Which one of the following colours has longest wave length ?

• Green
• Yellow
• Red
• Blue
Correct Option: C  [ Red ]

Remark:

What changes will happen to a ball of ice and water kept at exactly zero degree Celsius?

• All ice will melt
• All water will become ice
• No change will happen
• Only some ice will melt
Correct Option: C  [ No change will happen ]

Remark:

Gasoline is obtained from crude petroleum by:

• Fractional distillation
• Fractional distillation
• Sublimation
• Evaporation
Correct Option: A  [ Fractional distillation ]

Remark:

Living in the atmosphere of CO is dangerous because it:

• Reduces organic matter of tissues
• Dries up the blood
• Combined with O₂ present inside to form CO₂
• Combines with haemoglobin and makes it incapable of absorbing oxygen
Correct Option: C  [ Combined with O₂ present inside to form CO₂ ]

Remark:

RADAR is used for

• locating submerged submarines
• receiving signals in a radio receiver
• locating geostationary satellites
• detecting and locating the position of objects such as aeroplane
Correct Option: D  [ detecting and locating the position of objects such as aeroplane ]

Remark:

A substance used in the fire extinguisher under the trade name of Pyrene is:

• Carbon dioxide
• Chloroform
• Carbon tetrachloride
• Bleaching powder
Correct Option: C  [ Carbon tetrachloride ]

Remark:

Insecticides usually act upon:

• Muscular system
• Digestive system
• Nervous system
Correct Option: C  [ Nervous system ]

Remark:

Volumetric method for determination of fat % of milk is:

• Waste fall balance
• Soxhlet method
• Richmond sliding method
• Garber method
Correct Option: D  [ Garber method ]

Remark:

Normal human blood is:

• Acidic
• Alkaline
• Neutral
• Variable
Correct Option: B  [ Alkaline ]

Remark:

Which of the following copper alloys is used for the manufacture of springs and suspension filaments in electrical instruments?

• Bronze
• Aluminium bronze
• German silver
• Phosphor bronze
Correct Option: D  [ Phosphor bronze ]

Remark: