McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 601. |
J. B. Sumner isolated first enzyme from Jackbeans as- |
| A. | amylase |
| B. | trypsin |
| C. | urease |
| D. | renin |
| Answer» C. urease | |
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Explanation: James Batcheller Sumner (November 19, 1887 – August 12, 1955) was an American chemist. He discovered that enzymes can be crystallized. |
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| 602. |
Highest percentage of carbon is found in which form of coal? |
| A. | Anthracite |
| B. | Bituminous |
| C. | Peat |
| D. | Lignite |
| Answer» A. Anthracite | |
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Explanation: Anthracite is the highest rank of coal since it has a carbon content of over 87% on a dry ash-free basis. Anthracite coal generally has the highest heating value per ton on a mineral-matter-free basis. It has a bright luster and breaks with a semi-conchoidal. fracture. |
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| 603. |
The chemical that is used to ripen mangoes is - |
| A. | Calcium sulphide |
| B. | Calcium carbide |
| C. | Calcium carbonate |
| D. | Calcium chloride |
| Answer» B. Calcium carbide | |
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Explanation: Calcium carbide is used for artificially ripening fruit. When calcium carbide comes in contact with moisture, it produces acetylene gas, which is quite similar in reaction to the natural ripening agent ethylene. Acetylene acts like ethylene and accelerates the ripening process. |
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| 604. |
Which of the following is not a nitrogenous fetiliser? |
| A. | Ammonium sulphate |
| B. | Urea |
| C. | Ammonium nitrate |
| D. | Superphosphate |
| Answer» D. Superphosphate | |
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Explanation: Superphosphateis a common synthetic phosphorus fertilizer. It contains phosphorus and sulphur in a ratio of 1 to 1.22. It is produced by treatment of "phosphate rock" with acids such as sulphuric acid. Superphosphate is the principal carrier of phosphate, the form of phosphorus usable by plants, and is one of the world's most important fertilizers. |
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| 605. |
Bauxite is used as raw material by which industry? |
| A. | Aluminium |
| B. | Iron |
| C. | Steel |
| D. | Gold |
| Answer» A. Aluminium | |
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Explanation: Bauxite is the principal ore of aluminium. Bauxite is not a mineral. It is a rock formed from a laterite soil that has been severely leached of silica and other soluble materials in a wet tropical or subtropical climate. Aluminiumis extracted from bauxite using the Bayer process. |
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| 606. |
Which of the following is not a natural source of hydrocarbon? |
| A. | Natural Gas |
| B. | Coal |
| C. | Petroleum |
| D. | Mica |
| Answer» D. Mica | |
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Explanation: There are three main natural sources of hydrocarbons: natural gas, petroleum and coal. Mica is a natural occurring mineral that is based on a collection of silicate minerals and composed of varying amounts of potassium, iron, aluminum, magnesium and water. It is widely used in the electrical industry. |
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| 607. |
An acid having basicity one is - |
| A. | Sodium dihydrogen phosphate |
| B. | Disodium hydrogen phosphate |
| C. | Sodium phosphate |
| D. | Phosphoric acid |
| Answer» B. Disodium hydrogen phosphate | |
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Explanation: The basicity of an acid is the number of hydrogen ions (H+) which can be produced by the ionization of one molecule of the acid in aqueous solution. For ex-ample, the basicity of hydrochloric acid is 1 since one molecule of HCl produces one H+ ion in solution. Similarly, the basicity of Disodium phosphate (Na2HPO4) is one since it has one H+ displaceable ion. |
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| 608. |
Which one of the following vegetable oils is used in the manufacture of paints? |
| A. | Palm oil |
| B. | Sunflower oil |
| C. | Linseed oil |
| D. | Cottonseed oil |
| Answer» D. Cottonseed oil | |
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Explanation: Linseed oil and castor oils are used mainly as drying agents in paints and varnishes. Linseed oil is generally used in the manufacture of oil paints, drying oil finish orvarnish in wood finishing, as a pigment binder in oil paints, as a plasticizer and in the manufacture of linoleum. |
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| 609. |
Dry ice is the solid form of : |
| A. | Air 7 |
| B. | Carbon dioxide |
| C. | Nitrogen |
| D. | Water |
| Answer» B. Carbon dioxide | |
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Explanation: Dry ice, sometimes referred to as "cardice," is the solid form of carbon dioxide. It is used primarily as a cooling agent. Its advantages include lower tem-perature than that of water ice and not leaving any residue. It is useful for preserving frozen foods, ice cream, etc., where mechanical cooling is unavailable. |
