The phenomenon of diffraction is most pronounced when: MCQ with Answer and Explanation

The phenomenon of diffraction is most pronounced when:
A. Obstacle size is much smaller than wavelength
B. Obstacle size is much larger than wavelength
C. Obstacle size is comparable to wavelength
D. Wavelength is zero
Answer: Option C
Solution (By JKSSB Mock Tests)
Diffraction (bending of waves around obstacles) is significant when obstacle or aperture size is comparable to the wavelength of the wave. If size >> λ, diffraction is negligible (ray optics); if size

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Practice More Physics Questions

Question #1
An object placed at infinity in front of a convex mirror forms image at
A. C behind mirror
B. F behind mirror
C. Between P and F behind mirror
D. At infinity

Correct Answer: Option B


Explanation:
Distant object image at focus, behind mirror, virtual, diminished.

This question belongs to: Science Physics
Question #2
If the random error in measurement of radius of a sphere is 2%, the error in volume is
A. 6%
B. 2%
C. 8%
D. 4%

Correct Answer: Option A


Explanation:
Volume V = (4/3)πr³. Fractional error ΔV/V = 3 Δr/r. Percentage error = 3 × 2% = 6%. Important for error analysis in competitive exams.

This question belongs to: Science Physics
Question #3
A transformer has 400 primary turns and 100 secondary turns. If primary voltage is 220 V, secondary voltage is
A. 880 V
B. 110 V
C. 55 V
D. 440 V

Correct Answer: Option C


Explanation:
Vs/Vp = Ns/Np => Vs = 220 × (100/400) = 55 V. Step-down.

This question belongs to: Science Physics