𝐈𝐌𝐏𝐎𝐑𝐓𝐀𝐍𝐓 𝐂𝐇𝐄𝐌𝐈𝐒𝐓𝐑𝐘 𝐐𝐔𝐄𝐒𝐓𝐈𝐎𝐍𝐒

𝐂𝐇𝐄𝐌𝐈𝐒𝐓𝐑𝐘

Q1) What is used in nuclear reactor as a moderator. It is also known as Heavy Water?

Ans -: Deuterium Oxide (D2O)

Q2) Which Metal is in liquid state at room temperature?

Ans -: Gallium

Q3) _______elements are non-metal.

Ans -: Electro-negative

Q4) What is known as Artificial Silk.

Ans -: Rayon

Q5) Nitrous Oxide (N2O) is also known as –

Ans -: Laughing Gas

Q6) Which compound is used to prepare water proof clothes?

Ans -: Calcium hydride

Q7) Which Nobel Gas is also known as ‘Stranger Gas’?

Ans -: Xenon

Q8) Which Acid is know as ‘Oil of Vitriol’?

Ans -: Sulphuric acid

Q9) For making of parachute, which polymeric substance used?

Ans -: Viscose

Q10) Acid rain is caused when the air is polluted by _________Gases.

Ans -: Nitrous Oxide & Sulphur dioxide

Q11) All noble gases are ______& ______. 

Ans -: Colourless and Odourless

Q12) _______is used as a Water Purifier. 

Ans -: Alum

Q13) Aluminium is extracted from which ore? 

Ans -: Bauxite

Q14) The _________Process is used to synthesized Ammonia (NH3)? 

Ans -: Haber’s Process

Q15) Which compound/acid commonly known as Aspirin? 

Ans -: Acetylsalicylic Acid

Q16)________gas used to fill Balloons. 

Ans -: Helium

Q17)________ is also known as Baryta Water? 

Ans -: Barium Hydroxide

Q18) Best sources for Vitamin D are –

Ans -: Sunlight & Fish liver

Q19) Which gas is the chief component of Bio-gas? 

Ans -: Methane

Q20) _________is the purest form of Carbon found in Nature. 

Ans -: Diamond

Q21) The Chemical name of ‘Washing Soda’ is –

Ans -: Sodium Carbonate

Q22) What is the Chemical name of Chromic Acid? 

Ans -: Chromium trioxide

Q23) Chemical name of Picric Acid is –

Ans -: Tri Nitro Phenol

Q24) In Photography, which chemical used as a fixer. 

Ans -: Sodium thiosulphate

Q25) What are used to control the chain reaction in a nuclear reactor? 

Ans -: Cadmium rods

Q26) In sunlight, Chloroform is converted into______ , a poisonous gas.

Ans -: Phosgene

Q27) Which Vitamin contains Cobalt? 

Ans -: Vitamin B12

Q28)_______ is one of the most common preservatives used in food processing industry? 

Ans -: Benzoic Acid

Q29) Which compounds are responsible for permanent hardness of water? 

Ans -: Sulphates and Chlorides of Calcium and Magnesium

Q30) The temporary hardness of water is caused of because of which compounds? 

Ans -: Bicarbonates of Calcium and Magnesium

Q31) Copper is extracted from which ore? 

Ans -: Copper Pyrite

Q32) When there is_______ , Dead organisms are transformed into petroleum and natural 

gas.

Ans -: Absence of air

Q33) Deuterium is _______of Hydrogen.

Ans -: Isotope

Q34) the weight of iron is_______ , when it is undergoing the process of ‘rusting’.

Ans -: Increases

Q35) Efficiency of the catalyst depends on its –

Ans -: Molecular State

Q36) Egg shell is made up of______ . 

Ans -: Calcium Carbonate

Q37) Which Vitamins are Fat Soluble? 

Ans -: A, D, E & K

Q38) Which was the First organic compound synthesized in a lab and it was done by whom? 

Ans -: Urea by Friedrich Wöhler

Q39) Fuse wire is made up of_________ . 

Ans -: Lead and Tin

Q40)________ is used to coat Galvanised Iron. 

Ans -: Zinc

Q41. Which Gases are used by sea divers for under water breathing? 

Ans -: Oxygen & Helium

Q42._____ &______ gases are helpful for ripening of raw fruits. 

Ans -: Ethylene & Acetylene

Q43. The_______ found in an ore is known as Gangue. 

Ans -: Impurities

Q44. Iron is extracted from which ore? 

Ans -: Hematite

Q45. Kerosene is a mixture of ______. 

Ans -: Aliphatic hydrocarbons

Q46. Which Element is used for making of Lead pencil. 

Ans -: Graphite

Q47. The lightest metal is ________. 

Ans -: Lithium

Q48. ________is the main ore of Mercury. 

Ans -: Cinnabar

Q49. Which Metal is found in the highest proportion in earth’s crust? 

Ans -: Aluminium

Q50. Mine explosions are mostly caused by mixing of Air & _________. 

Ans -: Methane

Q51. What is the compound used to in Nail polish remover? 

Ans -: Acetone

Q52. Natural rubber is a polymer derived from______ . 

Ans -: Isoprene

Q53. The coating on non-stick cookware is of________ . 

Ans -: polytetrafluoroethylene (PTFE) – TEFLON

Q54. The Nuclear Fusion on the Sun’s surface result into formation of________ Atoms. 

Ans -: Helium

Q55. Organic Compounds are only soluble in _______. 

Ans -: Non-polar solvents

Q56.__________ is also know as “FOOL’S GOLD”. 

Ans -: Iron Pyrite

Q57. In an Oxidation process________ happens. 

Ans -: Loss of electrons

Q58. Oxides of metals are_______ . 

Ans -: Alkaline

Q59. Ozone is _________in nature. 

Ans -: Diamagnetic

Q60. The chemical composition of paper is that of a_________ . 

Ans -: Cellulose

Q61) Permanent magnets are made of ________. 

Ans -: Steel

Q62) During a fog, the visibility is reduced. This is because of which phenomenon? 

Ans -: Scattering of light

Q63) Weightlessness experienced in a spaceship is due to ________. 

Ans -: Absence of Gravity

Q64) Which device is used to find submerged objects? 

Ans -: SONAR

Q65) What converts the alternating current into direct current? 

Ans -: Rectifier

Q66) Which element is used as a moderator in nuclear reactors? 

Ans -: Graphite

Q67) Which device converts light energy into electric energy? 

Ans -: Photoelectric cell

Q68) The unit of power of lensis called _______. 

Ans -: Dioptre

Q69) What is the unit of Radioactivity? 

Ans -: Curie

Q70) An object has to attain the velocity of_________ to escape from earth’s atmosphere? 

Ans -: 11.2 km/sec

Q71) What is the measuring unit of length of light waves? 

Ans -: Angstrom

Q72) A short duration wave is known as –

Ans -: Pulse

Q73) When did Einstein propose that matter can be converted into energy? 

Ans -: 1905

Q74) What is the SI unit of luminous intensity? 

Ans -: Candela

Q75) What is the unit of magnetic flux? 

Ans -: Maxwell

Q76) What is the unit of specific resistance? 

Ans -: Ohm-metre

Q77) The wavelength of visible spectrum ranges from _______. 

Ans -: 390-700 nanometres

Q78) A Washing machine works on the principle of –

Ans -: Centrifugation

Q79) When a ball is thrown upward, what happens to its Acceleration? 

Ans -: It remains Constant

Q80) Magnifying glass is made of which type of lens? 

Ans -: Convex lens

Q81) What colour will a red glass appear if it is heated in dark room? 

Ans -: Green

Q82) What happens to the surface tension of the water when a detergent is added to it? 

Ans -: Decreases

Q83) The value of ‘g’ (acceleration due to gravity) is maximum at________ ? 

Ans -: at poles

Q84) Which instrument is used to measure altitudes in aircrafts? 

Ans -: Altimeter

Q85) Which instrument is used to measure change in volume of substances ? 

Ans -: Dilatometer

Q86) Which instrument is used to measure depth of ocean ? 

Ans -: Fathometer

Q87) The power of electric circuit is measured with a _______.

Ans -: Wattmeter

Q88) Which instrument is used to measure the scattering of light by particles suspended in a liquid

?

Ans -: Nephelometer

Q89) Which is more elastic – Steel or Rubber? 

Ans -: Steel

Q90) Which is the only natural magnet? 

Ans -: Magnetite

Q91) What Principle is used in the designing of ships and submarines? 

Ans -: Archimedes Principle

Q92) Nuclear Fissions are initiated by _______. 

Ans -: Neutrons

Q93) The wire in an electric heater is made up of_______ . 

Ans -: Nichrome

Q94) During Sonography which types of Waves are used? 

Ans -: Ultrasonic waves

Q95) Diode Bulb was discovered by ________. 

Ans -: Sir J. S. Fleming

Q96) Who gave the first experimental value of G? 

Ans -: Cavendish

Q97) Who had showed that the electric and magnetic waves are equal in vacuum? 

Ans -: James Clerk Maxwell

Q98) What is the escape velocity of Moon? 

Ans -: 2.38 Km/s

Q99) Why does a liquid drop tend to assume a spherical shape? 

Ans -: To minimize surface tension

Q100) Resistance of a Conductor is inversely proportionalto it’s_________ . 

Ans -: Cross Sectional Area