GK Questions: General Science(Chemistry) – Set 7

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1. Battery is an arrangement of one or more cells connected in …………………
   1.Series
   2.Parallel
   3.Both 1 and 2
   4.a fixed manner
   5.None of these
   
   Answer & Explanation

   Answer – 1. Series
   Explanation :
   An electric battery is a device consisting of two or more electrochemical cells connected in series that convert stored chemical energy into electrical energy
   
   
   
2. Rechargeable batteries are called as …………………..
   1.Primary batteries
   2.Secondary batteries
   3.Fuel cell
   4.Electrochemical cell
   5.None of these
   
   Answer & Explanation

   Answer – 2.Secondary batteries
   Explanation :
   A secondary battery is a portable voltaic cell that is rechargeable.Ex – Lead storage battery
   
   
   
3. Which of the following is an example of primary batteries ?
   1.Nickel-Cadmium battery
   2.Lead storage battery
   3.Dry cell
   4.All of these
   5.None of these
   
   Answer & Explanation

   Answer – 3.Dry cell
   Explanation :
   A primary battery is a portable voltaic cell that is not rechargeable. Ex- Dry cell
   
   
   
4. Carbon is a member of group ……………….. in the periodic table.
   1.5
   2.8
   3.11
   4.14
   5.None of these
   
   Answer & Explanation

   Answer – 4.14
   Explanation :
   Carbon is a member of group 14 in the periodic table.
   
   
   
5. ………………………….. is a process in metallurgy in which a sulfide ore is heated in air
   1.Oxidation
   2.Rosting
   3.Rusting
   4.Reduction
   5.None of these
   
   Answer & Explanation

   Answer – 2.Rosting
   Explanation :
   Roasting is a process in metallurgy in which a sulfide ore is heated in air.The process may convert a metal sulfide to a metal oxide or to a free metal. Example:Roasting ZnS may yield ZnO
   
   
   
6. ……………….. converts into poisonous when exposed to sunlight
   1.C₃H₈O₃
   2.CHCl₃
   3.HCOOH
   4.C₆H₅OH
   5.None of these
   
   Answer & Explanation

   Answer – 2.CHCl₃      
   Explanation :   
   Cholroform converts into poisonous when exposed to sunlight. So it is kept in dark bottles
   
   
   
7. Which is used to manufacture printer ink ?
   1.Methane
   2.Benzene
   3.Glycol
   4.Ethylene
   5.None of these
   
   Answer & Explanation

   Answer – 1.Methane
   Explanation :
   Methane molecule consists of one carbon and four hydrogen atoms (CH₄). It is used to manufacture printer ink
   
   
   
8. Calorific Value of Petrol and diesel is ……………
   1.55,45
   2.40,50
   3.40,30
   4.50,40
   5.None of these
   
   Answer & Explanation

   Answer – 4.50,40
   Explanation :
   The calorific value of a fuel is the quantity of heat produced by its combustion.
   Petrol – 50
   Diesel – 40
   
   
   
9. ……………….. are sodium and potassium salts of higher fatty acids
   1.Fertilizers
   2.Detergents
   3.Soaps
   4.Glass
   5.None of these
   
   Answer & Explanation

   Answer – 3.Soaps
   Explanation :
   Soaps are made from fats and oils or their fatty acids.In general, fats/oils from plant origin are high in unsaturated and low in saturated fatty acids. Fats/oils from animal
   
   
   
10. Bituminous coal contain ……………………… of Carbon
    1.50%
    2.80%
    3.70%
    4.60%
    5.None of these
    
    Answer & Explanation

    Answer – 2.80%
    Explanation :
    Bituminous coal(80% C)or black coal is a relatively softcoal  containing a tarlike substance calledbitumen. It is of higher quality than lignite coal but of poorer quality than anthracite.