Answer: A) Mukesh Ambani Explanation: According to 2018 January reports, Mukesh Ambani is the first richest person in India being 18th in the world, followed by Azim Premji and S.P. Hinduja in second and third places.

Answer: D) All the above Explanation: As per the latest updates, India is :   Largest producer of milk. Largest producer of millets in the world. Largest producer of jute. Largest producer of ginger. Largest producer of bananas. Largest producer of castor oil seeds. Largest producer of mangoes. Largest producer of safflower oil seeds. Largest producer of papayas. Largest producer of cottonseed (As per International Cotton Advisory Committee (ICAC) report for the month of March 2017)   Second largest producer of tea, the first position being held by China. Second largest producer of sugarcane, the first position being held by Brazil. Second largest producer of wheat, the first position being held by China. Second largest producer of onions, the first position being held by China. Second largest producer of potatoes, the first position being held by China. Second largest producer of garlic, the first position being held by China. Second largest producer of rice, the first position being held by China. Second largest producer of cement., next to China. Second largest producer of silk, the first position being held by China.

Answer: A) Yin-tu Explanation: The Chinese writers mention India by the name of "Yin-tu".

Answer: C) rapid spring snowmelt Explanation: There are lots of reasons behind the flood in any area but the main reason is a heavy downpour or rapid snowmelt can flood canyons with a mixture of soil, rock, and water is a major cause of floods.   When the spring times come, sometimes there's a lot of warmth that suddenly comes, especially nowadays when there are things such as global warming. So the snow melts and large amounts of water can flood the fields that are often found at the foot of a mountain or similar things.   But they may also be caused by deforestation, drainage channel modification from a landslide, earthquake or volcanic eruption. Examples include outburst floods and lahars.

Answer: C) H2O Explanation: The common greenhouse gas containing only hydrogen and oxygen is H2O, this is water vapor. The common greenhouse gases are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. The composition (chemical formula) of those gases are: Water vapor: H2OCarbon dioxide: CO2Methane: CH4Nitrous oxide: NOOzone: O3. As you see the only one of those that contains only hydrogen and oxygen is H2O, water vapor.

Answer: C) Troposphere Explanation: The troposphere is the lowest layer of the atmosphere and where most clouds are. That means all weather is in the troposphere. Almost all weather occurs in the Troposphere, basically, the lowest layer that goes up to about 10 - 15 kms.

Answer: A) oxygen, nitrogen, carbon, hydrogen, sulfur, and phosphorus Explanation: Living organisms often contain trace amounts of several elements, but the most abundant ones are oxygen, carbon, hydrogen, nitrogen, calcium, sulphur and phosphorus.

Answer: B) Foreigners Regional Registration Office Explanation: Home Minister Rajnath Singh launched the web-based application e-FRRO (e-Foreigners Regional Registration Office) scheme under which foreigners can avail, various visa and immigration-related services online. This will facilitate hassle-free travel to India for foreigners.