1. Which is used to prevent Goitre disease?

A. Sodium Iodate B. Sodium Carbonate C. Sodium Benzoate D. Sodium Oxide

Answer: Option A
Explanation:
In 1924, launched a Goiter prevention program using iodized salt Sodium Iodate.
2. Two or more compounds having same molecular formula but different physical and chemical properties are called

A. Isotopes B. Isomers C. Isobar D. Isomerism

Answer: Option B
Explanation:
Each of two or more compounds with the same formula but a different arrangement of atoms in the molecule and different properties are called Isomers.
3. Bakelite is a ...................

A. Base B. Acid C. Polymer D. Solution

Answer: Option C
Explanation:
Bakelite is a synthetic resin chemically formulated and named after its Belgian inventor, Chemist L.H.Baekeland in 1909.
4. Synthetic fibre obtained from cellulose is known as .....................

A. Decron B. Nylon C. Teflon D. Rayon

Answer: Option D
Explanation:
Rayon is a manufactured regenerated cellulose fiber. It is made from purified cellulose, primarily from wood pulp, which is chemically converted into a soluble compound.
5. The Cetane number of diesel oil is ..........................

A. 65 B. 82 C. 75 D. 50

Answer: Option C
Explanation:
Cetane number or CN is an indicator of the combustion speed of diesel fuel. It is an inverse of the similar octane rating for gasoline (petrol).
CN of diesel oil = 75
6. ....................... is an ore associated with earth impurities like sand, rocks, and limestone

A. Gangue B. Slag C. Cuprite D. Galena

Answer: Option A
Explanation:
In mining, gangue is the commercially worthless material that surrounds, or is closely mixed with, a wanted mineral in an ore deposit.
7. Which of the following is used for killing Rats?

A. Zinc Sulphate B. Zinc Phosphide C. Zinc Nitrate D. Zinc Oxide

Answer: Option B
Explanation:
Zinc Phosphide rat poison kills by means of phosphine gas being released when the substance comes into contact with the stomach acids of the rat.
8. ...................... is also known as Baryta water

A. Barium Sulphate B. Barium Nitroxide C. Barium Oxide D. Barium Hydroxide

Answer: Option B
Explanation:
Barium hydroxide are chemical compounds with the chemical formula Ba(OH)2([latex]{H}_{2}[/latex]O)x. The monohydrate (x =1) is known as baryta, or baryta-water.
9. Which is used to write on paper?

A. Lead B. Graphite C. Carbon D. Hydrogen

Answer: Option A
Explanation:
Lead is a chemical element in the carbon group with symbol Pb and atomic number 82.
10. ..................... is used for artificial rain

A. Silver Chloride B. Silver Iodide C. Silver Nitrate D. Silver Oxide

Answer: Option B
Explanation:
The most common chemicals used for cloud seeding include silver iodide, potassium iodide, and dry ice.
11. ............................... is least compressible

A. Solid B. Gas C. Liquid D. All of these

Answer: Option A
Explanation:
Solid is least compressible Because their atoms are tightly packed.
12. Brass is a .............................

A. Heterogeneous Compound B. Homogenous Mixture C. Heterogeneous Mixture D. Homogenous Compound

Answer: Option B
Explanation:
Brass is a homogeneous mixture (solid solution) of copper and zinc. Again each metal by itself is a pure substance. Only when they are mixed on an atomic level are they a homogeneous mixture (or solid solution).
13. When steam is passed over hot coke, it produces which type of gas?

A. Mixed gas B. Tear gas C. Poisonous gas D. Synthesis gas

Answer: Option D
Explanation:
Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning.
14. Which acid is also known as the king of the acids?

A. Hydrochloric acids B. Citric Acids C. Sulphuric Acids D. Acetic acids

Answer: Option C
Explanation:
Sulphuric acid is called the king of chemicals because it has a large number of applications. It finds applications in manufacturing either directly or indirectly.
15. ......................is responsible for green color in fireworks

A. Tritium B. Barium C. Uranium D. Thorium

Answer: Option B
Explanation:
Barium is a chemical element with symbol Ba and atomic number 56. Barium compounds are added to fireworks to impart a green color.
16. Sea Weeds contain which of the following?

A. Carbohydrate B. Magnesium C. Calcium D. Iodine

Answer: Option D
Explanation:
Edible seaweeds accumulate iodine from seawater.
17. Which phosphorus is kept in water?

A. White B. Red C. Violet D. Green

Answer: Option C
Explanation:
Phosphorus exists in four or more allotropic forms: white (or yellow), red, and black (or violet). White phosphorus should be kept under water, as it is dangerously reactive in air, and it should be handled with forceps, as contact with the skin, may cause severe burns.
18. .............is a metal you can melt in the palm of your hand

A. Tin B. Zinc C. Gallium D. Nickel

Answer: Option C
Explanation:
Gallium is a metal you can melt in the palm of your hand from a solid into liquid form.
19. Annealing is done to ................................

A. Reduce brittleness B. Improve ductility C. Increase brittleness D. Both 1 and 2

Answer: Option D
Explanation:
Annealing is a heat process whereby a metal is heated to a specific temperature /color and then allowed to cool slowly. This softens the metal which means to improve ductility and reduce brittleness.
20. Gold is alloyed with ..................... to make it harder

A. Copper B. Magnesium C. Calcium D. Sodium

Answer: Option A
Explanation:
The pure gold is too soft on its own and is therefore hardened by the addition of alloying elements, copper, silver, nickel, palladium, and zinc.

1. The Wire of Flash bulb is made of ....................

A. Aluminium B. Magnesium C. Sodium D. Nickel

Answer: Option B
Explanation:
In 1893, Chauffour made an ancestor of the flash bulb; this had magnesium.
2. One Carat of diamond is equal to ........................

A. 200m B. 100m C. 150m D. 300m

Answer: Option A
Explanation:
One carat is equal to 0.2 grams.
3. Wood Spirit is which of the following ?

A. Ethyl Alcohol B. Propanol C. Methyl Alcohol D. Butanol

Answer: Option C
Explanation:
Wood spirit is a poisonous colorless liquid used as a solvent and fuel; ingestion may cause blindness or death. Called also methyl or wood alcohol.
4. Which of the following is chief source of Napthalene ?

A. Moth balls B. Mothflakes C. Tar Camphor D. Coal tar

Answer: Option D
Explanation:
Naphthalene is an organic compound with formula [latex]{C}_{10}[/latex][latex]{H}_{8}[/latex]. It is the simplest polycyclic. Naphthalene is the most an abundant single component of coal tar.
5. Fire fighting clothes are made of ......................

A. Asbestos B. Amosite C. Chrysotile D. Actinolite

Answer: Option A
Explanation:
A fire proximity suit is a suit designed to protect a firefighter from high temperatures, especially near fires of extreme temperature such as aircraft fires. Fire proximity suits first appeared during the 1930s and were originally made of asbestos.
6. If lime water is kept in the air, it turns milky due to the presence of

A. Magnesium Oxide B. Carbon dioxide C. Calcium Oxide D. Carbon monoxide

Answer: Option C
Explanation:
Carbon dioxide passed into limewater gives a milky solution. This is due to the insoluble suspension of calcium carbonate formed.
7. .................... type of fire extinguisher is used for petroleum fire

A. Wet Chemical B. Dry Powder C. Water D. Foam

Answer: Option D
Explanation:
Petroleum products are oil & lubricants, we will use foam extinguisher, as it will make a foam cover over the oil and hence cut off the oxygen supply.
8. Which of the following can form compounds?

A. Helium B. Neon C. Xenon D. Radon

Answer: Option C
Explanation:
Xenon, with a larger atomic mass, is able to form compounds (with fluorine, for example, to form XeF6).
9. The maximum permissible concentration of copper in drinking water is

A. 1 mg/L B. 0.5 mg/L C. 2 mg/L D. 0.2 mg/L

Answer: Option A
Explanation:
The aesthetic objective (AO) for copper in drinking water is 1.0 mg/L.
10. Au dissolves in ................

A. Solution B. Acids C. Water D. Aqua regia

Answer: Option D
Explanation:
Aqua regia dissolves gold, though neither constituent acid will do so alone, because, in combination, each acid performs a different task. Nitric acid is a powerful oxidizer, which will actually dissolve a virtually undetectable amount of gold, forming gold ions.
11. Which of the following is used in advertisement sign- boards and decorative lights?

A. Nitrogen B. Hydrogen C. Helium D. Neon

Answer: Option D
Explanation:
Neon lighting consists of brightly glowing, electrified glass tubes or bulbs that contain rarefied neon or other gases. Neon lights are a type of cold cathode gas-discharge light.
12. ............. is not a form of Carbon

A. Hematite B. Lonsdaleite C. Graphite D. Both 1 and 3

Answer: Option A
Explanation:
Hematite, also spelled as haematite, is the mineral form of iron(III) oxide (F[latex]{e}_{2}[/latex][latex]{O}_{3}[/latex]).
13. The Ore of Aluminum is

A. Galena B. Bauxite C. Aluminium Sulphtae D. Cinnbar

Answer: Option B
Explanation:
Bauxite ore is the world’s primary source of aluminum. The ore must first be chemically processed to produce alumina (aluminum oxide).
14. Calve rite is the ore of ...............

A. Aluminum B. Silver C. Gold D. Platinum

Answer: Option C
Explanation:
Calve rite is the ore of Gold. Gold is a chemical element with the symbol Au (from Latin: aurum) and the atomic number 79.
15. Which of the following is the ore of Mercury?

A. Rock Salt B. Glance C. Cinnbar D. Dolomite

Answer: Option C
Explanation:
Cinnabar and cinnabarite are used to produce liquid mercury (Quicksilver), crushed cinnabar ore is roasted in a rotary furnaces.
16. Calamine is the ore of which of the following?

A. Magnesium B. Sodium C. Sulphur D. Zinc

Answer: Option D
Explanation:
Zinc is a chemical element with symbol Zn and atomic number 30. It is the first element in group 12 of the periodic table. Calamine is a historic name for ore of zinc.
17. Bornite and Malachite is the ore of ...............

A. Calcium B. Copper C. Carbon D. Chlorine

Answer: Option B
Explanation:
The main ores of copper are chalcopyrite; bornite; malachite. The ores are extracted by either traditional mining (open pit or underground) or by leaching.
18. Which is/are the ore of Phosphorous?

A. Floreopetite B. Phosphoric acid C. Phosphorite D. Both A and C

Answer: Option D
Explanation:
Phosphorite, phosphate rock or rock phosphate is a non- the detrital sedimentary rock which contains high amountsof phosphate-bearing minerals. The phosphate content of phosphorite is at least 15 to 20%; if it is assumed that the phosphate minerals in phosphorite are hydroxyapatite and fluorapatite, phosphate minerals contain roughly 18,5 % phosphorus by weight.
19. ..................... is the ore of Calcium

A. Calcium Oxide B. Lime Stone C. Calve Rite D. Calcium Pyrites

Answer: Option B
Explanation:
Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). Most limestone is composed of skeletal fragments of marine organisms such as coral, forams, and mollusks.
20. Galena is the ore of which of the following?

A. Lead B. Carbon C. Nickel D. Mercury

Answer: Option A
Explanation:
Galena is a lead sulfide mineral with a chemical composition of PBS. It is the world’s primary ore of lead and is mined from a large number of deposits in many countries. It is found in igneous and metamorphic rocks in medium- to low- temperature hydrothermal veins.

1. Which is also known as Vermelium ?

A. HgS B. HgS[latex]{O}_{4}[/latex] C. Hg C[latex]{l}_{2}[/latex] D. HgO

Answer: Option A
Explanation:
Mercury sulfide, mercuric sulfide, mercury sulphide, or mercury(II) sulfide is a chemical compound composed of the chemical elements mercury and sulfur. It is represented by the chemical formula HgS. It is also known as Vermelium.
2. ........................ is also known as Marsh gas

A. Ethylene B. Acetylene C. Ethane D. Methane

Answer: Option D
Explanation:
Marsg gas is methane, especially as generated by decaying matter in marshes.
3. Calcium Sulphate is also known as ...........................

A. Quick lime B. Rock Salt C. Plaster of Paris D. Lunar Caustic

Answer: Option C
Explanation:
Calcium sulfate (or calcium sulphate) is the inorganic compound with the formula CaSO4 and related hydrates. In the form of γ-anhydrite (the anhydrous form), it is used as a desiccant. One particular hydrate is better known as plaster of Paris.
4. Marble is composed of ..................

A. Calcium carbonate B. Sodium Sulphate C. Calcium Oxide D. Calcium Sulphate

Answer: Option A
Explanation:
Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. It is composed primarily of the mineral calcite (CaCO3) and usually contains other minerals, such as clay minerals, micas, quartz, pyrite, iron oxides, and graphite.
5. Sugar Acid and .................. from natural sources were identical

A. Ferric Oxide B. Acetylsalicylic Acid C. Nitric Acid D. Oxalic acid

Answer: Option D
Explanation:
By 1784, Scheele had shown that “sugar acid” and oxalic acid from natural sources were identical.
6. Magnesium sulphate is also known as

A. Sugar Salt B. Balck Salt C. Bitter Salt D. Table Salt

Answer: Option C
Explanation:
Magnesium sulfate is an inorganic salt containing magnesium, sulfur and oxygen, with the formula MgSO4. It is also known as Bitter Salt.
7. Indian red is related to which chemical compound?

A. Ferric Oxide B. Nitric Acid C. Sulphuric Acid D. Nitrous Oxide

Answer: Option A
Explanation:
Indian red (color) Indian red is a pigment composed of naturally occurring iron oxides that is widely used in India.It is Ferric oxide.
8. Talc is a clay mineral composed of which of the following ?

A. Potassium Carbonate B. Magnesium Silicate C. Aluminum Acetate D. Sodium Silicate

Answer: Option B
Explanation:
Talc is a clay mineral composed of hydrated magnesium silicate with the chemical formula [latex]{H}_{2}[/latex][latex]{M}_{3}[/latex](SiO3)4 or M[latex]{g}_{3}[/latex]S[latex]{i}_{4}[/latex][latex]{O}_{4}[/latex](OH)2.
9. ..............is a popular name for Sodium Silicate

A. Water Glass B. Soluble Glass C. Sour Water D. Ideal Glass

Answer: Option B
Explanation:
The soluble glass is a popular name for sodium silicate or potassium silicate. Sodium silicate is the common name for compounds with the formula Na2(SiO2)nO. A well-known member of this series is sodium metasilicate, Na2SiO3. Also known as water glass or liquid glass.
10. Which of the following is the component of Pearl Ash ?

A. Calcium Carbonate B. Calcium Hydroxide C. Potassium Carbonate D. Methyl Alcohol

Answer: Option C
Explanation:
Potassium carbonate is the primary component of potash and the more refined pearl ash or salts of tartar.
11. Which of the following is used for separation and of purification of organic compounds ?

A. Chromatography B. Crystallization C. Osmosis D. Reverse Osmosis

Answer: Option A
Explanation:
To separate Organic compounds with the help of Column Chromatographic technique.It is useful methods for the separation and purification of both solids and liquids.
12. The blue color is related to.

A. Copper Oxide B. Cobalt Oxide C. Iron Oxide D. Lead Oxide

Answer: Option B
Explanation:
Cobalt(II) oxide or cobalt monoxide is an inorganic compound that appears as olive-green to red crystals, or as a greyish or black powder.
13. Crook’s glass contains which of the following?

A. Cerium Oxide B. Lead Oxide C. Tin Oxide D. Potassium

Answer: Option A
Explanation:
Crook’s glass contains cesium oxides.
14. Mn[latex]{O}_{2}[/latex] is used as a substance to make which color?

A. Pink B. Blue C. Violet D. Orange

Answer: Option C
Explanation:
Mn[latex]{O}_{2}[/latex] is a secondary alloy addition to steel and can make violet colored glass.
15. The green color is given by

A. Sodium Oxide B. Manganese Oxide C. Copper Oxide D. Chromium oxide

Answer: Option D
Explanation:
Chromium oxides are also used as a green color in glass making and as a glaze in ceramics.
16. .................. is known as fool’s gold

A. Iron Acetate B. Iron Oxide C. Iron Pyrite D. Iron Nitrate

Answer: Option C
Explanation:
The mineral pyrite, or iron pyrite, also known as fool’s gold, is an iron sulfide with the chemical formula FeS2.
17. Which is used to kill rats ?

