6060.Which one of the following is used as an explosive?
Phosphorus trichloride
Mercuric oxide
Graphite
Nitroglycerine
6066.Chemically, lime water is
Calcium hydroxide
Sodium carbonate
Sodium hydroxide
Calcium carbonate
6080.Evaporation from water surfaces exposed to air is not dependent of the
velocity of the wind
humidity
temperature
depth of the water
6087.What does airbag, used for safety of car driver, contain?
Sodium bicarbonate
Sodium azide
Sodium nitrite
Sodium peroxide
6092.Chlorination is a process used for water purification. The disinfecting action of chlorine is mainly due to
The formation of hydrochloric acid when chlorine is added to water.
The formation of hypochlorous acid when chlorine is added to water.
The formation of nascent oxygen when chlorine is added to water.
The formation of hydrogen when chlorine is added to water.
6093.Chemically, bleaching powder is
Calcium hypochlorite
Calcium hydroxide
Sodium hydroxide
Calcium sulphate
6097.Consider the following:
1. Oxides of Hydrogen
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above causes/cause acid rain?
1. Oxides of Hydrogen
2. Oxides of Nitrogen
3. Oxides of Sulphur
Which of the above causes/cause acid rain?
1 and 2 only
3 only
2 and 3 only
1, 2 and 3
6105.The function of heavy water in a nuclear reactor is to
Slow down the speed of neutrons
Increase the speed of neutrons
Cool down the reactor
Stop the nuclear reaction
6109.Which of the following materials is used along with iron ore and limestone to produce iron in a modern blast furnace?
coke
cementite
coal
bauxite
6114.Nitrous oxide, commonly called laughing gas, has been a matter of concern to environmentalists recently because:
it is thought to cause cancer at low concentrations.
it produces photochemical smog.
it is a greenhouse gas.
none of the above
6116.The radioactive element most commonly detected in humans is
potassium-40
cobalt-60
iodine-131
plutonium-238
6117.Radioisotopes which are used in medical diagnosis are known as
tracers
silver bullets
markers
dyes
6124.Which of the following elements was unknown to ancient civilizations?
tin
aluminum
mercury
sulfur
6126.Steel is composed of a number of elements. The two essential elements are iron and
aluminum
carbon
nickel
silicon
6128.Which of the following is not a major pollutant from automobiles?
carbon monoxide
unburned hydrocarbons
nitrous oxide
sulfur dioxide