McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 351. |
Which type of radiations are absorbed by the upper layer of the atmosphere? |
| A. | Radio-waves |
| B. | Infrared |
| C. | Visible |
| D. | Ultraviolet |
| Answer» D. Ultraviolet | |
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Explanation: The Troposphere is the layer where the weather happens. Above this layer is the Stratosphere and in between them is the Ozone layer that absorbs the sun's harmful ultraviolet rays. Above the Stratosphere is the Mesosphere, the Thermosphere including the Ionosphere - and the Exosphere. |
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| 352. |
The gas which is mainly responsible for the green house effect is: |
| A. | Ozone |
| B. | Oxygen |
| C. | Carbon dioxide |
| D. | Carbon monoxide |
| Answer» C. Carbon dioxide | |
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Explanation: A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere arewater vapour, carbon dioxide, methane, nitrous oxide, and ozone. |
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| 353. |
Which one of the following is used for dating very old objects of archaeological importance? |
| A. | Phosphorus-31 |
| B. | Tritium |
| C. | Radium |
| D. | Carbon-14 |
| Answer» D. Carbon-14 | |
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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 (140 to estimate the age of carbon-bearing materials up to about 58,000 to 62,000 years. After plants die or they are consumed by other organisms (for example, by humans or other animals), the incorporation of all carbon isotopes, including 14C, stops. Thereafter, the concentration (fraction) of 14C declines at a fixed exponential rate due to the radioactive decay of14C. |
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| 354. |
Which one out of the following helps in burning? |
| A. | carbon dioxide |
| B. | oxygen |
| C. | carbon monoxide |
| D. | nitrogen |
| Answer» B. oxygen | |
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Explanation: Oxygen is the gas that helps / supports combustion (burning). Nitrogen itself does not support burning (though it forms nitrides with some metals). So, air also supports burning. |
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| 355. |
Name the gas which is used in balloons in the place of hydrogen? |
| A. | nitrogen |
| B. | helium |
| C. | neorn |
| D. | argon |
| Answer» B. helium | |
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Explanation: Helium is used in balloons in the place of hydrogen. This is because hydrogen is acombustible gas and when burst can cause skin burns. |
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| 356. |
The temperature at which both the Fahrenheit and Centigrade scales have the same value is – |
| A. | -60° |
| B. | -40° |
| C. | -20° |
| D. | 0° |
| Answer» B. -40° | |
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Explanation: The temperature when both the Celsius and Fahrenheit scales are the same is -40 degrees. |
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| 357. |
The natural resource, known as black gold is – |
| A. | coal |
| B. | lead |
| C. | tin |
| D. | platinum |
| Answer» A. coal | |
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Explanation: The term "coal is a black gold" is just a simple metaphor. Even today, we burn more coal than natural gas, more than nuclear, more than anything. |
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| 358. |
This group of alumino-silicate minerals is widely used in making electrical insulators |
| A. | Bauxite |
| B. | Chrornite |
| C. | Manganese |
| D. | Mica |
| Answer» D. Mica | |
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Explanation: Sheet mica is used principally in the electronic and electrical industries. Its usefulness in these applications is derived from its unique electrical and thermal insulating properties and its mechanical properties, which allow it to be cut, punched, stamped, and machined to close tolerances. Specifically, Mica is unusual in that it is a good electrical insulator at the same time as being a good thermal conductor. |
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| 359. |
Which of the following is a renewable source of energy? |
| A. | Coal |
| B. | Geothermal powder |
| C. | Natural gas |
| D. | Uranium |
| Answer» B. Geothermal powder | |
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Explanation: Geothermal electricity is electricity generated from geothermal energy. Geothermal power is considered to be sustainable because the heat extraction is small compared with the Earth's heat content. |
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| 360. |
The rate of change of linear momentum of a body falling freely under gravity is equal to it's |
| A. | Kinetic Energy |
| B. | Weight |
| C. | Potential Energy |
| D. | Impulse |
| Answer» B. Weight | |
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Explanation: Rate of change of impulse equals the force. In case of freely falling body the only force is the weight. |
