The electrical resistance of a conductor depends on its
A. Transparency
B. Magnetic property
C. Length and area of cross-section
D. Colour
Answer: Option C
Solution (By JKSSB Mock Tests)
R = ρL/A, depends on length (L), cross-sectional area (A), and resistivity (ρ) which depends on material and temperature. Not on colour or transparency.
Explanation:
Least count of screw gauge = Pitch / Number of circular scale divisions. Given pitch = 1 mm, divisions = 100, so LC = 1 mm / 100 = 0.01 mm. This represents the smallest measurement the instrument can accurately detect. Screw gauges measure small dimensions like wire diameter with high precision. Memory tip: Least count formula is universal for vernier and screw instruments: value per division on main scale divided by total circular divisions. This concept is frequently tested in practical physics sections of competitive exams.
No comments yet. Be the first to start the discussion!