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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

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

Bromine water

None of these

Fehling's solution

Tollens' reagent

2 / 25

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

Maltose

Sucrose

Fructose

Glucose

3 / 25

A reducing sugar will

react with Fehling's test

always be a ketone

have fewer calories

not react with Fehling's test

4 / 25

Which of the following carbohydrates is sweeter than sucrose?

Lactose

None of these

Glucose

Fructose

5 / 25

Which of the following products is not derived from cellulose?

Insulin

Rayon

Gun cotton

Paper

6 / 25

All of the following monosaccharides give the same osazone except

Galactose

Mannose

Fructose

Glucose

7 / 25

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

it has a pyranose ring.

it is the purest form of table sugar.

it shows mutarotation.

it is a hemiacetal.

8 / 25

The sugar that yields only glucose on hydrolysis is

Fructose

Maltose

Sucrose

Lactose

9 / 25

Starch

is a trisaccharide.

is also called amylose.

is also called amylopectin.

is a mixture of amylose + amylopectin.

10 / 25

Common table sugar is

Glucose

Maltose

Fructose

Sucrose

11 / 25

Which of the following statements is false about glyceraldehyde?

Its IUPAC name is 1,2-dihydroxypropanal

It shows mutarotation

It is optically active

It is isomeric with 1,3-dihydroxypropanone

12 / 25

Which of the following statements is false about sucrose?

It may be fermented by yeast to produce alcohol.

It does not reduce Tollens' reagent.

It reduces Fehling's solution.

It is also called table sugar.

13 / 25

Glucose cannot be classified as

a hexose

a monosaccharide

an oligosaccharide

an aldose

14 / 25

Which of the following statements is false about cellulose?

It is used in the manufacture of Rayon fibres

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

It is used in the manufacture of Dacron fibres.

It is a major component of cotton.

15 / 25

Which of the following statements is false about an aldohexose?

It is a monosaccharide.

It contains a potential aldehyde group.

α-D-Glucopyranose is an aldohexose.

Fructose is an aldohexose.

16 / 25

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

17 / 25

The monosaccharide obtained by hydrolysis of starch is :

D-Galactose

D-Ribose

D-Glucose

Maltose

18 / 25

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

because they are geometrical isomers

because they are enantiomers

because they are mirror images of each other

in the configuration at C-1

19 / 25

Which of the following carbohydrates is not a reducing sugar?

Sucrose

ructose

Lactose

Glucose

20 / 25

Which of the following statements is false about glucose?

it has a pyranose form.

it is a disaccharide.

it is a polyalcohol.

it is a reducing sugar.

21 / 25

α-D-Glucopyranose is a(n) :

hemiketal

acetal

ketal

hemiacetal

22 / 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

23 / 25

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

1000

500

24 / 25

The mutarotation of glucose is characterized by :

a change from an aldehyde to ketone structure.

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

the presence of an intramolecular bridge structure.

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

25 / 25

Which of the following compounds reduces Tollens' reagent?

Methanol

Glucose

Acetic acid

Sucrose

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