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| 361. |
Isobar is produced by the emission of which of the following? |
| A. | X-ray |
| B. | Gamma ray |
| C. | Beta ray |
| D. | Alpha ray |
| Answer» C. Beta ray | |
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Explanation: Isobar, in nuclear physics, any member of a group of atomic or nuclear species all of which have the same mass number-that is, the same total number of protons and neutrons. In beta decay, mother and daughter nuclei are always isobars, because either a neutron is converted to a protonor a proton is converted to a neutron in the process. |
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| 362. |
The main Constituent of natural gas is |
| A. | Methane |
| B. | Ethane |
| C. | Butane |
| D. | Propane |
| Answer» A. Methane | |
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Explanation: Natural has is a naturally occurring hydrocarbon gas mixture consisting primarily of methane, with other hydrocarbons, carbon dioxide, nitrogen and hydrogen sulfide. It is found in deep underground natural rock formations or associated with other hydrocarbon reservoirs in coal beds and as methane clathrates. Petroleum is also another resource found in proximity to and with natural gas. |
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| 363. |
Domestic cooking gas consists mostly of |
| A. | methane and ethane |
| B. | liquefied butane and isobutene |
| C. | hydrogen and acetylene |
| D. | ethylene and carbon monoxide |
| Answer» B. liquefied butane and isobutene | |
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Explanation: Domestic gas is another name for Liquefied Petroleum Gas (LPG). Varieties of LPG bought and sold include mixes that are primarily propane (C3H8), primarily butane (C4H10) and, most commonly, mixes including both propane and butane, depending on the season — in winter more propane, in summer more butane. |
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| 364. |
An example of replenshible energy source is — |
| A. | Coal |
| B. | Petroleum |
| C. | Lignite |
| D. | Biomass |
| Answer» D. Biomass | |
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Explanation: Biomass is biological material from living, or recently living organisms, most often referring to plants or plant-derived materials. As a renewable energy source, biomass can either be used directly, or indirectly--once or converted into another type of energyproduct such as biofuel. Biomass can be converted to energy in three ways: thermal conversion, chemical conversion, and biochemical conversion. |
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| 365. |
Which one of the following minerals is found in pure form? |
| A. | Iron |
| B. | Copper |
| C. | Bauxite |
| D. | Manganese |
| Answer» B. Copper | |
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Explanation: Copper is one of very few elements that are found in essentially pure form in nature. But the bulk of the copper resource is found in other minerals. |
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| 366. |
Bleaching powder is used in drinking water as a/an – |
| A. | disinfectant |
| B. | antibiotic |
| C. | antiseptic |
| D. | coagulant |
| Answer» A. disinfectant | |
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Explanation: Bleach refers to a number of chemicals which remove colour, whiten or disinfect, often via oxidation. Bleaches are used as household chemicals to whiten clothes and remove stains and as disinfectants, primarily in the bathroom and kitchen. Many bleaches have strong bactericidal properties, and are used for disinfecting and sterilizing and thus are used in swimming pool sanitation to control bacteria, viruses and algae and in any institution where sterile conditions are needed. |
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| 367. |
The iron ore which contains 72% of iron is – |
| A. | Magnetite |
| B. | Limonite |
| C. | Haematite |
| D. | Siderite |
| Answer» A. Magnetite | |
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Explanation: Iron (Fe) is a metallic element and composes about 5% of the Earth's crust. When pure it is a dark, silvery-gray metal. It is a very reactive element and oxidizes (rusts) very easily. The reds, oranges and yellows seen in some soils and on rocks are probably iron oxides. The inner core of the Earth is believed to be a solid iron- nickel alloy. Iron-nickel meteorites are believed to represent the earliest material formed at the beginning of the universe. |
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| 368. |
Cement is formed by strongly heating a mixture of – |
| A. | limestone and graphite |
| B. | limestone and clay |
| C. | chalk and graphite |
| D. | clay and graphite |
| Answer» B. limestone and clay | |
