Answer: D) Bacteria Explanation: The process by which bacteria convert nitrogen gas (N2) into ammonia (NH3) is called Nitrogen Fixation.   The conversion of nitrogen from one form to another in the nitrogen cycle is carried out primarily by Nitrogen Fixing Bacteria such as Azotobacter.

Answer: D) Mukesh Father Explanation: That man's son means Mukesh => Mukesh father's son is Mukesh => It is Mukesh's father.

Answer: C) 11/18 Explanation: Let the total number of workers be x. Then,    Number of women = x/3 and number of men = x - x/3  = 2x/3   Number of women having children = x/18   Number of men having children = x/3   Number of workers having children = (x/18) + (x/3) = 7x/18    Therefore, workers having no children = x - 7x/18 = 11/18 of all workers.

Answer: D) All the above Explanation: Chemical weathering is what happens when rocks are broken down and chemically altered. Chemical weathering is the breakdown of rocks by chemical reactions. Chemical weathering involves changes in the chemical composition of the existing rock to form new rock. Some examples of chemical weathering are hydrolysis, oxidation, carbonation, dissolution, etc.

Answer: B) Nirmala Sitharaman Explanation: Nirmala Sitharaman, who took oath as the new Cabinet member in september 2017 under Narendra Modi, has been given the Defence Ministry portfolio. Incidentally, she has become the first dedicated woman defence minister of India and only the second woman to hold the crucial ministry after Indira Gandhi.

Answer: D) Amarinder Singh Explanation:

We know a proverb that An apple a day keeps the doctor away. To keep the doctor away from her, he gave seven apples, each apple a day.

Answer: D) All the above Explanation: An interest group is an organization whose members share common concerns and try to influence government policies affecting those concerns. Interest groups are also known as lobbies.