UPSC CAPF AC 2025 Paper 1 · Question 114

Question 114 of the UPSC CAPF (AC) 2025 Paper I (3 August 2025). Try it first, then open the answer and explanation.

CAPF 2025 · P-I · Q114 · General Science · Physics
Match List-I with List-II and select the answer using the code given below the Lists: List-I (Device) List-II (Phenomenon) A. Periscope 1. Conduction and convection minimization B. Lightning conductors 2. Moment of a force C. Thermos flask 3. Reflection by plane mirrors D. Levers 4. Static electricity
1. A-2, B-4, C-1, D-3
2. A-3, B-1, C-4, D-2
3. A-3, B-4, C-1, D-2
4. A-2, B-1, C-4, D-3
सूची-I को सूची-II से सुमेलित कीजिए और सूचियों के नीचे दिए गए कूट का प्रयोग कर उत्तर चुनिए : सूची-I (उपकरण) सूची-II (परिघटना) A. पेरिस्कोप 1. चालन और संवहन न्यूनतमीकरण B. तड़ित् चालक 2. बल का आघूर्ण C. थर्मस फ्लास्क 3. समतल दर्पणों द्वारा परावर्तन D. लीवर 4. स्थिर विद्युत्
1. A-2, B-4, C-1, D-3
2. A-3, B-1, C-4, D-2
3. A-3, B-4, C-1, D-2
4. A-2, B-1, C-4, D-3
Show answer
Answer: (3) A-3, B-4, C-1, D-2
उत्तर: (3) A-3, B-4, C-1, D-2
A periscope uses two parallel plane mirrors at 45° (A-3); a lightning conductor safely leads the static charge of a thundercloud to earth (B-4); a thermos flask's vacuum gap between double walls cuts heat transfer by conduction and convection, and its silvered surfaces reduce radiation (C-1); a lever works on the principle of moments of a force (D-2).

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