McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 751. |
Which one is not metal? |
| A. | sulphar |
| B. | sugar |
| C. | nitrogen |
| D. | all |
| Answer» D. all | |
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Explanation: A metal is a material (an element, compound, or alloy) that is typically hard, opaque, and shiny and has good electrical and thermal conductivity. |
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| 752. |
What nucleus of atom contains? |
| A. | protons |
| B. | electrons |
| C. | electrons and protons |
| D. | protons and neutrons |
| Answer» D. protons and neutrons | |
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Explanation: The nucleus, that dense central core of the atom, contains both protons and neutrons. Electrons are outside the nucleus in energy levels. |
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| 753. |
Which of the following caused radioactive pollution along the coast of Kerala? |
| A. | Plutonium |
| B. | Zinc |
| C. | Thorium |
| D. | Radium |
| Answer» C. Thorium | |
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Explanation: Thorium-rich monazite sand deposits on the Kerala coast have been responsible for natural radioactive contamination. It has been pronounced on the south-west coastal line of the state. The region has been found to have elevated levels of background radioactivity due to high abundance of thorium. |
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| 754. |
For extinguishing fire, we use – |
| A. | Hydrogen |
| B. | Carbon Monoxide |
| C. | Carbon Dioxide |
| D. | Marsh has |
| Answer» C. Carbon Dioxide | |
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Explanation: Fire extinguishers use carbon dioxide to displace the oxygen necessary for a fire to burn, extinguishing the blaze. Fires need oxygen, fuel, and heat to ignite, and removing any one of those three components can put out a fire. It is useful for electrical fires and some flammable liquid fires, but may make some gasoline or paper fires worse by dispersing burning material. |
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| 755. |
Which of the following metal has the lowest melting point? |
| A. | Lead |
| B. | Lithium |
| C. | Potassium |
| D. | Sodium |
| Answer» C. Potassium | |
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Explanation: Here, Potassium has the lowest melting point in the given options i.e. 63.5° C. Helium has the lowest melting point of -272.2° C. |
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| 756. |
The main component of liquid bleach is: |
| A. | Sodium chloride |
| B. | Sodium hypochlorite |
| C. | Hydrochloric acid |
| D. | Sodium hypochlorate |
| Answer» B. Sodium hypochlorite | |
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Explanation: Sodium hypochlorite bleaches are also called chlorine or liquid household bleach. They are the more powerful laundry bleaches; they are used to whiten and disinfect laundry, is typically either 5.25 percent (regular strength) or 6 percent sodium hypochlorite (ultra strength). |
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| 757. |
The chemical used as a fixer in photography is - |
| A. | sodium thiosulphate |
| B. | sodium sulphate |
| C. | borax |
| D. | ammonium sulphate |
| Answer» A. sodium thiosulphate | |
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Explanation: Fixation is commonly achieved by treating the film or paper with a solution of thiosulfate salt. Popular salts are sodium thiosulfate — commonly called hypo — and ammonium thiosulfate — commonly used in modern rapid fixer formulae. |
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| 758. |
Which of the following is the most abundant metal on Earth's crust? |
| A. | Magnesium |
| B. | Iron |
| C. | Copper |
| D. | Aluminium |
| Answer» D. Aluminium | |
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Explanation: Aluminum is the most abundant metal in the Earth's crust, and the third most abundant element therein, after oxygen and silicon. It makes up about 8% by weight of the Earth's solid surface. Earth's crust occupies less than 1% of Earth's volume Oxygen is 46.6%, Silicon 27.77%, Aluminum is 8.09% and iron is 5%. |
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| 759. |
Which compound is formed when a Magnesium ribbon is burnt in air? |
| A. | Magnesium Nitrate |
| B. | Magnesium Carbonate |
| C. | Magnesium Oxide |
| D. | Magnesium Nitride |
| Answer» C. Magnesium Oxide | |
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Explanation: When Magnesium burns air it reacts with oxygen present in air to form magnesium oxide. |
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| 760. |
Nuclear fission is caused by the impact of. |
| A. | Proton |
| B. | Electron |
| C. | Neutron |
| D. | (1) and (b) |
| Answer» C. Neutron | |
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Explanation: In such a reaction, free neutrons released by each fission event can trigger yet more events, which in turn release more neutrons and cause more fission. |
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| 761. |
Interveinal necrotic spots on leaves appear due to – |
| A. | HF injuly |
| B. | SO2 injury |
| C. | NO2 injury |
| D. | O3 injury |
| Answer» B. SO2 injury | |
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Explanation: Injury caused by sulphur oxides show interveinal necrotic areas that are light tan to white. Uninjured tissue new to the veins remains green. |
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| 762. |
The pollutant responsible for ozone holes is - |
| A. | CO2 |
| B. | SO2 |
| C. | CO |
| D. | CFC |
| Answer» D. CFC | |
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Explanation: Chlorofluorocarbons (CFCs) have been held responsible for the depletion of ozone layer. The manufacture of CFCs has been phased out under the Montreal Protocol, and they are being replaced with other products such as HFCs. |
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| 763. |
Atomic themy of matter was given by – |
| A. | Avogadro |
| B. | Dalton |
| C. | Newton |
| D. | Pascal |
| Answer» B. Dalton | |
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Explanation: Democritus first suggested the existence of the atom, but John Dalton (1766- 1844) is credited with the Atomic Theory of Matter. According to Dalton, all matter is made of atoms; atoms are indivisible and indestructible; all atoms of a given element are identical in mass and properties; and compounds are formed by a combination of two or more different kinds of atoms. |
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| 764. |
The major component in the LPG is - |
| A. | methane |
| B. | butane |
| C. | ethane |
| D. | propane |
| Answer» B. butane | |
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Explanation: Butanes are highly flammable, colourless, easily liquefied gases. When blended with propane and other hydrocarbons, it is referred to commercially as LPG, for liquified petroleum gas. It is used as a petrol component. |
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| 765. |
Which one of the following is not a 'green house gas'? |
| A. | Chlorofluorocarbons |
| B. | Methane |
| C. | Carbon dioxide |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
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Explanation: The primary greenhouse gases in the Earth's atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. The anthropogenic compound of Chlorofluorocarbons is also a greenhouse gas, with a much higher potential to enhance the greenhouse effect than CO2. |
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| 766. |
Carbon dioxide is – |
| A. | a reducing agent |
| B. | an oxidising agent |
| C. | a dehydrating agent |
| D. | a bleaching agent |
| Answer» A. a reducing agent | |
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Explanation: A good reducing agent must be able to donate electrons readily. This means that it must not have very much attraction for electrons. Carbon dioxide is just like any other oxide and can be reduced to its respective elements by applied energy. |
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| 767. |
An atom of an element has atomic number 17 and mass number 36. The number of neutrons in its nucleus is– |
| A. | 17 |
| B. | 19 |
| C. | 36 |
| D. | 53 |
| Answer» B. 19 | |
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Explanation: Mass Number = number of protons (atomic number) + nu.sriber of neutrons. So as per the question, 36= number of neutrons + 17. Number of neutrons= 36 -17= 19 |
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| 768. |
The most reactive among the halogens is |
| A. | Fluorine |
| B. | Chlorine |
| C. | Bromine |
| D. | Iodine |
| Answer» A. Fluorine | |
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Explanation: Fluorine is one of the most reactive elements in existence, attacking otherwise inert materials such as glass, and forming compounds with the heavier noble gases. It is a corrosive and highly toxic gas. The reactivity of fluorine is such that if used or stored in laboratory glassware, it can react with glass in the presence of small amounts of water to form silicon tetrafluoride (SiF4). |
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| 769. |
Black lung disease occurs in people working in – |
| A. | Electroplating industry |
| B. | Organic solvents industry |
| C. | Paint manufacturing industry |
| D. | Coal mines |
| Answer» D. Coal mines | |
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Explanation: Coal worker's pneumoconiosis, colloquially referred to as black lung disease, is a lung disease that results from breathing in dust from coal, graphite, or man-made carbon over a long period of time. Inhaled coal dust progressively builds up in the lungs and is unable to be removed by the body; that leads to inflammation, fibrosis, and in worse cases, necrosis. |
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| 770. |
NaCI has . |
| A. | Non-polar bonds |
| B. | Polar covalent bonds |
| C. | Metallic bonds |
| D. | Ionic bonds |
| Answer» D. Ionic bonds | |
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Explanation: Sodium Chloride, NaCl. The classic case of ionic bonding, the sodium chloride molecule forms by the ionization of sodium and chlorine atoms and the attraction of the resulting ions. |
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| 771. |
The metal used to recover copper from a solution of copper sulfate is - |
| A. | Na |
| B. | Ag |
| C. | Hg |
| D. | Fe |
| Answer» D. Fe | |
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Explanation: The metal used to recover copper from a solution of copper sulfate is Fe. |
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| 772. |
Which of the following is also known as 'Galena'? |
| A. | Lead sulphate |
| B. | Lead oxide |
| C. | Lead sulphide |
| D. | Calcium sulphate |
| Answer» C. Lead sulphide | |
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Explanation: Galena, also called lead glance, is the natural mineral form of lead sulfide. It is the most important ore of lead and an important source of silver. |
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| 773. |
Which of the following elements has the lowest melting point? |
| A. | Sodium |
| B. | Tin |
| C. | Radon |
| D. | Radium |
| Answer» C. Radon | |
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Explanation: Among the given elements, Radon has the lowest melting point of-71°Celsius. The melting point of other elements are as follows: Sodium: 98° C; Tin 232° C; Radium: 700°C |
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| 774. |
The oxidation number of nickel in K4[Ni(CN)4] is - |
| A. | Zero |
| B. | +4 |
| C. | -4 |
| D. | +8 |
| Answer» A. Zero | |
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Explanation: The oxidation number of nickel in K4[Ni(CN)4] is zero. |
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| 775. |
The rusting of iron is a/an - |
| A. | physical change |
| B. | electrochemical change |
| C. | electrical change |
| D. | None of the above |
| Answer» B. electrochemical change | |
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Explanation: When iron is exposed to air and moisture, its surface gradually corroded and converted into a brown mass. The rusting of iron is due to the formation of hydrated ion. Rusting is an electro-chemical process. |
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| 776. |
Ethanol containing 5% water is known as – |
| A. | Dilute alcohol |
| B. | Power alcohol |
| C. | Rectified spirit |
| D. | Absolute alcohol |
| Answer» C. Rectified spirit | |
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Explanation: A rectified alcohol is highly concentrated ethanol which' has been purified by means of repeated distillation, a process that is called rectification. It typically contains 95% alcohol by volume and 5% water. Normally, ethanol with 5% water is known as pure alcohol. |
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| 777. |
Stains of rust on clothes can be removed by – |
| A. | Oxalic acid |
| B. | Petrol |
| C. | Alcohol |
| D. | H2O2 |
| Answer» A. Oxalic acid | |
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Explanation: Rust stains can be a challenge to remove because the stain consists of tiny iron oxide particles. Acidic solutions work best for these stains. The important ingredient in these removers is an acid - usually oxalic or hydrofluoric acid. The remover ingredients combine with the iron and loosen it from the fabric, then hold it in suspension in the wash water. |
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| 778. |
If a solution turns blue litmus red, its pH is likely to be : |
| A. | 7 |
| B. | 8 |
| C. | 9 |
| D. | 6 |
| Answer» D. 6 | |
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Explanation: An acidic solution turns blue litmus red. On the pH scale, acids have values less than 7, whereas bases have values greater than 7. Solutions with pH equal to 7 are neutral in nature. Therefore the pH of the given solution is likely to be 6. |
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| 779. |
An element with an atomic number of 17 is - |
| A. | an alkali metal |
| B. | a rare gas |
| C. | a halogen gas |
| D. | a transition metal |
| Answer» C. a halogen gas | |
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Explanation: Chlorine has atomic number of 17. It is a halogen gas along with fluorine (F), bromine (Br), iodine (I), and astatine (At). |
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| 780. |
Consider the following and select the right option. |
| A. | Stomach - Hydrochloric acid |
| B. | Ant - formic acid |
| C. | Both are right |
| D. | Both are wrong |
| Answer» C. Both are right | |
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Explanation: Hydrochloric acid is naturally found in the gastric juices of the stomach. It is secreted through the parietal cells of the stomach. |
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| 781. |
As which one of the following, does carbon occur in its purest form in nature? |
| A. | Carbon black |
| B. | Graphite |
| C. | Diamond |
| D. | Coal |
| Answer» C. Diamond | |
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Explanation: The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon. |
