Brass gets discoloured in air due to constant exposure in presence of:

• Aluminium sulphide
• Aluminium phosphide
• Hydrogen sulphide
• Hydrogenated wafers
Correct Option: C  [ Hydrogen sulphide ]

Remark:

Check the odd term out:

• Internet
• Linux
• Unix
• Windows
Correct Option: A  [ Internet ]

Remark:

One of the constitutes of tear gas is:

• Ethane
• Ethanol
• Ether
• Chloropicrin
Correct Option: D  [ Chloropicrin ]

Remark:

Which one of the following is a chemical change ?

• Burning of candle
• Melting of wax
• Vapourisation of water
• Magnetising of Iron
Correct Option: A  [ Burning of candle ]

Remark:

Which of the following is not a renewable source of energy ?

• Natural gas
• Geothermal energy
• Flowing water
• Biomass
Correct Option: A  [ Natural gas ]

Remark:

Which of the following diseases is not caused by virus ?

• Small pox
• AIDS
• Flue
• Malaria
Correct Option: D  [ Malaria ]

Remark:

India first atomic device was exploded in 1974 at:

• Bikaner
• Barmed
• Pokhran
• Jaisalmer
Correct Option: C  [ Pokhran ]

Remark: Pokhran is a city in Rajasthan

The time period of a pendulum when taken to the Moon would:

• remain the same
• decrease
• become zero
• increase
Correct Option: D  [ increase ]

Remark:

'Mirage' is an example of:

• refraction of light only
• total internal reflection of light only
• refraction and total internal reflection of light
• dispersion of light only
Correct Option: C  [ refraction and total internal reflection of light ]

Remark:

The weight of a person on the surface of the moon will be about one-sixth of his weight on the surface of the earth. This is because

• The moon has no air.
• The moon has no water.
• The gravity of the moon is about half of the earth.
• The gravity of the moon is abouut one-sixth of that of the earth.
Correct Option: D  [ The gravity of the moon is abouut one-sixth of that of the earth. ]

Remark: