Building Materials test on “Fire Resisting Materials “.
1. ________________ gas hampers oxygen from reaching the brain.
a) Carbon dioxide
b) Carbon monoxide
c) Nitrogen peroxide
d) Hydrogen
Answer: b
Clarification: Carbon monoxide is the most abundant of fires gases. It is invisible and odourless. Nitrogen dioxide is extremely toxic and it numbs or deadens the throat.
2. ____________________ gas overestimates the rate of breathing and it is thus responsible for increasing the intake of other toxic gases.
a) Hydrogen sulphide
b) Carbon monoxide
c) Carbon dioxide
d) Nitrogen dioxide
Answer: c
Clarification: Whereas, Hydrogen sulphide effects the nervous system and it causes dizziness and pain in the respiratory system. Also, nitrogen dioxide is extremely toxic and it numbs or deadens the throat.
3. During fire, the human body can withstand temperature upto __________
a) 150°C
b) 120°C
c) 200°C
d) 80°C
Answer: b
Clarification: If escape from a tall building is not affected within 10 minutes or 15 minutes of the outbreak of fire, the temperatures as high as 800°C and dense poisonous smoke can fatally trap the people within the building. It is estimated that nearly 15000 people are killed by fire every year in our country.
4. The content of oxygen is normally ________% in air.
a) 100
b) 50
c) 73
d) 21
Answer: d
Clarification: If the oxygen content falls below 17% during a fire, rational thought and muscle control become extremely difficult. When the oxygen level falls below 6%, the breathing stops and after 4 minutes to 6 minutes without oxygen the brain death occurs.
5. The hazard due to fire spread into a building through the open air is known as__________
a) Windward hazard
b) Internal hazard
c) Exposure hazard
d) Personal hazard
Answer: c
Clarification: Sometimes a fire spreads into a building through the open air from fire in other adjacent buildings or from across the road or other divisions of the same building. The risks involved in such fire spreading is known as the Exposure Hazard.
6. The hazard with concerns damage or destruction of building itself is known as the ______________
a) Internal hazard
b) Building hazard
c) Surrounding hazard
d) Personal hazard
Answer: a
Clarification: Internal Hazard concerns damage or destruction of the building itself and it is directly related to the fire load which, in turn, enables the building to be graded when considered along with the duration of fire.
7. The hazard which concerns with the loss or damage to life is referred to as the ______________
a) Peron hazard
b) People Hazard
c) Personal hazard
d) Internal hazard
Answer: c
Clarification: The possibility of loss or damage to life is referred to as the personal hazard and naturally it is not permanent importance. The fire safety provisions would be liberally provided for this type of hazard and safe fireproof exist should be suitably accommodated in the division of the building having more than one storey.
8. The term _____________ is used to indicate the amount of heat liberated in kilojoules per square metre of floor area of any compartment by the combustion of the content of the building and any combustible part of the building itself.
a) Combustion
b) Fire load
c) Calorific value
d) Heat liberation