McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 551. |
Which of the following acts as best adsorbent? |
| A. | Charcoal |
| B. | Activated Charcoal |
| C. | Activated Coconut Charcoal |
| D. | Carbon black |
| Answer» C. Activated Coconut Charcoal | |
|
Explanation: Activated coconut charcoal is a highly absorbent material with millions of tiny pores that can capture, bind, and remove unwanted materials. The porous surface has a negative electric charge that attracts positively charged toxins and gas to be carried easily out of the body. It is used medicinally as well as in air and water purifiers. |
|
| 552. |
Which of the following is used as no coating for Cooking utensils? |
| A. | Perspex |
| B. | Styrofoam |
| C. | Polystyrene |
| D. | (4)Teflon |
| Answer» D. (4)Teflon | |
|
Explanation: The non-stick coating used mainly for coating cooking utensils is made using PTFE (polytetrafluoroethylene) that is also known by the name Teflon. Teflon is an inert polymer with high thermal and chemical resistance. Besides, it is hydrophobic: neitherwater nor water-containing substances wet it and it has one of the lowest coefficients of friction of any solid. |
|
| 553. |
The least preferred technique in the disposal of Municipal Solid Waste is - |
| A. | Incineration |
| B. | Composting |
| C. | Land filling |
| D. | Bricketting |
| Answer» D. Bricketting | |
|
Explanation: Some of the methods of solid waste disposal and management are : Open burning Dumping into the sea Sanitary Landfills Incineration Composting Ploughing in fields Hog feeding Grinding and discharging into sewers Salvaging Fermentation and biological digestion Bricketting that involves the solidification of preprocessed municipal solid waste into fuel pellets or briquettes is the least preferred method of solid waste disposal. |
|
| 554. |
Which is the heaviest metal among the following? |
| A. | Gold |
| B. | Silver |
| C. | Iron |
| D. | Copper |
| Answer» A. Gold | |
|
Explanation: The heaviness of any metal is defined with reference to high densities, atomic weights, or atomic numbers. The atomic masses of the given elements are: Gold: 196.96654; Silver: 107.8682; Copper: 63.546; Iron: 55.847. So the heaviest metal is gold, followed by silver, copper and iron. |
|
| 555. |
Which of the following is a commercial source of energy? |
| A. | Agricultural waste |
| B. | Dried dung |
| C. | Sun |
| D. | Natural gas |
| Answer» D. Natural gas | |
|
Explanation: Energy is broadly classified as commercial and non-commercial energy. Firewood, agricultural waste (straw, etc.) and animals waste (cowdung) are the important components of non-commercial energy. Coal, petroleum products, natural gas and, electricity are the important components of commercial energy. These goods are largely used for commercial purposes in the factories and farms. |
|
| 556. |
Which of the following is used to make light weight, but strong plastic? |
| A. | Nylon |
| B. | Polythene |
| C. | Polyvinyl Chloride |
| D. | Methyl Methacrylate |
| Answer» C. Polyvinyl Chloride | |
|
Explanation: Polyvinyl chloride (PVC) is a common, strong but lightweight plastic that is used in making tough plastic. It is used for flexible applications such as insulating cables. It is the third-most widely produced synthetic plastic polymer, after polyethylene and polypropylene. |
|
| 557. |
Which gas emitted by power stations causes acid rain? |
| A. | Carbon dioxide |
| B. | Sulphur dioxide |
| C. | Helium |
| D. | Nitrogen |
| Answer» B. Sulphur dioxide | |
|
Explanation: Sulfur dioxide (SO2) and nitrogen oxides (NOx) are the principal pollutants that cause acid rain. SO2 and NOx emissions released to the air react with water vapor and other chemicals to form acids that fall back to Earth. Power plants burning coal and heavy oilproduce over two-thirds of the annual SO2 emission. |
|
| 558. |
Heavy water is – |
| A. | Deuterium |
| B. | Rain water |
| C. | Tritium oxide |
| D. | Deuterium oxide |
| Answer» D. Deuterium oxide | |
|
Explanation: Heavy water is deuterium oxide (2H2O). It is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in normal water. |
|
| 559. |
