Q. 56
Question: Consider the following statements:
(i) Dark oxygen was discovered in 2013 by Andrew Sweetman while conducting ship-based fieldwork in the Pacific Ocean.
(ii) Dark oxygen was discovered in 2013 by Andrew Sweetman while conducting research on deep plasma in cometary tails.
(iii) Dark oxygen refers to molecular oxygen that is produced in the total darkness of the very deep ocean.
(iv) Dark oxygen refers to the medical oxygen cylinders, which are sold in the black market.
Which of the above statements is/are correct?
(A) (i) only
(B) (ii) only
(C) (iv) only
(D) (i) and (iii) only
Answer: (D)
Explanation: Andrew Sweetman discovered dark oxygen in 2013 in the Clarion-Clipperton Zone (Pacific) via polymetallic nodules producing Oâ‚‚ in darkness (i, iii). (ii) and (iv) are incorrect.
Q. 57
Question: If an object undergoes a uniform circular motion, then its
(A) Acceleration remains uniform
(B) Velocity changes
(C) Speed changes
(D) Velocity remains uniform
Answer: (B)
Explanation: In uniform circular motion, speed is constant, but velocity changes due to direction change (centripetal acceleration).
Q. 58
Question: The tendency of a liquid drop to contract and occupy minimum area is due to
(A) Surface tension
(B) Viscosity
(C) Density
(D) Vapour pressure
Answer: (A) Explanation: Surface tension minimizes surface area for a given volume, causing spherical shape in drops.
Q. 59
Question: Match the following books (List-I) with the names of the authors (List-II):
| List-I | List-II |
| a. India Against Itself : Assam and the Politics of Nationality | 1. Udayon Misra |
| b. Burden of History : Assam and the Partition—Unresolved Issues | 2. Sanjib Baruah |
| c. Writing on the Wall : Reflections on the North-East | 3. Nani Gopal Mahanta |
| d. Confronting the State : ULFA’s Quest for Sovereignty | 4. Sanjoy Hazarika |
Select the correct answer using the codes given below.
(A) a-2, b-1, c-4, d-3
(B) a-1, b-2, c-4, d-3
(C) a-2, b-1, c-3, d-4
(D) a-1, b-2, c-3, d-4
Answer: (B) Explanation:
- a → Udayon Misra
- b → Sanjib Baruah
- c → Sanjoy Hazarika
- d → Nani Gopal Mahanta
Q. 60
Question: Which of the following statements are true about Sustainable Development Goals (SDGs)?
(i) SDGs, also known as the Global Goals, were adopted by the United Nations in 2015.
(ii) It was a universal call to action to end poverty, protect the planet and ensure that by 2030 all people enjoy peace and prosperity.
(iii) The 17 SDGs are integrated—they recognize that action in one area will affect outcomes in others and development must balance social, economic and environmental sustainability.
(iv) The SDGs are designed to end poverty, hunger, AIDS and discrimination against women and girls.
Select the correct answer using the codes given below.
(A) (i) and (ii) only
(B) (ii) and (iii) only
(C) (i), (ii), (iii) and (iv)
(D) (iii) and (iv) only
Answer: (C)
Explanation: All statements are correct as per UN SDG framework adopted in 2015.