Questions

Qatar to withdraw from OPEC as of Jan 2019. OPEC, The Organization of the Petroleum Exporting Countries is an intergovernmental organisation of 14 nations, founded in 1960 in Baghdad, Iraq.

Its members are Qatar, Saudi Arabia, Iran, Iraq, Indonesia, Venezuela, Nigeria, Libya, United Arab Emirates, Algeria, Kuwait, Ecuador, Angola, Gabon.

The current Chairman of Rajya Sabha is Vice President M. Venkaiah Naidu.

Virtual memory is hardware technique where the system appears to have more memory that it actually does. This is done by time-sharing, the physical memory and storage parts of the memory one disk when they are not actively being used.

The first municipal corporation was set up in India in the year 1687 at Madras, preceding the Bombay and Delhi municipal corporations.

The meanings of the given words are as follows:
Tremulous: shaking or quivering slightly 

Stringent: (of regulations, requirements, or conditions) strict, precise, and exacting

Garrulous: excessively talkative, especially on trivial matters
Quivery: shaking or trembling slightly
Steady: firmly fixed, supported, or balanced; not shaking or moving
Conjunctive: relating to or forming a connection or combination of things
Desist: stop doing something; cease or abstain

Abstain: restrain oneself from doing or enjoying something
Defer: put off (an action or event) to a later time; postpone
Terse: sparing in the use of words; abrupt
Abrupt: sudden and unexpected
Therefore, it can be observed that option B i.e. ‘quivery, steady’ forms a synonym-antonym pair of ‘tremulous’.