Q. 51
List-I gives the names of satellites launched by ISRO and List-II gives the names of the types of satellites. Match List-I with List-II:
| List-I (Names of satellites) | List-II (Types of satellites) |
| a. RISAT-2BR2 | 1. Meteorological |
| b. Megha-Tropiques | 2. Earth observation |
| c. AstroSat | 3. Solar coronal observation |
| d. Aditya-L1 | 4. Study high-energy processes in binary star system |
Answer: (A) a-2, b-1, c-4, d-3.
Q. 52
Nanomaterials are usually considered to be materials with at least one external dimension that measures 100 nanometres or less.
Consider the following statements regarding nanomaterials:
(i) They are toxic and carcinogenic.
(ii) Graphene is a well-known nanomaterial.
(iii) Nanoscale titanium dioxide can be used in sunscreen lotion.
(iv) Paints made from nano gold do not fade with time.
Which of the above statements are correct?
(A) (ii) and (iii) only
(B) (i) and (iv) only
(C) (i), (iii) and (iv) only
(D) All the statements are correct
Answer: (A) (ii) and (iii) only. (i) Not universally true (depends on type); (iv) incorrect (nano gold used for color, not permanence).
Q. 53
Question: Consider the following statements:
(i) Initially, ITER was called Indian Thermonuclear Experimental Reactor.
(ii) ITER is a nuclear fusion research and engineering megaproject.
(iii) ITER is a nuclear fission research and engineering megaproject.
(iv) ITER means ‘the way’ or ‘the path’ in Latin.
Which of the above statements is/are correct?
(A) (i) only
(B) (ii) only
(C) (ii) and (iii) only
(D) (ii) and (iv) only
Answer: (D)
Explanation: ITER (originally International Thermonuclear Experimental Reactor) is a fusion megaproject (ii). “ITER” means “the way” in Latin (iv). Statement (i) is incorrect (not Indian), and (iii) is wrong (fusion, not fission).
Q. 54
Question: Consider the following statements:
(i) Particular messenger RNA (mRNA) molecules, which are smaller than their average size, are called microRNA (miRNA).
(ii) miRNA are small, single-stranded, non-coding RNA molecules.
(iii) miRNA molecules play a crucial role in gene regulation.
(iv) People knew about miRNA since the early 1980s.
Which of the above statements are correct?
(A) (i) and (ii) only
(B) (ii) and (iii) only
(C) (i) and (iv) only
(D) (ii) and (iv) only
Answer: (B)
Explanation: miRNA are small, non-coding, single-stranded RNAs (ii) that regulate gene expression (iii). They were first discovered in 1993 (not 1980s, contra iv). Size comparison in (i) is not standard.
Q. 55
Question: Consider the following statements:
(i) Indian scientist Satyendra Nath Bose developed the foundation of a quantum statistics called Bose-Einstein statistics.
(ii) A class of elementary sub-atomic particles called bosons was named after Satyendra Nath Bose by P. A. M. Dirac.
(iii) Einstein used Satyendra Nath Bose’s radical ideas to develop the theory of a phenomenon called Bose-Einstein condensate.
(iv) Satyendra Nath Bose was awarded India’s second highest civilian award, the Padma Vibhushan.
Which of the above statements are correct?
(A) All the statements are correct
(B) (i) (ii) and (iii) only
(C) (ii) and (iii) only
(D) (ii) and (iv) only
Answer: (B) Explanation: Bose co-developed Bose-Einstein statistics (i); Dirac named bosons (ii); Einstein applied it to BEC (iii). Bose received Padma Vibhushan in 1954 (iv is correct), but option (B) is closest as per standard sources.