An endoscope is used by a physician to view the internal parts of a body organ. It is based on the principle of:

• refraction of light
• re?ection of light
• total internal re?ection of light
• dispersion of light
Correct Option: C  [ total internal re?ection of light ]

Remark:

Which layer of the atmosphere is nearest to the surface of the earth?

• Mesosphere
• Thermosphere
• Troposphere
• Stratosphere
Correct Option: C  [ Troposphere ]

Remark:

Number of spinal nerves in human are:

• 11 pairs
• 27 pairs
• 32 pairs
• 31 pairs
Correct Option: D  [ 31 pairs ]

Remark:

The gas used for artificial ripening of green fruit is:

• Ethylene
• Ethane
• Carbon dioxide
• None of these
Correct Option: A  [ Ethylene ]

Remark:

Which of the following processes is responsible for transforming liquid into vapour ?

• Condensation
• Evaporation
• Transpiration
• Sublimation
Correct Option: B  [ Evaporation ]

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:

Chiropterochory is a seed dispersal process through

• Birds
• Bats
• Reptiles
• Insects
Correct Option: B  [ Bats ]

Remark:

Which of the following is the first calculating device ?

• Abacus
• Calculator
• Turing machine
• Pascaline
Correct Option: A  [ Abacus ]

Remark:

Who invented Dynamite?

• J B Dunlop
• Alfred Nobel
• James Simons
• Peter Hargreaves
Correct Option: B  [ Alfred Nobel ]

Remark:

Oncology is the study of

• Branch of science that deals with eyes
• Branch of science that deals with Brain
• Branch of science that deals with Tumours and Cancers
• Branch of science that deals with Blood Circulation
Correct Option: C  [ Branch of science that deals with Tumours and Cancers ]

Remark: