1. The most important ore of aluminum is
a) Galena
b) Calamine
c) Calcite
d) Bauxite
Explanation: Bauxite is the most important ore of aluminum which contains only 30–54% alumina, Al2O3.
2. Most soluble in water is:
a) Camphor
b) Sulphur
c) Common salt
d) Sugar
Explanation: Most soluble in water is Sugar.
3. Which of the following was to be discovered first in the chromospheres of the sun?
a) Krypton
b) Xenon
c) Neon
d) Helium
Explanation: The chromosphere (literally, "sphere of colour') is the second of the three main layers in the Sun's atmosphere and is roughly 2,000 kilometers deep. It sits just above the photosphere and just below the solar transition region. Helium, the lighter of the noble gases, was the first to be discovered. In fact, this element was first identified in the Sun's chromosphere rather than in the Earth.
4. Which of the following is in liquid form at room temperature?
a) Lithium
b) Sodium
c) Francium
d) Cerium
Explanation: The only liquid elements at standard temperature and pressure are bromine (Br) and mercury (Hg). Although, elements caesium (Cs), rubidium (Rb), Francium (Fr) and Gallium (Ga) become liquid at or just above room temperature.
5.Sodium metal is kept under:
a) Petrol
b) Alcohol
c) Water
d) Kerosene
Explanation: Sodium is the metal stored in kerosene oil in order to prevent it from coming in contact with oxygen and moisture.
6. Quartz crystals normally used in quartz clocks etc. is chemically
a) Silicon Dioxide
b) Germanium Oxide
c) A mixture of Germanium Oxide and Silicon dioxide
d) Sodium Silicate
Explanation: The working of Quartz is usually by a crystal oscillator. The Silicon dioxides are the crystals which are piezoelectric and can be further used as speakers and microphones.
7. Which of the gas is not known as green house gas?
a) Methane
b) Nitrous oxide
c) Carbon dioxide
d) Hydrogen
Explanation: The list of Green House Gases are as follows:
1) Water vapor
2) Carbon dioxide
3) Methane
4) Nitrous oxide
5) Ozone
6) Chlorofluorocarbons.
Hydrogen is not a Green House Gas.
8. Bromine is a
a) Black Solid
b) Red Liquid
c) Colourless Gas
d) Highly Inflammable Gas
Explanation: Bromine (Br), chemical element, a deep red noxious liquid, and a member of the halogen elements, or Group 17 (Group VIIa) of the periodic table.
9. The hardest substance available on earth is
a) Gold
b) Iron
c) Diamond
d) Platinum
Explanation: Diamond is regarded to be the hardest known material in the world.
10. The variety of coal in which the deposit contains recognizable traces of the original plant material is
a) Bitumen
b) Anthracite
c) Lignite
d) Peat
Explanation: The variety of coal in which the deposit contains recognizable traces of the original plant material is peat
11. In which of the following activities silicon carbide is used?
a) Making cement and glass
b) Disinfecting water of ponds
c) Cutting very hard substances
d) Making casts for statues
Explanation: Silicon carbide is used in cutting very hard substances.
12. The average salinity of seawater is
a) 3%
b) 3.5%
c) 2.5%
d) 2%
Explanation: Salinity is generally low at the equator and at the poles, and high at mid-latitudes. The average salinity is about 35 parts per thousand. Stated in another way, about 3.5 percent of the weight of seawater comes from the dissolved salts.
13. When an iron nail gets rusted, iron oxide is formed
a) Without any change in the weight of the nail
b) With decrease in the weight of the nail
c) With increase in the weight of the nail
d) Without any change in colour or weight of the nail
Explanation: When an iron nail gets rusted, iron oxide is formed with increase in the weight of the nail.
14. Galvanised iron sheets have a coating of
a) Lead
b) Chromium
c) Zinc
d) Tin
Explanation: Galvanization is the process of applying a protective zinc coating to steel or iron in order to prevent it from rusting.
15. Among the various allotrope of carbon
a) Coke is the hardest, graphite is the softest
b) Diamond is the hardest, coke is the softest
c) Diamond is the hardest, graphite is the softest
d) Diamond is the hardest, lamp black is the softest
Explanation: Among the various allotrope of carbon diamond is the hardest, graphite is the softest.
16.LPG consists of mainly:
a) Methane, Ethane and Hexane
b) Ethane, Hexane and Nonane
c) Methane, Hexane and Nonane
d) Methane, Butane and Propane
Explanation: Liquefied Petroleum Gas or LPG consists mainly of methane, propane, propylene, butane, and butylene in various mixtures. It is produced as a by-product of natural gas processing and petroleum refining. The components of LPG are gases at normal temperatures and pressures.
17. Air is a/an:
a) Compound
b) Element
c) Electrolyte
d) Mixture
Explanation:Air is a mixture because we can separate its components while in compound we can not separate it.
18. Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in which of the following domestic products?
a) Television
b) Refrigerator
c) Tube light
d) Cooking gas
Explanation: Production of chlorofluorocarbons (CFC) gas which is proposed to be banned in India, is used in refrigerator.
19. Balloons are filled with
a) Nitrogen
b) Helium
c) Oxygen
d) Argon
Explanation: A balloon is a flexible bag that can be inflated with a gas, such as helium, hydrogen, nitrous oxide, oxygen, and air.
20. Which of the following does not contain a coinage metal?
a) Silver and Gold
b) Zinc and Gold
c) Copper and Silver
d) Copper and Gold
Explanation: Zinc and Gold does not contain a coinage metal.
21. The tree which sends down roots from its branches to the soil is known as:
a) Oak
b) Pine
c) Banyan
d) Palm
Explanation: The tree which sends down roots from its branches to the soil is known as banyan tree.
22. Electric bulb filament is made of
a) Copper
b) Aluminum
c) Lead
d) Tungsten
Explanation: Electric bulb filament is made of tungsten.
23. Brass gets discoloured in air because of the presence of which of the following gases in air?
a) Oxygen
b) Hydrogen Sulphide
c) Carbon dioxide
d) Nitrogen
Explanation: Brass gets discolored in air because of the presence of Hydrogen sulphide
24. Which of the following is a non metal that remains liquid at room temperature?
a) Phosphorous
b) Bromine
c) Chlorine
d) Helium
Explanation: Bromine is a chemical element with symbol Br and atomic number 35. It is the third-lightest halogen, and is a fuming red-brown liquid at room temperature that evaporates readily to form a similarly coloured gas. Its properties are thus intermediate between those of chlorine and iodine.
25. Chlorophyll is a naturally occurring chelate compound in which central metal is
a) Copper
b) Magnesium
c) iron
d) Calcium
Explanation: One such chelate is chlorophyll, the green pigment of plants. In chlorophyll the central ion is magnesium, and the large organic molecule is a porphyrin. The porphyrin contains four nitrogen atoms that form bonds to magnesium in a square planar arrangement.
26. The group of metals Fe, Co, Ni may best called as:
a) Transition metals
b) Main group metals
c) Alkali metals
d) Rare metals
Explanation: The group of metals Fe, Co, Ni may best called as transition metals.
27. Heavy water is:
a) Deuterium oxide
b) PH7
c) Rain water
d) Tritium oxide
Explanation: Heavy water is a form of water that contains only deuterium rather than the common hydrogen-1 isotope that makes up most of the hydrogen in normal water.
28. The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:
a) Bromine
b) Fluorine
c) Chlorine
d) Sulphur
Explanation: The chemical (ethyl mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of sulphur.
29. The element common to all acids is.
a) Hydrogen
b) Carbon
c) Sulphur
d) Oxygen
Explanation: Hydrogen is the common element in all acids.
30. Non stick cooking utensils are coated with
a) Black paint
b) PVC
c) Teflon
d) polystyrene
Explanation: Most nonstick pans are coated with polytetrafluoroethylene, also known as Teflon.
31. Which of the following are the ingredients of gun metal?
a) Iron, Zinc and Titanium
b) Iron and Tin
c) Iron, Brass and Tin
d) Copper, Tin and Zinc
Explanation: Modified gunmetal contains lead in addition to the zinc; it is typically composed of 86% copper, 9.5% tin, 2.5% lead, and 2% zinc. It is used for gears and bearings.
32. From which mineral is radium obtained?
a) Rutile
b) Haematite
c) Limestone
d) Pitchblende
Explanation: On April 20, 1902, Marie and Pierre Curie successfully isolate radioactive radium salts from the mineral pitchblende in their laboratory in Paris. In 1898, the Curies discovered the existence of the elements radium and polonium in their research of pitch blende.
33. What is laughing gas?
a) Nitrous Oxide
b) Carbon monoxide
c) Sulphur dioxide
d) Hydrogen peroxide
Explanation: Nitrous oxide, commonly known as laughing gas or nitrous, is a chemical compound, an oxide of nitrogen with the formula N2O
34.Actinides are the elements with atomic numbers from
a) 97 to 104
b) 101 to 115
c) 89 to 103
d) 36 from 43
Explanation: Actinides are the elements with atomic numbers from 89 to 103.
35. The two elements that are frequently used for making transistors are:
a) Boron and Aluminium
b) Silicon and Germanium
c) Iridium and Tungsten
d) Niobium and Columbium
Explanation: The two elements that are frequently used for making transistors are Silicon and Germanium.
36. The filament of an electric bulb is made of
a) Tungsten
b) Nichrome
c) Graphite
d) Iron
Explanation: The filament of an electric bulb is made of Tungsten.
37. Diamond is an allotropic form of:
a) Germanium
b) Carbon
c) Silicon
d) Sulphur
Explanation: Diamond and graphite are two allotropes of carbon: pure forms of the same element that differ in structure.
38. In fireworks, the green flame is produced because of
a) Sodium
b) Barium
c) Mercury
d) Potassium
Explanation: In fireworks, the green flame is produced because of barium.
39. Permanent hardness of water can be removed by adding:
a) Chlorine
b) Washing Soda
c) Potassium Permanganate
d) Bleaching Powder
Explanation: Temporary hardness is due to presence of soluble bicarbonates of calcium and magnesium and permanent hardness is due to the presence of chlorides and sulphate of calcium and magnesium.
40. Marsh gas is
a) Nitrogen
b) Ethane
c) Methane
d) Hydrogen
Explanation: Marsh gas, swamp gas, and bog gas is a mixture of methane, hydrogen sulfide, and carbon dioxide, produced naturally within some geographical marshes, swamps, and bogs.
41. Monazite is an ore of
a) Titanium
b) Zirconium
c) Iron
d) Thorium
Explanation: Monazite is an important ore for thorium, lanthanum, and cerium. It is often found in placer deposits.
42. Carbon, diamond and graphite are together called:
a) Allotrope
b) Isomers
c) Isomorphs
d) Isotopes
Explanation: Carbon, diamond and graphite are together called Allotrope
43. Potassium nitrate is used in
a) Medicine
b) Fertilizer
c) Salt
d) Glass
Explanation: Used in solid propellants, explosives, fertilizers. Potassium nitrate is the inorganic nitrate salt of potassium. It has a role as a fertilizer.
44. Permanent hardness of water may be removed by the addition of:
a) Sodium Carbonate
b) Alum
c) Potassium Permanganate
d) Lime
Explanation: Temporary hardness can be removed by boiling or by addition of Ca(OH)2. Permanent hardness can be removed by the addition of washing soda commonly known as sodium carbonate.
45. Soda water contains
a) Carbonic acid
b) Sulphuric acid
c) Carbon dioxide
d) Nitrous acid
Explanation: Carbonated water or Soda water is water that has been infused with carbon dioxide gas under pressure. It is carbonic acid. This produces a bubbly drink that's also known as sparkling water, club soda, soda water, seltzer water and fizzy water. With the exception of seltzer water, they usually have salt added to improve the taste.
46. Which of the following is used in pencils?
a) Graphite
b) Silicon
c) Charcoal
d) Phosphorous
Explanation: Graphite is used in pencils
47. Which of the following metals forms an amalgam with other metals?
a) Tin
b) Mercury
c) Lead
d) zinc
Explanation: Almost all metals can form amalgams with mercury, the notable exceptions being iron, platinum, tungsten, and tantalum.
48.Chemical formula for water is
a) NaAlO2
b) H2O
c) Al2O3
d) CaSiO3
Explanation: Chemical formula for water is H2O.
49. The gas usually filled in the electric bulb is
a) Nitrogen
b) Hydrogen
c) Carbon dioxide
d) Oxygen
Explanation: Incandescent light bulbs are filled with an inert gas like nitrogen, argon, or krypton - so that the filament doesn't catch fire. Early ones were a vacuum.
50.Washing soda is the common name for
a) Sodium Carbonate
b) Calcium Bicarbonate
c) Sodium Bicarbonate
d) Calcium Carbonate
Explanation: Sodium carbonate decahydrate, also known as washing soda, is the most common hydrate of sodium carbonate containing 10 molecules of water of crystallization.
51. Tetraethyl lead is used as
a) Pain Killer
b) Fire Extinguisher
c) Mosquito Repellent
d) Petrol Additive
Explanation: Tetraethyl lead is used as Petrol Additive.
52. Which of the following is used as a lubricant?
a) Graphite
b) Silica
c) Iron Oxide
d) Diamond
Explanation: Graphite is structurally composed of planes of polycyclic carbon atoms that are hexagonal in orientation. The distance of carbon atoms between planes is longer and therefore the bonding is weaker. Graphite is best suited for lubrication in air.
It is a mineral made of loosely bonded sheets of carbon atoms, giving it a slippery texture that makes it a very effective lubricant. This slippery quality also makes graphite a good material for pencil lead because it easily sloughs off onto paper.
Graphite is bonded by covalent bond, thus, it is helf by weak intermolecular forces. Since it has weak intermolecular forces, graphite would be slippery and soft enough to act as a lubricant.
53. The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
a) Argon
b) Xenon
c) Helium
d) Krypton
Explanation: The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is Helium.
54. The gases used in different types of welding would include
a) Oxygen and Hydrogen
b) Oxygen, Hydrogen, Acetylene and Nitrogen
c) Oxygen, Acetylene and Argon
d) Oxygen and Acetylene
Explanation: The gases used in different types of welding would include Oxygen and Acetylene.
55. The property of a substance to absorb moisture from the air on exposure is called
a) Osmosis
b) Deliquescence
c) Efflorescence
d) Desiccation
Explanation: Deliquescence, the process by which a substance absorbs moisture from the atmosphere until it dissolves in the absorbed water and forms a solution.
56. Which metal pollute the air of a big city?
a) copper
b) Chromium
c) Lead
d) Cadmium
Explanation: Major sources of lead emissions to the air today are ore and metals processing and piston-engine aircraft operating on leaded aviation gasoline. The highest air concentrations of lead are usually found near lead smelters
57. Bell metal is an alloy of
a) Nickel and Copper
b) Zinc and Copper
c) Brass and Nickel
d) Tin and Copper
Explanation: Bronze used for making bells and gongs is essentially an alloy of copper and tin
58.Water is a good solvent of ionic salts because:
a) It has a high specific heat
b) It has no colour
c) It has a high dipole moment
d) It has a high boiling point
Explanation: It has a high dipole moment
59. Which of the following is not an isotope of hydrogen?
a) Tritium
b) Deuterium
c) Protium
d) Yttrium
Explanation: Yttrium is not an isotope of hydrogen
60. The main constituents of pearls are
a) Calcium Oxide and Ammonium Chloride
b) Calcium Carbonate and Magnesium Carbonate
c) Aragonite and Conchiolin
d) Ammonium Sulphate and Sodium Carbonate
Explanation: The main constituents of pearls are Calcium Carbonate and Magnesium Carbonate.
