McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 1051. |
Which type of fire extinguisher is used for petroleum fire? |
| A. | Foam type |
| B. | Soda acid type |
| C. | Powder type |
| D. | None of these |
| Answer» A. Foam type | |
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Explanation: Foam type fire extinguishers are suitable for fires that involve flammable or combustible liquids, including petrol, grease, and oil. They are applied to fuel fires as either an aspirated (mixed & expanded with air in a branch pipe) or nonaspirated form to form a frothy blanket or seal over the fuel, preventing oxygen reaching it. Powder types are useful for combustible metals. |
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| 1052. |
The function of skimming tank in sewage treatment is to remove – |
| A. | oil and fatty substances |
| B. | suspended solids |
| C. | gritty substances |
| D. | inorganic substances |
| Answer» A. oil and fatty substances | |
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Explanation: Oil and grease traps are small size skimming basins provided to remove oil and grease and other small floating materials such as fats, vegetable debris, fruit skins, etc. It is so designed that lighter materials like grease and oil content of wastewater rise to the surface of wastewater and remains on top of liquid until removed. |
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| 1053. |
Who discovered Oxygen? |
| A. | Carl Scheele |
| B. | Hooke |
| C. | Heisenberg |
| D. | Williams |
| Answer» A. Carl Scheele | |
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Explanation: Oxygen was discovered for the first time by a Swedish Chemist, Carl Wilhelm Scheele in 1772.He called the gas "fire air". |
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| 1054. |
Which one among the following is used as a moderator in nuclear reactors? |
| A. | Ozone |
| B. | Heavy hydrogen |
| C. | Hydrogen peroxide |
| D. | Heavy water |
| Answer» D. Heavy water | |
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Explanation: A pressurized heavy-water reactor (PHWR) is a nuclear reactor, commonly using natural uranium as its fuel, that uses heavy water (deuterium oxide D2O) as its coolant and neutron moderator. |
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| 1055. |
Which one of the following is used as preservative for foodstuff? |
| A. | Sodium Benzoate |
| B. | Picric acid |
| C. | Glycerine |
| D. | Sodium Chloride |
| Answer» A. Sodium Benzoate | |
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Explanation: Sodium benzoate is a preservative. It is bacteriostatic and fungistatic under acidic conditions. It is most widely used in acidic foods such as salad dressings (vinegar), carbonated drinks (carbonic acid), jams and fruit juices (citric acid), pickles (vinegar), and condiments. It is also used as a preservative in medicines and cosmetics. |
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| 1056. |
The element with highest first ionization energy is - |
| A. | hydrogen |
| B. | helium |
| C. | lithium |
| D. | sodium |
| Answer» B. helium | |
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Explanation: The first ionisation energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+. The first first ionisation energy (in KJ per mole) of Hydrogen: around 1200:Helium: about 2500; Lithium: about 500; and Sodium: about 500. |
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| 1057. |
The chief source of naphthalene is – |
| A. | Coal-tear |
| B. | Diesel |
| C. | Charcoal |
| D. | Camphor |
| Answer» A. Coal-tear | |
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Explanation: Coal tar is a brown or black liquid of extremely high viscosity. In the coal gas era, there were many companies in Britain whose business was to distill coal tar to separate the higher-value fractions, such as naphtha, creosote and pitch. Naphthalene is derived from a kind of naphtha (a broad term encompassing any volatile, flammable liquid hydrocarbon mixture, including coal tar). |
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| 1058. |
KMnO4 can be used as a/an - |
| A. | insecticide |
| B. | fertiliser |
| C. | pesticide |
| D. | disinfectant |
| Answer» D. disinfectant | |
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Explanation: Potassium permanganate is an inorganic chemical compound with the formula KMnO4. As an oxidant, potassium permanganate can act as an antiseptic. For example, dilute solutions are used to treat canker sores (ulcers), disinfectant for the hands and treatment for mild pompholyx, dermatitis, and fungal infections of the hands or feet. It is used extensively in the water treatment industry. |
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| 1059. |
Seaweeds are important source of – |
| A. | fluorine |
| B. | chlorine |
| C. | bromine |
| D. | iodine |
| Answer» D. iodine | |
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Explanation: Seaweed is a source of iodine, necessary for thyroid function and to prevent goitre. However, an excess of iodine is suspected in the heightened cancer risk in Japanese who consume a lot of the plant. |
