McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 501. |
Sour taste of lemon is due to the presence of which of the follow-ing? |
| A. | Citric acid |
| B. | Acetic acid |
| C. | Oxalic acid |
| D. | Formic acid |
| Answer» A. Citric acid | |
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Explanation: Lemon juice is about 5% citric acid, which gives lemons a sour taste and a pH of 2 to 3. Citric acid is found in many fruits but lemon contains large quantity of citric acid. The distinctive sour taste of lemon juice makes it a key ingredient in drinks and foods such as lemonade and lemon meringue pie. |
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| 502. |
Ethylene is a molecule. |
| A. | polar |
| B. | ionic |
| C. | covalent |
| D. | nonpolar |
| Answer» D. nonpolar | |
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Explanation: Ethylene (C2H4) is a nonpolar molecule. This is because, unlike a polar molecule, it has an even distribution of electrical charges. Since, the double bond is between two carbon atoms, there is no difference in the electro negativity. This is why, the shared pair of electrons come lie in between those to carbon atoms. As a result, ethylene is a non-polar and linear molecule. |
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| 503. |
If water smells bad, then that odour can be removed by adding – |
| A. | alum |
| B. | bleach |
| C. | activated carbon |
| D. | deactivated nitrogen |
| Answer» C. activated carbon | |
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Explanation: Adding powdered activated carbon to water or using of granular activated carbon (GAC) in the water filter can remove bad taste and foul odour. Powdered activated carbon (PAC) is the preferred method when the taste and odour is moderate and infrequent. Activated carbon works by a phenomenon called "Adsorption", which is where the odour compound is trapped inside the activated carbon and retained, but the material doing the adsorption does not change size. |
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| 504. |
The basic process taking place in nuclear reactors is - |
| A. | Radioactivity |
| B. | Fission |
| C. | Fusion |
| D. | None of the above |
| Answer» B. Fission | |
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Explanation: A nuclear reactor produces and controls the re-lease of energy from splitting the atoms of uranium, known as nuclear fission. When a fissile atomic nucleus such as uranium- 235 or plutonium-239 absorbs a neutron, it undergoes nuclear fission in which the heavynucleus splits into two or more lighter nuclei. The fission process produces free neutrons and gamma pho-tons, and releases a very large amount of energy. |
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| 505. |
Malathion is a/an - |
| A. | insecticide |
| B. | fumigant |
| C. | preservative |
| D. | pesticide |
| Answer» A. insecticide | |
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Explanation: Malathion is an organophosphate (OP) insecticide that has been registered for use in the United States since 1956. It is widely used in agriculture, residential landscaping, public recreation areas, and in public health pest control programs such as mosquito eradication. It is of relatively low human toxicity. |
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| 506. |
Glycol is used to manufacture which of the following? |
| A. | Nylon |
| B. | Artificial silk |
| C. | Terylene |
| D. | Rubber |
| Answer» C. Terylene | |
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Explanation: Monoethylene glycol (MEG), also known as ethylene glycol (EG) or simply glycol, is a diol mostly used for the production of polyester fibers and polyethylene terephthalate (PET) resins. Polyethylene terephthalate is used to produce textiles, large soft-drink containers, photographic film, and overhead transparencies. |
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| 507. |
During fermentation of sugar, the compound which is always formed is – |
| A. | Methyl Alcohol |
| B. | Ethyl Alcohol |
| C. | Acetic Acid |
| D. | Ethylene |
| Answer» B. Ethyl Alcohol | |
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Explanation: Fermentation is the conversion of sugar into car-bon dioxide has (CO2) and ethyl alcohol. This process is carried out by yeast cells using a range of enzymes. |
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| 508. |
Warming Ammonium chloride with sodium hydrochloride in a test tube is an example of – |
| A. | Open system |
| B. | Closed system |
| C. | Isobaric system |
| D. | Isothermal system |
| Answer» A. Open system | |
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Explanation: When heated, ammonlinm chloride decomposes into ammonia and hydrogen chloride. The thermal decomposition of ammonium chloride is a reversible chemical change. On heating above 340°C, it decomposes to form two gases such as ammonia and hydrogen chloride. On cooling, the reaction is reversed and solid ammonium chloride is formed. |
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| 509. |
Laughing gas is – |
| A. | Nitric oxide |
| B. | Nitrous oxide |
| C. | Nitrogen trioxide |
| D. | Nitrogen pentoxide |
| Answer» B. Nitrous oxide | |
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Explanation: Laughing gas is Nitrous Oxide (N2O). |
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| 510. |
Calcium salts used as fertilizer is – |
| A. | Calcium Carbide |
| B. | Calcium Carbonate |
| C. | Calcium Cyanide |
| D. | Calcium Sulphate |
| Answer» D. Calcium Sulphate | |
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Explanation: Sulphur (as sulphate) is a major plant nutrient, and is essential for crop growth. Calcium Sulphate (gypsum) is used to improve soil quality. Calcium sulphate acts as a pH buffer, which can contribute to neutralizing both soil alkalinity and acidity. It is mainly used for the reclamation of sodic soils through ion exchange (calcium replacing sodium). |
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| 511. |
Which one of the following has a maximum tendency to form M^3 ion? |
| A. | N |
| B. | Bi |
| C. | P |
| D. | As |
| Answer» A. N | |
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Explanation: Thee general electronic configuration of group 15 elements (N, P, As, Sb and Bi) is ns2np3. Since Nitrogen has smallest size and greatest electronegativity in the family, it may gain three electrons and attain noble has configuration, forming nitride N3- ions. |
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| 512. |
Copper substances when exposed to air gains a green coating due to the formation of: |
| A. | CuO |
| B. | CuCO3 Cu(OH)2 |
| C. | CuSO4 |
| D. | Cu(NO3)2 |
| Answer» B. CuCO3 Cu(OH)2 | |
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Explanation: When copper is exposed to air, it reacts with moist carbon dioxide in the air and slowly loses its shiny brown surface and gains a green coat. This green substance is basic copper carbonate (CuCO3 Cu(OH)2). The formation of this green coating on the surface of a copper object corrodes it. |
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| 513. |
Bagasse, a by-product of sugar manufacturing industry, is used for the production of - |
| A. | Glass |
| B. | Paper |
| C. | Rubber |
| D. | Cement |
| Answer» B. Paper | |
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Explanation: 0 |
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| 514. |
Bleaching powder is made from - |
| A. | Sulphur dioxide and gypsum |
| B. | Chlorine and Charcoal |
| C. | Soda ash and lime |
| D. | Lime and Chlorine |
| Answer» D. Lime and Chlorine | |
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Explanation: The gas which is used in the preparation of bleaching powder is chlorine. It is a mixture of lime and calcium chloride. |
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| 515. |
Which one of the following does not contain silver? |
| A. | Horn silver |
| B. | Ruby silver |
| C. | German silver |
| D. | Lunar caustic |
| Answer» C. German silver | |
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Explanation: 0 |
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| 516. |
An important green-house gas other than methane being produced from the agricultural fields is– |
| A. | Nitrous oxide |
| B. | Ammonia |
| C. | Sulphur dioxide |
| D. | Arsine |
| Answer» A. Nitrous oxide | |
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Explanation: Nitrous oxide (N2O) and methane (CH4) are the two major greenhouse gasses (GHG) emitted by agricultural activities. N2O accounts for around 8% of the warming impact of current human GHG emissions. |
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| 517. |
Which one of the following contains maximum percentage of carbon? |
| A. | Cast iron |
| B. | Stainless steel |
| C. | Wrought iron |
| D. | High speed steel |
| Answer» A. Cast iron | |
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Explanation: Cast Iron is a hard, brittle, nonmalleable iron-carbon alloy, cast into shape, containing 2 to 4.5 percent carbon. Steels contain less than 2% and usually less than 1% carbon, while all cast irons contain more than 2% carbon. Most steel contains less than 0.35 percent carbon. Wrought iron is an iron alloy with very low carbon (0.04 to 0.08%) content. |
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| 518. |
Whichof the following appeared to be with a significant potential for accumulation through food chains? |
| A. | DDT |
| B. | Parathion |
| C. | Lindane |
| D. | Carbary |
| Answer» A. DDT | |
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Explanation: Mercury and DDT are two persistent toxic materials that accumulate in the food chain and damage the organisms in it. DDT is an insecticide that can pass up the food chain from insects to small birds, and then from the small birds to birds of prey. It is now banned because of this. |
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| 519. |
The moderator used in a nuclear reactor is – |
| A. | Uranium |
| B. | Radium |
| C. | Ordinary water |
| D. | Graphite |
| Answer» C. Ordinary water | |
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Explanation: Light water (ordinary water) is used as the moderator in U.S. reactors as well as the cooling agent. It acts as the means by which heat is removed to produce steam for turning the turbines of the electric generators. |
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| 520. |
Which among the following is a carbohydrate? |
| A. | Nylon |
| B. | Cane-sugar |
| C. | Turpentine |
| D. | Hydrogen peroxide |
| Answer» B. Cane-sugar | |
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Explanation: Cane-sugar is carbohydrate and as this name implies, is composed of carbon, hydrogen and oxygen. it is a source of extracting sugar. There are various types of sugar derived from different sources. Simple sugars are called monosaccharides and include glucose, fructose and galactose. The table or granulated sugar most customarily used as food is sucrose, a disaccharide. Other disaccharides include maltose and lactose. |
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| 521. |
Which among the following metals provides amphoteric oxide? |
| A. | Sodium |
| B. | Silver |
| C. | Aluminium |
| D. | Calcium |
| Answer» C. Aluminium | |
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Explanation: In chemistry, an amphoteric |
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| 522. |
Iodine can be separated from a mixture of Iodine and Potassium Chloride by – |
| A. | sedimentation |
| B. | filtration |
| C. | sublimation |
| D. | distillation |
| Answer» C. sublimation | |
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Explanation: Iodine is well known to sublime (change from solid to gas without becoming liquid in between) when heated. However sodium chloride has a melting point much higher than that of iodine. Therefore, a mixture of iodine and sodium chloride can be separated by using a sublimation apparatus, with solid iodine collected by condensation on a cold surface. |
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| 523. |
Identify the metal which is non toxic in nature. |
| A. | Chromium |
| B. | Gold |
| C. | Cadmium |
| D. | Cobalt |
| Answer» B. Gold | |
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Explanation: Toxic metals are metals that form poisonous soluble compounds and have no biological role, i.e. are not essential minerals, or are in the wrong form. Most often the definition includes at least cadmium, lead, mercury and the radioactive metals. Metals in an oxidation state abnormal to the body may also become toxic: chromium (III) is an essential trace element, but chromium (VI) is a carcinogen. Similarly, cobalt could also be toxic. |
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| 524. |
Bakelite is a copolymer of Phenol and - |
| A. | Formaldehyde |
| B. | Acetaldehyde |
| C. | Benzaldehyde |
| D. | Cinnaldehyde |
| Answer» A. Formaldehyde | |
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Explanation: Bakelite is an early plastic. It is a thermosetting phenol formaldehyde resin, formed from an elimination reaction of phenol with formaldehyde. |
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| 525. |
What is a mixture of potassium nitrate powdered charcoal and sulphur called? |
| A. | paint |
| B. | aluminium |
| C. | brass |
| D. | gun powder |
| Answer» D. gun powder | |
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Explanation: Gun powder is the mixture of potassium nitrate powdered charcoal and sulphur. |
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| 526. |
Which among the following metal is used for galvanization? |
| A. | Zinc |
| B. | Copper |
| C. | Iron |
| D. | Silver |
| Answer» A. Zinc | |
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Explanation: Galvanization is the process of applying a protective zinc coating to steel or iron, to prevent rusting. The most common method is hot-dip galvanizing, in which parts are submerged in a bath of molten zinc. |
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| 527. |
The lightest radioactive element is - |
| A. | deuterium |
| B. | polonium |
| C. | technetium |
| D. | uranium |
| Answer» C. technetium | |
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Explanation: Tritium is a radioactive isotope of hydrogen. It is the lightest radioactive element. |
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| 528. |
The chemical used in developing photographic films is – |
| A. | silver bromide |
| B. | hypo |
| C. | sodium sulphate |
| D. | hydroquinone |
| Answer» A. silver bromide | |
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Explanation: Tritium is a radioactive isotope of hydrogen. It is the lightest radioactive element. |
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| 529. |
Hard water and soft water can be distinguished by using – |
| A. | dilute acid |
| B. | ordinary soap |
| C. | detergent |
| D. | liquid soap |
| Answer» C. detergent | |
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Explanation: 0 |
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| 530. |
Gamma rays are - |
| A. | High energy electrons |
| B. | Low energy electrons |
| C. | High energy electromagnetic |
| D. | High energy positron waves |
| Answer» C. High energy electromagnetic | |
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Explanation: Gamma rays (γ) refer to electromagnetic radiation of an extremely high frequency and therefore consist of high energy photons. |
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| 531. |
The name of unreactive gas is – |
| A. | Carbon dioxide |
| B. | Hydrogen |
| C. | Nitrogen |
| D. | Oxygen |
