Class 12 Physics MCQ Chapter 10 Wave Optics

Class 12 Physics MCQ Chapter 10 Wave Optics Solutions English Medium to each chapter is provided in the list so that you can easily browse through different chapters Class 12 Physics MCQ Chapter 10 Wave Optics Question Answer in English and select need one. AHSEC Class 12 Physics Objective Type Question Answer As Per AHSEC New Book Syllabus Download PDF. AHSEC Physics MCQ Class 12 Solutions.

Class 12 Physics MCQ Chapter 10 Wave Optics

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. AHSEC Class 12 Physics Multiple Choice Solutions in English Medium are part of All Subject Solutions. Here we have given AHSEC Class 12 Physics MCQ Question Answer English Medium for All Chapters, You can practice these here.

Wave Optics

Chapter: 10

MCQs

1. The condition for constructive interference in Young’s double-slit experiment is:

(i) Δϕ = (2n + 1)π

(ii) Path difference = nλ

(iii) Δx = (2n + 1)λ/2

(iv) Δϕ = nπ

Ans: (ii) Path difference = nλ.

2. The width of central maximum in single-slit diffraction increases if:

(i) Wavelength increases.

(ii) Slit width increases.

(iii) Distance to screen decreases.

(iv) Wavelength decreases.

Ans: (i) Wavelength increases.

3. In single slit diffraction, the angular width of central maximum is:

(i) λ/a

(ii) 2λ/a

(iii) a/λ

(iv) 2a/λ

Ans: (ii) 2λ/a

4. The ratio of intensities of two waves is 4:1. The ratio of amplitudes is:

(i) 2:1

(ii) 4:1

(iii) 1:4

(iv) 1:2

Ans: (i) 2:1

5. In YDSE, if the screen is moved closer to the slits, fringe width:

(i) Increases.

(ii) Decreases.

(iii) Remains constant.

(iv) First increases then decreases.

Ans: (ii) Decreases.

6. Coherent sources have:

(i) Constant phase difference.

(ii) Equal amplitude.

(iii) Different frequencies.

(iv) Same position.

Ans: (i) Constant phase difference.

7. Two waves of amplitude A interfere constructively. The resultant intensity is:

(i) A²

(ii) 2A²

(iii) 3A²

(iv) 4A²

Ans: (iv) 4A²

8. Polarisation of light proves:

(i) Light is a scalar wave.

(ii) Light is longitudinal.

(iii) Light is transverse.

(iv) Light is particle.

Ans: (iii) Light is transverse.

9. Malus’ law gives intensity as:

(i) I = I₀ cos θ

(ii) I = I₀ cos² θ

(iii) I = I₀ sin² θ

(iv) I = I₀ tan θ

Ans: (ii) I = I₀ cos² θ

10. In interference, intensity at a point is maximum when phase difference is:

(i) π

(ii) π/2

(iii) 2π

(iv) 3π

Ans: (iii) 2π

11. Brewster’s angle for glass (n = 1.5) is:

(i) 45°

(ii) 56.3°

(iii) 90°

(iv) 30°

Ans: (ii) 56.3°

12. In diffraction, if the width of the slit is reduced:

(i) The central maximum becomes narrower.

(ii) It becomes wider.

(iii) No change.

(iv) Pattern disappears.

Ans: (ii) It becomes wider.

13. Which is not a property of coherent sources?

(i) Constant phase difference.

(ii) Same frequency.

(iii) Same amplitude.

(iv) Different wavelength.

Ans: (iv) Different wavelength.

14. Two slits are separated by 0.5 mm and illuminated with light of wavelength 600 nm. The screen is 2 m away. The fringe width is:

(i) 2.4 mm.

(ii) 1.2 mm.

(iii) 0.24 mm.

(iv) 0.12 mm.

Ans: (iii) 0.24 mm.

15. In diffraction, minima occur at:

(i) sinθ = nλ/a.

(ii) sinθ = nλ/d.

(iii) a sinθ = nλ.

(iv) a sinθ = nλ (n ≠ 0).

Ans: (iv) a sinθ = nλ (n ≠ 0).