61. Atoms of an element differ from those of all other elements in
a) Atomic number and electronic configuration
b) Number of neutrons and number of valence electrons
c) Atomic number and number of valence electrons.
d) Number of neutrons and electronic configuration.
Explanation: Atoms of an element differ from those of all other elements in number of neutrons and electronic configuration.
62. Nuclear fission is caused by the impact of:
a) Neutron
b) Proton
c) Deuteron
d) Electron
Explanation: Nuclear fission in fissile fuels is the result of the nuclear excitation energy produced when a fissile nucleus captures a neutron.
63. Which of the following rays are the most penetrating?
a) Beta rays
b) Alpha rays
c) Gamma rays
d) X-rays
Explanation: Gamma radiation is the most penetrating of the three radiations. It can easily penetrate body tissue
64. How many colours the sunlight spectrum has?
a) Three
b) Seven
c) Four
d) Five
Explanation: We can observe on the paper that the sunlight is split into a spectrum of colours like a rainbow, every colour in VIBGYOR pattern i.e., violet, indigo, blue, green, yellow, orange and red can be seen. The conclusion drawn here is that sunlight is nothing but a mixture of seven colours.
65.Which is/are the important raw material(s) required in cement industry?
a) Gypsum and Clay
b) Clay
c) Limestone and Clay
d) Limestone
Explanation: The important raw material(s) required in cement industry Limestone and Clay.
66. Light year is a measurement of
a) Speed of aeroplanes
b) Speed of light
c) Stellar distances
d) Speed of rockets
Explanation: Light year is a measurement of Stellar distances
67. very small time intervals are accurately measured by
a) White dwarfs
b) Quartz clocks
c) Atomic clocks
d) Pulsars
Explanation: 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
68. One kilometer is equal to how many miles?
a) 0.84
b) 0.5
c) 1.6
d) 0.62
Explanation: One kilometer is equal to 0.62 mile.
69. Kilohertz is a unit which measures
a) Power used by a current of one ampere
b) Electromagnetic radio wave frequencies
c) Voltage
d) Electric resistance
Explanation: Kilohertz is a unit which measures electromagnetic radio wave frequencies.
70. One horse power is equal to
a) 746 watts
b) 748 watts
c) 756 watts
d) 736 watts
Explanation: Electrical equivalent of one horsepower is 746 watts in the International System of Units (SI), and the heat equivalent is 2,545 BTU (British Thermal Units) per hour.
71. In an atomic explosion, enormous energy is released which is due to
a) Conversion of chemical energy into heat energy
b) Conversion of mechanical energy into nuclear energy
c) Conversion of mass into energy
d) Conversion of neutrons into protons
Explanation: In an atomic explosion, enormous energy is released which is due to the conversion of mass into energy. Since most of the mass of ordinary objects resides in protons and neutrons, converting all the energy of ordinary matter into more useful energy requires that the protons and neutrons be converted to lighter particles, or particles with no rest-mass at all. Based on Einstein's equation E = mc2, the amount of energy added is relative to the mass gained by the proton multiplied by the speed of light squared. In other words, a lot of energy is converted into a relatively small amount of mass.
72. Isotopes are separated by:
a) Crystallisation
b) Sublimation
c) Distillation
d) Filtration
Explanation: Isotopes are separated by Distillation.
73. The wavelength of X-rays is of the order of
a) 10 micron
b) 1 angstrom
c) 1 cm
d) 1 m
Explanation: The wavelength of x-ray is 1 angstrom.
74. Mesons are found in
a) Laser beam
b) X-rays
c) Gamma rays
d) Cosmic rays
Explanation: Mesons are not produced by radioactive decay, but appear in nature only as short-lived products of very high-energy interactions in matter, between particles made of quarks. In cosmic ray interactions, for example, such particles are ordinary protons and neutrons. Mesons are hadronic subatomic particles composed of one quark and one anti-quark, bound together by the strong interaction. Because mesons are composed of sub-particles, they have a physical size, with a radius roughly one femtometre, which is about 2/3 the size of a proton or neutron. All mesons are unstable, with the longest-lived lasting for only a few hundredths of a microsecond. Charged mesons decay (sometimes through intermediate particles) to form electrons and neutrinos
75. Which radioactive pollutant has recently drawn to public, due to its occurrence in the building material?
a) Thorium
b) Radium
c) Plutonium
d) Radan
Explanation: Thorium radioactive pollutant has recently drawn attention of public due to its occurrence in the building material.
Thorium is a naturally-occurring, slightly radioactive metal discovered in 1828 by the Swedish chemist Jons Jakob Berzelius, who named it after Thor, the Norse god of thunder. It is found in small amounts in most rocks and soils, where it is about three times more abundant than uranium.
The alpha particles can travel only very short distances through most materials and cannot go through human skin.
76. The vast resources of unutilised natural gas can be used in the production of
a) Graphite
b) Synthetic petroleum
c) Fertilisers
d) Carbide
Explanation: The vast resources of unutilised natural gas can be used in the production of fertilisers.
77.Paper is manufactured by
a) Wood and resin
b) Wood, sodium and bleaching powder
c) Wood, calcium, hydrogen sulphide and resin
d) Wood and bleaching powder
Explanation:Paper is a thin sheet material produced by mechanically and/or chemically processing cellulose fibres derived from wood, rags, grasses or other vegetable sources in water, draining the water through fine mesh leaving the fibre evenly distributed on the surface, followed by pressing and drying.
78. Gypsum is added to cement clinker to
a) Increase the tensile strength of cement
b) Decrease the rate of setting of cement
c) Facilitate the formation of colloidal gel
d) Bind the particles of calcium silicate
Explanation: During cement manufacturing process upon cooling of clinker a small amount of gypsum is added during the final grinding process. Gypsum controls the setting of the cement and if not added the cement will set immediately leaving no time for concrete placing.
79. Soap is a mixture of sodium or potassium salts of
a) Dicarboxylic acids
b) Mono-carboxylic acids
c) Glycerol
d) Tricarboxylic acids
Explanation: Soaps are made from the sodium and potassium salts of long chain carboxylic acids.
80.The type of glass used in making lenses and prisms is
a) Jena glass
b) Soft glass
c) Pyrex glass
d) Flint glass
Explanation: In the optical glass industry, flint glass is any highly refractive lead-containing glass used to make lenses and prisms. Because it absorbs most ultraviolet light but comparatively little visible light, it is also used for telescope lenses.
81. 'Bar' is the unit of
a) Temperature
b) Heat
c) Atmospheric pressure
d) Current
Explanation: The bar (symbol bar) is widely used in many countries as a unit of pressure.
82. One Joule is equal to
a) 105 ergs
b) 103 ergs
c) 107 ergs
d) 1011 ergs
Explanation: One Joule is equal to 107 ergs.
83. Kilowatt is a unit to measure:
a) Work
b) Power
c) Electricity
d) Current
Explanation: The power consumption of small devices is usually measured in Watts, and the power consumption of larger devices is measured in kilowatts (kW), or 1,000 Watts.
84. Electric current is measured by:
a) Commutator
b) Anemometer
c) Ammeter
d) Voltmeter
Explanation: An instrument called ammeter measures electric current in a circuit. It is always connected in series in a circuit through which the current is to be measured. Also ammeter has negligible resistance, thus no voltage gets dropped across it
85. A chronometer measures:
a) Colour contrast
b) Sound waves
c) Time
d) Water waves
Explanation: A chronometer measures time.
86. Which one of the following is the petroleum wax?
a) Paraffin wax
b) Jonoba wax
c) Carnauba wax
d) Bees wax
Explanation: Paraffin wax is obtained from petroleum by dewaxing light lubricating oil stocks. It is used in candles, wax paper, polishes, cosmetics, and electrical insulators. It assists in extracting perfumes from flowers, forms a base for medical ointments, and supplies a waterproof coating for wood. In wood and paper matches, it helps to ignite the matchstick by supplying an easily vaporized hydrocarbon fuel.