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| 1060. |
The resources which can be used continuously, year-after-year are called – |
| A. | Biotic |
| B. | Abiotic |
| C. | Non-renewable |
| D. | Renewable |
| Answer» D. Renewable | |
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Explanation: A renewable resource is a natural resource with the ability to reproduce through biological or natural processes and replenished with the passage of time. Renewable resources are part of our natural environment and form our eco-system. |
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| 1061. |
Match sticks are made of - |
| A. | Red phosphorus |
| B. | blue phosphorus |
| C. | led nitrate |
| D. | None |
| Answer» A. Red phosphorus | |
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Explanation: Red phosphorus is used in matches. Ferrophosphorus, a combination of phosphorus with iron, is used as an ingredient in high-strength low-alloy steel. |
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| 1062. |
Newlands' table, the elements were placed with the halogens - |
| A. | Mn and As |
| B. | Fe and Se |
| C. | Ce and La |
| D. | Co and Ni |
| Answer» D. Co and Ni | |
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Explanation: Newlands' Law of Octaves suffered from lot of limitations, In order to fit elements into his table, Newlands ad justed two elements in the same slot, but also put some unlike elements under the same note. |
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| 1063. |
Iron rusts quickly in – |
| A. | Rain water |
| B. | Sea water |
| C. | Distilled water |
| D. | River water |
| Answer» B. Sea water | |
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Explanation: Water is the enabler of fast oxidation of iron. So freshwater will also cause rust. However, salt water (sea water) is a very good conductor (lots of dissociated ions) and so there are a number of electrolysis reactions that tremendously accelerate corrosion in salt water. This effect can be reversed by using a metal (like zinc) which causes the current to be re-versed and in effect the zinc corrodes rapidly, protecting the iron. |
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| 1064. |
Aerated water contains – |
| A. | SO2 |
| B. | NO2 |
| C. | NO2 |
| D. | CO2 |
| Answer» D. CO2 | |
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Explanation: Aerated water is, correctly speaking, water to which air is added. So aerated water is any water artificially impregnated with a large amount of has (as carbon dioxide). The term is, however, frequently applied to carbonated water. |
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| 1065. |
In electro-refining, the pure metal is deposited on – |
| A. | vessel |
| B. | electrolyte |
| C. | cathode |
| D. | anode |
| Answer» C. cathode | |
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Explanation: In electro-refining, the anodes consist of unrefined impure metal, and as the current passes through the acidic electrolyte the anodes are corroded into the solution so that the electroplating process deposits refined pure metal onto the cathodes. Electrolytic refining is used to extract impurities from crude metals. |
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| 1066. |
Natural rubber is a polymer of – |
| A. | Vinyl acetate |
| B. | Propene |
| C. | Isoprene |
| D. | Styrene |
| Answer» C. Isoprene | |
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Explanation: Natural rubber consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Isoprene is produced and emitted by many species of trees into the atmosphere (major producers are oaks, poplars, eucalyptus, and some legumes). |
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| 1067. |
Which among the following is used as a catalyst in the production of high octane fuels? |
| A. | HNO3 |
| B. | H2SO4 |
| C. | HCl |
| D. | HF |
| Answer» B. H2SO4 | |
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Explanation: Sulfuric acid is used as a catalyst for refining and for producing alkylate, an essential component of highoctane fuel. The hydrocarbon molecules are reformed into more complex molecules with a higher octane rating value. |
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| 1068. |
Th effect or response produced by two or more chemicals are less than the sum of the effects or response that the chemical would produce individually is known as - |
| A. | Antagonism |
| B. | Independent |
| C. | Additive |
| D. | Synergism |
| Answer» A. Antagonism | |
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Explanation: Synergy is the interaction of multiple elements in a system to produce an effect different from or greater than the sum of their individual effects. On the other hand, antagonism is the combined action of two or more substances to produce an effect less than the sum of their individual effects. |
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| 1069. |
Which metal is the heaviest in periodic table among the following? |
| A. | Os |
| B. | Pt |
| C. | Pb |
| D. | W |
| Answer» A. Os | |
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Explanation: The densest chemical element is Osmium (which is a metal). Osmium has a density of around 22 grams per cubic centimeter, about twice the density of lead. |
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| 1070. |
The chemical formula of the laughing gas is – |
| A. | NO |
| B. | N2O |
| C. | NO2 |
| D. | N2O3 |
| Answer» B. N2O | |
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Explanation: Nitrous oxide, commonly known as laughing gas, is a chemical compound with the formula N2O. It is an oxide of nitrogen. |
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| 1071. |
Radioactive elements emit – |
| A. | Radiowaves |
| B. | Infrared waves |
| C. | Ultraviolet waves |
| D. | α, β and γ radiations |
| Answer» D. α, β and γ radiations | |
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Explanation: The phenomenon of spontaneous emission of certain kinds of radiations by some elements is called radioactivity and the elements emitting such radiations are called radioactive elements. The nature of the radiations emitted from a radioactive substance was investigated by Rutherford in 1904 by applying electric and magnetic fields to the radiations. It is observed that on applying the field, the rays emitted from the radioactive substances are separated in to three types, called a, b and g rays. |
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| 1072. |
Which one out of the following helps in burning? |
| A. | Oxygen |
| B. | Carbon monoxide |
| C. | Nitrogen |
| D. | Carbon dioxide |
| Answer» A. Oxygen | |
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Explanation: Karl Scheele, the Swedish chemist, was the first to prepare oxygen by heating mercuric oxide in 1772. Joseph Priestley, the English chemist, also prepared oxygen in 1774 by focusing the sun's rays with the help of a lens on mercuric oxide. Its elemental nature was, however, established by the French chemist, Lavoisier. |
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| 1073. |
Which one of the following is a mixture of carbon monoxide and hydrogen? |
| A. | coal gas |
| B. | producer gas |
| C. | water gas |
| D. | gobar gas |
| Answer» C. water gas | |
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Explanation: Water gas is a mixture of carbon monoxide and hydrogen produced from synthesis gas. It is a poisonous, colorless gas and burns with an almost colorless flame (light blue). |
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| 1074. |
Which of the following elements has the lowest melting point? |
| A. | Bromine |
| B. | Zinc |
| C. | Calcium |
| D. | Lead |
| Answer» A. Bromine | |
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Explanation: Bromine is a chemical element with symbol Br and atomic number 35. Thus, the melting and boiling points of bromine are intermediate between those of chlorine and iodine. |
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| 1075. |
The chemical substance present in bones and teeth is - |
| A. | Calcium phosphate |
| B. | Calcium chloride |
| C. | Calcium sulphate |
| D. | Calcium borate |
| Answer» A. Calcium phosphate | |
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Explanation: Seventy percent of bone consists of hydroxyapatite, a calcium phosphate mineral (known as bone mineral). Tooth enamel is composed of almost ninety percent hydroxylapatite. |
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| 1076. |
The percentage of carbon in cost iron is |
| A. | 0.01 to 0.25 |
| B. | 0.5 to 1.5 |
| C. | 6 to 3 |
| D. | 3 to 5 |
| Answer» D. 3 to 5 | |
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Explanation: Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape. It contains 2 to 4.5 percent carbon, 0.5 to 3 percent silicon, and lesser amounts of sulfur, manganese, and phosphorus. |
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| 1077. |
The compound that has the least value for octane number is – |
| A. | 2-methyl heptane |
| B. | Iso-octane |
| C. | 2,2-dimethyl hexane |
| D. | n-heptane |
| Answer» D. n-heptane | |
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Explanation: Octane rating or octane number is a standard measure of the performance of a motor or aviation fuel. The higher the octane number, the more compression the fuel can withstand. Isooctane (upper) has an octane ratingof 100 whereas n-heptane has an octane rating of O. |
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| 1078. |
Which of the following is a correct pair according to increasing atomic number from left to right? |
| A. | Ca, Cl |
| B. | Be, B |
| C. | Na, Ne |
| D. | He, H |
| Answer» B. Be, B | |
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Explanation: The correct pair is Be and B. Beryllium (Be) has atomic number of 4, while the atomic number of Boron (2) is 5. |
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| 1079. |
The gas causing acid rain in an industrial area is - |
| A. | Carbon dioxide |
| B. | Carbon monoxide |
| C. | Sulphur dioxide |
| D. | Methane |
| Answer» C. Sulphur dioxide | |
