Class 12 Physics MCQ Chapter 11 Dual Nature of Radiation and Matter

Class 12 Physics MCQ Chapter 11 Dual Nature of Radiation and Matter 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 11 Dual Nature of Radiation and Matter 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 11 Dual Nature of Radiation and Matter

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.

Dual Nature of Radiation and Matter

Chapter: 11

MCQs

1. The de Broglie wavelength of a particle is inversely proportional to its:

(i) energy.

(ii) momentum.

(iii) mass.

(iv) velocity.

Ans: (ii) momentum.

2. Which of the following particles has the shortest de Broglie wavelength if they are moving with the same velocity?

(i) Electron.

(ii) Proton.

(iii) Neutron.

(iv) Alpha particle.

Ans: (iv) Alpha particle.

3. The photoelectric effect supports the idea that light –

(i) is a wave.

(ii) is a longitudinal wave.

(iii) behaves as a particle.

(iv) behaves only as an electromagnetic wave.

Ans: (iii) behaves as a particle.

4. Threshold frequency is the frequency below which –

(i) No emission of electrons takes place.

(ii) Electrons are emitted with maximum kinetic energy.

(iii) The metal glows.

(iv) None of these.

Ans: (i) No emission of electrons takes place.

5. Einstein’s photoelectric equation is –

(i) E = mc².

(ii) K.E. = hν + φ.

(iii) K.E. = hν − φ.

(iv) K.E. = φ − hν.

Ans: (iii) K.E. = hν − φ.

6. The unit of work function is –

(i) joule.

(ii) hertz.

(iii) second. 

(iv) volt.

Ans: (i) joule.

7. The kinetic energy of emitted photoelectrons increases with –

(i) Increase in intensity.

(ii) Increase in frequency.

(iii) Decrease in frequency.

(iv) Increase in work function.

Ans: (iv) Increase in frequency.

8. Wave nature of particles was experimentally confirmed by –

(i) Davisson and Germer.

(ii) Einstein.

(iii) Planck.

(iv) Rutherford.

Ans: (i) Davisson and Germer.

9. Wave nature of particles was experimentally confirmed by –

(i) Davisson and Germer.

(ii) Einstein.

(iii) Planck.

(iv) Rutherford.

Ans: (i) Davisson and Germer.

10. The wavelength of a photon of energy 6.63 × 10⁻¹⁹ J is –

(a) 1 m

(b) 3 × 10⁻⁷ m

(c) 4 × 10⁻⁷ m

(d) 5 × 10⁻⁷ m

Ans: (b) 3 × 10⁻⁷ m

11. Planck’s constant has units of –

(a) J/s

(b) J·s

(c) N·m

(d) kg·m/s

Ans: (b) J·s.

12. Which of the following has both wave and particle nature?

(a) Electron.

(b) Proton.

(c) Photon.

(d) All of these.

Ans: (d) All of these.

13. Which quantity is not associated with a photon?

(a) Energy.

(b) Momentum.

(c) Mass.

(d) Speed.

Ans: (c) Mass. 

14. Wave nature of particles was experimentally confirmed by –

(a) Davisson and Germer.

(b) Einstein.

(c) Planck.

(d) Rutherford.

Ans: (a) Davisson and Germer.

15. When the kinetic energy of a particle is doubled, its de Broglie wavelength becomes –

(a) √2 times.

(b) Half.

(c) 1/√2 times.

(d) Double.

Ans: (c) 1/√2 times.