TIR used in: MCQ with Answer and Explanation

TIR used in:

A. Both

B. Diamond brilliance

C. Optical fibers

D. Neither

Answer: Option A

Solution (By JKExamLibrary)

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.

This question belongs to: Science Physics

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Practice More Physics Questions

Question #1 Report Error

The focal length of a concave mirror is 15 cm. The radius of curvature is

A. 45 cm

B. 7.5 cm

C. 15 cm

D. 30 cm

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Correct Answer: Option D

Explanation:
For spherical mirrors, R = 2f. So R = 2 × 15 = 30 cm. Sign convention: for concave mirror, f and R are negative by Cartesian convention, but magnitude 30 cm. So 30 cm is correct.

This question belongs to: Science Physics

Question #2 Report Error

Radioactivity is a phenomenon associated with

A. Chemical reactions

B. Molecular vibrations

C. Electron transitions

D. Nuclear instability

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Correct Answer: Option D

Explanation:
Unstable nuclei emit radiation to become stable.

This question belongs to: Science Physics

Question #3 Report Error

The relation V = IR is applicable to

A. Gaseous conductors

B. Semiconductors

C. Ohmic conductors

D. Non-ohmic devices

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Correct Answer: Option C

Explanation:
Ohm's law V=IR is linear relationship, valid for ohmic materials like metals at constant temperature. Non-ohmic do not follow linear I-V. Semiconductors are non-ohmic.

This question belongs to: Science Physics

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