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Explanation: The main gases responsible for causing acid rain are sulphur dioxide as well as nitrous oxides. The main sources of sulphur dioxide are metal working industries and coal- fired power stations whereas nitrous oxide is from vehicles and fuel combustion. |
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| 1080. |
Which one of the following has greatest mass? |
| A. | electron |
| B. | proton |
| C. | neutron |
| D. | hydrogen nucleus |
| Answer» C. neutron | |
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Explanation: 0 |
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| 1081. |
A colloidal system in which a liquid is dispersed in a liquid is called – |
| A. | gel |
| B. | emulsion |
| C. | sol |
| D. | precipitate |
| Answer» B. emulsion | |
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Explanation: An emulsion is a mixture of two or more liquids that are normally immiscible (nonmixable or unblendable). Emulsions are part of a more general class of two-phase systems of matter called colloids. In an emulsion, one liquid (the dispersed phase) is dispersed in the other (the continuous phase). Examples of emulsions include vinaigrettes, milk, mayonnaise, and some cutting fluids for metal working. |
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| 1082. |
When a lead storage battery is discharged - |
| A. | SO2 is evolved |
| B. | Lead sulphate is consumed |
| C. | Lead is formed |
| D. | Sulphuric acid is consumed |
| Answer» D. Sulphuric acid is consumed | |
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Explanation: Lead storage battery was invented by French physicist Gaston Plante in 1859. In the discharged state both the positive and negative plates become lead sulphate and the electrolyte loses much of its dissolved sulphuric acid and becomes primarily water. |
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| 1083. |
Chemically fats and oils are: |
| A. | Triesters |
| B. | Amines |
| C. | Aldehydes |
| D. | Ketons |
| Answer» A. Triesters | |
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Explanation: Fats and oils are called triglycerides (or triacylcylgerols) because they are esters composed of three fatty acid units joined to glycerol, a trihydroxy alcohol. Fats and oils are composed of molecules known as triglycerides, which are esters. |
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| 1084. |
Atomic number of which of the following elements is greater than that of Fluorine? |
| A. | Sodium |
| B. | Beryllium |
| C. | Nitrogen |
| D. | Boron |
| Answer» A. Sodium | |
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Explanation: Sodium has higher atomic number (11) than Fluorine (9) The atomic number of Beryllium and Nitrogen are 4 and 7 respectively. |
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| 1085. |
Which of the following is a Synthetic rubber? |
| A. | Leoprene |
| B. | Monoprene |
| C. | Neoprene |
| D. | Isoprene |
| Answer» C. Neoprene | |
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Explanation: Neoprene Rubber, also known as polychloroprene or PC Rubber, is an extremely versatile synthetic rubber offering oil, petroleum and weathering resistance. |
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| 1086. |
Washing soda is the common name of- |
| A. | Calcium Carbonate |
| B. | Calcium Bi-Carbonate |
| C. | Sodium Carbonate |
| D. | Sodium Bi-Carbonate |
| Answer» C. Sodium Carbonate | |
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Explanation: Washing soda, sodium carbonate decahydrate, efflorescent crystals used for washing, especially textiles. It is a compound of sodium (q.v.). |
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| 1087. |
Which one of the following is known as the 'brown coal'? |
| A. | Anthracite |
| B. | Bituminous |
| C. | Coke |
| D. | Lignite |
| Answer» D. Lignite | |
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Explanation: Lignite, often referred to as brown coal, is a soft brown fuel with characteristics that put it somewhere between coal and peat. It is considered the lowest rank of coal. It has a carbon content of around 2535%, a high inherent moisture content sometimes as high as 66%, andan ash content ranging from 6% to 19% compared with 6% to 12% for bituminous coal. |
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| 1088. |
Maximum permissible concentration of copper in drinking water in mg/L, is – |
| A. | 0.01 |
| B. | 0.05 |
| C. | 1.0 |
| D. | 2.0 |
| Answer» C. 1.0 | |
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Explanation: The 1959 WHO International Standards for Drinking Water suggested that concentrations of copper greater than 1.5 mg/litre would markedly impair the potability of the water. However, in the first edition of the Guidelines for Drinking Water Quality, published in 1984, a guideline value of 1.0 mg/litre was established for copper, based on its laundry and other staining properties. |
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| 1089. |
Oxygen has (+) oxidation number only in – |
| A. | OF2 |
| B. | Cl2O |
| C. | H2O |
| D. | N2O |
| Answer» A. OF2 | |