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| 610. |
The common name of sodium bicarbonate is - |
| A. | Soda ash |
| B. | Baking soda |
| C. | Soda lime |
| D. | Baking powder |
| Answer» B. Baking soda | |
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Explanation: Sodium bicarbonate (NaHCO3) is also known as baking soda, bread soda, cooking soda, and bicarbonate of soda. It is primarily used in cooking (baking), as a leavening agent. It reacts with acidic, components in batters, releasing carbon dioxide, which causes expansion of the batter and forms the characteristic texture and grain in pancakes, cakes, quick breads, etc. |
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| 611. |
Which element behaves chemically both as metal and nonmetal? |
| A. | Argon |
| B. | Boron |
| C. | Xenon |
| D. | Carbon |
| Answer» B. Boron | |
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Explanation: Some elements behave chemically both as metals and nonmetals, and are called metalloids. Their examples include Boron, Silicon, Germanium and Antimony.Elements which are neither metals nor non- metals are called Noble Gases. |
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| 612. |
The amount of oxygen in the atmosphere remains relatively constant because it is given off by - |
| A. | Oceans |
| B. | Animals |
| C. | Rocks |
| D. | Plants |
| Answer» D. Plants | |
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Explanation: Just as water moves from the sky to the earth and back in the hydrologic cycle, oxygen is also cycled through the environment. Plants mark the beginning of the oxygen cycle. They use the energy of sunlight to convert carbon dioxide and water into carbohydrates and oxygen in a process called photosynthesis. |
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| 613. |
Which one of the following mineral does not contain oxygen? |
| A. | Haematite |
| B. | Bauxite |
| C. | Cryolite |
| D. | Calcite |
| Answer» C. Cryolite | |
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Explanation: Cryolite (Na3AlF6, sodium hexafluoroaluminate) does not contain oxygen. It occurs as glassy, colorless, white-reddish to gray-black prismatic monoclinic crystals. Cryolite is used as an insecticide and a pesticide. It is also used to give fireworks a yellow color. |
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| 614. |
Biogas majorly contains? |
| A. | Ethane |
| B. | Methane |
| C. | Hydrogen |
| D. | CO |
| Answer» B. Methane | |
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Explanation: Biogas is a mixture of different gases, major portion in biogas being methane (CH4) and carbon dioxide (CO2). It also contains traces of other gases like hydrogen (H2), Moisture (H2O), hydrogen sulphide (H2S) etc. |
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| 615. |
The scientific name for common salt is- |
| A. | Sodium hydroxide |
| B. | Sodium chloride |
| C. | Ammonium chloride |
| D. | Sodium hydrogencarbonate |
| Answer» B. Sodium chloride | |
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Explanation: Common salt is known as sodium chloride. It is an important raw material for various materials of daily use, such as sodium hydroxide, baking soda, washing soda etc. |
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| 616. |
Which of the following is a noble gas - |
| A. | Argon |
| B. | Hydrogen |
| C. | Oxygen |
| D. | Nitrogen |
| Answer» A. Argon | |
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Explanation: Noble gas, any of the seven chemical elements that make up Group 18 (VIIIa) of the periodic table. |
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| 617. |
Permanent - hardness of water may be removed by addition of – |
| A. | Alum |
| B. | Sodium carbonate |
| C. | Lime |
| D. | Potassium Permangante |
| Answer» B. Sodium carbonate | |
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Explanation: Sodium carbonate (also known as washing soda or soda ash) is a sodium salt of carbonic acid. In domestic use, it is used as a water softener in laundering. It competes with the magnesium and calcium ions in hard water and prevents them from bonding with the detergent being used. Sodium carbonate can be used to remove grease, oil and wine stains. |
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| 618. |
Which of the following is the best fuel in terms of energy released per gram of fuel? |
| A. | Hydrogen |
| B. | Methane |
| C. | Ethanol |
| D. | Butane |
| Answer» A. Hydrogen | |
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Explanation: The amount of energy released increases with the number of bonds present in the chemical substance or fuel. That is because each bond has a certain amount of energy stored in it therefore the more bonds the more energy is stored and more energy is released if these bonds break through combustion. Theoretical values of |
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| 619. |
One carat of diamond is equal to - |
| A. | 100mg |
| B. | 150mg |
| C. | 200mg |
| D. | 250mg |
| Answer» C. 200mg | |
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Explanation: One carat is equal to 200 milligrams, or in other words, a 5-carat stone weighs 1 gram. The weight of one carat is precisely 0.2 grams. |
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| 620. |
The manufacture of iron from iron ore involves the process of – |
| A. | oxidation |
| B. | reduction |
| C. | fractional distillation |
| D. | electrolysis |
| Answer» B. reduction | |
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Explanation: The manufacture of iron ore involves the process of reduction. Important ores of iron : Haematite, Magnetite. |
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| 621. |
Which of the following is caused by the higher concentration of Nitrogen and Phosphorous? |
| A. | Eutrophication |
| B. | Hardness |
| C. | Alkalinity |
| D. | Acidity |
| Answer» A. Eutrophication | |
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Explanation: Higher concentration of Nitrogen and Phosphorus causes Eutrophication. |
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| 622. |
The smallest particle of an element is called - |
| A. | Ion |
| B. | Electron |
| C. | Atom |
| D. | Molecule |
| Answer» C. Atom | |
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Explanation: An element is a substance completely made up of one atom. However, the atom itself is not the smallest known particle, but instead each atom is made up of three individual parts: electrons, protons and neutrons. |
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| 623. |
There are some substances whose odor changes in acidic or basic media. These are called - |
| A. | Olfactory indicators |
| B. | Litmus indicator |
| C. | Gustatory indicators |
| D. | All of the above |
| Answer» A. Olfactory indicators | |
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Explanation: An Olfactory indicator is a substance whose smell varies depending on whether it is mixed with an acidic or basic solution. Onion , clove oil and vanilla extract are examples. |
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| 624. |
Which of the following elements has the atomic number greater than that of Phosphorus? |
| A. | Aluminium |
| B. | Silicon |
| C. | Chlorine |
| D. | Magnesium |
| Answer» C. Chlorine | |
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Explanation: Chlorine is a chemical element with symbol Cl and atomic number 17. Phosphorus is a chemical element with symbol P and atomic number 15. |
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| 625. |
If the sewage is fully oxidized, the nitrogen is in the form of – |
| A. | Nitrites |
| B. | Ammonia |
| C. | Nitramines |
| D. | Nitrates |
| Answer» D. Nitrates | |
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Explanation: Oxidized forms of nitrogen include nitrite (NO2) and nitrate (NO3). Nitrogen mainly occurs in wastewater in this form. Because nitrite is easily oxidized to nitrate, nitrate is the compound predominantly found in groundwater and surface waters. |
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| 626. |
Which among the following is used to dilute oxygen in the gas cylinders used by divers? |
| A. | Krypton |
| B. | Argon |
| C. | Helium |
| D. | Neon |
| Answer» C. Helium | |
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Explanation: Helium is used to dilute the oxygen and nitrogen to reduce these affects. Helium is the gas of choice to use because it is an inert gas, is thinner, therefore more compressible than air, and its narcotic properties are negligible in comparison to nitrogen. |
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| 627. |
Which one of the following does not form oxyacid? |
| A. | Sulphur |
| B. | Chlorine |
| C. | Nitrogen |
| D. | Fluorine |
| Answer» D. Fluorine | |
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Explanation: Fluorine cannot form oxyacid because fluorine is more electronegative than oxygen. For oxygen to bind, it must be a positively charged ion. |
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| 628. |
The gas used to extinguish fire is – |
| A. | Neon |
| B. | Nitrogen |
| C. | Carbon dioxide |
| D. | Carbon monoxide |
| Answer» C. Carbon dioxide | |
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Explanation: Fires require these 3 things: a fuel (a hydrocarbon, which is a compound containing only carbon and hydrogen), a source of oxygen, and heal. Carbon Dioxide is most commonly used to extinguish fire as it displaces wwgen, thus choking the very source of a fire. |
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| 629. |
is not an allotrope of carbon. |
| A. | Buckminsterfullerene |
| B. | Carbon Doxide |
| C. | Diamond |
| D. | Graphite |
| Answer» B. Carbon Doxide | |
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Explanation: Carbon is capable of forming many allotropes due to its valency. Well-known forms of carbon include diamond and graphite. Other allotropes in clude: include buckyballs (fullerenes), amorphous carbon, glassy carbon, carbon nanofoam, nanotubes,and others. |
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| 630. |
Which hydrocarbons are the major constituents of 'LPG'? |
| A. | Methane and Ethane |
| B. | Propane and Butane |
| C. | Pentane and Benzene |
| D. | Only Methane |
| Answer» B. Propane and Butane | |
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Explanation: Cooking gas, also known as Liquefied Petroleum Gas (LPG) is primarily propane (C3Hg) and butane (C4H10). |
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| 631. |
When cathode rays strike a target of high atomic weight, they give rise to – |
| A. | α -rays |
| B. | β and γ rays |
| C. | X-rays |
| D. | positive rays |
| Answer» C. X-rays | |
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Explanation: When cathode rays strike a solid target of high atomic weight and high melting point such as tungsten, molybdenum, etc, they give rise to a highly pen-etrating radiation called the X-rays (LIT Physics by Dr. P.K Aganval). |
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| 632. |
The major use of sulphur is in the manufacture of – |
| A. | H2SO4 |
| B. | H2S |
| C. | SO2 |
| D. | Fungicide |
| Answer» A. H2SO4 | |
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Explanation: The major use of sulphur is in the manufacture of sulphuric acid (H2SO4) which is one of the most important compounds made by the chemical industry. It is used to make,literally, hundreds of compounds needed by almost every industry. |
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| 633. |
Which of the following will replace hydrogen from acids to form salts? |
| A. | S |
| B. | Na |
| C. | Ag |
| D. | P |
| Answer» B. Na | |
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Explanation: All acids contain hydrogen atom (s). Dilute acids react with some metals such as Sodium, Potassium, Calcium, iron, etc to form salts. Sodium replaces two hydrogen atoms from Sulfuric acid (H2SO4) to form a normal salt, Sodium Sulphate (Na2SO4). |
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| 634. |
Which of the following metals has least, melting point? |
| A. | Gold |
| B. | Silver |
| C. | Mercury |
| D. | Copper |
| Answer» C. Mercury | |
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Explanation: The melting point of the given metals (in Celsius) are:- Gold: 1063; Silver: 961; Copper: 1083; Mercury: 38.86. Mercury is the only elemental metal known to melt at a generally cold temperature. |
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| 635. |
Water gas is the combination of – |
| A. | CO and H2 |
| B. | CO2 and H2 |
| C. | CO and H2O |
| D. | CO2 and CO |
| Answer» A. CO and H2 | |
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Explanation: Water has is a synthesis gas, containing carbon monoxide (CO) and hydrogen has (H2). It is made by passing steam over a red- hot carbon fuel such as coke. The reaction between steam and hydrocarbons produce the has mixture.Q.21) Which of the following elements is |
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| 636. |
which is stable com- pound. This causes oxygen starvation in the body tissues and eventually causes death by suffocation.ammonium phosphate. |
| A. | N4H6PO4 |
| B. | (NH4)3PO |
| C. | (NH4)3PO4 |
| D. | (NH4)2PO4 |
| Answer» C. (NH4)3PO4 | |
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Explanation: (NH4)3PO4 is a the chemical formula for ammonium phosphate. For more chemistry related queries log on to website world of chemicals. |
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| 637. |
If there is one million Mg2+ ions in MgCl2, how many chloride ions are there? |
| A. | Two million |
| B. | One million |
| C. | Half a million |
| D. | Ten million |
| Answer» A. Two million | |
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Explanation: 0 |
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| 638. |
The gas that causes suffocation and death when coal or coke is burnt in a closed room is - |
| A. | Methane |
| B. | Ethane |
| C. | Carbon monoxide |
| D. | Carbon dioxide |
| Answer» C. Carbon monoxide | |
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Explanation: Exhaust fumes of motor cars, gases produced, from coal fire in a closed room and coal gas, all contain carbon monoxide, which is the cause of their poisonous nature. When carbon monoxide is inhaled, it prevents the oxygen from combining with hemoglobin and instead combines itself with hemoglobin to form carboxyhaemoglobin, |
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| 639. |
Teryleneisa condensation polymer of ethylene glycol and which acid? |
| A. | Benzoic Acid |
| B. | Salicylic acid |
| C. | Phthalic acid |
| D. | Terephthalic acid |
| Answer» D. Terephthalic acid | |
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Explanation: Terylene is a co-polymer of ethylene glycol and Terephthalic acid. Also known as Dacron, it is prepared by the condensation polymerization of ethylene glycerol and. Terephthalic acid with elimination of water. The reaction is carried out at about 420- 460 K in the presence of a catalyst consisting of a mixture of zinc acetate and antimony trioxide. |
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| 640. |
Which of the following ores does not contain iron? |
| A. | Haematite |
| B. | Magnetite |
| C. | Limonite |
