VIII(8th) Combustion and flame MCQ

Combustion and flame class 8th  MCQ (Multiple Choice Questions)
1.      Name the compound present in the head of match stick.
a) Antimony disulphide b) Potassium chlorate and antimony trisulphide
c) White phosphorous and potassium chlorate
d) Red phosphorous and potassium chlorate
2.      Which one does not burn with a flame?
a) Candle            b) Coal                        c) Kerosene oil            d) Molten wax
3.      A chemical process in which a substance reacts with oxygen to give off heat is_______.
a) Photosynthesis           b) Respiration              c) Combustion             d) Transpiration
4.      In the Sun, heat and light are produced by___________________.
a) Combustion    b) Explosion    c) Nuclear reaction      d) Conduction
5.      Magnesium burns in air to produce_________.
a) Mg(OH)2      b) MgO      c) MgO2       d) MgCO3
6.      Inflammable substances have:
a) high ignition temperature       b) low ignition temperature     c) no ignition temperature     d) high boiling point.
7.      Choose the best fire extinguisher.
a) Oxygen          b) Water          c) Carbon dioxide       d) Blanket
8.      The hottest part of a candle flame:
a) luminous zone            b) dark zone    c) hot zone      d) non-luminous zone.
9.      The colour of middle zone of the candle flame is:
a) Orange           b) Black           c) Yellow        d) Blue
10.  Complete combustion of wax vapours takes place in____________.
a) middle zone   b) luminous zone         c) non-luminous zone              d) dark zone
11.  The calorific value of wood when compared to LPG is:
a) less     b) more            c) same            d) no colorific value
12.  The unit of calorific value is:
a) kJ/kg               b) kg/kJ           c) kB/kJ           d) g/kJ
13.  Global warming is a result of:
a) increased O2   b) increased CO2         c) increased water vapour       d) increased CO
14.  A very poisonous gas:
a) Carbon dioxide          b) Nitrogen      c) Carbon monoxide   d) Oxygen
15.  A cleaner fuel for automobiles:
a) Petrol              b) Diesel          c) CNG           d) LPG
16.  This can not be used for fires involving electrical equipments:
a) Carbon dioxide       b) Oxygen       c) Water d) Fire extinguisher
17.        A liquid fuel used in homes:
a) water              b) LPG                        c) CNG           d) cooking oil
18.  Carbon monoxide is produced by:
a) incomplete combustion of fuels         b) explosion of fuels
c) complete combustion of fuels            d) sleeping in a closed room
19.  Sources of heat energy for domestic and industrial purposes are:
a) Matchstick     b) fuel              c) petrol           d) heater
20.  For melting gold and silver, a gold smith uses:
a) inner most zone of a flame     b) the least hot region
c) non-luminous zone               d) dark zone
21.  The zone of partial combustion is___________.
a) luminous zone            b) innermost zone        c) dark zone    d) non-luminous zone
22.  Use of Diesel and Petrol as fuel in automobiles is being replaced by:
a) LPG   b) CNG           c) Coal             d) Bitumen
23.  When an electrical equipment is on fire, the best extinguisher to be used is:
a) water              b) sunlight       c) CO2             d) O2
24.  What is the telephone number of fire service in Saudi Arabia?
a) 997                 b) 998              c) 999              d) 993
25.  When compared to wood the ignition temperature of kerosene oil is:
a) higher             b) lower           c) the same      d) no ignition temperature
1.  b 2.  b 3.              c 4.  c 5.  b 6.  b 7.  c 8.  d 9.  c 10.    c 11.    b	12.     a 13.    b 14.    c 15.    c 16.    c 17.    b 18.    a 19.    c 20.    c 21.    a 22.    b 23.    c 24.    b 25.    b

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