Change set

Pick exam & year, then Go.

Question map
Not attempted Correct Incorrect ★ Bookmarked
Loading…
Q114 (CAPF/2025) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Basic mechanics concepts Answer Verified

Match List-I with List-II and select the answer using the code given below the Lists : List-I (Device) A. Periscope B. Lightning conductors C. Thermos flask D. Levers List-II (Phenomenon) 1. Conduction and convection minimization 2. Moment of a force 3. Reflection by plane mirrors 4. Static electricity Code : (a) A-2 B-4 C-1 D-3 (b) A-3 B-1 C-4 D-2 (c) A-3 B-4 C-1 D-2 (d) A-2 B-1 C-4 D-3

Result
Your answer: —  ·  Correct: C

Explanation

The matching of devices to their physical phenomena is as follows: (A) Periscope utilizes reflection by plane mirrors, typically using two mirrors at 45-degree angles to allow viewing over obstacles. (B) Lightning conductors protect buildings by providing a path for static electricity (lightning) to reach the ground safely, preventing damage from high-voltage atmospheric discharges. (C) A Thermos flask uses a double-wall vacuum design to minimize heat transfer via conduction and convection, thereby maintaining the temperature of its contents. (D) Levers operate on the principle of the moment of a force (torque), where a force applied at one point produces a turning effect around a fixed fulcrum to move a load. This systematic pairing aligns with the principles of geometrical optics, thermal physics, and basic mechanics.

How others answered
Each bar shows the % of students who chose that option. Green bar = correct answer, blue outline = your choice.
Community Performance
Out of everyone who attempted this question.
65%
got it right
✓ Thank you! We'll review this.

SIMILAR QUESTIONS

CDS-II · 2017 · Q51 Relevance score: 3.43

Match List-I with List-II and select the correct answer using the code given below the Lists : List-I List-II (Concern) (Product) A. TISCO 1. Chemicals B. BALCO 2. Iron & Steel C. BPCL 3. Electronics D. BEL 4. Aluminium Code :

CDS-I · 2018 · Q35 Relevance score: 3.41

Match List-I (Cloud) with List-II (Characteristic) and select the correct answer using the code given below the lists:

List-I (Cloud) List-II (Characteristic)
A. Cirrus 1. Rain-giving
B. Stratus 2. Feathery appearance
C. Nimbus 3. Vertically growing
D. Cumulus 4. Horizontally spreading

Code:

A B C D
(A) 3 1 4 2
(B) 2 1 4 3
(C) 2 4 1 3
(D) 3 4 1 2

NDA-I · 2010 · Q35 Relevance score: 3.40

Match List-I with List-II and select the correct answer using the code given below the Lists : List-I (landform) A. Inselbergs B. Stalagmite C. Delta D. Moraines List-II (Agent of erosion/ deposition) 1. River 2. Glacier 3. Undergroundwater 4. Wind Code : A B C D

NDA-II · 2011 · Q33 Relevance score: 3.37

Match List I with list II and select the correct answer using the code given below the lists : List-I (Metallic oxide) A. Uranium oxide B. Cuprous oxide C. Cobalt oxide D. Chromium oxide List-II (Colour imparted to glass) 1. Red 2. Blue 3. Green 4. Yellow Code : A B C D

CAPF · 2010 · Q92 Relevance score: 3.32

Match List-I with List-II and select the correct answer using the code given below the lists : List-I A. Isobars B. Isohels C. Isochrones List-II 1. Lines of equal time 2. Lines of equal pressure 3. Lines of equal salinity 4. Lines of equal duration of sun- light Code : ABC