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Explanation: Cement is made by heating limestone (calcium carbonate) with small quantities of other materials (such as clay) to 1450 degree C in a kiln, in a process known as calcination, whereby a molecule of carbon dioxide is liberated from the calcium carbonate to form calcium oxide, or quicklime, which is then blended with the other materials that have been included in the mix. |
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| 369. |
Glass is a – |
| A. | superheated solid |
| B. | supercooled liquid |
| C. | supercooled gas |
| D. | superheated liquid |
| Answer» B. supercooled liquid | |
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Explanation: Glass is an amorphous (non- crystalline) solid material. Glasses are typically brittle and optically transparent. The standard definition of a glass (or vitreous solid) is a solid formed by rapid melt quenching. However, the term glass is often used to describe any amorphous solid that exhibits a glass transition temperature Tg. If the cooling is sufficiently rapid (relative to the characteristic crystallization time) then crystallization is prevented and instead the disordered atomic configuration of the supercooled liquid is frozen into the solid state at Tg. Generally, the structureof a glass exists in a meta-stable state with respect to its crystalline form. |
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| 370. |
Which one of the following metals does not react with water to produce Hydrogen ? |
| A. | Potassium |
| B. | Cadmium |
| C. | Sodium |
| D. | Lithium |
| Answer» B. Cadmium | |
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Explanation: Cadmium is a soft, malleable, ductile, bluish-white divalent metal. It is similar in many respects to zinc but forms complex compounds. Unlike other metals, cadmium is resistant to corrosion and as a result it is used as a protective layer when deposited on other metals. As a bulk metal, cadmium is insoluble in water and is not flammable; however, in its powdered form it may burn and release toxic fumes. Cadmium occurs as a minor component in most zinc ores and therefore is a byproduct of zinc production. |
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| 371. |
Ozone consists of - |
| A. | Oxygen only |
| B. | Oxygen and Nitrogen |
| C. | Hydrogen and Carbon |
| D. | Oxygen and Carbon |
| Answer» A. Oxygen only | |
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Explanation: Ozone (O3), or trioxygen, is a triatomic molecule, consisting of three oxygen atoms. It is an allotrope of oxygen that is much less stable than the diatomic allotrope (O2), breaking down with a half life of roughly 30 minutes in the lower atmosphere, to normal dioxygen. Ozone is formed from dioxygenby the action of ultraviolet light and also atmospheric electrical discharges, and is present in low concentrations throughout the Earth's atmosphere. |
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| 372. |
The greenhouse effect is caused by the higher level of which gas in the atmosphere? |
| A. | Carbon monoxide |
| B. | Carbon dioxide |
| C. | Nitrous oxide |
| D. | Sulphur dioxide |
| Answer» B. Carbon dioxide | |
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Explanation: The greenhouse effect is a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases. The environmental effects of carbon dioxide are of significant interest. |
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| 373. |
Which one of the following is extensively used for sterilizing water? |
| A. | Bleaching powder |
| B. | Alum |
| C. | Borax powder |
| D. | Soda powder |
| Answer» A. Bleaching powder | |
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Explanation: Bleaching powder is extensively used in sterilizing water. Calcium hypochlorite is a chemical compound with formula Ca(OCl)2. It is widely used for water treatment and as a bleaching agent (bleaching powder). This chemical is considered to be relatively stable and has greater available chlorine than sodium hypochicnite (liquid bleach). Calcium hypochlorite is a yellow white solid which has a strong smell of chlorine. It is not highly soluble in water, and is more preferably used in soft to medium-hard water. It has two forms: a dry form and a hydrated form. The hydrated form is safer to handle. |
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| 374. |
Which one of the following acids is used in battery? |
| A. | Hydrochloric acid |
| B. | Hydrofluoric acid |
| C. | Sulphuric acid |
| D. | Sulphurous acid |
| Answer» C. Sulphuric acid | |
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Explanation: Battery is a device consisting of one or more electrochemical cells that convert stored chemical energy into electrical energy. Possessing different chemical properties, the sulfuric acid has a wide range of applicationsincluding domestic acidic drain cleaner, electrolyte in lead-acid batteries and various cleaning agents. |
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| 375. |
Natural rubber is a polymer derived from - |
| A. | ethylene |
| B. | propylene |
| C. | isoprene |
| D. | butadiene |
| Answer» C. isoprene | |
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Explanation: Natural rubber is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree. |
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| 376. |
Which one of the following is radioactive? |
| A. | Cesium |
| B. | Platinum |
| C. | Strontium |
| D. | Thorium |
| Answer» D. Thorium | |
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Explanation: Thorium is a naturally occurring radioactive chemical element with the symbol Th and atomic number 90. It was discovered in 1828 by the Norwegian mineralogist Morten ThraneEsmark and identified by the Swedish chemist JonsJakob Berzelius and named after Thor, the Norse god of thunder. In nature, virtually all thorium is found as thorium-232,which undergoes alpha decay with a half-life of about 14.05 billion years. Other isotopes of thorium are short-lived intermediates in the decay chains of higher elements, and only found in trace amounts. |
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| 377. |
When iron rusts, its weight : |
| A. | decreases |
| B. | increases |
| C. | remains the same |
| D. | first increases and then decreases |
| Answer» B. increases | |
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Explanation: When iron rusts, oxide compounds are formed due the interaction between oxygen in the air or in water an the metal. |
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| 378. |
Which of the following is used as filler in tyre of rubber? |
| A. | Carbon black |
| B. | Coal |
| C. | Coke |
| D. | Graphite |
| Answer» A. Carbon black | |
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Explanation: The most common use (70%) of carbon black is as a pigment and reinforcing phase in automobile tires. Carbon black also helps conduct heat away from the tread and belt area of the tire, reducing thermal damage and increasing tire life. |
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| 379. |
Which of the following alloy is used in making magnet? |
| A. | Duralumin |
| B. | Stainless steel |
| C. | Elniko |
| D. | Magnalium |
| Answer» C. Elniko | |
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Explanation: A magnetic alloy is a combination of various metals from the periodic table that contains at least one of the three main magnetic elements: iron (Fe), nickel (Ni), and cobalt (Co). |
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| 380. |
The enzyme that converts glucose to ethyl alcohol is – |
| A. | invertase |
| B. | Maltase |
| C. | Zymase |
| D. | Diastase |
| Answer» C. Zymase | |
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Explanation: ‘ The fermentation of sugar into ethanol is one of the earliest biotechnologies employed by humanity. Fermentation of fermentable sugars by suitable yeast produces ethanol (ethyl alcohol). Yeast is a single celled fungus containing a number of enzymes useful during fermentation. Brewers yeast and wine yeast, for example, contain zymase, an enzyme that can convert glucose to ethanol. |
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| 381. |
Who developed Hydrogen Bomb? |
| A. | Wernher Von Braun |
| B. | J. Robert Oppen Heimer |
| C. | Edward Teller |
| D. | Samuel Cohen |
| Answer» C. Edward Teller | |
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Explanation: Portions of the development and history of the hydrogen bomb remain classified. But it is public knowledge that its chief architect was Dr. Edward Teller. The first H bomb (or thermonuclear bomb / fusion bomb) detonated was on November 1, 1952 in Enewetak in the Marshallislands. The hydrogen bomb is also called the Teller-Ulam design, after Edward Teller and Stanislaw Ulam who helped in the project too. |
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| 382. |
The fundamental particles present in the nucleus of an atom are - |
| A. | Electron, proton |
| B. | Proton, neutron |
| C. | Neutron, electron |
| D. | Neutron, positron |
| Answer» B. Proton, neutron | |
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Explanation: The nucleus is the very dense region consisting of protons and neutrons at the center of an atom. It was discovered in 1911, as a result of Ernest Rutherford's interpretation of the famous 1909 Rutherford experiment performed by Hans Geiger and Ernest. Marsden, under dip direction of Rutherford. The proton— neutron model of nucleus was proposed by Dmity Ivanenko in 1932. Almost all of the mass of an atom is located in the nucleus, with a very small contribution from the orbiting electrons. |
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| 383. |
Bleaching action of moist sulphur dioxide is because of its – |
| A. | basic property |
| B. | acidic property |
| C. | oxidising property |
| D. | reducing property |
| Answer» C. oxidising property | |
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Explanation: In moist conditions, sulphur dioxide is a bleaching agent. In the reducing action of SO2, oxygen is removed from coloured dye. Sulphur dioxide is used to bleach wool and silk. Salts of sulphur dioxide are also used in bleaching. Calcium hydrogen sulphite Ca(HSO3)2 is used to whiten wood pulp in the manufacturing of paper. |
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| 384. |
The long range potential of nuclear energy in India depends on its reserves of – |
| A. | thorium |
| B. | uranium |
| C. | plutonium |
| D. | radium |
| Answer» B. uranium | |
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Explanation: India's domestic uranium reserves are small and the country is dependent on uranium imports to fuel its nuclear power industry. Since early 1990s, Russia has been a major supplier of nuclear fuel-to India. |
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| 385. |
Which of the following gases will effuse out of football bladder most wieldy? |
| A. | He |
| B. | H2 |
| C. | N2 |
| D. | 02 |
| Answer» B. H2 | |
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Explanation: Hydrogen is a chemical element with symbol H and atomic number 1. With an average atomic weight of 1.00794 u (1.007825 u for hydrogen-1), hydrogen is the lightest element and its monatomic form (H1) is the most abundant chemical substance, constituting roughly 75% of the Universe's baryonic mass. Naturally occurring atomic hydrogen is rare on Earth because hydrogen readily forms covalent compounds with most elements and is present in the-water molecule and in most organic compounds. |
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| 386. |
Silk fibre chemically is – |
| A. | Carbohydrate |
| B. | Fat |
| C. | Protein |
| D. | Cellulose |
| Answer» C. Protein | |
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Explanation: Silk is a natural protein fibre, some forms of which can be woven into textiles. The protein fibre of silk is composed mainly of fibroin and produced by certain insect larvae to form cocoons. The best-known type of silk is obtained from the cocoons of the larvae of the mulberry silkworm Bombyxmorireared in captivity (sericulture). The shimmering appearance of silk is due to the triangular prism- like structure of the silk fibre, which allows silk cloth to refract incoming light at different angles, thus producing different colours. |
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| 387. |
Milk tastes sour when it is left in open for some time. This happens due to the formation of |
| A. | Lactic acid |
| B. | Citric acid |
| C. | Acetic acid |
| D. | Carbonic acid |
| Answer» A. Lactic acid | |
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Explanation: Milk contains a sugar called lactose, a disaccharide (compound sugar) made by the glycosidic bonding between glucose and glactose (monosaccharides). When milk is heated to a temperature of 30-40 degrees centigrade and a small amount of old curd added to it, the lactobacillus in that curd sample gets activated and multiplies. These convert the lactose into lactic acid, which imparts the sour taste to curd. |
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| 388. |
The polymerisation of which of the Following is used in manufacturing of polythene in industry? |
| A. | Methane |
| B. | Styrene |
| C. | Acetylene |
| D. | Ethylene |
| Answer» D. Ethylene | |
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Explanation: Ethylene is a rather stable molecule that polymerizes only upon contact with catalysts. The conversion is highly exothermic, that is the process releases a lot of heat. Coordination polymerization is the most pervasive technology, which means that metal chlorides or metal oxides are used. |
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| 389. |
Which of the following substances undergoes chemical change on heating? |
| A. | Sodium chloride |
| B. | Silica |
| C. | Lead nitrate |
| D. | Platinum wire |
| Answer» C. Lead nitrate | |
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Explanation: Lead nitrate on heating decomposes to lead monoxide, nitrogen dioxide and oxygen. NO2 is liberated, along with oxygen, as a reddish brown gas. |
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| 390. |
Who proposed first atomic theory? |
| A. | E. Rutherford |
| B. | De Broglie |
| C. | John Dalton |
| D. | D. I. Mendeleev |
| Answer» C. John Dalton | |
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Explanation: Democritus first suggested the existence of the atom but it took almost twomillennia before the atom was placed on a solid foothold as a fundamental chemical object by John Dalton (1766-1844). |
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| 391. |
Which one of the following has the highest fuel value? |
| A. | Hydrogen |
| B. | Charcoal |
| C. | Natural gas |
| D. | Gasoline |
| Answer» A. Hydrogen | |
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Explanation: Hydrogen has the highest calorific value of (141,790 KJ/kg ) thus have highest fuel value. Calorific value of charcoal, natural gas and gasoline are (29,600; 43,000; 47,300 kJ/ kg) respectively. |
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| 392. |
The major constituent of air is – |
| A. | nitrogen |
| B. | carbon dioxide |
