Dispersion occurs because: MCQ with Answer and Explanation

Dispersion occurs because:

A. Prism absorbs colors

B. Different colors have different speeds in medium

C. Different frequencies

D. TIR occurs

Answer: Option B

Solution (By JKExamLibrary)

n varies with λ ⇒ v = c/n varies ⇒ different refraction angles (Snell's law). Frequency constant; wavelength changes in medium. Memory aid: 'Dispersion: n(λ) ⇒ v(λ) ⇒ different bending; violet bends most'. Optics concept frequently tested in competitive exams.

This question belongs to: Science Physics

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The SI unit of luminous flux is

A. Lux

B. Candela

C. Lumen

D. Watt

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Correct Answer: Option C

Explanation:
Lumen (lm) = cd·sr. Candela is luminous intensity. Lux is illuminance (lm/m²). These are photometric units, important in lighting.

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Question #2 Report Error

A pulley system has 4 pulleys. Its velocity ratio (number of supporting ropes) is

A. 4

B. 1

C. 2

D. 8

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Correct Answer: Option A

Explanation:
For ideal block and tackle with n movable pulleys, VR = n = 4.

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Question #3 Report Error

Which thermodynamic process occurs at a constant volume?

A. Adiabatic process

B. Isothermal process

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D. Isochoric process

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Correct Answer: Option D

Explanation:
An isochoric process is a thermodynamic process in which the volume of the closed system remains constant (delta V = 0). Because there is no change in volume, the system does zero pressure-volume work (W = Pdelta V = 0). According to the first law of thermodynamics, any heat added goes entirely into increasing the internal energy. Isobaric is constant pressure; isothermal is constant temperature.

This question belongs to: Science Physics

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