Part of earth where life exist is known as:

• Lithosphere
• Hydrosphere
• Atmosphere
• Biosphere
Correct Option: D  [ Biosphere ]

Remark:

The optimum dissolved oxygen level (in mg/litre) required for survival of aquatic organism is:

• 4-6
• 2-4
• 8-10
• 12-16
Correct Option: A  [ 4-6 ]

Remark:

Acupuncture is a medical system of treatment in which:

• herbs are used to relieve pain
• needles are inserted into particular parts of the body to relieve pain
• surgery is done to relieve pain
• none of these
Correct Option: B  [ needles are inserted into particular parts of the body to relieve pain ]

Remark:

Which of the following colours is not seen in a rainbow ?

• Yellow
• Green
• Red
• Brown
Correct Option: D  [ Brown ]

Remark:

Which of the following is an aquatic fern?

• Adiantum
• Dryopteris
• Salvinia
• Equisetum
Correct Option: C  [ Salvinia ]

Remark: Salvinia, a genus in the family Salviniaceae, is a floating aquatics with creeping stems, branched, bearing hairs on the leaf surface papillae but no true roots, named in honor of Anton Maria Salvini, Italian scientist.

Which of the following metals is the most ductile metal?

• Gold
• Aluminium
• Copper
• Tin
Correct Option: A  [ Gold ]

Remark:

Persistence of vision is the principle behind:

• Camera
• Binocular
• Cinema
• Periscope
Correct Option: C  [ Cinema ]

Remark:

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

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

Remark:

Hepatitis affects which organ of the human body?

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

Remark:

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

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

Remark: