chemistry MCQs - 12th class Chapter 14 Mcqs

1

A polymer is a large molecule built up by the repetition of small units known as?

A

Mers

B

Monomers

C

Polymers

D

Dimers

2

Which of the following is an example of an inorganic giant molecule?

A

Proteins

B

Plastics

C

Graphite

D

Lipids

3

Who proposed the long chain formulas for polystyrene, rubber, and polyoxymethylene in the 1920s?

A

Carothers

B

Miescher

C

Watson

D

Staudinger

4

The number of repeating units in a polymer chain is known as the?

A

Degree of Polymerization (DP)

B

Molecular Mass

C

Monomer Count

D

Chain Index

5

A polymer formed from the polymerization of a single type of monomer is called a?

A

Copolymer

B

Terpolymer

C

Homopolymer

D

Monomer

6

Which type of polymer can be softened repeatedly when heated and hardened when cooled?

A

Thermosetting

B

Elastomer

C

Thermoplastic

D

Resin

7

The polymerization process suggested by W.H. Carothers in 1929 includes addition and what other type?

A

Substitution

B

Elimination

C

Condensation

D

Reduction

8

Addition polymerization is a free-radical reaction that involves initiation, propagation, and which other step?

A

Conclusion

B

Termination

C

Continuation

D

Formation

9

Condensation polymerization usually involves the removal of a small molecule, such as?

A

Oxygen

B

Hydrogen

C

Carbon dioxide

D

Water

10

Polyvinyl Chloride (PVC) is obtained by polymerizing which monomer?

A

Vinyl Acetate

B

Styrene

C

Vinyl Chloride

D

Propylene

11

What is added to PVC to improve its flexibility?

A

A catalyst

B

A plasticizer

C

An inhibitor

D

A monomer

12

Polystyrene is used in the manufacture of?

A

Pipes

B

Adhesives

C

Textile fibres

D

Food containers

13

Polyvinyl Acetate (PVA) is mostly used as?

A

A structural material

B

An adhesive material

C

A fuel source

D

A coating for tanks

14

Acrylic resins are based largely on which monomer?

A

Acrylonitrile

B

Styrene

C

Vinyl Chloride

D

Adipic Acid

15

Polyester resins are formed from the reaction of a diol and what other type of molecule?

A

Aromatic bi-functional acid

B

Polyamine

C

Epichlorohydrin

D

Amino acid

16

What is the generic name for synthetic polyamides?

A

Polyester

B

Terylene

C

Nylon

D

Rayon

17

Nylon 6,6 is formed from hexamethylene diamine and which other monomer?

A

Adipic acid

B

Styrene

C

Maleic acid

D

Acrylic acid

18

Epoxy resins are made by condensing epichlorohydrin with?

A

Adipic acid

B

Diphenylolpropane

C

Hexamethylene diamine

D

Ethane 1,2 diol

19

The most abundant biomolecules on earth are?

A

Lipids

B

Proteins

C

Nucleic Acids

D

Carbohydrates

20

Monosaccharides, which are simple sugars, have an empirical formula of (CH2O)n where 'n' is at least?

A

1

B

2

C

3

D

4

21

Which of the following is an example of a ketose monosaccharide?

A

Glucose

B

Glyceraldehyde

C

Fructose

D

Mannose

22

The linkage formed when two monosaccharide units combine is called a?

A

Peptide linkage

B

Ester linkage

C

Glycosidic linkage

D

Hydrogen bond

23

Which of the following is a common table sugar and a disaccharide?

A

Lactose

B

Maltose

C

Starch

D

Sucrose

24

Which disaccharide occurs in the milk of all animals?

A

Sucrose

B

Lactose

C

Maltose

D

Raffinose

25

Which of the following is an amorphous, tasteless polysaccharide?

A

Glucose

B

Fructose

C

Sucrose

D

Cellulose

26

Plants store glucose as starch, while animals store it in the form of?

A

Cellulose

B

Glycogen

C

Sucrose

D

Lactose

27

Natural starch is a mixture of amylose and what other component?

A

Amylopectin

B

Glucose

C

Cellulose

D

Glycogen

28

Which component of starch gives a deep blue colour with iodine?

A

Amylopectin

B

Amylose

C

Glucose

D

Cellulose

29

Cotton is composed of 99% of which structural polysaccharide?

A

Starch

B

Glycogen

C

Chitin

D

Cellulose

30

Proteins are nitrogeneous compounds made up of a variable number of?

A

Amino acids

B

Fatty acids

C

Nucleotides

D

Monosaccharides

31

The most abundant proteins in the animal kingdom, forming 25-35% of body protein, are?

A

Albumins

B

Globulins

C

Collagen proteins

D

Legumin

32

In conjugated proteins, the non-protein group attached to the protein is called a?

A

Co-enzyme

B

Prosthetic group

C

Apoenzyme

D

Substrate

33

The sequence of amino acids in a peptide chain refers to which structure of a protein?

A

Primary

B

Secondary

C

Tertiary

D

Quaternary

34

The disruption of protein structure by heat or a change in pH is known as?

A

Hydrolysis

B

Denaturation

C

Saponification

D

Polymerization

35

Which protein acts as a carrier of oxygen in the body?

A

Insulin

B

Keratin

C

Haemoglobin

D

Myosin

36

Lipids are naturally occurring organic compounds that are soluble in?

A

Water

B

Acids

C

Bases

D

Non-polar solvents

37

Fats and oils are triesters formed from fatty acids and which alcohol?

A

Ethanol

B

Methanol

C

Glycerol

D

Propanol

38

Glycerides with a higher proportion of unsaturated fatty acid components are typically?

A

Fats (solid)

B

Waxes (hard)

C

Oils (liquid)

D

Resins (brittle)

39

The hydrolysis of a fat or an oil with an alkali to form soap is called?

A

Esterification

B

Hardening

C

Saponification

D

Rancidity

40

The process of converting a liquid oil into a semi-solid fat by adding hydrogen is known as?

A

Saponification

B

Hydrolysis

C

Hardening

D

Cracking

41

The number of milligrams of KOH required to saponify one gram of fat is its?

A

Iodine Number

B

Acid Number

C

Saponification Number

D

Rancidity Value

42

The extent of unsaturation in a fat or oil is expressed by its?

A

Acid Number

B

Iodine Number

C

Saponification Number

D

Hydroxyl Value

43

The parent nucleus of steroids consists of a total of how many carbon atoms?

A

12

B

15

C

17

D

20

44

Which steroid, when irradiated with UV rays, is converted into vitamin D2?

A

Cholesterol

B

Ergosterol

C

Testosterone

D

Cortisol

45

Enzymes are reaction catalysts of biological systems and are typically what type of macromolecule?

A

Carbohydrates

B

Lipids

C

Nucleic Acids

D

Proteins

46

The protein component of an enzyme is called the?

A

Co-factor

B

Co-enzyme

C

Apoenzyme

D

Substrate

47

What suffix is typically added to the name of the substrate to name an enzyme?

A

-in

B

-ase

C

-ose

D

-ol

48

The temperature at which an enzyme reaction occurs the fastest is called its?

A

Boiling point

B

Melting point

C

Absolute temperature

D

Optimum temperature

49

Which of the following is a nitrogenous base found in RNA but not in DNA?

A

Adenine

B

Guanine

C

Thymine

D

Uracil

50

The double-stranded structure of DNA was first deduced by?

A

Staudinger and Carothers

B

Watson and Crick

C

Miescher and Kossel

D

Sanger and Pauling