ppsc Chemistry lecturer past papers with answers pdf

PPSC Lecturer Chemistry Test 38 Online Preparation MCQs

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There will be 25 multiple choice question in the test.
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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 products is not derived from cellulose?

Insulin

Paper

Rayon

Gun cotton

2 / 25

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

500

1000

3 / 25

Which of the following compounds reduces Tollens' reagent?

Glucose

Sucrose

Acetic acid

Methanol

4 / 25

Mutarotation is a term related to

Number of monsaccharides in a carbohydrate

Relationship of D- and L- families

Interconversion of anomers

Hydrolysis of sucrose

5 / 25

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

it shows mutarotation.

it is the purest form of table sugar.

it is a hemiacetal.

it has a pyranose ring.

6 / 25

The monosaccharide obtained by hydrolysis of starch is :

D-Galactose

Maltose

D-Glucose

D-Ribose

7 / 25

Common table sugar is

Glucose

Maltose

Fructose

Sucrose

8 / 25

Which of the following statements is false about glucose?

it is a disaccharide.

it is a reducing sugar.

it has a pyranose form.

it is a polyalcohol.

9 / 25

Which of the following statements is false about an aldohexose?

It contains a potential aldehyde group.

Fructose is an aldohexose.

It is a monosaccharide.

α-D-Glucopyranose is an aldohexose.

10 / 25

Which of the following carbohydrates is sweeter than sucrose?

Fructose

Glucose

Lactose

None of these

11 / 25

All of the following monosaccharides give the same osazone except

Galactose

Glucose

Mannose

Fructose

12 / 25

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

because they are enantiomers

because they are geometrical isomers

in the configuration at C-1

because they are mirror images of each other

13 / 25

The mutarotation of glucose is characterized by :

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

a change from an aldehyde to ketone structure.

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

the presence of an intramolecular bridge structure.

14 / 25

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

None of these

Bromine water

Fehling's solution

Tollens' reagent

15 / 25

Which of the following carbohydrates is not a reducing sugar?

Sucrose

Lactose

ructose

Glucose

16 / 25

Glucose cannot be classified as

a hexose

an aldose

an oligosaccharide

a monosaccharide

17 / 25

The sugar that yields only glucose on hydrolysis is

Lactose

Fructose

Sucrose

Maltose

18 / 25

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

Sucrose

Glucose

Fructose

Maltose

19 / 25

α-D-Glucopyranose is a(n) :

ketal

hemiacetal

acetal

hemiketal

20 / 25

A reducing sugar will

not react with Fehling's test

always be a ketone

react with Fehling's test

have fewer calories

21 / 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

22 / 25

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

23 / 25

Which of the following statements is false about cellulose?

It is used in the manufacture of Dacron fibres.

It is a major component of cotton.

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

It is used in the manufacture of Rayon fibres

24 / 25

Starch

is a mixture of amylose + amylopectin.

is also called amylopectin.

is also called amylose.

is a trisaccharide.

25 / 25

Which of the following statements is false about sucrose?

It is also called table sugar.

It reduces Fehling's solution.

It may be fermented by yeast to produce alcohol.

It does not reduce Tollens' reagent.

Your score is

The average score is 0%

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