PU CSS 2026 Physical Optics Free Quiz 1

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PU CSS 2026 Physical Optics Free Quiz 1

PU CSS Quiz

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Navigator 10 Q

General

General 10 MCQs

1. What is the nature of light?

A. Wave-particle duality B. Only wave nature C. Only particle nature D. Neither wave nor particle

2. What is the speed of light in vacuum?

A. 3 × 10⁷ m/s B. 3 × 10⁸ m/s C. 3 × 10⁹ m/s D. 3 × 10⁶ m/s

3. Which of the following is an electromagnetic wave?

A. Sound waves B. Water waves C. Seismic waves D. Light waves

4. What is interference of light?

A. Superposition of waves B. Bending of waves around obstacles C. Restriction of wave vibrations D. Bending of waves at a boundary

5. When does destructive interference occur?

A. Waves are in phase B. Waves have different frequencies C. Waves are out of phase D. Waves have different amplitudes

6. What is the condition for constructive interference in Young's double slit experiment?

A. (m+1/2)λ B. (m+1/2)λ C. (m+1/4)λ D. mλ

7. What is the condition for destructive interference in Young's double slit experiment?

A. (m+1/2)λ B. mλ C. (m+1/4)λ D. (m+3/4)λ

8. What is diffraction?

A. Bending of waves around obstacles B. Superposition of waves C. Restriction of wave vibrations D. Bouncing of waves from a surface

9. When is diffraction most pronounced?

A. Wavelength is much smaller than obstacle size B. Wavelength is comparable to obstacle size C. Wavelength is much larger than obstacle size D. Wavelength is zero

10. What is special about the central maximum in single slit diffraction?

A. All maxima have equal width B. Central maximum is narrower C. Central maximum is twice as wide D. Central maximum is absent

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