| D. | Cassiterite |
| Answer» D. Cassiterite | |
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Explanation: 0 |
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| 641. |
Acids generate: |
| A. | Acids generate hydrogen ions. |
| B. | Bases generate hydroxide ions. |
| C. | Both are correct |
| D. | Both are incorrect |
| Answer» C. Both are correct | |
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Explanation: Acids, in presence of water, give hydrogen ions (H+). Similarly, bases generate hydroxide (OH-) ions in water. |
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| 642. |
Which one of the following is not a characteristic feature of alloys? They are – |
| A. | Compounds |
| B. | Mixtures |
| C. | Solutions |
| D. | Homogeneous systems |
| Answer» D. Homogeneous systems | |
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Explanation: An alloy is a mixture or metallic solid solution composed of two or more elements. So they are heterogeneous systems. Complete solid solution alloys give single solid phase microstructure, while partial solutions give two or more phases that may or may not be homogeneous in distribution, depending on thermal (heat treatment) history. Alloys usually have different properties from those of the component elements. |
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| 643. |
When iron rusts, its weight – |
| A. | decreases |
| B. | increases |
| C. | remains the same |
| D. | first increases and then decreases |
| Answer» B. increases | |
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Explanation: When iron rusts, oxide compounds are formed due the interaction between oxygen in the air or in water and the metal. Because of the oxygen atoms binding with the metal, the weight of the metal with rust will increase. |
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| 644. |
Nylon threads are made of - |
| A. | Polyester polymer |
| B. | Polyamide polymer |
| C. | Polyvinyl polymer |
| D. | Polysaccharide |
| Answer» B. Polyamide polymer | |
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Explanation: Nylon is a generic designation for |
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| 645. |
The manufacturing of iron from ironore involves the process of - |
| A. | Oxidation |
| B. | Reduction |
| C. | Electrolysis |
| D. | Fractional distillation |
| Answer» B. Reduction | |
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Explanation: Iron is extracted from iron ore in a huge container called a blast furnace. Iron ores such as hematite contain iron oxide. The oxygen must be removed from the iron oxide to leave the iron behind. Reactions in which oxygen is removed are called reduction reactions. |
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| 646. |
Which one of the following elements is metalloid? |
| A. | Si |
| B. | Pb |
| C. | Ge |
| D. | C |
| Answer» C. Ge | |
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Explanation: A metalloid is a chemical element with properties in between metals and nonmetals. Germanium (Ge) is a chemical element. It is a lustrous, hard, grayish-white metalloid in the carbon group. |
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| 647. |
Cobalt (60) isotope is used in the treatment of which disease? |
| A. | Heart diseases |
| B. | cancer |
| C. | diabetes |
| D. | skin diseases |
| Answer» B. cancer | |
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Explanation: In cobalt-60 therapy, cobalt-60- generated gamma radiation is used to destroy tumors. Cobalt-60 therapy is also known as Gamma Knife® therapy. |
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| 648. |
Which one of the following is used in the preparation of antiseptic solution? |
| A. | Potassium nitrate |
| B. | Iodine |
| C. | Iodine chloride |
| D. | Potassium chloride |
| Answer» B. Iodine | |
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Explanation: Antiseptics are chemical agents that slow or stop the growth of micro-organisms (germs) on external surfaces of the body and help prevent infections. |
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| 649. |
The characteristic odour of garlic is due to - |
| A. | a chloro compound |
| B. | a sulphur compound |
| C. | a fluorine compound |
| D. | acetic acid |
| Answer» B. a sulphur compound | |
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Explanation: The sulfur compounds in onions and garlic are called sulfites. These highly irritating chemicals can kill microbes and repel insects; prolonged contact with garlic will even blister the skin. |
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| 650. |
An emulsion is a colloidal solution of - |
| A. | Liquid in liquid |
| B. | Solid in liquid |
| C. | Gas in solid |
| D. | Solid in Solid |
| Answer» A. Liquid in liquid | |
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Explanation: An emulsion is a mixture of two or more liquids that are normally immiscible (unmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. Examples of emulsions include vinaigrettes, homogenized milk, mayonnaise, and some cutting fluids for metal working. |
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