A. Potassium Sulphate B. Zinc Nitrate C. Zinc Phosphate D. Zinc Phosphide

Answer: Option D
Explanation:
The dangers of zinc phosphide, a poison used to kill gophers and moles, has hit the press.
18. Silver Spoon is not used with boiling egg because it makes which of the following changes ?

A. Poisonous B. Colour changes C. Gas production D. Odour smell

Answer: Option B
Explanation:
A silver plate turn black when a boiled egg is placed on it.
19. ...................is also known as Flower of Zinc

A. ZnS B. ZnO C. ZnCl D. Zn[latex]{O}_{2}[/latex]

Answer: Option B
Explanation:
ZnO Also called flowers of zinc, philosopher’s wool.
20. Which of the following gas is used in Holme’s signals ?

A. Bromine B. Arsine C. Phosphine D. Fluorine

Answer: Option C
Explanation:
The spontaneous combustion of phosphine is technically used in Holme’s signals.

1. What is TNT ?

A. Triglycerides B. Trigonella C. Triphala D. Trinitrotoluene

Answer: Option C
Explanation:
Trinitrotoluene (TNT) is a pale yellow, solid organic nitrogen compound used chiefly as an explosive, prepared by stepwise nitration of toluene. Because TNT melts at 82° C (178° F) and does not explode below 240° C (464° F).
2. The Tyndall effect is related with _______________

A. Scattering B. Absorbtion C. Oxidation D. Absorption

Answer: Option A
Explanation:
The Tyndall effect, also known as Tyndall scattering, is light scattering by particles in a colloid or else particles in a very fine suspension. It is named after the 19th-century physicist John Tyndall.
3. Which of the following is also known as Picric acid ?

A. Trinitroglycerin B. Trinitrophenol C. Trinitrotoluene D. Nitroglycerin

Answer: Option B
Explanation:
Picric acid is an organic compound with the formula ([latex]{O}_{2}[/latex]N)3[latex]{C}_{6}[/latex][latex]{H}_{2}[/latex]OH. Its IUPAC name is 2,4,6-trinitrophenol.
4. The Permanent hardness of water is due to the presence of

A. Calcium B. Sulphate C. Chloride & Magnesium D. All of these

Answer: Option D
Explanation:
Temperary Hardness can be removed thermal treatment. It is due to the presence of Calcium, Megnesium, carbonate and bicarbonate ions. Same way Permanent hardness is due to the presence of Calcium, Megnesium, Sulphate and Chloride ions.
5. Which is of the following is the characteristics of Paraffin ?

A. Flammable B. Oily Liquid C. Colourless D. All of these

Answer: Option D
Explanation:
Medicinal liquid paraffin, also known as paraffinum liquidum, is a very highly refined mineral oil used in cosmetics and for medical purposes.
6. Ozone is __________________

A. Diamagnetic B. Paramagnetic C. Both 1 and 2 D. Either 1 or 2

Answer: Option A
Explanation:
Ozone is diamagnetic, which means that its electrons are all paired. In contrast, O2 is paramagnetic, containing two unpaired electrons.
7. A fossil fuel, petroleum is founded in which rocks?

A. Igneous rocks B. Sand rocks C. Sedimentary rocks D. Metamorphic rocks

Answer: Option C
Explanation:
A fossil fuel, petroleum is formed when large quantities of dead organisms, usually zooplankton and algae, are buried underneath sedimentary rock and subjected to both intense heat and pressure. Petroleum has mostly been recovered by oil drilling (natural petroleum springs are rare).
8. Which part of the gas flame is very hot?

A. White zone B. Luminous zone C. Dark Zone D. Non-luminous zone

Answer: Option D
Explanation:
The hottest part of the gas flame is non-luminous zone.
9. The inner core of the candle flame is initially in which colour ?

A. Light Blue B. Red C. Yellow D. Orange

Answer: Option A
Explanation:
The inner core of the candle flame is light blue, with a the temperature of around 1800 K (1500 °C). That is the hottest part of the flame. The color inside the flame becomes yellow, orange, and finally red.
10. Which of the following is used for swelling the bread ?

A. Oxygen B. Carbon-di-oxide C. Carbon monoxide D. Sodium Carbonate

Answer: Option B
Explanation:
As bread dough ferments and proves, the yeast produces carbon dioxide gas that causes the gluten network to expand. The gas responsible for swelling of bread is carbon di oxide.