Which kind of lens is used in microscope ?

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

Remark:

What is the S.I. unit of electric current?

• Volt
• Watt
• Ampere
• Ohm
Correct Option: C  [ Ampere ]

Remark:

Which of the following contains maximum carbon dioxide ?

• Grasslands
• Forests
• Oceans
• Agroecosystems
Correct Option: C  [ Oceans ]

Remark:

Which one among the following is strong smelling agent used in LPG cylinder to help in the detection of gas leakage?

• Ethanol
• Thioethanolanine
• Methane
• Chloroform
Correct Option: B  [ Thioethanolanine ]

Remark:

Fathom is unit of:

• Depth
• Distance
• Frequency
• Sound
Correct Option: A  [ Depth ]

Remark:

The only snake that builds its nest is:

• Krait
• King cobra
• Chain viper
• Saw scaled viper
Correct Option: B  [ King cobra ]

Remark:

Which among the following elements increases the absorption of water and calcium in plants ?

• Manganese
• Boron
• Copper
• Molybdenum
Correct Option: B  [ Boron ]

Remark:

What is the frequency range of audible waves?

• 20 to 20000 Hz
• 21000 to 24000 Hz
• 25000 to 30000 Hz
• 31000 to 40000 Hz
Correct Option: A  [ 20 to 20000 Hz ]

Remark: The audible range of sound for human beings extends from about 20 Hz to 20000 Hz (one Hz = one cycle/s). Children under the age of five and some animals, such as dogs can hear up to 25 kHz (1 kHz = 1000 Hz). As people grow older their ears become less sensitive to higher frequencies.

Thyroid gland is located

• near the heart
• at the base of the brain
• below the liver
• in the neck region
Correct Option: D  [ in the neck region ]

Remark:

The largest artery in human body is:

• Aorta
• Capillary
• Vena cava
• Pulmonary vein
Correct Option: A  [ Aorta ]

Remark: The aorta is the largest artery of the body and carries blood from the heart to other part of the body.