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Explanation: In case of F2O, oxygen is not the most electronegative element. The fluorine is more electronegative and has an oxidation state of -1. In this case, the oxygen has an oxidation state of +2. |
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| 1090. |
Which one of the following elements is used in the manufacture of fertilizers? |
| A. | Fluorine |
| B. | Potassium |
| C. | Lead |
| D. | Aluminium |
| Answer» B. Potassium | |
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Explanation: Nitrogen, phosphorus and potassium are the three most common bases of fertilizers. Potash can be used to make potassium (K) fertilizers. All commercial potash depositscome originally from marine deposits and are often buried deep in the earth. |
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| 1091. |
Select the one which is not a mixture – |
| A. | Air |
| B. | Gasoline |
| C. | LPG |
| D. | Distilled water |
| Answer» D. Distilled water | |
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Explanation: Water (H2O) is the most abundant compound on Earth's surface. Water is a compound because it contains oxygen and hydrogen which are chemically combined in proportion. |
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| 1092. |
When Hydrogen starts burning in air, it produces? |
| A. | Ammonia |
| B. | Water |
| C. | Methane |
| D. | Carbonic Acid |
| Answer» B. Water | |
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Explanation: Hydrogen burns in oxygen or air to form water. 2H2 + O2 = 2H2O |
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| 1093. |
Carbon occurs in nature in the purest form as - |
| A. | Diamond |
| B. | Graphite |
| C. | Carbon black |
| D. | Coal |
| Answer» A. Diamond | |
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Explanation: There are three forms of pure carbon: Graphite, Coal and Diamond. All three are made up of elemental carbon, caol is the least pure when found in nature. Diamond is the purest form of Carbon. |
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| 1094. |
In an oxygen molecule, two atoms are united by - |
| A. | one bond |
| B. | two bonds |
| C. | three bonds |
| D. | four bonds |
| Answer» B. two bonds | |
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Explanation: Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons. |
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| 1095. |
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is – |
| A. | Neon |
| B. | Krypton |
| C. | Argon |
| D. | Helium |
| Answer» D. Helium | |
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Explanation: Helium is used by deep sea divers because it reduces the narcosis of nitrogen and it remains below the oxygen toxicity limits. In fact, they use tri mix of Oxygen, helium and a little bit of nitrogen. |
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| 1096. |
Rectified spirit is : |
| A. | 95% ethyl alcohol |
| B. | 100% ethyl alcohol |
| C. | methylated spirit |
| D. | tincture iodine |
| Answer» A. 95% ethyl alcohol | |
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Explanation: Rectified spirit, also known as ethyl alcohol of agricultural origin, is highly concentrated ethanol which has been purified by means of repeated distillation, called rectification. It typically contains 95% alcohol by volume. |
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| 1097. |
Nylon is made up of : |
| A. | Polyamide |
| B. | Polyester |
| C. | Polyethylene |
| D. | Polypropylene |
| Answer» A. Polyamide | |
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Explanation: Nylon is a generic designation for a family of synthetic polymers knowngenerically as aliphatic polyamides. It is one of the most commonly used polymers. |
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| 1098. |
Which is a natural colloid? |
| A. | Sodium chloride |
| B. | Urea |
| C. | Cane-sugar |
| D. | Blood |
| Answer» D. Blood | |
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Explanation: Examples of natural colloids can be found in our body itself: blood consists of colloidal sized red blood corpuscles (RBC) which provide the vital oxygen to all the body tissues. |
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| 1099. |
Which one of the following does not contain Silver? |
| A. | Ruby Silver |
| B. | Lunar Caustic |
| C. | German Silver |
| D. | Horn Silver |
| Answer» C. German Silver | |
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Explanation: Nickel silver, also known as German silver, is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. Nickel silver is named for its silvery appearance, but it contains no elemental silver unless plated. |
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| 1100. |
Which of the following auto mobile gases is not considered to be an air pollutant? |
| A. | Carbon dioxide |
| B. | Carbon monoxide |
| C. | Sulfur dioxide |
| D. | Nitrogen dioxide |
| Answer» A. Carbon dioxide | |
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Explanation: There are mainly six air pollutants: carbon monoxide lead, ground-level ozone, nitrogen dioxide, particulate matter, and sulfur dioxide. |
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