Chemical composition of heavy water is – |
| A. | H2O2 |
| B. | H2O |
| C. | HDO |
| D. | D2O |
| Answer» D. D2O | |
|
Explanation: The chemical composition of Heavy water (deuterium oxide) is 2H2O or D2O. |
|
| 560. |
The most abundant element is - |
| A. | Calcium |
| B. | Silicon |
| C. | Oxygen |
| D. | Nitrogen |
| Answer» C. Oxygen | |
|
Explanation: On earth, oxygen is the most common element, making up about 47% of the earth's mass. Silicon is second, making up 28%, followed by aluminum (8%), iron (5%), magnesium (2%), calcium (4%), sodium (3%), and potassium (3%). All of the remaining elements together make up less than 1% of the earth's mass. |
|
| 561. |
Aluminium salt commonly used to stop bleeding is - |
| A. | Aluminium nitrate |
| B. | Aluminium sulphate |
| C. | Aluminium Chloride |
| D. | Potash alum |
| Answer» B. Aluminium sulphate | |
|
Explanation: Alum (Aluminium Sulfate) is used to stop bleeding. For example, Styptic pencils containing aluminium sulfate are used as astringents to prevent bleeding from small shaving cuts. It constricts blood vessels to stop the flow of blood. |
|
| 562. |
Hydrochloric acid is also known as - |
| A. | Galic acid |
| B. | Picric acid |
| C. | Muriatic acid |
| D. | Chloric acid |
| Answer» C. Muriatic acid | |
|
Explanation: Hydrochloric acid was historically called acidum sails, muriatic acid, and spirits of salt because it was produced from rock salt and green vitriol and later from the chemically similar substances common salt and sulfuric acid. Hydrochloric acid is found naturally in gastric acid. |
|
| 563. |
The inert gas used as beacon light is - |
| A. | Kr |
| B. | Ar |
| C. | He |
| D. | Ne |
| Answer» D. Ne | |
|
Explanation: Neon is used in neon discharge lamps and advertising signs because the neon lights are visible from long distances. Since the light of neon signs has a better penetrating power through fog and mist, the neon signs are also used in beacon lights for the safety of air and sea navigation. |
|
| 564. |
Who proposed first atomic theory? |
| A. | E.Rutherford |
| B. | De Broglie |
| C. | John Dalton |
| D. | D.I.Mendeleef |
| Answer» C. John Dalton | |
|
Explanation: Democritus first suggested the existence of the atom but it took almost two millennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844). |
|
| 565. |
The ultrapure metal is obtained by - |
| A. | Calcination |
| B. | Sublimation |
| C. | zone refining |
| D. | None of these |
| Answer» C. zone refining | |
|
Explanation: The principal stages in the production of ultrapure metals are the preparation of pure chemical compounds, the reduction of the compounds to the elementary state and further purification. |
|
| 566. |
Antacids are found in drugs that give relief to - |
| A. | Eye sight |
| B. | Stomach ache |
| C. | Acne |
| D. | Headache |
| Answer» B. Stomach ache | |
|
Explanation: An antacid is a substance which neutralizes stomach acidity. Antacids are taken by mouth to relieve heartburn, the major symptom of gastro-esophageal reflux disease, or acid indigestion which are a few of the common terms used to describe digestive upset. |
|
| 567. |
Heavy water is - |
| A. | Monoterium oxide |
| B. | Polyterium oxide |
| C. | Deuterium oxide |
| D. | Trisium oxide |
| Answer» C. Deuterium oxide | |
|
Explanation: Heavy water (D2O) is also called deuterium oxide. It is water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen, and oxygen. |
|
| 568. |
Mark the compound which possesses ionic, covalent and coordinate bonds. |
| A. | NH4C1 |
| B. | SO3 |
| C. | SO2 |
| D. | H2O |
| Answer» A. NH4C1 | |
|
Explanation: Ammonium chloride (NH4Cl) is generally considered as an ionic compound but this compound has three different types of bond. |
|
| 569. |
Which of the following is the lightest metal? |
| A. | Mercury |
| B. | Silver |
| C. | Lithiu |
| D. | Lead |
| Answer» C. Lithiu | |
|
Explanation: The lightest or least dense metal that is a pure element is lithium, which has a density of 0.534 g/cm3. This makes lithium nearly half as dense as water, so if lithium was not so reactive, a chunk of the metal would float on water. |
|
| 570. |
Fuse wire is made of an alloy of . |
| A. | Lead and Copper |
| B. | Tin and Copper |
| C. | Tin and Lead |
| D. | Copper and Silver |
| Answer» C. Tin and Lead | |
|
Explanation: The material used for making fuse element has a low melting point such as tin, lead, or zinc. |
|
| 571. |
The nuclear particle having no mass and no charge, but only spin is - |
| A. | proton |
| B. | neutrino |
| C. | meson |
| D. | electron |
| Answer» B. neutrino | |
|
Explanation: Neutrinos do not carry electric charge, and have mass quite small, though non- zero. Their mass is tiny even by the standards of subatomic particles. They are electrically neutral, weakly interacting elementary subatomic particles with half-integer spin. |
|
| 572. |
In a period from Li to F, ionisation potential – |
| A. | cannot be predicted |
| B. | increases |
| C. | decreases |
| D. | remains same |
| Answer» A. cannot be predicted | |
|
Explanation: 0 |
|
| 573. |
A nibble is equal to – |
| A. | 32 |
| B. | 4 |
| C. | 8 |
| D. | 16 |
| Answer» B. 4 | |
|
Explanation: In computing, a nibble is a four- bit aggregation, or half an octet. A nibble contains 4 bits. |
|
| 574. |
The non-metal found in the liquid state is – |
| A. | bromine |
| B. | nitrogen |
| C. | fluorine |
| D. | chlorine |
| Answer» A. bromine | |
|
Explanation: Bromine belongs to the halogen group. It is the only non-metal element that is in a liquid form at room temperature. At room temperature it is a reddish brown fuming liquid with an unpleasant chlorine like smell. |
|
| 575. |
Which of the following metals does NOT react with oxygen even at a high temperature? |
| A. | Aluminium |
| B. | Silver |
| C. | Lead |
| D. | line |
| Answer» B. Silver | |
|
Explanation: Silver and gold do not react with oxygen even at high temperatures as they are less reactive and are placed below the reactivity series. |
|
| 576. |
Acetic acid is know as - |
| A. | Caustic soda |
| B. | Spirit |
| C. | Baking soda |
| D. | Vinegar |
| Answer» D. Vinegar | |
|
Explanation: Acetic acid (CH3COOH) also called ethanoic acid, the most important of the carboxylic acids. Vinegar is roughly 3-9% acetic acid by volume making acetic acid the main component of vinegar apart from water. |
|
| 577. |
Which of the following gas is used in cigarette lighters? |
| A. | Butane |
| B. | Propane |
| C. | Methane |
| D. | Ethane |
| Answer» A. Butane | |
|
Explanation: Butane, a highly flammable, colorless, easily liquefied gas used in gas-type lighters and butane torches. Naphtha, a volatile flammable liquid hydrocarbon mixture used in wick-type lighters and burners. |
|
| 578. |
Which one among the following is-used as a moderator in nuclear reactors? |
| A. | Ozone |
| B. | Heavy hydrogen |
| C. | Heavy water |
| D. | Hydrogen peroxide |
| Answer» C. Heavy water | |
|
Explanation: Heavy water is used in certain types of nuclear reactors, where it acts as a neutron moderator to slow down neutrons so that they are more likely to react with the fissile uranium-235 than with uranium238. |
|
| 579. |
The chemical name of baking soda is - |
| A. | Sodium carbonate |
| B. | Sodium bicarbonate |
| C. | Sodium chloride |
| D. | Sodium nitrate |
| Answer» B. Sodium bicarbonate | |
|
Explanation: Sodium bicarbonate (NaHCO3) is also known as baking soda. It is a chemical leavening agent which is added to baked goods before cooking to produce carbon dioxide and cause them to 'rise'. |
|
| 580. |
Chemical name of common salt is – |
| A. | Sodium Chloride |
| B. | Sodium Bicarbonate |
| C. | Sodium |
| D. | Sodium Oxide |
| Answer» A. Sodium Chloride | |
|
Explanation: Sodium chloride, also known as salt, common salt, table salt or halite, is an ionic compound with the chemical formula NaCl, representing equal proportions of sodium and chlorine. In the form of table salt, it is commonly used as a condiment and food preservative. |
|
| 581. |
Nitrogen in water is commonly found in the form of - |
| A. | Nitrous oxide |
| B. | Nitrate |
| C. | Nitric oxide |
| D. | Nitrite |
| Answer» B. Nitrate | |
|
Explanation: Nitrate (NO3) is the most common form of inorganic nitrogen in unpolluted waters. Nitrate moves readily through soils and into ground water, where concentrations can be much higher than insurface waters. Water in coastal areas mainly contains elementary nitrogen gas (N2). |
