Q.1. Which of the following has the dimensions of planck’s constant ?
(A) force Time
(B) force distance
(C) force speed
(D) force distance time
Ans:- (D)
Q.2. The energy (E) of photon is
(A) hv
(B) hv/c
(C) 1/2mv
(D) h/p
Ans:- (A)
Q.3. The SI unit of planck’s constant is
(A) Js
(B) Ws
(C) Js⁻¹
(D) Js⁻²
Ans:- (A)
Q.4. Electron volt (eV) is the measure of
(A) charge
(B) potential difference
(C) current
(D) energy
Ans:- (D)
Q.5. Dimension of planck’s constant
(A) ML²T⁻¹
(B) ML²T⁻²
(C) MLT⁻¹
(D)MLT⁻²
Ans:- (A)
Q.6. On the basis of photoelectric effect light is
(A) Wave
(B) Particle
(C) Both
(D) None of these
Ans:- (B)
Q.7. The energy of emitted photoelectrons depends up on
(A) intensity of light
(B) Wave length of light
(C) Work function of metal
(D) None of these
Ans:- (B)
Q.8. The hypothesis of matter wave was given by
(A) plank
(B) Thomson
(C) Einstein
(D) de broglie
Ans:- (D)
Q.9. Photoelectric effect occurs due to
(A) wave nature of light
(B) particle nature of light
(C) both A and B
(D) None of these
Ans:- (B)
Q.10. X- rays are made up of
(A) negatively charged particles
(B) positively charged particles
(C) electromagnetic radiations
(D) neutrons
Ans:- (C)
Q.11. The maximum kinetic energy of photoelectrons emitted in photoelectric effect depends linearly upon
(A) Square frequency of incident light
(B) frequency of incident light
(C) wavelength of incident light
(D) square of wavelength of incident light
Ans:- (B)
Q.12. Name the experiment which verified de Broglie’s relation
(A) Machelson’s interferometer
(B) photoelectric effect
(C) Davisson and Germer
(D) None of these
Ans:- (C)
Q.13. When a photon stimulates the emission of another Photon, the two photons have
(A) same energy
(B) same direction
(C) same wavelength
(D) all of above
Ans:- (D)
Q.14. Photoelectric effect reveals the
(A) wave nature of radiation
(B) particle nature of radiation
(C) both A and B
(D) e.m.f. nature of radiation
Ans:- (B)
Q.15. On which principle photocell is based
(A) compton effect
(B) Photoelectric effect
(C) electrolysis
(D) None of these
Ans:- (B)
Q.16. Photo cell is converted
(A) mechanical energy into electrical energy
(B) Electrical energy into light energy
(C) light energy into electrical energy
(D) electrical energy into mechanical energy
Ans:- (C)
Q.17. The discovery of Photoelectric effect is first observed by
(A) Einstein
(B) Heinrich Hertz
(C) J J Thomson
(D) None of these
Ans:- (B)
Q.18. If particles are moving with same velocity, then which has maximum de Broglie wavelength ?
(A) proton
(B) α-particke
(C) neutron
(D) β-particke
Ans:- (D)
Q.19. The de Broglie wavelength of a moving particle becomes larger if it’s
(A) mass is increased
(B) momentum is reduced
(C) momentum is increased
(D) velocity is increased
Ans:- (B)
Q.20. Which Photon is more energic:- A red one or a violet one ?
(A) Violet
(B) red
(C) both A and B
(D) none of these
Ans:- (A)
Q.21. A photon travels with the speed of light in vacuum and has
(A) charge and no rest mass
(B) both charge and rest mass
(C) no charge and no rest mass
(D) none of these
Ans:- (C)
Q.22. What is the rest mass of photon ?
(A) Infinity
(B) equal to mass of electron
(C) Zero
(D) none of these
Ans:- (C)
Q.23. The energy of a photon of green light of wavelength 5500 Angstrom
(A) 2.20eV
(B) 2.0eV
(C) 2.25eV
(D) 2.3eV
Ans:- (C)
Q.24. What is the minimum value of compton shift ?
(A) zero
(B) 2h/m₀C
(C) m₀C/2h
(D) none of these
Ans:- (A)
Q.25. What is the momentum of a photon of frequency v
(A) hv/C
(B) C/hv
(C) h/c
(D) none of these
Ans:- (A)