McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) .
| 701. |
Isotopes differ in - |
| A. | No. of electrons |
| B. | No. of protons |
| C. | No. of neutrons |
| D. | Chemical reactivity |
| Answer» C. No. of neutrons | |
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Explanation: Isotopes have the same atomic number because they are the same element but have a different atomic mass because they contain a different number of neutrons. |
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| 702. |
Modern periodic law had been given by |
| A. | Moseley |
| B. | Mendeleev |
| C. | Lother-Mayer |
| D. | Lavoisier |
| Answer» A. Moseley | |
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Explanation: In 1913, H.G.J Moseley in England proved that the more fundamental properties of an element are its atomic number. Therefore he suggested that the basis of classification of elements should be atomic number. |
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| 703. |
Iron filings can be separated from a heterogenous mixture using the technique of |
| A. | Sublimation |
| B. | Magnetization |
| C. | Sedimentation |
| D. | Evaporation |
| Answer» B. Magnetization | |
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Explanation: The method of separation using magnets is used when one of the components is magnetic. So the heterogeneous mixture of iron filings and some other material (such as sulphur powder) can be separated by using magnets. Similarly, a mixture of sand and iron filings can be separated by magnet. |
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| 704. |
The most abundant element by number in the living system is : |
| A. | Nitrogen |
| B. | Hydrogen |
| C. | Oxygen |
| D. | Carbon |
| Answer» B. Hydrogen | |
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Explanation: In sequential order, Hydrogen. Oxygen, Carbon and Nitrogen are the most abundant elements by number in the living system. Hydrogen constitutes 49.8% of living systems, while Oxygen constitutes 24.9%; Carbon and Nitrogen account for 24,9% and 0.27% respectively. It is not surprising, therefore, that the living cell is between 60% and 90% water. |
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| 705. |
Who discovered Potassium? |
| A. | Humphry Davy |
| B. | Alan Turing |
| C. | Bill Gates |
| D. | Tim Berners-Lee |
| Answer» A. Humphry Davy | |
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Explanation: Potassium metal was first isolated in 1807 in England by Sir Humphry Davy, who derived it from caustic potash (KOH, potassium hydroxide) by electrolysis of molten KOH with the newly discovered voltaic pile. |
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| 706. |
Air is - |
| A. | Compound |
| B. | Element |
| C. | Mixture |
| D. | Solution |
| Answer» C. Mixture | |
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Explanation: Pure air is a mixture of several gases that are invisible and colorless. It consists of about 78% nitrogen, 21% oxygen, and less than 1% of argon, carbon dioxide and other gases, as well as varying amounts of water vapour. |
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| 707. |
What is the formula of potassium ion in the noble gas state? |
| A. | K⁺ |
| B. | K²⁺ |
| C. | K²⁻ |
| D. | K⁻ |
| Answer» A. K⁺ | |
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Explanation: 0 |
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| 708. |
The element absorbed both in cation and anion form is – |
| A. | Sulphur |
| B. | Nitrogen |
| C. | Calcium |
| D. | Phosphorus |
| Answer» B. Nitrogen | |
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Explanation: Nitrogen, required in large quantities for healthy plant growth, is supplied either as a cation (ammonium) or an anion (nitrate). The ratio of these two forms of nitrogen in the nutrient solution can have large effects on both the rate and direction of pH changes with time. |
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| 709. |
Browning of paper in old books is caused by – |
| A. | frequent use |
| B. | lack of aeration |
| C. | collection of dust |
| D. | oxidation of cellulose |
| Answer» D. oxidation of cellulose | |
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Explanation: Foxing is a term describing the age-related spots and browning seen on vintage paper documents such as books, postage stamps, certificates, and so forth. It results from localized accelerated oxidation of cellulose or the effect on certain papers of the oxidation of iron, copper, etc. |
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| 710. |
Which of the following is the hardest metal? |
| A. | Gold |
| B. | Iron |
| C. | Platinum |
| D. | Tungstain |
| Answer» D. Tungstain | |
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Explanation: Tungsten has the highest tensile strength of any natural metal, with an ultimate strength of 1510 megapascals. |
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| 711. |
Nuclear sizes are expressed in a unit named - |
