Q.19. An ideal fuel is cheap, readily available, easily combustible and easy to transport. It has a high calorific value. It does not produce gases or residues that pollute the environment. Based on the above statements which of the following is closest to being an ideal fuel

A. Compressed Natural Gas           (CNG)     B. Kerosene      C. Petrol      D. Coal

Q.20. When a cracker is ignited, a sudden reaction takes place with the evolution of heat, light and sound. Identify the type of combustion

A. Random combustion    B. Rapid combustion          C. Spontaneous combustion          D. Explosion

Q.21. The efficiency of a fuel is expressed in terms of its -

A. density  B. calorific value  C. volume                   D. purity

Q.22. The suspended particles released by the combustion of coal in the air may lead to a health disease. Select the correct option.

A. Goitre              B. Arthritis       C. Asthma              D. Bone cancer

Q. 23. The innermost zone of the candle flame is the

a. Hottest part b. Moderately hot part c. Least hot part d. Cold part

Q.24. Which is better domestic fuel :

a. CNG  b. LPG   c. Wood d. Coal

Q.25. The substances which have very low ignition temperatures will

a. Catch fire easily b. Will not catch fire c. Catch fire after some time. None of these

Q.26. Combustion is a-

a. Physical process b. Chemical process c. Both (a) and (b)                      d. None of these

Q.27. Like fuel, the sun also provides heat and light. The process taking place in the sun is called

a. Combustion b. Nuclear process c. Burning d. All of these

Q.28. CO2 extinguishers help extinguish fires by –

A. Cutting supply of nitrogen.                       B. Limiting the supply of fuel.

C. Reducing the heat of the surroundings.    D. Cutting the supply of oxygen

Q.29. Which of the following cannot be used to extinguish the fire caused by electricity

A. Carbon dioxide                        B. Blanket                    C. Sand                  D. Water

Q.30. Charcoal burns in the air producing-

a. CO2   b. CO c. H2        d.O2

Q.31. Which of the following is an inflammable substance

a. Petrol b. Wood     c. Paper     d. Straw

Q.32. Good fuel is

a. Readily available b. Cheap      c. Burn easily in air d. All of these

Q.33. Unburnt carbon particles causes

a. Stomach infection b. Respiratory problems  c. Brain infections d. Throat problems

34. Incomplete combustion gives

a. CO2   b. CO   c. Carbon d. None of these

Q. 35. Which of the following is/are carbon fuel

a. Wood b. Coal   c. Petroleum d. All of these

Q.36. Acid rain is caused by oxides of

a.Sulphur, Nitrogen b. Sulphur, Carbon

c. Carbon, Nitrogen d. Phosphorous, Carbon

Q.37. The head of the safety match contains

a. Antimony trisulphide b. Potassium Chlorate c. Both (a) and (b)               d. None of these

Q.38.Combustion of most fuels releases

a. CO2                     b. SO2                        c. NO2                          d. Oxygen

Q.39.Burning of coal and diesel releases

a. NO2                b. CO2                        c. SO2                       d. CO

Q.40. The burning of LPG is an example of

(a) rapid combustion    (b) spontaneous combustion

(c) slow combustion  (d) explosion

Q.41.The products of combustion are

a. Carbon dioxide and water b. Oxygen and water

c. Only carbon dioxide d. Only oxygen

Q.42. The most common fire extinguisher is

a. Water b. CO2  c. Oxygen d. Hydrogen

Q.43. Petrol engine gives off gaseous oxides of

a. Sulphur b. Nitrogen    c. Phosphorous d. Carbon

Q.44.Unburnt carbon particles causes

a.Stomach infections b.Respiratory problems     c.Brain infections d. Throat problems

Q.45. The temperature at which the substance burns is called

(a) melting      (b) boiling temperature    (c) kindling temperature   (d) evaporation

Q.46. When the match struck against a rubbing surface, red phosphorous

a. Converts into white phosphorous b. Reacts with potassium chlorate

c. Ignite antimony trisulphide d. None of these

Q. 47. The best extinguisher for inflammable Materials is

a. Water b. SO2                         c. CO2                     d. CO

Q.48. CO2 is stored as a liquid in the cylinder at

a. High-pressure b. Low-pressure c. High-temperature d. Low temperature

Q. 49. Water is not suitable for fires involving

a. Oil b. Petrol c. Both (a) and (b)                        d. None of these

Q.50. A substance that vaporizes during burning gives

a. Sound b. Flame c. Combustion d. None of these

Q. 51. Which is a solid fuel

a. Petrol b. Diesel                            c. Wax d. Wood

Q.52. Ideal fuel has ____ calorific value

a. Low b. High    c. Moderated. Zero

Q.53.The amount of heat energy produced on _____combustion of 1kg of fuel is the Calorific value

a. Incomplete b. Complete c. Half d. None of these

53(b). Global warming is caused due to____ concentration of CO2 in the air

a. Decreased b. Increased c. Both (a) and (b)  d. None of these