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251.

The sparkling of a diamond is due to 1). total internal reflection of light 2). interference of light 3). polarisation of light4). refraction of light

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252.

When the barometer reading dips suddenly it is an indication of1).Hot weather2).Calm weather3).Storm 4). Dry weather

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When the barometer READING dips SUDDENLY, it is an INDICATION of storm.

So, the CORRECT option is 3). Storm 

253.

Should cars have bumpers that collapse under impact? 1). Yes since the offending car should get damaged and pay for the mistake2).No since it would be very expensive to get the car repaired3).No since the colliding car would then ram into the occupants and kill them4).Yes since they help to absorb the impact of a collision and keep the occupants safe

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254.

SHOCK ABSORBERS are usually made of steel because :1). is not brittle2). has lower elasticity 3). has higher elasticity 4). has no ductile property

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255.

Ventilators are provided near the ceiling of the room because1). the exhaled warmer air rises up and goes out 2). these provide cross ventilation in the room 3). these provide some sunlight in the room 4). these do not look nice in the lower part

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VENTILATORS are provided near the ceiling of the rooms in our houses because the AIR we breathe out is warm and the warm air being less dense than COLD air,rises and go out through the ventilators. 

So, the correct OPTION is,

1). The exhaled warmer air rises up and GOES out.

256.

Myopia is the same as 1). Near sightedness 2). Astigmatism 3). Presbyopia 4). Long sightedness

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257.

The distance between node and adjacent antinodes is 30 cm. The wavelength is1).30 cm.2).90 cm3).120 cm.4).60 cm.

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258.

The term Isoneph indicates the lines of equal1).cloudiness2).salinity3).rainfall4).pressure

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259.

Which among the following metals provides atmospheric oxide?1). Sodium2). Silver3). Aluminium4). Calcium

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260.

The fundamental particles present in the nucleus of an atom are1). Electron proton2). Proton neutron3). Neutron electron4). Neutron positron

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261.

Cement is usually a mixture of1). Calcium silicate and calcium aluminate2). Calcium silicate and calcium ferrate.3). Calcium aluminate and calcium ferrate4). Lime stone and silicon dioxide

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262.

The amount of chlorine available in water after disinfection is: called as1). free chlorine2). residual chlorine3). free available chlorine4). combined available chlorine

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263.

Sour milk contains1). acetic acid2). tartaric acid3). citric acid4). lactic acid

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264.

Dry ice is1). solid ammonia2). solid sulphur dioxide3). dry carbon dioxide gas4). solid carbon dioxide

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265.

Which one of the following minerals is found in Mona2ite sand ?1). Potassium2). Uranium3). Thorium4). Sodium

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266.

Who developed atom bomb ?1). Warner Wan Brown2). J. Robert Open heimer3). Edward Taylor4). Samuel Koehen

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267.

92 Which of the following chemical materials is responsible for the depletion of ozone layer in the atmosphere ?1). Nitrous oxide2). Carbon dioxide3). Chlorofluorocarbon4). Sulphur dioxide

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268.

Wood spirit is1). Methyl alcohol2). Ethyl alcohol3). Butyl alcohol4). Propyl alcohol

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269.

An electric iron has a heating element made of:1). Copper2). Tungsten3). Nichrome4). Zinc Technical

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270.

Which one of the following organic compounds has fruity smell?1). Alcohol2). Aldehyde3). Ester4). Ether

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271.

Which one of the following is extensively used for sterilizing water ?1). Bleaching powder2). Alum3). Borax powder4). Soda powder

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272.

The fiber least prone to catch fire is1). nylon2). (b)(2 ) polyester3). cotton4). terylene

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273.

Aspirin is chemically known as1). methyl salicylate2). hydroxysalicylate3). acetylsalicyclic acid4). alkylsalicylic acid

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274.

Oxygen which is vital for life is a product of photosynthesis and conies from1). carbonates from soil2). carbon dioxide3). water4). oxides of mineral elements

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275.

Ultraviolet radiation striking this earth is due to the depletion of1). carbon monoxide2). carbon dioxide3). ozone4). oxygen

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276.

Which of the following is a supercooled liquid?1). Icecream2). Ammonia3). Glass4). Wood

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277.

Cement is made hard with1). dehydration2). hydration and dissociation of water3). Dissociation of water4). Polymerisation

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278.

The resources which can be used continuously year after year ate called1). Biotic2). Abiotic3). Nonrenewable4). Renewable

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279.

Aspirin is1). Methoxy benzoic acid2). Methyl Salicilate3). Acetyl Salicillc acid4). Phenyl Salicilate

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280.

The phenomenon of light associated with the appearance of blue colour of the sky is 1). Interference2). Reflection 3). Refraction 4). Scattering

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281.

Which of the following is used to iodine common salt?1). Potassium iodide2). Iodine3). Potassium iodide4). Sodium iodide

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282.

Zinc sulphide is commonly used as1). fungicide2). herbidide3). rodenticide4). deodorant

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283.

Which one of the following pairs is NOT correctly matched?1). Haematite: Copper2). Bauxite: Aluminium3). Monazite: Thorium4). Pitchblende : Uranium

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284.

The gas used in the artificial ripening of fruits is1). Acetylene2). Methane3). Ethane4). Butane

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285.

Lens is made up of1).Pyrex glass2).Flint glass 3). Ordinary glass 4). Cobalt glass

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286.

Which of the following is used to remove rust stains on cloth?1). Kerosene2). Lime3). Oxalic acid solution4). Petrol

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287.

Which of the following metals causes ItaiItal disease ?1). Cadmium2). Chromium3). Cobalt4). Copper

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288.

Vulcanization of rubber is carried out by adding1). Sulphur2). Carbon3). Ozone4). Phosphorus

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289.

The chemical bahaviour of an atom depends upon1). the number of protons in its nucleus2). the number of neutrons in the nucleus3). the number of electrons orbiting around the nucleus4). the number of nucleons in the nucleus

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290.

In addition to hydrogen the other abundant element present on Suns surface is1). Helium2). Neon3). Argon4). Oxygen

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291.

Baking soda is1). Potassium carbonate2). Sodium hydroxide3). Sodium carbonate4). Sodium bicarbonate

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292.

Which of the following is a monoatomic gas?1). Oxygen2). Neon3). Nitrogen4). Fluorine

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293.

Byproduct obtained by soap industry is1). Caustic soda2). Glycerol3). Naphthalene4). Caustic potash

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294.

Which of the following circuit elements is used to block DC in an electronic circuit ?1). Resistances 2). Capacitance 3). Inductance 4). Diode

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295.

Which one of the following is used as preservative for foodstuff ?1). Sodium Benzoate2). Picric acid3). Glycerine4). Sodium Chloride

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296.

Which one of the following is a microelement?1). Chlorine2). Hydrogen3). Nitrogen4). Oxygen

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297.

The BOD values of water indicate the1). amount of organic debris2). amount of oxygen used for biochemical oxidation3). amount of oxygen used for biochemical reduction4). amount of ozone used for biochemical oxidation

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298.

Energy in reflected light :1). does not depends on the angle of incidence 2). increases with the increase in angle 3). decreases with the increase in angle of incidence4). becomes maximum for angle of incidence equal to 45 degree

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299.

This group of alumino silicate minerals is widely used In making electrical insulators1). Bauxite2). Chromite3). Manganese4). Mica

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