|
| 582. |
Chemical name of Gammaxane is - |
| A. | Toluene |
| B. | Chloro benzene |
| C. | Aniline |
| D. | Benzene hexachloride |
| Answer» D. Benzene hexachloride | |
|
Explanation: Gammexane is an insecticide that is the gamma isomer of benzene hexachloride. It is also known as lindane. Benzene hexachloride is any of several stereoisomers of 1,2,3,4,5,6- hexachlorocyclohexane formed by the light- induced addition of chlorine to benzene. |
|
| 583. |
The acid which fails to liberate carbon dioxide from sodium bicarbonate is : |
| A. | Acetic acid |
| B. | Formic acid |
| C. | Carbonic acid |
| D. | Sulphuric acid |
| Answer» D. Sulphuric acid | |
|
Explanation: Sodium bicarbonate and organic acid (Formic acid, Acetic acid, Carbonic acid, etc) react vigorously to liberate carbon dioxide. For example, Sodium bicarbonate (NaHCO3) when treated with acetic acid reacts vigorously to liberate carbon dioxide. |
|
| 584. |
Which one of the following is not coal variety? |
| A. | Lignite |
| B. | Bituminous |
| C. | Dolomite |
| D. | Peat |
| Answer» C. Dolomite | |
|
Explanation: Dolomite is a common rock- forming mineral. It is a calcium magnesium carbonate with a chemical composition of CaMg(CO3)2. It is the primary component of the sedimentary rock known as dolostone and the metamorphic rock known as dolomitic marble. Dolomite is used in the Pidgeon process for the production of magnesium. |
|
| 585. |
Which of the following is the strongest base in aqueous solution? |
| A. | Diethylamine |
| B. | Triethylamine |
| C. | Ammonia |
| D. | Ethylamine |
| Answer» A. Diethylamine | |
|
Explanation: Amines are organic derivatives of ammonia, in which one, two, or all three of the hydrogens of ammonia are replaced by organic groups. All aliphatic primary amines are stronger bases than ammonia. |
|
| 586. |
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is - |
| A. | Xenon |
| B. | Krypton |
| C. | Argon |
| D. | Helium |
| Answer» D. Helium | |
|
Explanation: Trimix is a breathing gas, consisting of oxygen, helium and nitrogen, and is often used in deep commercial diving. The helium is included as a substitute for some of the nitrogen, to reduce the narcotic effect of the breathing gas at depth. It helps to reduce nitrogen narcosis and to avoid the dangers of oxygen toxicity. With a mixture of three gases, it is possible to create mixes suitable for different depths or purposes by adjusting the proportions of each gas. |
|
| 587. |
Which of the following substance’s smell is similar to Ethanoic acid? |
| A. | Tomatojuice |
| B. | Kerosene |
| C. | Vinegar |
| D. | Lemon |
| Answer» C. Vinegar | |
|
Explanation: Acetic acid, also known as ethanoic acid, is an organic chemical compound best recognized for giving vinegar its sour taste and pungent smell. Vinegar is roughly 3-9%acetic acid by volume, making acetic acid the main component of-vinegar apart from water. |
|
| 588. |
A powerful eye irritant present in smog is – |
| A. | nitric oxide |
| B. | sulphur dioxide |
| C. | peroxyacetyl nitrate |
| D. | carbon dioxide |
| Answer» C. peroxyacetyl nitrate | |
|
Explanation: Peroxyacetyl nitrate is a secondary pollutant present in photochemical smog. It is thermally unstable and decomposes into peroxyethanoyl radicals and nitrogen dioxide gas. It is a lachrymatory substance. |
|
| 589. |
The most important ore of lead is – |
| A. | Galena |
| B. | Magnetite |
| C. | Pyrolusite |
| D. | Siderite |
| Answer» A. Galena | |
|
Explanation: Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals. |
|
| 590. |
The gas used to dilute oxygen for breathing by deep sea divers is- |
| A. | Neon |
| B. | Argon |
| C. | Nitrogen |
| D. | Helium |
| Answer» D. Helium | |
|
Explanation: Helium is used since it has very low (almost non-existent) narcotic properties. The nitrogen in air is highly narcotic at depth and adding helium allows one to dive without the effects of narcosis (where one's mind is impaired). |
|
| 591. |
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 | |
|
