Nda

The majority charge carriers in a p-type semiconductor are 

A. free electrons 

B. conduction electrons 

C. ions 

D. holes

Which one of the following statements about microbes is not correct? 

A. They are used in sewage treatment plants. 

B. They are used in industrial fermenters for the production of beverages. 

C. No antibiotic has been obtained from any microbe. 

D. They are used to get many bioactive molecules for the treatment of diseases.

The compound C₆H₁₂O₄ contains 

A. 22 atoms per mole 

B. twice the mass percent of H as compared to the mass percent of C 

C. six times the mass percent of C as compared to the mass percent of H 

D. thrice the mass percent of H as compared to the mass percent of O

Who among the following used the term Industrial Revolution for the first time in English to describe the changes that occun-ed in the British industrial development between 1760 and 1820 ? 

A. Friedrich Engels 

B. Eric Hobsbawm 

C. Arnold Toynbee 

D. Georges Michelet

Zinc is used to protect iron from corrosion because zinc is 

A. more electropositive than iron 

B. cheaper than iron 

C. a bluish white metal 

D. a good conductor of heat and electricity

Which compound, when dissolved in water, conducts electricity and forms a basic solution? 

A. HCl 

B. CH₃COOH 

C. CH₃OH 

D. NaOH

Who among the following is the winner of the Singapore Open superseries Badminton Men’s Singles title 2017? 

A. kidambi Srikanth 

B. Lin Dan 

C. B. Sai Praneeth 

D. Kento Momota

Which one of the following about the Swadeshi Campaign in 1896 is not conect? 

A. Its centre was Maharashtra 

B. Its main participants were students 

C. It opposed the levy of tariff on imports 

D. It publicly burnt foreign clothes

If some object is weighed when submerged in water, what will happen to its weight in air ? 

A. Increase 

B. Decrease 

C. Remain exactly the same 

D. Increase or decrease cannot be predicted

In the following passage, at certain points you are given a choice of four words marked A, B,C and D one of which fits the meaning of the passage. Choose the best word out of the four. Mark the letter, viz., A, B,C and D, relating to this word on your Answer Sheet. Examples K and L have been solved for you.

The