| C. | oxygen |
| D. | hydrogen |
| Answer» A. nitrogen | |
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Explanation: Depending on various geographical locations these may change, but for the most part air is made up of 78% nitrogen (N2), 21% oxygen (O2), and trace amounts of carbon dioxide (CO2), methane (CH4) hydrogen (H2), argon (AO and helium (He). The CO2, CH4, H2, Ar, and He, when combined together, make up about 1% of our air. Nitrogen is a chemical element with symbol N and atomic number 7. Elemental nitrogen is a colourless, odorless, tasteless, and mostly inert diatomic gas at standard conditions, constituting 78.09% by volume of Earth's atmosphere. |
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| 393. |
Cream gets separated out of milk when it is churned. This is due to– |
| A. | gravitational force |
| B. | centripetal force |
| C. | centrifugal force |
| D. | frictional force |
| Answer» C. centrifugal force | |
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Explanation: During the churning of buttermilk, many particles of curd undergorotatory motion: Then the particles with less weight experience more centripetal force and hence those particles accumulate at the center. Heavier particles experience more centrifugal force and so they are forced to the walls of the container away from the centre. |
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| 394. |
Lime water turns milky when carbon dioxide is passed through it. It is due to the for mation of: |
| A. | Calcium Carbonate |
| B. | Barium Carbonate |
| C. | Calcium Hydrogen Carbonate |
| D. | Calcium Oxide |
| Answer» A. Calcium Carbonate | |
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Explanation: When carbon dioxide is passed through lime water for a short time, it turns lime water milky due to formation of a white precipitate of calcium carbonate. |
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| 395. |
German silver is an alloy of - |
| A. | copper, nickel and silver |
| B. | silver, copper and aluminium |
| C. | zinc, copper and nickel |
| D. | silver, zinc and copper |
| Answer» C. zinc, copper and nickel | |
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Explanation: German silver is a copper alloy with nickel and often zinc. The usual formulation is 60% copper, 20% nickel and 20% zinc. |
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| 396. |
One of the constituents of tear gas is - |
| A. | Ethane |
| B. | Ethanol |
| C. | Ether |
| D. | Chloropicrin |
| Answer» D. Chloropicrin | |
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Explanation: Chloropicrin is a colourless liquid that is insoluble in water, with which it is stable. With a vapor pressure of 24 mm Hg, its volatility is between that of phosgene and mustard has in persistency, although closer to phosgene because it is related to the compound. Tests have shown that chloropicrin causes humans to shut their eyes involuntarily.Chloropicrin can be absorbed systemically through inhalation, ingestion, and the skin. |
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| 397. |
An atomic clock is based on transitions in - |
| A. | Sodium |
| B. | Caesium |
| C. | Magnesium |
| D. | Aluminium |
| Answer» B. Caesium | |
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Explanation: An atomic clock is a clock device that uses an electronic transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS. |
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| 398. |
The temperature of oxyacetylene flame is around – |
| A. | 2800°C |
| B. | 3200°C |
| C. | 4000°C |
| D. | 1500°C |
| Answer» B. 3200°C | |
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Explanation: Flames are formed when a fuel gas, like acetylene, reacts with a support has such as oxygen. This reaction creates a lot of heat and light, which we see as a flame. An oxygen acetylene flame can create temperatures over 3200°C. Pure oxygen, instead of air (20% oxygen/80% nitrogen), is used to increase the flame temperature to allow localized melting of the work piece material (e.g. steel) in a room environment. |
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| 399. |
What product is formed when electricity is passed throughan aqueous solution of sodium chloride? |
| A. | Sodium and water |
| B. | Sodium oxide |
| C. | Sodium and chlorine |
| D. | Sodium hydroxide |
| Answer» D. Sodium hydroxide | |
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Explanation: When electricity is passed through an aqueous solution of sodium chloride, it gives hydrogen, chlorine and sodium hydroxide as a product. |
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| 400. |
The atmospheric gas that is mainly responsible for Green House effect – |
| A. | Ozone |
| B. | Nitrogen |
| C. | Oxygen |
| D. | Carbondioxide |
| Answer» D. Carbondioxide | |
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Explanation: A greenhouse was (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. |
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