| Answer» C. Nitrogen | |
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Explanation: Nitrogen is chemically unreactive because it has a strong triple bond which binds the two nitrogen atoms together making it harder for it to be broken. It does not burn, and at ordinary temperatures it does not react with other elements. |
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| 532. |
Heavy water is so called because it contains - |
| A. | Heavy isotope of hydrogen |
| B. | Heavy isotope of oxygen |
| C. | Mole number of hydrogen atoms |
| D. | Mole number of oxygen atoms |
| Answer» A. Heavy isotope of hydrogen | |
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Explanation: Heavy water, formally called deuterium oxide, is a form of "water that contains a larger than normal amount of the hydrogen isotope deuterium, (also known as "heavy hydrogen") rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water. |
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| 533. |
Heating of a ore below its melting point in the absence of air is known as – |
| A. | Refining |
| B. | Calcination |
| C. | Roasting |
| D. | Smelting |
| Answer» B. Calcination | |
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Explanation: Calcination involves simple decomposition of ore on heating below its melting point usually in absence of air to produce new compounds having higher percentage of metal as well as removing the moisture, organic matter and volatile impurities. Calcination makes the ore porous. |
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| 534. |
The most electronegative element among the following is – |
| A. | Fluorine |
| B. | Sodium |
| C. | Chlorine |
| D. | Oxygen |
| Answer» A. Fluorine | |
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Explanation: Electronegativity of the elements using the Pooling Scale is as follows: Fluorine: 3.98, Oxygen: 3.44, Chlorine: 3.16, and Sodium: 0.93. Electronegativity increases down the group and decreases down the period. |
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| 535. |
The quality of petrol is expressed in terms of – |
| A. | Cetane number |
| B. | Gold number |
| C. | Octane number |
| D. | Added unlead compounds |
| Answer» C. Octane number | |
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Explanation: Octane rating or octane number is a standard measure of the of the ignition quality of has (gasoline or petrol). Higher this number, the less susceptible is the gas to `knocking' (explosion caused by its premature burning in the combustioncharnber) when burnt in a standard (spark-ignition internal combustion) engine. |
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| 536. |
The percentage of Nitrogen in Air is - |
| A. | 0.94 |
| B. | 0.03 |
| C. | 78.03 |
| D. | 85.02 |
| Answer» C. 78.03 | |
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Explanation: By volume, thy air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. |
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| 537. |
Energy is continuously generated in the sun due to . |
| A. | Nuclear fusion |
| B. | Nuclear fission |
| C. | Radioactivity |
| D. | Artificial radioactivity |
| Answer» A. Nuclear fusion | |
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Explanation: Nuclear fusion is a nuclear reaction in which two or more atomic nuclei come very close and then collide at a very high speed and join to form a new type of atomic nucleus. |
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| 538. |
The apparatus used to test acidity of aqueous solution is - |
| A. | pH meter |
| B. | Ammeter |
| C. | Hygrometer |
| D. | Acidmeter |
| Answer» A. pH meter | |
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Explanation: A pH meter is an electronic device used for measuring the pH (acidity or alkalinity) of a liquid. A typical pH meter consists of a special measuring probe (a glass electrode) connected to an electronic meter that measures and displays the pH reading. |
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| 539. |
Chemical formula of washing soda is - |
| A. | Na2SO4.10H2O |
| B. | NaHCO3 |
| C. | Na2CO3.10H2O |
| D. | Ca(OH)2 |
| Answer» C. Na2CO3.10H2O | |
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Explanation: Washing Soda is essentially Sodium Carbonate, a sodium salt of carbonic acid (soluble in water). The molecular formula of washing soda is Na2CO3.10H2O. It is used as an agent to soften hard water. It reacts with the calcium and magnesium bonds present in the water, enabling the detergent to work. |
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| 540. |
Which one of the following elements is an example of noble gas? |
| A. | Nitrogen |
| B. | Hydrogen |
| C. | Chlorine |
| D. | Helium |
| Answer» D. Helium | |
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Explanation: Noble gas refers to any of the seven chemical elements that make up Group Villa of the periodic table. The elements are helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), and element 118 (temporarily named ununoctium [Uuo]). |
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| 541. |
Which of the following elements does not exhibit natural radioactivity? |
| A. | Uranium |
| B. | Thorium |
| C. | Aluminium |
