in the manufacture of Dacron fibres.

It is a major component of cotton.

2 / 25

α-D-Glucopyranose is a(n) :

acetal

hemiacetal

ketal

hemiketal

3 / 25

A reducing sugar will

always be a ketone

have fewer calories

not react with Fehling's test

react with Fehling's test

4 / 25

The reagent that can be used to differentiate an aldose and a ketose is :

None of these

Fehling's solution

Tollens' reagent

Bromine water

5 / 25

α-D-Glucose is different from β-D-glucose

because they are mirror images of each other

because they are geometrical isomers

because they are enantiomers

in the configuration at C-1

6 / 25

Which of the following carbohydrates is sweeter than sucrose?

Fructose

Glucose

Lactose

None of these

7 / 25

The monosaccharide obtained by hydrolysis of starch is :

D-Galactose

D-Glucose

D-Ribose

Maltose

8 / 25

All of the following monosaccharides give the same osazone except

Glucose

Fructose

Galactose

Mannose

9 / 25

Starch

is also called amylose.

is a mixture of amylose + amylopectin.

is a trisaccharide.

is also called amylopectin.

10 / 25

Which of the following products is not derived from cellulose?

Insulin

Gun cotton

Rayon

Paper

11 / 25

Which of the following statements is false about glyceraldehyde?

It is isomeric with 1,3-dihydroxypropanone

It is optically active

Its IUPAC name is 1,2-dihydroxypropanal

It shows mutarotation

12 / 25

Glucose cannot be classified as

an oligosaccharide

a hexose

an aldose

a monosaccharide

13 / 25

Which of the following carbohydrates is not a reducing sugar?

Glucose

Sucrose

ructose

Lactose

14 / 25

Which of the following compounds reduces Tollens' reagent?

Methanol

Sucrose

Glucose

Acetic acid

15 / 25

Which of the following statements is false about α-D-glucose?

it has a pyranose ring.

it shows mutarotation.

it is the purest form of table sugar.

it is a hemiacetal.

16 / 25

The sugar that yields only glucose on hydrolysis is

Sucrose

Lactose

Maltose

Fructose

17 / 25

By approximately what factor is the sweetness of saccharin greater than that of sugar?

1000

500

18 / 25

Mutarotation is a term related to

Number of monsaccharides in a carbohydrate

Relationship of D- and L- families

Hydrolysis of sucrose

Interconversion of anomers

19 / 25

The number of asymmetric carbon atoms in the α-D-glucopyranose molecule is :

20 / 25

Which of the following statements is false about glucose?

it is a reducing sugar.

it is a disaccharide.

it has a pyranose form.

it is a polyalcohol.

21 / 25

Which of the following statements is false about sucrose?

It reduces Fehling's solution.

It does not reduce Tollens' reagent.

It may be fermented by yeast to produce alcohol.

It is also called table sugar.

22 / 25

Common table sugar is

Maltose

Fructose

Sucrose

Glucose

23 / 25

Which of the following statements is false about an aldohexose?

α-D-Glucopyranose is an aldohexose.

It is a monosaccharide.

Fructose is an aldohexose.

It contains a potential aldehyde group.

24 / 25

The mutarotation of glucose is characterized by :

a change from an aldehyde to ketone structure.

a change of specific rotation from a (+) to a (–) value.

the irreversible change from α-D to the β-D form.

the presence of an intramolecular bridge structure.

25 / 25

Which of the following carbohydrates will not give a red precipitate of Cu2O when heated with Benedict's solution?

Maltose

Glucose

Fructose

Sucrose

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