A screw gauge has a pitch of 1 mm and 100 divisions on its circular scale. The least count of this instrument is: MCQ with Answer and Explanation
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Question #1
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A ray of light passes from air to glass (refractive index 1.5). If angle of incidence is 30°, angle of refraction is (sin30=0.5)
Question #2
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The magnetic susceptibility of a diamagnetic material is:
Correct Answer: Option A
Explanation:
Diamagnetic materials have small negative susceptibility (χ ≈ -10⁻⁵), meaning they weakly repel magnetic fields. Paramagnetic: small positive χ; ferromagnetic: large positive χ. This classification is based on response to external magnetic fields. Memory aid: 'Diamagnetic: repelled by magnets; χ < 0'. This conceptual question tests magnetism fundamentals, crucial for competitive exams. Always link susceptibility sign to material behavior: negative χ ⇒ diamagnetic (weak repulsion), positive ⇒ paramagnetic/ferromagnetic (attraction).
Diamagnetic materials have small negative susceptibility (χ ≈ -10⁻⁵), meaning they weakly repel magnetic fields. Paramagnetic: small positive χ; ferromagnetic: large positive χ. This classification is based on response to external magnetic fields. Memory aid: 'Diamagnetic: repelled by magnets; χ < 0'. This conceptual question tests magnetism fundamentals, crucial for competitive exams. Always link susceptibility sign to material behavior: negative χ ⇒ diamagnetic (weak repulsion), positive ⇒ paramagnetic/ferromagnetic (attraction).
Question #3
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TIR used in:
Correct Answer: Option C
Explanation:
Optical fibers: TIR confines light in core. Diamonds: high n gives small θ_c, causing multiple TIRs for sparkle. Memory aid: 'TIR applications: fibers (communication), diamonds (optics)'. Optics application frequently tested in competitive exams.
Optical fibers: TIR confines light in core. Diamonds: high n gives small θ_c, causing multiple TIRs for sparkle. Memory aid: 'TIR applications: fibers (communication), diamonds (optics)'. Optics application frequently tested in competitive exams.
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