| D. | Polonium |
| Answer» C. Aluminium | |
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Explanation: Uranium, Thorium and Polonium are radioactive elements which do not have stable naturally occur-ring isotope. Aluminium is a silvery white, soft, ductile metal. It is the third most abundant element (after oxygen and silicon), and the most abundant metal in the Earth's crust. |
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| 542. |
Which of the following chemicals is responsible for depletion of ozone layer in the atmosphere? |
| A. | Chlorofluorocarbons |
| B. | Nitrous oxide |
| C. | Sulphur dioxide |
| D. | Carbon dioxide |
| Answer» A. Chlorofluorocarbons | |
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Explanation: Chlorofluorocarbon contributes to ozone depletion in the upper atmosphere. It is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, propane. Its manufacture has been phased out under the Montreal Protocol. |
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| 543. |
In which of the following states maximum iron ore is found? |
| A. | FeCO₃ |
| B. | Fe₂O₃ |
| C. | Fe₃O₄ |
| D. | FeS₂ |
| Answer» B. Fe₂O₃ | |
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Explanation: Iron ores are rocks and minerals from which metallic iron can be economically extracted. The ores are usually rich in iron oxides and vary in colour from dark grey, bright yellow, or deep purple to rusty red. |
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| 544. |
The deterioration of a metal by an electrochemical process is commonly termed as – |
| A. | Erosion |
| B. | Corrosion |
| C. | Passivation |
| D. | Abrasion |
| Answer» B. Corrosion | |
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Explanation: Corrosion can be defined as the deterioration of materials by chemical processes. |
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| 545. |
The chief constituent of natural gas is: |
| A. | Methane |
| B. | Helium |
| C. | Nitrogen |
| D. | Propalie |
| Answer» A. Methane | |
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Explanation: Natural gas is a naturally occurring hydrocarbon has mixture consisting primarily of methane (CH4). However, it also includes varying amounts of other higher alkanes (ethane, propane), and a small percentage of carbon dioxide, nitrogen, hydrogen sulfide, or helium. |
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| 546. |
The source of energy that causes the least global warming is – |
| A. | Coal |
| B. | Geothermal energy |
| C. | Natural Gas |
| D. | Petroleum |
| Answer» C. Natural Gas | |
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Explanation: Fossil fuels — coal, petroleum, and natural gas — are the primary culprit behind climate change. They contribute more than 80 percent of greenhouse gas emissions — and 98 percent of CO2 emissions alone. On the contrary, Geothermal energy is thermal energy generated and stored in the Earth. It is clean and sustainable. |
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| 547. |
Which of the following is not a donor atom? |
| A. | Phosphorus |
| B. | Antimony |
| C. | Arsenic |
| D. | Aluminium |
| Answer» D. Aluminium | |
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Explanation: Aluminium is an acceptor atom, an impurity atom in a semiconductor, which can accept or take up one or more electrons from the crystal and become negatively charged. In semiconductor physics. It is a dopant atom that when added to a semiconductor can form a p- type region. |
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| 548. |
Formic acid is produced by – |
| A. | White ants |
| B. | Cockroaches |
| C. | Red ants |
| D. | Mosquitoes |
| Answer» C. Red ants | |
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Explanation: Formic acid (HCO2H) occurs naturally, most notably in some ants. The word "formic" comes from the Latin word for ant, formica, referring to its early isolation by the distillation of ant bodies. It is this compound that causes most of the irritation that occurs immediately following an ant bite or a bee sting. |
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| 549. |
Which one of the following forms of phosphorus is most reactive? |
| A. | Black phosphorus |
| B. | White phosphorus |
| C. | Violet phosphorus |
| D. | Red phosphorus |
| Answer» B. White phosphorus | |
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Explanation: White phosphorus is the most reactive form of phosphorus. It is made up of discrete P4 tetrahedra which are subjected to very high angular strain as the angles is 60 degrees. This high angular strain makes white phosphorus unstable and highly reactive. It ignites spontaneously at about 50°C, and at much lower temperatures if finely divided. |
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| 550. |
Rcmoval of carbon particles from air involves the principle of – |
| A. | Precipitation |
| B. | FiIteration |
| C. | Electrophoresis |
| D. | Sedimentation |
| Answer» C. Electrophoresis | |
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Explanation: Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon parities from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them. |
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