Which gas is used as fire extinguisher?

• Nitrogen dioxide
• Carbon monoxide
• Carbon dioxide
• Nitrous oxide
Correct Option: C  [ Carbon dioxide ]

Remark:

In India which is the most widely used form of renewable energy ?

• Geothermal energy
• Hydro-electric energy
• Solar energy
• Thermal energy
Correct Option: C  [ Solar energy ]

Remark:

The phenomenon of light associated with the appearance of the blue Colour of the sky is:

• interference
• reflection
• refraction
• scattering
Correct Option: D  [ scattering ]

Remark:

White lung disease is prevalent among the workers of:

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

Remark:

Red blood corpuscles are formed in:

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

Remark:

Marijuana, a psychoactive drug is obtained from:

• seeds of pop
• capsules of poppy
• female inflorescence of cannabis
• male inflorescence of cannabis
Correct Option: C  [ female inflorescence of cannabis ]

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:

Threat of 'global warming' is increasing due to increasing concentration in the atmosphere of:

• O₃
• CO₂
• SO₂
• NO₂
Correct Option: B  [ CO₂ ]

Remark:

Plants absorb dissolved nitrates from soil and convert them into:

• free nitrogen
• urea
• ammonia
• proteins
Correct Option: C  [ ammonia ]

Remark:

Which of the following cell organelles is referred to as the 'suicidal bags' or 'disposal units' ?

• Lysosome
• Peroxisomes
• Glyoxisomes
• Mtochondria
Correct Option: A  [ Lysosome ]

Remark: