Sound waves having frequency less than 20 Hz are called __________ waves.

• Intelligent
• Inferior
• Infrasonic
• Instrumental
Correct Option: C  [ Infrasonic ]

Remark:

What is the other name for Vitamin B₂ ?

• Haemoglobin
• Dextrose
• Thiamine
• Riboflavin
Correct Option: D  [ Riboflavin ]

Remark:

Which acid is released when an Ant bites?

• Hydrochloric Acid
• Formic Acid
• Acetic Acid
• Phosphoric Acid
Correct Option: B  [ Formic Acid ]

Remark:

Cow milk is a rich source of:

• Vitamin A
• Vitamin B
• Vitamin C
• Vitamin D
Correct Option: B  [ Vitamin B ]

Remark:

The weight of a body at the centre of the earth is:

• zero
• infinite
• same as at other places
• none of these
Correct Option: A  [ zero ]

Remark:

An alternating current instead of direct current is used in long-distance electric transmission because:

• it is easy to generate
• rectification is possible
• energy losses are minimum
• it causes fewer accidents
Correct Option: C  [ energy losses are minimum ]

Remark:

A CD-ROM is a kind of:

• Optical disk
• Magnetic disk
• Fibre disk
• None of these
Correct Option: A  [ Optical disk ]

Remark:

Tajmahal is threatened mostly due to :

• Sulphur dioxide
• Carbon dioxide
• Carbon monooxide
• Water Vapour
Correct Option: A  [ Sulphur dioxide ]

Remark:

Seismology is the science of :

• Atmosphere
• Earthquake
• Fossil
• Silkworm breeding
Correct Option: B  [ Earthquake ]

Remark:

Plasma membrane in eukaryotic cells is made up of:

• Phospholipid
• Lipoprotein
• Phospholipo-protein
• Phospho-protein
Correct Option: A  [ Phospholipid ]

Remark: