The question asks about the second domain of 6G R&D testbeds funded by the Department of Telecommunications (DoT) in April 2025, given that one focuses on THz communication. This requires knowledge of recent government initiatives in telecommunications research.
C) Advanced optical communication is the correct domain. The DoT's announcement specifically mentioned THz communication and advanced optical communication as the two key areas for the funded 6G testbeds.
The question asks about the primary function of proteins in the human body. To answer this, we need to recall the main roles of different macronutrients.
B) Growth and repair of tissues — Proteins are the building blocks of the body. They are crucial for the growth of new tissues, the repair of damaged tissues, and the maintenance of existing cells. This includes muscles, organs, skin, hair, and nails.
The question asks for the location where the SLINEX 24 bilateral naval exercise between India and Sri Lanka was conducted in December 2024. To answer this, one needs to recall or know the specific details of this particular naval exercise, especially its venue.
A) Visakhapatnam — The bilateral naval exercise SLINEX 24 between India and Sri Lanka was indeed conducted in Visakhapatnam in December 2024. Visakhapatnam is a major naval base on India's east coast and frequently hosts such international exercises.
The question asks why canal irrigation is particularly suitable for the northern plains of India. We need to evaluate each option based on the geographical and hydrological characteristics of the region.
D) The flat land and perennial rivers support canal networks. This option accurately describes the ideal conditions present in the northern plains for the development and maintenance of an extensive canal irrigation system. The flat topography facilitates the digging of canals and the gravitational flow of water, while the perennial rivers ensure a constant water supply, making canal irrigation a highly effective method in this region.
The question asks to identify the primary pollutants responsible for acid rain. Acid rain is a significant environmental issue caused by atmospheric pollution. We need to recall the main chemical precursors that react in the atmosphere to form acidic compounds.
Correct Option: B) Sulphur dioxide and nitrogen oxides are the main culprits behind acid rain. They are released from industrial processes, power generation, and vehicle emissions, and they react in the atmosphere to form sulfuric and nitric acids.
The question asks to identify India's biggest multi-sport national competition. We need to evaluate each option based on its nature (multi-sport vs. single-sport) and scale (national competition).
B) National Games is the correct answer. The National Games of India are the country's largest multi-sport event, organized by the Indian Olympic Association, featuring athletes from all states and union territories competing in numerous sports.
The question asks to identify an acid and its salts commonly used as food preservatives to inhibit the growth of mould, yeast, and fungi. This requires knowledge of common food additives and their specific antimicrobial properties.
Correct Option: D) Sorbic acid. Sorbic acid and its salts are widely recognized and used as food preservatives due to their effectiveness against mould, yeast, and fungi, especially in acidic conditions. They function by inhibiting microbial enzyme systems.
The question asks to identify the individual appointed as China's International Trade Negotiator in April 2025. This is a factual question related to current affairs and appointments. To answer correctly, one needs to recall or know recent high-profile appointments in China's trade sector.
Correct Option: A) Li Chenggang was appointed as China's International Trade Negotiator (Vice Minister-level) in April 2025. This appointment is a significant development in China's trade diplomacy.
The question asks to identify the Indian athlete who set a new national record in the 200m sprint at the 2025 Asian Athletics Championships. This is a factual recall question related to sports achievements.
A) Animesh Kujur — Animesh Kujur indeed set a new national record in the men's 200m sprint at the 2025 Asian Athletics Championships, clocking a time of 20.50 seconds. This performance surpassed the previous national record.
The question asks about the standard action performed when a user double-clicks an icon on a computer desktop. This is a fundamental concept in operating system interaction.
Correct Option: C) It opens the application or file.