Students preparing for CBSE Class 12 Physics Board Exam usually ask about important MCQ Questions here, we’ve provided important MCQ Questions for class 12 Physics Dual Nature of Radiation and Matter of NCERT here. Check important Class 12 Physics MCQ Questions of Dual Nature of Radiation and Matter with Answers. Here you’ll also get important links to access some important articles for the preparation of CBSE Class 12 board exams.
The MCQ Questions for class 12 Physics with answers are prepared as per the newest syllabus, and examination pattern suggested in school 12 by CBSE, NCERT. Multiple Choice Questions for important part of exams for Class 12 Physics and if practiced properly can assist you to induce higher marks. Have a glance at the MCQ Questions for Class 12 and cross-check your answers during preparation.
Practice MCQ Question for Class 12 Physics chapter-wise
1. De-Broglie equation states the:
(a) dual nature
(b) particle nature
(c) wave nature
(d) none of these
2. Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them?
(a) Energy
(b) Time period
(c) Frequency
(d) Momentum
3. Kinetic energy of emitted electrons depends upon :
(a) frequency
(b) intensity
(c) nature of atmosphere surrounding the electrons
(d) none of these
4. The strength of photoelectric current depends upon :
(a) angle of incident radiation
(b) frequency of incident radiation
(c) intensity of incident radiation
(d) distance between anode and cathode
5. Millikan’s oil drop experiment makes use of:
(a) Stokes’ law
(b) Boyle’s law
(c) Gas equation
(d) Bernoulli’s theorem
6. When a yellow light is incident on a surface, no electrons are emitted while green light can emit electrons. If the red light is incident on the surface then:
(a) no electrons are emitted
(b) photons are emitted
(c) electrons of higher energy are emitted
(d) electrons of lower energy are emitted
7. Evidence of the wave nature of light cannot be obtained from:
(a) diffraction
(b) interference
(c) doppler effect
(d) reflection
8. According to Einstein’s photoelectric equation the plot of the kinetic energy of the emitted photo-electrons from a metal vs the frequency of the incident radiation gives a straight line whose slope
(a) depends on the nature of the metal used
(b) depends on the intensity of the radiation
(c) depends both on the intensity of the radiation and the metal used
(d) is the same for all metals and independent of the intensity of the radiation
9. A metal surface ejects electrons when hit by green light but nothing when hit by yellow light. The electrons will be ejected when the surface is hit by
(a) blue light
(b) heat rays
(c) infrared light
(d) red light
10. Which of the following statements is correct regarding the photoelectric experiment?
(a) The photocurrent increases with intensity of light
(b) Stopping potential increases with increase in intensity of incident light
(c) The photocurrent increases with increase in frequency
(d) All of these
11. Which phenomenon best supports the theory that matter has a wave nature?
(a) Electron momentum
(b) Electron diffraction
(c) Photon momentum
(d) Photon diffraction
12. A strong argument for the particle nature of cathode rays is that they
(a) produce fluoroscence
(b) travel through vacuum
(c) get deflected by electric and magnetic fields
(d) cast shadow
13. In an electron gun the control grid is given a negative potential relative to cathode in order to
(a) decelerate electrons
(b) repel electrons and thus to control the number of electrons passing through it
(c) to select electrons of same velocity and to converge them along the axis.
(d) to decrease the kinetic energy of electrons
14. When the speed of electrons increase, then the value of its specific charge
(a) increases
(b) decreases
(c) ramains unchanged
(d) increases upto some velocity
15. In which of the following, emission of electrons does not take place?
(a) Thermionic emission
(b) X-rays emission
(c) Photoelectric emission
(d) Secondary emission
16. Photoelectric emmision occurs only when the incident light has more than a certain minimum
(a) power
(b) wavelength
(c) intensity
(d) frequency
17. A photoelectric cell is a device which
(a) converts light into electricity
(b) converts electricity into light
(c) stores light
(d) stores electricity
18. Of the following properties, the photon does not possess
(a) rest mass
(b) momentum
(c) energy
(d) frequency
19. The minimum energy required to eject an electron, from the metal surface is called
(a) atomic energy
(b) mechanical energy
(c) electrical energy
(d) work function
20. Electron volt (ev) is the unit of
(a) energy
(b) potential
(c) current
(d) charge
21. In the Davisson and Germer experiment, the velocity of electrons emitted from the electron gun can be increased by
(a) increasing the filament current
(b) decreasing the filament current
(c) decreasing the potential difference between the anode and filament
(d) increasing the potential difference between the anode and filament
22. A particle which has zero rest mass and non-zero energy and momentum must travel with a speed:
(a) Equal to c, the speed of light in vacuum
(b) Greater than c
(c) Less than c
(d) Tending to infinity
23. Photocell is a device to:
(a) Store photons
(b) Measure light intensity
(c) Convert photon energy into mechanical energy
(d) Store electrical energy for replacing storage batteries
24. When ultraviolet radiation is incident on asurface, no photoelectrons are emitted. If asecond beam causes photoelectrons to beejected, it may consists of
(a) infra-red waves
(b) X-rays
(c) visible light rays
(d) radio waves
25. In Davison-Germer experiment, an electron beam is incident on a crystal. The reflected beam consists of
(a) photons
(b) protons
(c) x-rays
(d) electrons
