A vitamin requires cobalt for its activity. The vitamin is:

• Vitamin B₁₂
• vitamin D
• vitamin B₂
• Vitamin A
Correct Option: A  [ Vitamin B₁₂ ]

Remark:

The Kyoto Protocol is associated with :

• Environment
• Nuclear Power
• Trade
• none of these
Correct Option: A  [ Environment ]

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 process in which living organisms are used to remove contaminants, pollution or other unwanted substances from soil or water is known as:

• Biotechnology
• bioremediation
• Biodegradation
• Biomagnification
Correct Option: B  [ bioremediation ]

Remark:

Hepatitis affects which organ of the human body?

• Liver
• Pancreas
• Spleen
• Small intestine
Correct Option: A  [ Liver ]

Remark:

Hydro?uoric acid is not kept in glass bottles because it reacts with:

• visible light
• sodium oxide of glass
• aluminium oxide of glass
• silicon dioxide of glass
Correct Option: D  [ silicon dioxide of glass ]

Remark:

LCD stands for

• Liquid Crystal Display
• Low Current Display
• Light Circuit Display
• None of the above
Correct Option: A  [ Liquid Crystal Display ]

Remark:

When an iron nail gets rusted, iron oxide is formed.

• without any change in the weight of the nail.
• with decrease in the weight of the nail.
• with increase in the weight of the nail.
• without any change in colour or weight of the nail.
Correct Option: C  [ with increase in the weight of the nail. ]

Remark: Rust is composed of iron oxide, which forms as a result of the reaction between iron, oxygen, and water.

What is the full form of LAN?

• Line Area Network
• Linear Area Network
• Local Area Network
• Land Area Network
Correct Option: C  [ Local Area Network ]

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: