McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 1001. |
In a freezer ice cubes will be formed more quickly in trays made of - |
| A. | rubber |
| B. | plastic |
| C. | aluminium |
| D. | wood |
| Answer» C. aluminium | |
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Explanation: Aluminium being a good conductor of heat conducts away the heat from the substance quite easily and causes quick freezing. |
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| 1002. |
Who discovered X-rays? |
| A. | W. C. Roentgen |
| B. | Albert Einstein |
| C. | Samuel Cohen |
| D. | Edward Taylor |
| Answer» A. W. C. Roentgen | |
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Explanation: X-rays were discovered by Wilhelm Conrad Roentgen, a Professor at Wuerzburg University in Germany, on 8 November 1895. |
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| 1003. |
The important metal used with iron to produce stainless steel is – |
| A. | Al |
| B. | Chromium |
| C. | Tin |
| D. | Carbon |
| Answer» B. Chromium | |
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Explanation: Stainless steel is an alloy of iron with chromium. Chromium prevents its from corrosion. Stainless steel differs from carbon steel by the amount of chromium present. |
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| 1004. |
Which of the following is an Inert Gas? |
| A. | Hydrogen |
| B. | Nitrogen |
| C. | Oxygen |
| D. | Argon |
| Answer» D. Argon | |
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Explanation: Argon is an inert gas (noble gas) that is placed in Group 18 of the periodic table. It is the most abundant noble gas in Earth's crust, comprising 20.00015% of the crust. Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn) are other noble gases that occur naturally. |
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| 1005. |
Which one of the following metals does not form amalgam? |
| A. | Zinc |
| B. | Copper |
| C. | Magnesium |
| D. | Iron |
| Answer» D. Iron | |
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Explanation: The definition of an amalgam is a mixture of metals and mercury, which can be man-made or can be naturally occurring. |
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| 1006. |
Ozone layer in the upper parts of the atmosphere serves as a protective shield against harmful |
| A. | solar ultraviolet radiation |
| B. | solar infrared radiation |
| C. | CO2 in the air |
| D. | SO2 in the air |
| Answer» A. solar ultraviolet radiation | |
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Explanation: Ozone layer serves as a protective shield against harmful solar ultraviolet radiation. |
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| 1007. |
Which of the following is Colourless? |
| A. | Chlorine |
| B. | Oxygen |
| C. | Phosphorus |
| D. | Sulphur |
| Answer» B. Oxygen | |
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Explanation: 0 |
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| 1008. |
The two metal ions that cause hardness to water are: |
| A. | Calcium, Magnesium |
| B. | Sodium, Calcium |
| C. | Sodium, Potassium |
| D. | Sodium, Magnesium |
| Answer» A. Calcium, Magnesium | |
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Explanation: Calcium and magnesium ion cause hardness of water. |
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| 1009. |
The liquid waste from kitchens and baths, of residences is known as: |
| A. | Domestic sewage |
| B. | Storm water |
| C. | Sullage |
| D. | Refuse |
| Answer» C. Sullage | |
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Explanation: The liquid waste from kitchens and baths, of residence is known as sullage. |
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| 1010. |
Which one of the following is an example of a gel? |
| A. | Cheese |
| B. | Milk |
| C. | Face cream |
| D. | Shaving cream |
| Answer» C. Face cream | |
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Explanation: A gel is a solid, jelly-like material that can have properties ranging from soft and weak to hard and tough. Gels consist of a solid three-dimensional network that spans the volume of a liquid medium and ensnares it through surface tension effects. Shaving creams in a can are commonly dispensed as a foam or a gel. |
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| 1011. |
Quartz is made of – |
| A. | Calcium Sulphate |
| B. | Calcium Silicate |
| C. | Sodium Sulphate |
| D. | Sodium Silicate |
| Answer» D. Sodium Silicate | |
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Explanation: Quartz is an abundant mineral in the Earth's continental crust. It is made tip of a continuous framework of SiO4 silicon-oxygen tetrahedra, wit Ii each oxygen being shared between two tetrahedra, giving an overall formula SiO2. |
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| 1012. |
Which among the following coal contains 90 per cent of carbon? |
| A. | Anthracite |
| B. | Bitumen |
| C. | Lignite |
| D. | Peat |
| Answer» A. Anthracite | |
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Explanation: Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded asmetamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen. Anthracite contains 90 per cent of carbon. |
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| 1013. |
Eposure to mixtures of chemicals are greater than expected on the basis of effects of expo-sure to each chemical individually. This is known as – |
| A. | Additives |
| B. | Antagonism |
| C. | Synergism |
| D. | Independent |
| Answer» C. Synergism | |
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Explanation: When the toxic effect of the mixture is greater than that expected for the sum of individual constituent doses, which is that effects of combined doses are more-than- additive, the interactions are said to be synergistic. Conversely, when the toxic effect of the mixture is less than that expected under the dose additivity assumption, the interactions are said to be antagonistic. |
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| 1014. |
The filter over which sewage is sprinkled is called as – |
| A. | Trickling filter |
| B. | Percolating filter |
| C. | Contact bed |
| D. | Intermittent sand filter |
| Answer» A. Trickling filter | |
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Explanation: A trickling filter, also known as percolating filter, is an artificial bed of stone or broken brick material over which waste water or sewage is allowed to sprinkle or to trickle. It is then collected through the under drainage system. |
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| 1015. |
Which of the following is an iron ore? |
| A. | Bauxite |
| B. | Magnetite |
| C. | Lignite |
| D. | Nitrite |
| Answer» B. Magnetite | |
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Explanation: Magnetite is a 'mineral, one of the two common naturally occurring oxides of Iron. It is the most magnetic of all the naturally occurring minerals on Earth. |
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| 1016. |
Iodine value is used to estimate – |
| A. | Hydroxyl groups in oil |
| B. | Alkali, content in oil |
| C. | Unsaturation in oil |
| D. | Carboxylic groups in oil |
| Answer» C. Unsaturation in oil | |
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Explanation: Iodine value is used to estimate unsatwation in oil. |
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| 1017. |
Element 106 was discovered by – |
| A. | Rutherford |
| B. | Seaborg |
| C. | Lawrence |
| D. | Kurchatove |
| Answer» B. Seaborg | |
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Explanation: Element 106 was discovered by Seaborg. |
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| 1018. |
Milk of magnesia is an example of a/an |
| A. | Acid |
| B. | Base |
| C. | Salt |
| D. | None of the above |
| Answer» B. Base | |
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Explanation: Milk of Magnesia or Magnesium hydrozide is a base and an antacid. During indigestion, the stomach produces too much acidand this causes pain and irritation. To get rid of this pain, people use bases called antacids. |
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| 1019. |
A bee-sting leaves an acid which causes pain and irritation. |
| A. | The injected acid is - |
| B. | acetic acid |
| C. | sulphuric acid |
| D. | citric acid |
| Answer» D. citric acid | |
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Explanation: Formic acid (systematically called methanoic acid) is the simplest carboxylic acid. Its formula is CH2O2 or HCOOH. |
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| 1020. |
Earth's atmosphere is an envelope of gases extending to a height of – |
| A. | 100 km |
| B. | 150 km |
| C. | 200 km |
| D. | 300 km |
| Answer» C. 200 km | |
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Explanation: The atmosphere of the. Earth is an envelope of gases extending to a height of 200km. |
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| 1021. |
In its reaction with silver nitrate, C2H2 shows – |
| A. | Oxidising property |
| B. | Reducing property |
| C. | Basic property |
| D. | Acidic property |
| Answer» D. Acidic property | |
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Explanation: When treated with ammoniacal silver nitrate solution alkynes form white precipitate of silver acetylides. |
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| 1022. |
Iron is extracted from - |
| A. | Cinnabar |
| B. | Haematite |
| C. | Bauxite |
| D. | Dolomite |
| Answer» B. Haematite | |
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Explanation: Haematite is mined as the main ore of iron. It is harder than pure iron, but much more brittle. It is coloured black to steel or silver-gray, brown to reddish brown, or red. |
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| 1023. |
Which of the following imparts a blue colour to glass? |
| A. | Cobalt oxide |
| B. | Copper oxide |
| C. | Iron oxide |
| D. | Nickel oxide |
| Answer» A. Cobalt oxide | |
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Explanation: The addition of oxides, sulfides, salts, and other compounds of different metals to molten glass at the time of manufacture adds colour to glass. The introduction of electrically charged ions which are evenly distributed in the glass during manufacture also gives glass a characteristic colour. Cobalt oxide: deep blue colour; copper oxide: turquoise; chromium: dark green to black; cadmium sulfide: deep yellow, etc. |
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| 1024. |
Of the following, which one pol-lutes the air of a big City? |
| A. | Copper |
| B. | Chromium |
| C. | Lead |
| D. | Cadmium |
| Answer» C. Lead | |
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Explanation: The most common source of lead air pollution is from metal processing, but there are other manufacturing and industry sources as well. The highest lead air pollution levels are found near battery manufacturing and iron and other metal producing plants. Lead air pollution is a dangerous form of pollution because of the way lead builds up in our bodies. |
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| 1025. |
Wood spirit is – |
| A. | Methyl alcohol |
| B. | Ethyl alcohol |
| C. | Butyl alcohol |
| D. | Propyl alcohol |
| Answer» A. Methyl alcohol | |
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Explanation: Methanol is also known as methyl alcohol, wood alcohol, wood naphtha or wood spirits. It acquired the name "wood alcohol" because it was once produced chiefly as a byproduct of the destructive distillation of wood. Modern methanol is produced in a catalytic industrial process directly from carbon monoxide, carbon dioxide, and hydrogen. |
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| 1026. |
Which one of the following petroleum refinery products has the lowest boiling point? |
| A. | Kerosene |
| B. | Gasoline |
| C. | Diesel |
| D. | Lubricating oil |
| Answer» D. Lubricating oil | |
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Explanation: Lubricating oil is the most commonly used lubricant because of its wide range of possible applications. The two basic categories of lube oil are mineral and synthetic. |
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| 1027. |
Liquid metal is - |
| A. | Mercury |
| B. | Sodium |
| C. | Antimony |
| D. | None |
| Answer» A. Mercury | |
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Explanation: Liquid metal consists of gallium- containing alloys with very low melting points which are liquid at room temperature. The standard metal formerly is mercury. |
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| 1028. |
Which of the following is used for removing air bubbles from glass during its manufacture? |
| A. | Fledspar |
| B. | Arsenic oxide |
| C. | Potassium Carbonate |
| D. | Soda Ash |
| Answer» B. Arsenic oxide | |
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Explanation: 0 |
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| 1029. |
The fat of a common mussel-secretes a sticky glue that can be used to make heart implants. The unique chemical compound present in the glue is: |
| A. | Amino phenyl alanine |
| B. | Hydroxy phenyl alanine |
| C. | Phenyl alanine |
| D. | Dihydroxy phenyl alanine |
| Answer» D. Dihydroxy phenyl alanine | |
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Explanation: The foot of the common mussel (Mytilus edulis) produces a sticky glue due to a unique compound called mussel adhesive protein, which contains a high concentration of an amino acid, DOPA (dihydroxyphenylalanine), which can cling to wet surfaces with extraordinary strength. Besides heart implants, the compound could be used as a tooth coating to prevent dental plaque, which is caused by bacterial infection. |
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| 1030. |
Nitrogen is an essential constituent of all: |
| A. | Fats |
| B. | Proteins |
| C. | Vitamins |
| D. | Carbohydrates |
| Answer» B. Proteins | |
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Explanation: Nitrogen is a major constituent of all proteins, and thus of all living organisms. The deficiency of nitrogen causes yellowing of older leaves, stunted plants, dormancy of lateral buds, purple colouration in shoot axis surface, wrinkling of cereal grains and inhibition of cell division. |
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| 1031. |
Thissubstance is commonly used in the kitchen for making tasty crispy pakoras and is sometimes added for faster cooking. Which of the following is it? |
| A. | Baking soda |
| B. | Bleaching powder |
| C. | Vinegar |
| D. | Artificial sweeteners |
| Answer» A. Baking soda | |
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Explanation: Baking soda. When mixed with an acid, baking soda spurs a chemical reaction that produces carbon dioxide gas—or put more simply, it creates bubbles that cause baked goods to rise. |
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| 1032. |
Ferrous sulphate is used in water treatment as a/an - |
| A. | Oxidizing agent |
| B. | Reducing agent |
| C. | Coagulant aid |
| D. | Adsorbent |
| Answer» C. Coagulant aid | |
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Explanation: 0 |
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| 1033. |
Philosopher's Wool is - |
| A. | Zinc carbonate |
| B. | Zinc sulphate |
| C. | Zinc oxide |
| D. | Zinc blende |
| Answer» C. Zinc oxide | |
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Explanation: Philosopher's wool is chemically zinc oxide. |
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| 1034. |
The process by which milk is converted to curd is called – |
| A. | Pasteurization |
| B. | Vernalization |
| C. | Fermentation |
| D. | Retting |
| Answer» C. Fermentation | |
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Explanation: Curds are a dairy product obtained by curdling (coagulating) milk with rennet or an edible acidic substance such as lemon juice or vinegar, and then draining off the liquid portion. The increased acidity causes the milk proteins (casein) to tangle into solid masses, or curds. The remaining liquid, which contains only whey proteins, is the whey. In Asia, curds are essentially a vegetarian preparation using yeast to ferment the milk. |
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| 1035. |
The technique of calculating the age of fossil organisms is - |
| A. | Radiocarbon dating |
| B. | Electroporation |
| C. | Counting the annual rings |
| D. | Micromanipulation |
| Answer» A. Radiocarbon dating | |
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Explanation: Radiocarbon dating (usually referred to as simply carbon dating) is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. The technique of radiocarbon dating was developed by Willard Libby and his colleagues at the University of Chicago in 1949. |
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| 1036. |
Of the following which one pollutes the air of a big city? |
| A. | Copper |
| B. | Chromium |
| C. | Lead |
| D. | Calcium |
| Answer» C. Lead | |
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Explanation: Lead pollution primarily came from cars in the past. Today, lead pollution primarily comes from lead smelters, metal processing plants and incinerators. Deposits of lead in soil can harm both humans and animals by absorbing it into a body. |
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| 1037. |
"Fire-fighting clothes" are made from |
| A. | Mica |
| B. | Asbestos |
| C. | Talc |
| D. | Steatite |
| Answer» B. Asbestos | |
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Explanation: Bunker Gear or "Turnout Gear" are terms used by many firefighters to refer to their system of outer protective clothing. Fire fighter used to be made of asbestos in the past. Because of its carcinogenic properties and other harmful effects, it has slowly been replaced by other substitutes. Fire-fighting and working clothes and accessories for firemen, rescuers and industrials made of materials FR cotton, Nomex, Modacryl, FR viscose and others. |
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| 1038. |
Hydrofluoric acid is not kept in glass bottles because it reacts with - |
| A. | visible light |
| B. | silicon dioxide of glass |
| C. | aluminium oxide of glass |
| D. | sodium oxide of glass |
| Answer» B. silicon dioxide of glass | |
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Explanation: 0 |
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| 1039. |
One light year is equal to - |
| A. | 9.46x 10⁻¹7m |
| B. | 9.46x 10¹7m |
| C. | 9.46x 10⁻¹³m |
| D. | 9.46x 10¹³m |
| Answer» B. 9.46x 10¹7m | |
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Explanation: A light-year is the distance light travels in one year. How far is that? Multiply the number of seconds in one year by the number of miles or kilometers that light travels in one second, and there you have it: one light-year. |
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| 1040. |
Which gas is used in fire extinguishers? |
| A. | Carbon dioxide |
| B. | Nitrogen oxide |
| C. | Carbon monoxide |
| D. | Sulpher dioxide |
| Answer» A. Carbon dioxide | |
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Explanation: Sodium bicarbonate, regular or ordinary used on class B and C fires, was the first of the dry chemical agents developed. In the heat of a fire, it releases a cloud of carbon dioxide that smothers the fire. |
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| 1041. |
Combustion of a candle is a/an - |
| A. | photochemical reaction |
| B. | physical change |
| C. | endothermic reaction |
| D. | exothermic reaction |
| Answer» D. exothermic reaction | |
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Explanation: In theory, a candle is made of a solid hydrocarbon called paraffin. When the solid burns, the hydrocarbon reacts with oxygen to form carbon dioxide and water. The reaction is exothermic, meaning it releases heat to the atmosphere along with the other products. |
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| 1042. |
Another name for baking soda is : |
| A. | Sodium bicarbonate |
| B. | Sodium carbonate |
| C. | Sodium sulphate |
| D. | Sodium hydroxide |
| Answer» A. Sodium bicarbonate | |
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Explanation: Sodium bicarbonate (NaHCO2)is known as baking soda. |
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| 1043. |
Who invented the modern Periodic table? |
| A. | Faraday |
| B. | Mendeleev |
| C. | Newton |
| D. | Bohr |
| Answer» B. Mendeleev | |
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Explanation: Dmitri Mendeleev was a Russian chemist who developed the periodic classification of the elements in 1869 A.D. |
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| 1044. |
Brass is an alloy of - |
| A. | Nickel and Copper |
| B. | Copper and Silver |
| C. | Nickel and Zinc |
| D. | Zinc and Copper |
| Answer» D. Zinc and Copper | |
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Explanation: Brass is an alloy of copper and zinc, in proportions which can be varied to achieve varying mechanical and electrical properties. |
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| 1045. |
"Bhopal gas tragedy" 1984 is related to – |
| A. | Aluminium Phosphide |
| B. | Methyl bromide |
| C. | Methyl isocyanate |
| D. | Carbon dioxide |
| Answer» C. Methyl isocyanate | |
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Explanation: In the Bhopal disaster which took place on 2-3 December, 1984 over 500,000 people were exposed to methyl isocyanate gas and other chemicals. The toxic substance made its way in and around the shantytowns located near the plant. |
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| 1046. |
The percentage of nitrogen present in ammonium sulphate is – |
| A. | 27% |
| B. | 25% |
| C. | 30.5% |
| D. | 18% |
| Answer» A. 27% | |
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Explanation: Ammonium sulfate, (NH4)4SO4 contains 21% nitrogen as ammonium cations, and 24% sulfur as sulfate anions. It is an inorganic salt which is most commonly used as a soil fertilizer. |
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| 1047. |
Surface water is a better source of drinking water because it is poor in - |
| A. | Dust |
| B. | Bacteria |
| C. | Arsenic |
| D. | Algae |
| Answer» C. Arsenic | |
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Explanation: Surface water is a better source of drinking water because it is poor in arsenic. |
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| 1048. |
Saturated hydrocarbons are called - |
| A. | Alkynes |
| B. | Alkenes |
| C. | Alkanes |
| D. | All of the above |
| Answer» C. Alkanes | |
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Explanation: Carbon compounds which contain just carbon and hydrogen are called hydrocarbons. Among these, the saturated hydrocarbons are called alkanes. The unsaturated hydrocarbons which contain one or more double bonds are called alkenes. |
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| 1049. |
Which one of the following elements is polyatomic? |
| A. | Argon |
| B. | Sodium |
| C. | Sulphur |
| D. | Oxygen |
| Answer» C. Sulphur | |
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Explanation: The term polyatomic is used for a molecule or an ion which contains either two or more than two atoms. |
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| 1050. |
Which of the following is not a chemical reaction? |
| A. | Burning of paper |
| B. | Digestion of food |
| C. | Conversion of water into steam |
| D. | Burning of coal |
| Answer» C. Conversion of water into steam | |
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Explanation: Water boiling is a physical reaction only because during physical reaction there is a change of state but during chemical reaction there is breaking or making of bonds. |
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