Diffraction demonstrates light's: MCQ with Answer and Explanation

Diffraction demonstrates light's:
A. EM nature
B. Dual nature
C. Wave nature
D. Particle nature
Answer: Option C
Solution (By JKSSB Mock Tests)
Diffraction (bending around obstacles) is wave phenomenon explained by Huygens' principle. Particle model predicts straight-line propagation. Memory aid: 'Diffraction/interference ⇒ wave nature; photoelectric ⇒ particle nature'. Wave-particle duality frequently tested in competitive exams.

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Practice More Physics Questions

Question #1
LED works on the principle of
A. Field emission
B. Photoelectric effect
C. Electroluminescence
D. Thermionic emission

Correct Answer: Option C


Explanation:
Recombination of electrons and holes emits light in forward-biased p-n junction.

This question belongs to: Science Physics
Question #2
Atmospheric pressure at sea level in pascal is approximately
A. 1.01 × 10³ Pa
B. 1.01 × 10⁷ Pa
C. 1.01 × 10⁵ Pa
D. 1.01 × 10⁹ Pa

Correct Answer: Option C


Explanation:
Standard atmospheric pressure 1 atm = 1.01325 × 10⁵ Pa ≈ 1.01 × 10⁵ Pa = 101 kPa. Also equals 760 mm of Hg. This is an important conversion for pressure units.

This question belongs to: Science Physics
Question #3
Fuse protects circuit by:
A. Storing energy
B. Amplifying signal
C. Limiting voltage
D. Melting on overcurrent

Correct Answer: Option D


Explanation:
Fuse wire melts when current exceeds rating (Joule heating I²R), breaking circuit to prevent damage. Sacrificial overcurrent protection. Memory aid: 'Fuse = thermal cutoff; rated current slightly above normal'. Safety device function frequently tested in competitive electricity sections.

This question belongs to: Science Physics