Explanation: 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. |
|
| 592. |
Which of the following is biode- gradable? |
| A. | Paper |
| B. | D.D.T. |
| C. | Aluminium |
| D. | Plastic |
| Answer» A. Paper | |
|
Explanation: Paper is produced by pressing together moist fibers, typically cellulose pulp derived from wood, rags or grasses, and drying them into flexible sheets. |
|
| 593. |
The ‘Green House effect' is produced due to the presence of excess amount of – |
| A. | Sulphur dioxide |
| B. | Nitrogen dioxide |
| C. | Carbon monoxide |
| D. | Methane |
| Answer» D. Methane | |
|
Explanation: By their percentage contribution to the greenhouse effect on Earth the four major gases are: Water vapour (36-70%), Carbon dioxide (9-26%), Methane (4-9%) and Ozone (3- 7%). |
|
| 594. |
Which of the following acids serves as an electrolyte in a lead storage battery? |
| A. | Sulphuric acid |
| B. | Lactic acid |
| C. | Hydrochloric acid |
| D. | Nitric acid |
| Answer» A. Sulphuric acid | |
|
Explanation: Dilute sulfuric acid (H2SO4) serves as the electrolyte in a lead-acid battery. Dilute sulfuric acid used for lead acid battery has ratio (to water) of 3:1 other components of the battery include: Lead peroxide (PbO2) and Sponge lead (Pb). |
|
| 595. |
Which of the following is a natural polymer? |
| A. | Bakelite |
| B. | Nylon |
| C. | Polythene |
| D. | Starch |
| Answer» D. Starch | |
|
Explanation: Cotton, starch, cellulose and rubber are some of the naturally occurring polymers. Starch is a condensation polymer made up of hundreds of glucose monomers, which split out water molecules as they chemically combine. Starch is a member of the basic food group carbohydrates and is fourid in cereal grains and potatoes. It is also referred to as a polysaccharide, because it is a polymer of the monosaccharide glucose. |
|
| 596. |
Which one of the following nonmetals shows allotropy in the liguid state? |
| A. | Carbon |
| B. | Sulphur |
| C. | Phosphorous |
| D. | Bromine |
| Answer» B. Sulphur | |
|
Explanation: Sulphur is a non-metal that shows allotropy in the liquid state. If sulphur is heated slowly the changes between the different forms can be observed. These changes are in the form of colour and viscosity (thickness) of the liquid. If the dark brown liquid sulphur is poured into a beaker of cold water, plastic sulphur is formed. This is an elastic, rubber-like form of sulphur. |
|
| 597. |
Atoms of same element having different mass numbers are Called . |
| A. | Isobars |
| B. | Isotopes |
| C. | (3)Isotones |
| D. | (4) Isomers |
| Answer» B. Isotopes | |
|
Explanation: Atoms that have the same atomic number but different atomic masses are called isotopes. The difference in mass arises due to the atoms containing a different number of neutrons for the same number of protons. For example, carbon-12, carbon-13 and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively. |
|
| 598. |
Bee sting contains - |
| A. | An acidic liquid |
| B. | asalt solution |
| C. | an alkaline liquid |
| D. | acorrosive liquid |
| Answer» A. An acidic liquid | |
|
Explanation: A bee sting is a sting from a bee (honey bee, bumblebee, sweat bee, etc.). Bee stings are acidic. So its effects can be neutralized with bicarbonate of soda or alkali and this reaction reduces the pain. |
|
| 599. |
The nuclear reaction in which a heavy nucleus splits into two nuclei of nearly equal mass is called - |
| A. | Nuclear fusion |
| B. | Nuclear fission |
| C. | Nuclear reaction |
| D. | Fast breeding |
| Answer» B. Nuclear fission | |
|
Explanation: Nuclear fission is a process used to create energy. It is when an atom splits apart into smaller atoms. The process gives off a lot of energy, and is used in nuclear weapons and nuclear reactors. |
|
| 600. |
Which element found in all organic compounds? |
| A. | carbon |
| B. | nitrogen |
| C. | calcium |
| D. | none of them |
| Answer» A. carbon | |
|
Explanation: Carbon is found in all organic matter, but NOT in inorganic matter organic means chemical compounds with carbon in them. In a more general sense, organic refers to living things. |
|
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.