421: In the context of which one of the following arc the terms pyrolysis and plasma gasification mentioned?
(a) Extraction of rare earth elements
(b) Natural gas extraction technologies
(c) Hydrogen fuel-based automobiles
(d) Waste-to-energy technologies
Explanation:
In developing Three-Year Action Agenda (2017-18 to 2019-20), the Niti Aayog has drawn a broader framework for addressing the issue of municipal solid waste (MSW). The solution being suggested by the Action Agenda is twin-fold: waste-to-energy incinerators for bigger municipalities and composting method of waste disposal for small towns and semi-urban areas. While proposing incineration as a solution, the Niti Aayog has also assessed the benefit-cost ratio of thermal pyrolysis and plasma gasification technologies.
422: The highest milk producing breed of goat in India is
(a) Barbari
(b) Jamnapari
(c) Black Bengal
(d) Beetal
423: The chief constituent of gobar gas is:
(a) Hydrogen
(b) Nitrogen
(c) Ethane
(d) Methane
424: For which one of the following is capillarity not the only reason ?
(a) Blotting of ink
(b) Rising of underground water
(c) Spread of water drop on a cotton cloth
(d) Rising of water from the roots of a plant to its foliage
Explanation:
Rising of water from the roots of a plant to its foliage depends upon capillary action (cohesive and adhesive forces) and Transpiration pull (major action).
425: Assertion (A):
A lock of Einstein's hair, if scientists could locate it and extract its DNA, could help in producing another Einstein, by cloning.
Reason (R):
The DNA extracted from the cell of an embryo at an early stage of development, can be transferred to individual eggs which in turn can be implanted into the uterus of a surrogate mother to give birth to an identical off spring.
In the context of the above two statements, which one of the following is correct ?
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true