Ohm's law is valid for MCQ with Answer and Explanation

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Ohm's law is valid for

A. All conductors

B. Electrolytes

C. Metallic conductors at constant temperature

D. Semiconductors only

Answer: Option C

Solution (By JKSSB Mock Tests)

Ohm's law V = IR holds for ohmic conductors (metals) provided temperature and physical conditions constant. Non-ohmic: semiconductors, diodes, electrolytes. Graph V-I is straight line for ohmic. Temperature changes resistance, so condition necessary.

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Question #1

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The phenomenon of total internal reflection is used in:

A. Both (a) and (b)

B. Optical fibers

C. Diamond cutting

D. Neither

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Correct Answer: Option A

Explanation:
Total internal reflection (TIR) is exploited in optical fibers for light transmission with minimal loss (core-cladding interface). In diamonds, high refractive index (n≈2.4) gives small critical angle (~24°), so most light undergoes TIR, enhancing brilliance through multiple reflections. Memory aid: 'TIR applications: optical fibers (communication), diamonds (sparkle), prisms (binoculars)'. This application question tests optics uses, frequently appearing in competitive exams. Always link physical principles to technological applications; competitive exams emphasize practical relevance of theoretical concepts.

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