Which of the following is a greenhouse gas

• Chlorofluoro carbon
• Carbon
• Calcium
• None of these
Correct Option: A  [ Chlorofluoro carbon ]

Remark: Chlorofluorocarbons (CFCs) are considered greenhouse gases due to their ability to trap heat in the Earth's atmosphere.

Norman E. Borlaug is associated with

• Green Revolution
• White Revolution
• Pink Revolution
• Blue Revolution
Correct Option: A  [ Green Revolution ]

Remark: Norman E. Borlaug was awarded the Nobel Peace Prize in 1970 in recognition of his contributions to global food production.

Which of the following allow the electric current to pass through it ?

• Glasses
• Graphite
• Rubber
• PVC
Correct Option: B  [ Graphite ]

Remark:

White lung disease is prevalent among the workers of:

• paper industry
• cement industry
• cotton industry
• pesticide industry
Correct Option: B  [ cement industry ]

Remark:

The acceleration due to gravity at the equator:

• is less than that at the poles
• is greater than that at the poles
• is equal to that at the poles
• does not depend on the earth's centripetal acceleration
Correct Option: A  [ is less than that at the poles ]

Remark:

When pressure is increased, then the melting point of ice:

• Increases
• Decreases
• Remains unchanged
• Depends on the impurities in the ice
Correct Option: B  [ Decreases ]

Remark:

Red blood corpuscles are formed in:

• Heart
• Bone marrow
• Liver
• Kidney
Correct Option: B  [ Bone marrow ]

Remark:

Rickets is a disease caused by the deficiency of

• Vitamin- K
• Vitamin- D
• Vitamin- B1
• Vitamin- A
Correct Option: B  [ Vitamin- D ]

Remark:

Under critical temperature, on compressing gases turn to liquid, because:

• molecules are of finite size.
• molecules have random motion.
• molecules have inter-molecular forces.
• molecules are spherical.
Correct Option: C  [ molecules have inter-molecular forces. ]

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: