Question: Pick out the correct statement ?

• 1. Jet engine can work, where there is no atmosphere
• 2. Rocket engines cannot work, where there is no atmosphere
• 3. Rocket engines carry oxygen required for the combustion in the form of oxidiser
• 4. Jet engines also carry oxidiser

Question: Pick out the wrong statement?

• 1. Processing of thermosetting plastics is ideally done by injection moulding
• 2. Processing of thermoplastics is ideally done by compression moulding
• 3. Mass production of seamless pipes are done by electrical resistance welding (ERW)
• 4. Stretch forming is a process of cold drawing

Question: Atmospheric pollution caused by the exhaust gas of supersonic transport air-crafts is mostly in the atmospheric region called________________?

• 1. Thermosphere
• 2. Stratosphere
• 3. Troposphere
• 4. Mesosphere

Question: ____________ is removed from water by lime-soda process?

• 1. Foul smell and taste
• 2. Iron and manganese
• 3. Temporary hardness
• 4. Permanent hardness

Question: Most of the atmospheric air pollutants are present in large quantity in__________________?

• 1. Stratosphere
• 2. Thermosphere
• 3. Troposphere
• 4. Mesosphere

Question: Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about ______________ decibels?

• 1. 90
• 2. 120
• 3. 150
• 4. 180

Question: Death may occur, when SO2 concentration in atmospheric air exceeds ______________ ppm?

• 1. 20
• 2. 100
• 3. 400
• 4. 200

Question: Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?

• 1. Hydrocarbons
• 2. Hydrogen fluoride
• 3. Hydrogen sulphides
• 4. Nitrogen dioxide

Question: ______________ cannot control the noise pollution ?

• 1. Use of silencers
• 2. Green house gases
• 3. Vibration damping
• 4. Tree plantation

Question: Which of the following is the most major constituents of air pollutants ?

• 1. Oxides of sulphur
• 2. Oxides of nitrogen
• 3. Carbon monoxide
• 4. Hydrogen sulphide