Suitable impurities are added to a semi-conductor depending on its use. This is done in order to
(a) Increase its electrical resistivity
(b) Increase its electrical conductivity
(c) Enable it to withstand higher voltages
(d) Increase its life
Which of the following enzymes are present in Saliva?
Select the correct codes:
(a) Only 1
(b) 1, 3 and 4
(c) 2, 3 and 4
(d) All of these.
Maximum absorption of electrolytes like sodium and calcium as well as water takes place in which part of body?
(b) Vermiform appendix
(c) Small intestine
(d) Large intestine
Ozone hole refers to
(a) Increase in the thickness of ozone layer in troposphere
(b) Decrease in thickness of ozone layer in stratophere
(c) Decrease in the ozone layer troposphere
(d) Hole in ozone layer
Other than spreading malaria, anopheles mosquitoes are also vectors of
(b) Yellow fever
(c) Dengue fever
Which one is incorrectly matched?
(a) AIDS Virus - reverse transcriptase
(b) Replicationfork- MRNA
(c) Oncogenes - ageing
(d) Initiation factors - amino acids
Production of which one of the following is a function of the liver?
(a) hydrochloric acid
Prostaglandin and its derivatives inhibit hair growth. It is a
Which of these radiations is absorbed by ozone layer present in upper atmosphere?
(a) Infrared and UV radiation
(b) Infrared radiation
(c) UV radiation
(d) None of these
Which is not the application of hydrogen?
(a) Fuel cell, an electrochemical device converting chemical energy of hydrogen directly into electricity without combustion
(b) Production of solar energy
(c) Chemical feedstock in industry
(d) Clean fuel in automobile