Prism dispersion occurs because: MCQ with Answer and Explanation

Question
Prism dispersion occurs because:
A. Different colors have different frequencies
B. Prism absorbs colors selectively
C. Refractive index depends on wavelength
D. Total internal reflection
Answer: Option C
Solution (By JKSSB Mock Tests)
Dispersion: n varies with λ (Cauchy's law), causing different refraction angles for colors. Frequency constant across media; wavelength changes. Memory aid: 'n(λ) ⇒ v(λ) ⇒ different bending; violet bends most'. Conceptual question testing dispersion mechanism, frequently examined in competitive optics sections.
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Question #1
The direction of force on a current-carrying conductor in a magnetic field is given by
A. Fleming's right hand rule
B. Right hand thumb rule
C. Ampere's swimming rule
D. Fleming's left hand rule
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Correct Answer: Option D

Explanation:
Left hand rule for motor effect. Right hand rule for generator (induced current).
This question belongs to: Science Physics
Question #2
The time period of a seconds pendulum is
A. 2 s
B. 4 s
C. 0.5 s
D. 1 s
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Correct Answer: Option A

Explanation:
Seconds pendulum has period 2 s (1 s each swing).
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Question #3
Torque dimensions same as:
A. Force
B. Momentum
C. Work
D. Power
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Correct Answer: Option C

Explanation:
Torque τ = r×F: [L][MLT⁻²] = [ML²T⁻²]. Work W = F·d: same dimensions. Physically distinct: torque (vector, rotational), work (scalar, energy). Memory tip: 'Torque and work: same [ML²T⁻²]; different physical meaning'. Dimensional analysis frequently tested in competitive exams.
This question belongs to: Science Physics
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