| A. | Fermi |
| B. | Angstrom |
| C. | Newton |
| D. | Tesla |
| Answer» A. Fermi | |
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Explanation: The fermi (1 fm = 10⁻¹7 m) is of the order of magnitude of the size of nucleons and nuclei, so it is more appropriate to describe sizes for nuclear phenomena. |
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| 712. |
Which one of the following is responsible for the stimulating effect of tea? |
| A. | Tannin |
| B. | Steroid |
| C. | Alkaloid |
| D. | Flavonoid |
| Answer» C. Alkaloid | |
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Explanation: The stimulating effect of a tea is mainly due to what is called alkaloid caffeine which is then linked with tannin found in a tea leaf. |
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| 713. |
The contact process is involved in the manufacture of - |
| A. | Nitric acid |
| B. | Sulphuric acid |
| C. | Ammonia |
| D. | Caustic soda |
| Answer» B. Sulphuric acid | |
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Explanation: It is also a central substance in the chemical industry. It is widely produced by contact process. Now days, sulphuric acid is prepared by contact process all over the world. Preparation of sulphuric acid by contact process is based upon the catalytic oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3). |
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| 714. |
Which of the following is the purest form of Carbon? |
| A. | Charcoal |
| B. | Granite |
| C. | Diamond |
| D. | Graphite |
| Answer» C. Diamond | |
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Explanation: Because the carbon atoms in diamond are more tightly bound than in graphite (as diamond is the hardest material known), it is more difficult for impurities to get into the diamond lattice and as a result diamonds are often more pure than graphite. |
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| 715. |
Brass is made of – |
| A. | copper and tin |
| B. | tin and lead |
| C. | copper and zinc |
| D. | copper, tin and zinc |
| Answer» C. copper and zinc | |
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Explanation: Brass is an alloy of copper and zinc; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. By Comparison, bronze is principally an alloy of copper and tin. |
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| 716. |
The wine is prepared by the process of - |
| A. | fermentation |
| B. | catalysation |
| C. | conjugation |
| D. | displacement |
| Answer» A. fermentation | |
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Explanation: Like lactic acid fermentation, alcoholic fermentation generates NAD+ so that glycolysis can continue to produce ATP. However, alcoholic fermentation in yeast produces ethyl alcohol instead of lactic acid as a waste product. |
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| 717. |
Compounds with identical molecular formula but different structures are called - |
| A. | Tetravalent compounds |
| B. | Structural isomers |
| C. | Covalent compounds |
| D. | None of the above |
| Answer» B. Structural isomers | |
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Explanation: Structures with identical molecular formula but different structures are called structural isomers. Eg: Butane. |
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| 718. |
PVC is formed by polymerization of - |
| A. | Styrene |
| B. | Acetylene |
| C. | Propene |
| D. | Vinyl Chloride |
| Answer» D. Vinyl Chloride | |
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Explanation: Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer (VCM). About 80% of production involves suspension polymerization. |
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| 719. |
The unit to measure the flow of water is - |
| A. | Micro Mho |
| B. | Ohm meter |
| C. | Milli curie |
| D. | Cusecs |
| Answer» D. Cusecs | |
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Explanation: The unit to measure the flow of water is cusecs. Cusecs is short form of Cubic feet per second. |
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| 720. |
Which of the following metals occurs in free state? |
| A. | Copper |
| B. | Iron |
| C. | Zinc |
| D. | Lead |
| Answer» D. Lead | |
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Explanation: A native metal is any metal that is found in its metallic form, either pure or as an alloy, in nature. Metals that can be found as native deposits singly and/ or in alloys include aluminium, antimony, arsenic, bismuth, cadmium, chromium, cobalt, indium, iron,nickel, selenium, tantalum, tellurium, tin, titanium, and zinc, as well as two groups of metals: the gold group, and the platinum group. The gold group consists of gold, copper, lead, aluminium, mercury, and silver |
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| 721. |
Copper is refined by - |
| A. | roasting |
| B. | oxidation |
| C. | electrolysis |
| D. | zone refining |
| Answer» A. roasting | |
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Explanation: Copper is refined by the method of roasting. In the roaster, the copper concentrate is partially oxidised to produce "calcine" and sulfur dioxide gas. In roasting, the ore or ore concentrate is treated with very hot air. This process is generally applied to sulphide minerals. |
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| 722. |
What is the common name of CaOCI2? |
| A. | Baking Powder |
| B. | Baking Soda |
| C. | Bleaching Powder |
| D. | Washing Soda |
| Answer» C. Bleaching Powder | |
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Explanation: Calcium hypochlorite, an inorganic compound with formula Ca(CIO)2, is commonly known as bleaching powder. It is not highly soluble in water and is more preferably used in soft to medium hard water. |
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| 723. |
Rutherford’s scattering experiment proved the presence of - |
| A. | atoms in all matter |
| B. | electrons in atoms |
| C. | neutrons in atoms |
| D. | nucleusin atoms |
| Answer» D. nucleusin atoms | |
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Explanation: Ernest Rutherford and his fellows Geiger and Marsden proved between 1911 and 1913 the existence of the atomic nucleus. This scattering experirnent led to the development of the Rutherford model (planetary model) of the atom, and eventually to the Bohr model. |
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| 724. |
When a metal is heated in a flame, the electrons absorb energy and jump to higher energy state. On coming back to the lower energy state, they emit light, which we can observe in - |
| A. | Raman spectra |
| B. | Absorption spectra |
| C. | Emission spectra |
| D. | Fluorescence |
| Answer» C. Emission spectra | |
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Explanation: When a metal atom is strongly heated, its electrons absorb the heat energy and jump to a higher energy level. When the electron returns to its original position it gives off-the energy it absorbed in the form of light. The result of all these jumps is to produce what is called an emission spectrum. An emission spectrum is a set of coloured lines that correspond to the energy the electron has released at each stage °fits fall back to its original state. |
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| 725. |
Haemoglobin has the highest affinity with which of the following? |
| A. | SO |
| B. | CO₂ |
| C. | CO |
| D. | NO₂ |
| Answer» C. CO | |
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Explanation: 0 |
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| 726. |
Which of the following gases is produced due to incomplete combustion of fuel? |
| A. | Carbon Dioxide |
| B. | Carbon Monoxide |
| C. | Methane |
| D. | Ethane |
| Answer» B. Carbon Monoxide | |
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Explanation: Carbon monoxide (CO) is an odorless, colorless gas formed by the incomplete com bustion of fuels. It is produced from the partial oxidation of carbon-containing com pounds; it forms when there is not enough oxygen to produce carbon dioxide. |
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| 727. |
Acid used in an automobile battery? |
| A. | Sulphuric acid |
| B. | Hydrochloric acid |
| C. | Nitric acid |
| D. | Citric acid |
| Answer» A. Sulphuric acid | |
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Explanation: Each cell of an automotive battery consists of alternate plates of lead (cathode) and (anode) immersed in an electrolyte of sulfuric acid solution. |
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| 728. |
Which of the following is used as lubricant? |
| A. | Graphite |
| B. | Silica |
| C. | Diamond |
| D. | Iron Oxide |
| Answer» A. Graphite | |
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Explanation: Graphite is used as a lubricant due to its slippery nature. Due to its loosely intact carbon atoms or free electrons, they can move around easily from one place to another, making graphite a good conductor of electricity. |
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| 729. |
Aquaregia is a mixture of the following in the ratio 1 : 3 by volume– |
| A. | cone. HNO3 and cone. HCL |
| B. | conc. HNO3 and conc. H2SO4 |
| C. | dil. HCl and dil. HNO3 |
| D. | cone. HCl and cone. HNO3 |
| Answer» C. dil. HCl and dil. HNO3 | |
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Explanation: Aqua regia or nitro-hydrochloric acid is a highly corrosive mixture of acids which is formed by freshly mixing concentrated Nitric acid (HNO3) and Hydrochloric acid (HCl), optimally in a volume ratio of 1:3. It is used in dissolving gold. |
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| 730. |
In deep-sea diving, divers use a mixture of gases consisting of oxygen and – |
| A. | hydrogen |
| B. | nitrogen |
| C. | argon |
| D. | helium |
| Answer» B. nitrogen | |
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Explanation: Air is not the "ideal" breathing mixture for diving as with a concentration of approximately 79 percent nitrogen, compressed air poses two potential problems for all divers: susceptibility to nitrogen narcosis and at deeper depths; and decompression sickness. So divers use Nitrox, a gaseous mixture of nitrogen and oxygen. It is also known as 'Enriched Air.' |
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| 731. |
Nucleons are regarded as composites sub-particles known as – |
| A. | Mesons |
| B. | Quarks |
| C. | Leptons |
| D. | Photons |
| Answer» B. Quarks | |
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Explanation: 0 |
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| 732. |
Which of the following is not a greenhouse gas? |
| A. | Water vapour |
| B. | O2 |
| C. | O3 |
| D. | CO2 |
| Answer» B. O2 | |
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Explanation: Greenhouse gases are those that can absorb and emit infrared radiation, but not radiation in or near the visible spectrum. The most abundant greenhouse gases in Earth's atmosphere are: Water vapor (H2O), Carbon dioxide (CO2), Methane (CH4), Nitrous oxide (N2O), Ozone (O3) and CFCs. |
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| 733. |
If Metal A displaces Metal B from its solution, then Metal A . |
| A. | is more reactive than B |
| B. | is less reactive than B |
| C. | is heavier than B |
| D. | has the same reactivity as B |
| Answer» A. is more reactive than B | |
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Explanation: 0 |
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| 734. |
Who discovered electrons? |
| A. | Rutherford |
| B. | Niels Bohr |
| C. | JJ Thomson |
| D. | Newton |
| Answer» C. JJ Thomson | |
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Explanation: JJ Thomson, while performing cathode ray experiment found that the cathode ray is made up of very small negatively charged particles to which he termed as electrons. |
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| 735. |
Which is also called Stranger Gas? |
| A. | Xenon |
| B. | Neon |
| C. | Argon |
| D. | Nitrous oxide |
| Answer» A. Xenon | |
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Explanation: Xenon is also called Stranger Gas. The element's name came from the Greek word xenos, which means 'stranger'. Xenon belongs to the group of the noble gases. |
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| 736. |
Silicon is an example of - |
| A. | A metal |
| B. | A non- metal |
| C. | A metalloid |
| D. | Both (2) and (3) |
| Answer» C. A metalloid | |
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Explanation: Metals like Na and Mg are towards the left-hand side of the Periodic Table while the non-metals like sulphur and chlorine are found on the right-hand side. |
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| 737. |
The “King of Metals” is : |
| A. | Gold |
| B. | Silver |
| C. | Iron |
| D. | Aluminium |
| Answer» A. Gold | |
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Explanation: Gold, which is not only the most valuable of metals, but also is without its peer in freedom from alloy, is known as the king of metals. Luxurious, classy and beautiful, gold is the most classic and coveted jewelry metal of all. It is also the oldest precious met-al known to man. |
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| 738. |
The strongest oxidizing agent among the following is: |
| A. | Chlorine |
| B. | Iodine |
| C. | Fluorine |
| D. | Oxygen |
| Answer» C. Fluorine | |
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Explanation: An oxidizing agent is a chemical species that removes an electron from another species. Fluorine, having the largest positive value of electrode potential, is the strongest oxidizing agent. As a matter of fact, all halogens have a tendency to take up electrons and thus act as strong oxidizing agents. |
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| 739. |
A mixture of carbon monoxide and hydrogen is called - |
| A. | Producer gas |
| B. | Water gas |
| C. | Natural gas |
| D. | None |
| Answer» B. Water gas | |
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Explanation: Water gas is a synthesis gas, containing carbon monoxide and hydrogen. It is a useful product but requires careful handling due to its flammability and the risk of carbon monoxide poisoning. |
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| 740. |
In Nuclear reactors graphite is used as |
| A. | Lubricant |
| B. | Fuel |
| C. | Linear of the reactor |
| D. | Modulator |
| Answer» D. Modulator | |
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Explanation: Nuclear reactors are used at nuclear power plants for electricity generation. These are generally graphite moderated and CO2 cooled. |
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| 741. |
Activated Charcoal is used to remove colouring matter from pure substances by – |
| A. | Bleaching |
| B. | Oxidation |
| C. | Adsorption |
| D. | Reduction |
| Answer» C. Adsorption | |
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Explanation: Heating wood to a very high temperature in the absence of air makes charcoal. When it is heated to an even higher temperature, about 930°C, impurities are driven from its surface and it becomes activated charcoal, sometimes called decolorizing charcoal. This activated charcoal can remove impurities in either the gaseous or liquid state from many solutions. It does so by the process of adsorption, or by attracting these molecules to the surface. |
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| 742. |
Chernobyl disaster is the result of pollution by – |
| A. | Oil spill |
| B. | Acid rain |
| C. | Carbon dioxide |
| D. | Radioactive waste |
| Answer» D. Radioactive waste | |
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Explanation: The Chernobyl disaster was a catastrophic nuclear accident that occurred on 26 April 1986 at the Chernobyl Nuclear Power Plant in the city of Pripyat, then located in the Ukrainian USSR. An explosion and fire released large quantities of radioactive particles into the atmosphere, which spread over much of the western USSR and Europe. |
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| 743. |
Which one of the following elements exists in liquid state at room temperature? |
| A. | Mercury |
| B. | Lead |
| C. | Sodium |
| D. | Calcium |
| Answer» A. Mercury | |
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Explanation: Mercury is a dense, silvery d- block element. It is the only metal that is liquid at standard conditions for temperature and pressure. |
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| 744. |
Bone deformities occur due to excessive intake of: |
| A. | Phosphorus |
| B. | Potassium |
| C. | Fatty acid |
| D. | Fluorine |
| Answer» D. Fluorine | |
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Explanation: Bone deformities occur due to excessive intake of Fluorine. |
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| 745. |
The name of the scientist who discovered neutron is - |
| A. | Fermi |
| B. | Rutherford |
| C. | Chadwick |
| D. | Bohr |
| Answer» C. Chadwick | |
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Explanation: Sir James Chadwick, CH, FRS (20 October 1891 – 24 July 1974) was a British physicist who was awarded the 1935 Nobel Prize in Physics for his discovery of the neutron in 1932. |
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| 746. |
Of the following commonly used materials, the one that is not an alloy is - |
| A. | Steel |
| B. | Brass |
| C. | Bronze |
| D. | Copper |
| Answer» D. Copper | |
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Explanation: Copper is not an alloy; it is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. It is used as a constituent of various metal alloys, such as sterling silver used in jewellery, cupronickel used to make marine hardware and coins, and constant an used in strain gauges and thermo- couples for temperature measurement. |
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| 747. |
Bronze is an alloy of – |
| A. | Copper & tin |
| B. | Copper & zinc |
| C. | Copper & iron |
| D. | Iron & nickel |
| Answer» A. Copper & tin | |
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Explanation: Bronze is an alloy consisting primarily of copper, commonly with about 12% tin and often with the addition of other metals (such as aluminium, manganese, nickel or zinc) and sometimes non-metals or metalloids such as arsenic, phosphorus or silicon. These additions produce a range of alloys that may be harder than copper alone, or have other useful properties. |
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| 748. |
Which acid is used in Lead storage batteiy? |
| A. | Sulphuric acid |
| B. | Nitric acid |
| C. | Hydrochlotic acid |
| D. | Acetic acid |
| Answer» A. Sulphuric acid | |
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Explanation: Lead acid battery is a storage battery or secondary battery in which electrical energy can be stored as chemical energy and this chemical energy is then converted to electrical energy as when required. Leadacid batteries are composed of a Lead-dioxide cathode, a sponge metallic Lead anode and a Sulphuric acid solution electrolyte. |
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| 749. |
Ethanoic acid is commonly called - |
| A. | Acetic acid |
| B. | Sulphuric acid |
| C. | Sodium Ethoxide |
| D. | Ethyne |
| Answer» A. Acetic acid | |
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Explanation: Ethanoic acid is commonly called acetic acid and belongs to a group of acids called carboxylic acids. 58% solution of acetic acid in water is called vinegar and is used widely as a preservative in pickles. |
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| 750. |
The bubbles in Chanmpagne and Soda are - |
| A. | Nitrogen |
| B. | Oxygen |
| C. | Carbon dioxide |
| D. | Hydrogen |
| Answer» D. Hydrogen | |
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Explanation: 0 |
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