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| 782. |
Which among the following is a covalent compound? |
| A. | Calcium chloride |
| B. | Magnesium fluoride |
| C. | Sodium chloride |
| D. | Carbon tetrachloride |
| Answer» D. Carbon tetrachloride | |
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Explanation: Ionic compounds are made up of a metal and non-metal, and covalent compounds are made up of two nonmetals |
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| 783. |
The highest volume of gases in lower atmosphere is comprised of - |
| A. | Hydrogen |
| B. | Carbon dioxide |
| C. | Oxygen |
| D. | Nitrogen |
| Answer» D. Nitrogen | |
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Explanation: There are a number of atmospheric gases which make up air. In the lower atmosphere or troposphere, the main gases are nitrogen and oxygen, which make up 78% and 21% of the volume of air respectively. The remaining 1% of the atmospheric gases is made up of trace gases. |
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| 784. |
The alkoloid naturally found in coffee, cocoa and cola nut is – |
| A. | Cocaine |
| B. | Morphine |
| C. | Tannin |
| D. | Caffeine |
| Answer» D. Caffeine | |
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Explanation: Caffeine (C8H10N4O2) is a bitter alkaloid found especially in coffee, tea, cacao, and kola nuts. It is used medicinally as a stimulant and diuretic. |
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| 785. |
The metal used for making air crafts and rockets is – |
| A. | Lead |
| B. | Aluminium |
| C. | Nickel |
| D. | Copper |
| Answer» C. Nickel | |
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Explanation: Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in corrosive or oxidizing environment. These materials are widely used in aircraft and power-generation turbines, rocket engines, etc. |
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| 786. |
At what temperature is the density of water the maximum? |
| A. | 2°C |
| B. | 4°C |
| C. | 0°C |
| D. | 1°C |
| Answer» B. 4°C | |
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Explanation: An especially notable irregular maximum density is that of water, which reaches a density peak at 3.98 °C (39.16 °F). |
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| 787. |
Soil having high content of aluminum and iron oxide is also known as - |
| A. | meadow soil |
| B. | pedalfer soil |
| C. | chernozen soil |
| D. | podzol soil |
| Answer» B. pedalfer soil | |
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Explanation: Pedalfer soil is composed of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation. |
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| 788. |
Chile saltpeter is the common name of: |
| A. | Sodium nitrate |
| B. | Potassium nitrite |
| C. | Potassium nitrate |
| D. | Sodium nitrite |
| Answer» A. Sodium nitrate | |
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Explanation: Sodium Nitrate (NaNO3) is also known as Chile saltpeter or Peru saltpeter (due to the large deposits found in the Atacama desert in these countries) to distinguish it from ordinary saltpeter, potassium nitrate. Also known as soda niter, it is used in the production of fertilizers, pyrotechnics and smoke bombs, glass and pottery enamels, food preservatives, and solid rocket propellant. |
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| 789. |
The gas liberated in the Bhopal gas tragedy was: |
| A. | Pheynl isocynate |
| B. | Acetylene |
| C. | Ethylene |
| D. | Methyl isocynate |
| Answer» D. Methyl isocynate | |
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Explanation: The Bhopal gas tragedy involved the leakage of poisonous methyl isocyanate (MIC) gas and other chemicals at the Union Carbide India Limited (UCIL) pesticide plant in Bhopal, Madhya Pradesh, on the night of 2-3 December 1984. It is considered the world's worst industrial disaster. |
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| 790. |
Which of the following is not a gaseous air pollutant? |
| A. | Oxides of nitrogen |
| B. | Hydrocarbon |
| C. | Smoke |
| D. | Oxides of sulphur |
| Answer» B. Hydrocarbon | |
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Explanation: The gaseous air pollutants of primary concern in urban settings include sulfur dioxide, nitrogen dioxide, and carbon monoxide; these are emitted directly into the air from the combustion of fossil fuels. Smoke a collection of airborne solid and liquid particulates and gases emitted when a material undergoes combustion, is also a pollutant. Hydrocarbon is an organic compound consisting entirely of hydrogen and carbon. |
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| 791. |
At room temperature, the metal that remains liquid is: |
| A. | Mercury |
| B. | Platinum |
| C. | Lead |
| D. | Zinc |
| Answer» A. Mercury | |
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Explanation: Mercury is the only metal that is a liquid at normal temperatures and pressure. At room temperatureand pressure, mercury neither readily share valence electrons with other atoms nor interact with each other to form a structure or lattice to become a solid. Infact, mercury is the only metal that doesn't form diatomic molecules in the has phase. |
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| 792. |
The chemical name or Quartz is – |
| A. | Calcium oxide |
| B. | Calcium phosphate |
| C. | Sodium phosphate |
| D. | Sodium silicate |
| Answer» D. Sodium silicate | |
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Explanation: Quartz is a compound of one part silicon and two parts of oxygen, silicon dioxide, SiO2. Quartz is the most abundant silica mineral. It is used in a number of industries, the important being glass, foundry, sodium silicate, silicon alloys, etc. The various grades of sodium silicate are characterized by their SiO2:Na2O weight ratio. |
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| 793. |
The depletion in Ozone layer is caused by - |
| A. | Nitrous oxide |
| B. | Carbon dioxide |
| C. | Chlorofluorocarbons |
| D. | Methane |
| Answer» C. Chlorofluorocarbons | |
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Explanation: Chlorofluorocarbons (CFCs), also known as Freon, cause the breakdown of the ozone layer that protects the earth from the sun's ultraviolet (UV) radiation. In the upper atmosphere, the UV-induced breakdown of CFCs releases free, highly reactive chlorine and bromine atoms that lead to the breakdown of the stratospheric ozone layer. Owing to ozone depletion in the upper atmosphere, CFCs have been phased out under the Montreal Protocol of 1987. |
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| 794. |
Which one of the following elements is essential for the construction of nuclear reactors? |
| A. | Cobalt |
| B. | Nicke |
| C. | Zirconium |
| D. | Tungsten |
| Answer» C. Zirconium | |
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Explanation: Zirconium is an essential element for the construction of nuclear reactors. |
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| 795. |
The isotope atoms differ in - |
| A. | number of neutrons |
| B. | atomic number |
| C. | number of electrons |
| D. | atomic weight |
| Answer» A. number of neutrons | |
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Explanation: Important to note that isotope atoms have same atomic number. |
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| 796. |
This substance is sweet-smelling and is used in making perfumes and flavouring agents. It is called- |
| A. | Sodium ethanoate |
| B. | Lime water |
| C. | Hydrogencarbonates |
| D. | Ester |
| Answer» D. Ester | |
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Explanation: The correct answer is Ester. An ester is a sweet-smelling substance, used in making perfumes and flavouring agents. |
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| 797. |
An acid is a substance which |
| A. | Donates a proton |
| B. | Accepts an electron |
| C. | Give H+ in water |
| D. | All |
| Answer» D. All | |
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Explanation: An acid is a chemical substance whose aqueous solutions are characterized by a sour taste, the ability to turn blue litmus red and the ability to react with bases and certain metals to form salts. |
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| 798. |
Two electrons in an orbital are differentiated by which of the following? |
| A. | Magnetic quantum number |
| B. | Spin quantum number |
| C. | Principal quantum number |
| D. | Azimuthal quantum number |
| Answer» B. Spin quantum number | |
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Explanation: Spin quantum number is the is the fourth quantum number that differentiates two electrons in the same orbital. The Pauli exclusion principle states that "no two electrons in an atom can have the same four quantum numbers. This means that no two electrons can have the same state in an atom. Each electron must have a different spin or occupy a different shell from any other. |
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| 799. |
The most abundant element in the earth's atmosphere is – |
| A. | Argon |
| B. | Nitrogen |
| C. | Oxygen |
| D. | Krypton |
| Answer» B. Nitrogen | |
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Explanation: The most abundant gas in the Earth's atmosphere is nitrogen. Nitrogen makes up 78 percent of the Earth's atmosphere, and it is a permanent gas, which means that its percentage does not change on a daily basis. The rest of the atmosphere is made up of 21 percentoxygen, 0.9 percent argon and 0.1 percent trace gases. |
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| 800. |
Chemical composition of cement is – |
| A. | Limestone and Clay |
| B. | Limestone, Clay and Gypsum |
| C. | Limestone and Gypsum |
| D. | Clay and Gypsum |
| Answer» B. Limestone, Clay and Gypsum | |
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Explanation: The two important raw materials used for the preparation of cement are : • Limestone : The chemical formula of limestone is CaCO3 and it is used in the manufacture of cement just to provide CaO. |
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