Which of the following is an Inert Gas?

• Hydrogen
• Nitrogen
• Oxygen
• Argon
Correct Option: D  [ Argon ]

Remark:

A fan produces a feeling of comfort during hot weather because:

• fan supplies cool air
• our body radiates more heat in air
• conductivity of air increases
• our perspiration evaporates rapidly
Correct Option: D  [ our perspiration evaporates rapidly ]

Remark:

Sound travels fastest in

• Vacuum
• Steel
• Water
• Air
Correct Option: B  [ Steel ]

Remark:

When a ship ?oats on water:

• it displaces no water
• the mass of water displaced is equal to the mass of the ship
• the mass of water displaced is lesser than the mass of the ship
• the mass of water displaced is greater than the mass of the ship
Correct Option: B  [ the mass of water displaced is equal to the mass of the ship ]

Remark:

Which of the following is a vector?

• Mass
• Volume
• Speed
• Velocity
Correct Option: D  [ Velocity ]

Remark:

Sound-waves from a loud speaker is caused by:

• frequency
• vibrations
• pitch
• amplitude
Correct Option: B  [ vibrations ]

Remark:

Which of the following statements is not true about Bt cotton ?

• Bt cotton has increased profit margin of farmers
• Use of insecticides has reduced significantly
• Seeds of Bt cotton are cheaper than non-GM seeds
• Since the use of Bt cotton India's cotton export has doubled.
Correct Option: C  [ Seeds of Bt cotton are cheaper than non-GM seeds ]

Remark:

What is the name of first Indian Artificial satellite?

• Apollo
• Rohini
• Bhaskara
• Aryabhatta
Correct Option: D  [ Aryabhatta ]

Remark: launched by the Soviet Union on 19 April 1975 and built by the Indian Space Research Organisation (ISRO)

Which type of fire extinguisher is used for petroleum fire?

• Powder type
• Liquid type
• Soda acid type
• Foam type
Correct Option: A  [ Powder type ]

Remark:

Which kind of lens is used in microscope ?

• Convex
• Concave
• Biconvex and concave
• Biconcave
Correct Option: A  [ Convex ]

Remark: