Daily Challenge
Thursday, 29 October 2026
Daily Challenge — 29 October 2026
Three UPSC Prelims-pattern questions — one each from the GS I, GS II and GS III subject areas. Attempt all three before checking your answers.
Geomorphology
Consider the following pairs of plate boundary and example:
- Continent-continent convergence : Himalaya
- Ocean-continent convergence : Andes
- Transform boundary : Mid-Atlantic Ridge.
Which of the pairs given above is/are correctly matched?
Correct answer: A
Pair 1 is correct: the Indian and Eurasian continental plates collided to raise the Himalaya. Pair 2 is correct: the oceanic Nazca plate subducts beneath South America, forming the Andes. Pair 3 is wrong: the Mid-Atlantic Ridge is a divergent (constructive) boundary; the San Andreas Fault is the classic transform boundary.Directive Principles and Fundamental Duties
Article 31C, which protects laws giving effect to Articles 39(b) and 39(c) from challenge on the ground of violation of Articles 14 and 19, was inserted by which Constitutional Amendment?
Correct answer: C
The 25th Amendment (1971) inserted Article 31C. The 24th Amendment affirmed Parliament’s power to amend Fundamental Rights; the 42nd extended 31C to all Directive Principles (struck down in Minerva Mills); the 44th removed the right to property from Part III.Biotechnology and Health
In recombinant DNA technology, restriction enzymes are used to
Correct answer: C
Restriction enzymes are molecular scissors that cut DNA at specific recognition sequences. Joining fragments is done by DNA ligase, copying a segment millions of times is PCR, and separating fragments by size is gel electrophoresis.