87. What cause a moving body to resist a change in its state of motion?
a) Displacement
b) Acceleration
c) Inertia
d) Velocity
Explanation: Inertia: tendency of an object to resist changes in its velocity. An object at rest has zero velocity - and (in the absence of an unbalanced force) will remain with a zero velocity. Such an object will not change its state of motion (i.e., velocity) unless acted upon by an unbalanced force
88. BACK TO VILLAGES slogan was given by:
a) Lenin
b) Mao
c) Nehru
d) Patel
Explanation: BACK TO VILLAGES slogan was given by Mao.
89. AIDS is caused by:
a) Bacteria
b) Fungus
c) Helminth
d) Virus
Explanation: Acquired immunodeficiency syndrome (AIDS) is a chronic, potentially life-threatening condition caused by the human immunodeficiency virus (HIV). By damaging your immune system, HIV interferes with your body's ability to fight infection and disease.
90. Which of the following schemes is launched for the school going children:
a) Lok Jumbish
b) Mid day meal
c) Sarva Shiksha Abhiyan
d) Aayush
Explanation: Mid day meal scheme is a scheme introduced by the government to promote basic primary education. The scheme helps to provide better nutrients to the kids by providing food. It is introduced with the intention to increase attendance, retain kids, and also improves nutritional level of the kids.
91. Which of the following is a protein?
a) Natural rubber
b) Starch
c) Cellulose
d) None of these
Explanation: Natural rubber is a protein.
92. Wood is the main raw material for the manufacture of
a) Paint
b) Paper
c) Ink
d) Gun powder
Explanation: Wood is the main raw material for the manufacture of paper.
93. Rayon is chemically a
a) Cellulose
b) Pectin
c) Glucose
d) Amylase
Explanation: Rayon is chemically labelled cellulose acetate, which is a polymer of a semi-synthetic type. It is called semi-synthetic because it has a natural cellulose portion that in combination with acetate gives cellulose acetate (rayon).
94. Optical fibers are mainly used for which of the following?
a) Musical instruments
b) Food industry
c) Weaving
d) Communication
Explanation: Optical fibers are used most often as a means to transmit light between the two ends of the fiber and find wide usage in fiber-optic communications, where they permit transmission over longer distances and at higher bandwidths (data transfer rates) than electrical cables.
95. The major ingredient of leather is:
a) Collagen
b) Carbohydrate
c) Polymer
d) Nucleic acid
Explanation: Leather is a durable and flexible material created by tanning animal rawhide and skins. The major ingredient of leather is Collagen.
96. Which of the following shows the masses of the three elementary particles in decreasing order?
a) Leptons, Baryons, Mesons
b) Mesons, Baryons, Leptons
c) Baryons, Mesons, Leptons
d) Leptons, Mesons Baryons
Explanation: Baryons, Mesons, Leptons shows the masses of the three elementary particles in decreasing order.
97. What is the wavelength of visible spectrum?
a) 8500 - 9800 angstrom
b) 7800 - 8000 angstrom
c) 3900 - 7600 angstrom
d) 1300 - 3000 angstrom
Explanation: 3900 - 7600 angstrom is the wavelength of visible spectrum
98. Which of the following has a least penetrating power?
a) All have same penetrating power
b) Beta Particles
c) Alpha particles
d) Gamma rays
Explanation: Alpha is the least penetrating, while gamma is the most penetrating. Radiation can be harmful, but it can also be useful.
99. The isotope of uranium capable of sustaining chain reaction is
a) U-235
b) U-245
c) U-239
d) U-238
Explanation: The isotope of uranium capable of sustaining chain reaction is U-235.
100. The age of most ancient geological formations is estimated by
a) Ra - Si method
b) Potassium - argon method
c) C14 method
d) Uranium - lead method
Explanation: The Uranium Lead Method, also known as the U-Pb method, is one of the most ancient and reliable radiometric dating methods. It is used to date rocks and crystals that were formed more than a billion years ago. It has a range of dating samples that are about 1billion to 4.5billion years old. It has a precision rate of 0.1−1 percent.