The unit of resistance is MCQ with Answer and Explanation

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The unit of resistance is

A. Ohm

B. Ampere

C. Watt

D. Volt

Answer: Option A

Solution (By JKSSB Mock Tests)

Ohm (Ω) = V/A.

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Question #1

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A wave has frequency 50 Hz and wavelength 0.6 m. Its speed is

A. 0.012 m/s

B. 30 m/s

C. 300 m/s

D. 83.3 m/s

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Correct Answer: Option B

Explanation:
Wave speed v = fλ = 50 × 0.6 = 30 m/s. Basic wave equation. Ensure consistent units: frequency Hz (s⁻¹), wavelength m. Speed of sound 340 m/s in air, this is slower.

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Question #2

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The phenomenon of splitting of spectral lines in magnetic field is called

A. Zeeman effect

B. Stark effect

C. Raman effect

D. Compton effect

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Correct Answer: Option A

Explanation:
Zeeman effect: splitting due to magnetic field. Stark effect due to electric field.

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Question #3

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TIR condition: light travels from:

A. Any media at any angle

B. Denser to rarer with i > θ_c

C. Vacuum to medium

D. Rarer to denser

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Correct Answer: Option B

Explanation:
Total internal reflection requires: (1) denser→rarer medium, (2) incidence angle > critical angle. Memory aid: 'TIR: n₁>n₂ AND i>θ_c'. Optics condition frequently tested in competitive exams.

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