UPSC,PCS,CDS,NDA /General Science - Chemistry MCQs Part1 Sample Test,Sample questions

Question:
Choose the correct statement:

1.Tooth enamel is made up of calcium phosphate

2.Tooth decay starts when the pH of the mouth is lower than 5.5

3. Both a and b

4.None

Posted Date:-2021-02-21 06:39:16


Question:
If the mass of an atom is 37 and atomic number is 17, then what shall be number of neutrons and protons in it?

1.17 Neutrons, 17 Protons

2.20 Neutrons, 17 Protons

3.17 Neutrons, 20 Protons

4. 37 Protons, 17 Neutrons

Posted Date:-2021-02-21 06:39:16


Question:
What is the reason for different molecular arrangements as per VSEPR theory?

1. To minimize mutual repulsion

2.To minimize mutual attraction

3.To minimize surface tension

4.To have the minimum area

Posted Date:-2021-02-21 06:39:16


Question:
Most liquids that conduct electricity are solutions of acids, base and which of the following?

1.Aluminium

2.Copper

3.Iron

4.Salts

Posted Date:-2021-02-21 06:39:16


Question:
What happens to a helium atom when it loses an electron?

1. It becomes an alpha particle

2. It becomes a negative helium Ion

3. It becomes a positive Helium ion

4.It becomes a proton

Posted Date:-2021-02-21 06:39:16


Question:
What happens to the molar conductivity of a weak electrolyte in case of dilution?

1.No change

2.increases slowly

3. increases steeply

4. decreases slowly

Posted Date:-2021-02-21 06:39:16


Question:
What is the bond angle in case of Ammonia molecule?

1.120°

2. 150°

3.66°

4.107°

Posted Date:-2021-02-21 06:39:16


Question:
What is the dipole moment in BF3 molecule?

1.0

2.1

3.1.85

4.6.22

Posted Date:-2021-02-21 06:39:16


Question:
What is the H-C-H bond angle in a methane molecule?

1.120°

2. 75°

3.109.5°

4.150°

Posted Date:-2021-02-21 06:39:16


Question:
What is the process of conversion of solid state directly to gaseous state called?

1.Distillation

2.Condensation

3. Sublimation

4.Evaporation

Posted Date:-2021-02-21 06:39:16


Question:
What is the product of the reaction between Ethanol and excess concentrated sulphuric acid at 443K?

1. Ethane

2. Ethene

3.Ethyne

4.Methane

Posted Date:-2021-02-21 06:39:16


Question:
What is the S.I unit of Molar conductivity?

1.S m3 mol-2

2.S m2 mol-2

3. S m-1 mol2

4.S m2 mol-1

Posted Date:-2021-02-21 06:39:16


Question:
What is the status of total energy at any time during the interconversion of energy from one form to other forms?

1.The total energy remains constant.

2.The total energy remains zero.

3.The total energy remain increasing.

4.The total energy remain decreasing.

Posted Date:-2021-02-21 06:39:16


Question:
What is used as a sowing agent in the preparation of soft drinks?

1.Phosphorus acid

2. Boric acid

3.Benzoic Acid

4.Phosphoric acid

Posted Date:-2021-02-21 06:39:16


Question:
What percentage of Human body is made up of carbon?

1.12

2.18.5

3.28.8

4.44.2

Posted Date:-2021-02-21 06:39:16


Question:
Which among the following metals is used for galvanization?

1.Zinc

2.Copper

3.Silver

4.Iron

Posted Date:-2021-02-21 06:39:16


Question:
Which element helped James Chadwick to discover Neutron?

1.Lithium

2.Beryllium

3.Boron

4.Carbon

Posted Date:-2021-02-21 06:39:16


Question:
Which Indian scientists invented crescograph, a device for measuring the growth in plants?

1.Prafulla Chandra Ray

2.Sir Jagadish Chandra Bose

3.Venkatraman Ramakrishnan

4.C. N. R. Rao

Posted Date:-2021-02-21 06:39:16


Question:
Which is the main source of Naphthalene?

1.Charcoal

2.Camphor

3.Coal-tar

4.Titanium

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following comprises a standard hydrogen electrode?

1.a copper electrode coated with carbon black

2.an iron electrode coated with platinum black

3.a platinum electrode coated with platinum black

4.a gold electrode coated with carbon black

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following features are considered for a compound to be aromatic?

1.Planarity

2.Complete delocalisation of the π electrons in the ring

3.Presence of (4n + 2) π electrons in the ring where n is an integer

4.All of the above

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following gas is also known as laughing gas?

1.Nitrous oxide

2.Nitrogen dioxide

3.Nitrogen hydroxide

4.Nitrogen peroxide

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following gases were called Fixed Air by Scottish physician Joseph Black which is discovered in 1750s?

1.Oxygen

2.Carbon Dioxide

3.Methane

4.Nitric Oxide

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following hydrocarbon is the source of Natural rubber?

1.isoprene

2. Benzene

3.Butene

4.Methanol

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following is a polymer of amino acids?

1.Starch

2. Cellulose

3. Proteins

4.None of the above

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following is a property of Alkanes?

1. Alkanes are unreactive at normal conditions

2. Alkanes are also known as Paraffins

3. Both a and b

4.None

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following is correct about Aromatic hydrocarbons?

1. They are also called as Arenes

2. They are polar molecules

3. Aromatic hydrocarbons are miscible in water

4. All of the above

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following is not an example of Allotrope?

1.Steel

2.Graphite

3.Diamond

4.Charcoal

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following is the process to remove calcium and magnesium from hard water?

1.Filtration

2.Flocculation

3.Sedimentation

4.Water softening

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following is used as a food preservative?

1.Table salt

2.Salts of sorbic acid

3.Sodium benzoate

4.All of the above

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following metal is the key component of Vitamin B12?

1. Iron

2.Zinc

3.Copper

4. Cobalt

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following metals is commonly used to increase the strength of steel alloys?

1.Bismuth

2. Boron

3.Tin

4.Molybdenum

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following monomers produce Buna-n polymer?

1. two parts of butadiene and styrene

2.four parts of butadiene and one part of isobutylene

3. two parts of butadiene and one part of acrylonitrile

4.None of the above

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following non-metals is used in the manufacturing of match sticks?

1.Carbon

2.Nitrogen

3.Sulphur

4.Phosphorous

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following represents Reduction?

1. Losing one or more electrons

2.Gaining one or more electrons

3. Losing Hydrogen atoms

4.Liberating hydrogen gas

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following represents Reduction?

1.Losing one or more electrons

2.Gaining one or more electrons

3.Losing Hydrogen atoms

4. Liberating hydrogen gas

Posted Date:-2021-02-21 06:39:16


Question:
Which of the following represents the bond order in Molecular orbital theory?

1. half the difference between the number of bonding and antibonding electrons

2.twice the difference between the number of bonding and antibonding electrons

3.the difference between the number of bonding and antibonding electrons

4. the sum of the number of bonding and antibonding electrons

Posted Date:-2021-02-21 06:39:16


Question:
Which of these drugs is called as the ‘love drug’?

1. Mescalin

2. MDMA

3.Dextromethorphan

4.Ketamine

Posted Date:-2021-02-21 06:39:16


Question:
Which of these polymers is produced by a condensation reaction between ethylene glycol and ortho-phthalic acid?

1.Neoprene

2.Teflon

3.Poly ethelene glycol phthalate

4.None of the above

Posted Date:-2021-02-21 06:39:16


Question:
Which of these polymers is used for controlled drug release in the body?

1.PLA

2.PHBV

3.PGA

4. PCL

Posted Date:-2021-02-21 06:39:16


Question:
Which one of the following forms the chief constituent of Vinegar?

1.Formic acid

2.Acetic acid

3.Salicylic acid

4. Oxalic acid

Posted Date:-2021-02-21 06:39:16


Question:
Which one of the following is not a Type of coal?

1.Lignite

2.Siderite

3.Anthracite

4. Peat

Posted Date:-2021-02-21 06:39:16


Question:
Which two elements are combined to form candles?

1. Paraffin Wax and Stearic Acid

2.Bees Wax and Stearic Acid

3. Higher Fat Acids and Stearic Acid

4. Bees Wax and Paraffin Wax

Posted Date:-2021-02-21 06:39:16


Question:
Who discovered electron?

1.J. chadwick

2.Ernest Rutherford

3.J.J.Thomson

4.E.Goldstein

Posted Date:-2021-02-21 06:39:16


Question:
Who discovered that water is composed of two parts hydrogen and one part oxygen by volume?

1. Pierre Robiquet

2.Joseph Louis Gay-Lussac

3.Henri-Victor Regnault

4.Georges Urbain

Posted Date:-2021-02-21 06:39:16


Question:
Who is the author of the book “The Sceptical Chymist” that made distinction between chemistry and alchemy and marked beginning of modern Chemistry?

1.Oswald Croll

2.Edward Dyer

3.Georg Brandt

4.Robert Boyle

Posted Date:-2021-02-21 06:39:16


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