The phenomenon of total internal reflection is used in: MCQ with Answer and Explanation

The phenomenon of total internal reflection is used in:

A. Both (a) and (b)

B. Neither

C. Optical fibers

D. Diamond cutting

Answer: Option A

Solution (By JKExamLibrary)

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.

This question belongs to: Science Physics

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Question #1 Report Error

If the radius of the earth shrinks by 1%, its mass remaining the same, the value of 'g' on the earth's surface would:

A. Increase by 2%

B. Decrease by 1%

C. Decrease by 2%

D. Increase by 1%

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Correct Answer: Option A

Explanation:
The acceleration due to gravity is given by g = GM/R². For a small change, taking the derivative or using error approximation: Δg/g = -2(ΔR/R). If R shrinks by 1% (ΔR/R = -1%), then Δg/g = -2(-1%) = +2%. Therefore, the value of 'g' will increase by approximately 2%.

This question belongs to: Science Physics

Question #2 Report Error

The device which converts mechanical energy into electrical energy is

A. Motor

B. Rectifier

C. Generator

D. Transformer

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Correct Answer: Option C

Explanation:
Generator uses electromagnetic induction to produce electricity from mechanical motion.

This question belongs to: Science Physics

Question #3 Report Error

The pitch of a sound becomes higher if

A. Frequency increases

B. Amplitude increases

C. Wavelength increases

D. Speed decreases

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Correct Answer: Option A

Explanation:
Higher frequency → higher pitch. Amplitude increases loudness. Wavelength inversely proportional to frequency (v constant). So increasing frequency increases pitch.

This question belongs to: Science Physics

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