A nuclear reactor coolant is a coolant in a nuclear reactor used to remove heat from the nuclear reactor core and transfer it to electrical generators and the environment. Heavy water is used as coolant in Atomic reactor.

Indian Space Research Organisation (ISRO) will launch its advanced cartography satellite “Cartosat-3” towards the end of October or early November. Cartosat-3 will be launched using the Polar Satellite Launch Vehicle (PSLV) rocket.

 Allantois is a sac-like structure, primarily involved in nutrition and excretion and is webbed with blood vessels. The function of the allantois is to collect liquid waste from the embryo, as well as to exchange gases used by the embryo.

Neither of the two assumptions is implicit in the given statement. It cannot be assumed that Peterson himself posted any content on twitter that lead to his ouster. Similarly, there is nothing in the statement to suggest that it would be very difficult for him to comeback now.

Correct Option is 3 : Methane 
Biogas refers to a mixture of different gases produced by the breakdown of organic matter in the absence of oxygen. Biogas can be produced from raw materials such as agricultural waste, manure, municipal waste, plant material, sewage, green waste or food waste. Biogas is a renewable energy source. Biogas comprises primarily methane (CH4) and carbon dioxide (CO2) and may have small amounts of hydrogen sulphide (H2S), moisture and siloxanes.

Let numbers be 3x and 8x respectively.
Their HCF is x which is equal to 7.
So, numbers are 21 and 56
LCM (21, 56) = 168

The Constitution of Jammu and Kashmir was adopted on 17 November 1956, and came into effect on January 26, 1957. The Constitution of Jammu & Kashmir, which maharaja Dr. Karan Singh signed into law in 1957, is still in force (till July 2019).

As some Editors are Actors and all actors are writers, so some editors are writers. Therefore, Conclusion I follow. However, conclusion II is not a definite case hence does not follows.

Famous English fiction writer Amitav Ghosh was conferred with the Jnanpith Award, 2018.

 Acids, strong or weak, donate a proton (H+) to the solution causing a raise in H+ concentration. In water H+ and OH- ions are equal thus it us neutral. When acid is added there is release of energy and H+ ions release and when base is added there is absorption of energy and OH- ions are released.An acid or base's strength refers to its degree of ionization. A strong acid will completely ionize in water while a weak acid will only partially ionize. Since there are different degrees of ionization, there are different levels of weakness. This produces more hydronium ions and conjugate base. Acids ionise in water to produce hydrogen ions, H+.
Strong acids fully ionise. 
So according to this only II option is correct