These questions are very useful for OSSSC Grade-C( Statistical field surveyor, Forest Guard,ARI,Amin)SSC CHSL MTS,SI, RAILWAY, BANKING etc.
Top 60 Chemistry Previous Year Osssc grade-c,MTS Questions
Asked in osssc grade-c(statistical field surveyor,ari,amin, forest guard) SSC MTS Exams
Q.1) What is "Milk of magnesia" chemically ?
(A) Magnesium carbonate
(B) Sodium bicarbonate
(C) Calcium hydroxide
(D) Magnesium hydroxide
Correct Answer (D) Magnesium hydroxide
Q.2) A body moving in a circular path with a constant speed has a -
(A) constant velocity
(B) constant acceleration
(C) constant kinetic energy
(D) constant displacement
Correct Answer-(C) constant kinetic energy
Q.3) The important ore of aluminium is-
(A) cryolite
(B) bauxite
(C) fluorspar
(D) haematite
Correct Answer-(B) bauxite
Q.4) Which of the following is not present in German-silver?
(A) Copper
(B) Nickel
(C) Silver
(D) Zinc
Correct Answer-(C) Silver
Q.5) Potassium Permanganate is used for purifying drinking water, because-
(A) it dissolves the impurities of water
(B) It is a sterlizing agent
(C) It is an oxidising agent
(D) It is a reducing agent
Correct Answer -(C) It is an oxidising agent
Q.6) The major harmful gas emitted by automobile vehicles which causes air pollution is-
(A) Carbon Monoxide
(B) Methane
(C) Carbon dioxide
(D) Ozone gas
Correct Answer-(A) Carbon Monoxide
Q.7) Who discovered the atom bomb ?
(A) Madam Curie
(B) Pierre Curie
(C) Otto Hahn
(D) Albert Einstein
Correct Answer-(C) Otto Hahn
Q.8) Diamond is harder than graphite because of
(A) difference in layers of atoms
(B) tetrahedral structure of diamond
(C) different of crystalline structures
(D) None of these
Correct Answer-(A) difference in layers of atoms
Q.9) The major component of honey is-
(A) glucose
(B) sucrose
(C) maltose
(D) fructose
Correct Answer -(D) fructose
Q.10) The ratio of pure gold in 18 carat gold is
(A) 60%
(B) 75%
(C) 80%
(D) 90%
Correct Answer-(B) 75%
Q.11) ______ is the process in which acids and bases react to form salt and water .
(A) Neutralization
(B) Distillation
(C) Electrolysis
(D) Hydrolysis
Correct Answer-(A) Neutralization
Q.12) Milk tastes sour when kept in the open for sometimes due to the formation of
(A) lactic acid
(B) citric acid
(C) acetic acid
(D) carbonic acid
Correct Answer-(A) lactic acid
Q.13) Which of the following is a natural dye?
(A) Crystal violet
(B) Aniline blue
(C) Alizarin
(D) Phenolphthalein
Correct Answer-(C) Alizarin
Q.14) Which is the purest form of iron ?
(A) Steel
(B) Cast iron
(C) Pig iron
(D) Wrought iron
Correct Answer-(4) Wrought iron
Q.15) Electromagnet is constructed with which of the following ?
(A) Steel
(B) Soft Iron
(C) Aluminium
(D) Nickel
Correct Answer-(2) Soft Iron
Q.16) What are the major pollutants of cigarettes smoke ?
(A) Carbon monoxide and dioxin
(B) Carbon monoxide and nicotine
(C) Carbon monoxide and benzene
(D) Dioxin and benzene
Correct Answer-(B) Carbon monoxide and nicotine
Q.17) Which of the following metals form an amalgam With other metals?
(A) Lead
(B) Tin
(C) Zinc
(D) Mercury
Correct Answer-(D) Mercury
Q.18) Candle is a mixture of-
(A) Paraffin wax and stearic acid
(B) Bees wax and stearic acid
(C) Higher fat acids and stearic acid
(D) Bees wax and paraffin wax
Correct Answer-(A) Paraffin wax and stearic acid
Q.19) Petroleum is a mixture of-
(A) elements
(B) hydrocarbons
(C) polymers
(D) salts
Correct Answer-(B) hydrocarbons
Q.20) The gas used for filling weather balloons is -
(A) helium
(B) hydrogen
(C) air
(D) nitrogen
Correct Answer-(A) helium
Q.21) German silver, an alloy, does not contain the metal-
(A) Nickel
(B) Copper
(C) Zinc
(D) Silver
Correct Answer-(D) Silver
Q.22) An emulsion is a colloid of a -
(A) gas in a liquid
(A) liquid in a gas
(C) liquid in a liquid
(D) gas in a solid
Correct Answer-(C) liquid in a liquid
Q.23) Oxygen which is vital for life is a product of photosynthesis and comes from
(A) carbonates from soil
(B) carbon dioxide
(C) water
(D) oxides of mineral elements
Correct Answer-(C) water
Q.24) Percentage of carbon in steel ranges from
(A) 0.1 to 1.5
(B) 1.5 to 3.0
(C) 3.0 to 4.0
(D) 4.0 to 6.0
Correct Answer-(A) 0.1 to 1.5
Q.25) What is the purpose of adding baking soda to dough ?
(A) To generate moisture
(B) To give a good flavour
(C) To give good colour
(D) To generate carbon dioxide
Correct Answer- (D) To generate carbon dioxide
Q.26) Which of the following gases makes bread or cake rise making them soft and spongy?
(A) CO
(B) H2
(C) CO2
(D) O2
Correct Answer-(C) CO2
Q.27) The chemical name of 'Common salt'
(A) Sodium Chloride
(B) Sodium Nitrate
(C) Aluminium Chloride
(D) Aluminium Nitrate
Correct Answer- (A) Sodium Chloride
Q.28) Which one of the following is a cation ?
(A) Carbonate
(B) Nitrite
(C) Ammonium
(D) Hydroxide
Correct Answer-(C) Ammonium
Q.29) Which one amongst the following is not a Green House gas ?
(1) Nitrogen
(3) Carbon Monoxide
(4) Chloro fluoro
(2) Carbon dioxide
Correct Answer-(1) Nitrogen
Q.30) Gobar gas mainly contains -
(A) Carbon dioxide
(B) Carbon monoxide
(C) Hydrogen sulphide
(D) Methane
Correct Answer-(D) Methane
Q.31) The element used in the manufacture of safety matches is-
(A) Phosphorous
(B) Magnesium
(C) Silicon
(D) Sulphur
Correct Answer-(A) Phosphorous
Q.32) The chief constituent of vinegar is-
(A) Formic acid
(B) Acetic acid
(C) Salycylic acid
(D) Oxalic acid
Correct Answer-(B) Acetic acid
Q.33) The main source of Naphthalene is-
(A) Charcoal
(B) Camphor
(C) Coal-tar
(D) Diesel
Correct Answer-(C) Coal-tar
Q.34) Commercial Vaseline is derived from-
(A) plant gums
(B) coal tar
(C) wool wax
(D) petroleum
Correct Answer-(4) petroleum
Q.35) The material used in solar cells contains
(A) Tin
(2) Silicon
(3) Caesium
(4) Thallium
Correct Answer-(2) Silicon
Q.36) Colour imparted to the Bunsen flame by strontium salt is-
(A) bluish green
(B) apple-green
(C) brick red
(D) crimson red
Correct Answer-(D) crimson red
Q.37) Name the particle that is most essential to continue the chain reaction during the fission of uranium
(A) Electron
(B) Proton
(C) Neutron
(D) Positron
Correct Answer-(C) Neutron
Q.38) Quartz is a crystalline form of
(A) Alumina
(B) Glass
(C) Silica
(D) Limestone
Correct Answer-(C) Silica
Q.39) Name the particle that is most essential to continue the chain reaction during the fission of uranium -
(A) Electron
(B) Proton
(C) Neutron
(D) Positron
Correct Answer-(C) Neutron
Q.40) In vulcanization process, rubber can be hardened by adding -
(A) Nitrogen
(B) Silicon
(C) Sulphur
(D) Alcohol
Correct Answer -(C) Sulphur
Q.41) By-product obtained by soap industry
(A) Caustic Soda
(B) Glycerol
(C) Naphthalene
(D) Caustic Patas
Correct Answer -(B) Glycerol
Q.42) Ginger is an example of-
(A) Modified Node
(B) Modified Root
(C) Modified Stem
(D) Tap Root
Correct Answer (C) Modified Stem
Q.43) Polythene is polymer of-
(A) Ethylene
(B) Propylene
(C) Acetylene
(D) Aniline
Correct Answer-(A) Ethylene
Q.44) The ore which is found in abundance in India is-
(A) monazite
(B) bauxite
(C) magnetite
(D) fluorspar
Correct Answer- (A) monazite
Q.45) Which one is not micronutrient ?
(A) Iron
(B) Zinc
(C) Sulphur
(D) Manganese
Correct Answer (C) Sulphur
Q.46) Baryllium Sulphate is less soluble in water due to-
(1) High inflammable energy
(2) Low Energy of dissociation
(C) Low inflammable energy
(D) Ionic Band
Correct Answer-(1) High inflammable energy
Q.47) Who suggested that the most of the mass of atom is located in nucleus ?
(A) Bohr
(B) Thomson
(C) Rutherford
(D) Avogadro
Correct Answer -(C) Rutherford
Q.48) The pH of a neutral solution is-
(A) 0-7
(B) 7-14
(C)7
(D) None of these
Correct Answer - (C) 7
Q.49) Urea is a-
(A) Sodium fertilizer
(B) Phosphatic fertilizer
(C) Nitrogenous fertilizer
(D) Potassium fertilizer
Correct Answer-(C) Nitrogenous fertilizer
Q.50) The nucleus of an atom consists of -
(A) electrons and neutrons
(B) electrons and protons
(C) protons and neutrons
(D) All of the above
Correct Answer -(C) protons and neutrons
Q.51) During inter conversion of energy from one form to other forms, total energy at any time remains-
(A) constant
(B) zero
(3) increasing
(4) decreasing
Correct Answer - (A) constant
Q.52) Detergents are
(A) Sodium salts of fatty acids
(B) Sodium salts of sulphonic acids
(C) Sodium salt of benzoic acid
(D) None of the above
Correct Answer-(B) Sodium salts of sulphonic acids
Q.53) Which of the following is a physical changer
(1) oxidation
(2) reduction
(3) sublimation
(4) decomposition
Correct Answer-(3) sublimation
Q.54) Sea weeds are important source of
(A) iron
(B) chlorine
(C) bromine
(D) iodine
Correct Answer-(D) iodine
Q.55) Which gas is used to manufacture vanaspati from vegetable oil is-
(A) Carbon Dioxide
(B) Nitrogen
(C) Oxygen
(D) Hydrogen
Correct Answer -(D) Hydrogen
Q.56) Ethanol containing 5% water is known as -
(A) rectified spirit
(B) denatured spirit
(C) methylated alcohol
(D) power alcohol
Correct Answer -(A) rectified spirit
Q.57) The important ore of aluminium is -
(A) bauxite
(B) cryolite
(C) fluorspar
(D) haematite
Correct Answer-(A) bauxite
Q.58) Conversion of chemical energy into electrical energy occurs in-
(A) Atomic bombs
(B) Dynamo
(C) A battery
(D) Electric heaters
Correct Answer-(C) A battery
Q.59) 'Red Ink' is prepared from-
(A) Phenol
(B) Aniline
(C) Kango Redd
(D) Eosin
Correct Answer -(D) Eosin
Q.60) Oil of vitriol is -
(A) Nitric acid
(B) Sulphuric acid
(C) Hydrochloric acid
(D) Phosphoric acid
Correct Answer - (B) Sulphuric acid
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