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Previous Year Questions

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Board, class, subject, chapter, year-wise PYQ. Practice effectively and ace your board exams.

9,374 Questions
CBSE
#1 Class 12 Physics Dual Nature of Radiation and Matter 2022 Long 1M
Assertion (A): Photoelectrons produced by a monochromatic light beam incident on a metal surface have a spread in their kinetic energies. Reason (R): The work function of the metal varies as a function of depth from t...
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CBSE
#2 Class 12 Physics Dual Nature of Radiation and Matter 2019 Mcq 1M
When ultraviolet rays are incident on a metal plate, photoelectric effect does not occur. It occurs by incidence of
A. X-rays
B. radio waves
C. infrared rays
D. greenhouse effect
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CBSE
#3 Class 12 Physics Dual Nature of Radiation and Matter 2016 Mcq 1M
If the intensity of light falling on a metal is increased (frequency above threshold), then
A. KE of photoelectrons increases
B. photoelectric current increases
C. KE of photoelectrons decreases
D. photoelectric current remains constant
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CBSE
#4 Class 12 Physics Dual Nature of Radiation and Matter 2015 Mcq 1M
In the photoelectric effect, the number of electrons ejected per second is proportional to
A. intensity of light
B. wavelength of light
C. frequency of light
D. work function of the metal
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CBSE
#5 Class 12 Physics Dual Nature of Radiation and Matter 2021 Short 2M
If the kinetic energy of an electron doubles, by what factor does its de-Broglie wavelength change?
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CBSE
#6 Class 12 Physics Dual Nature of Radiation and Matter 2020 Short 1M
Write the expression for the mass of a photon of frequency $\nu$.
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CBSE
#7 Class 12 Physics Dual Nature of Radiation and Matter 2021 Mcq 1M
The de-Broglie wavelength $\lambda$ depends upon mass $m$ and kinetic energy $E$ as
A. $\lambda \propto (mE)^{1/2}$
B. $\lambda \propto m^{1/2} E^{1/2}$
C. $\lambda \propto m^{-1/2} E^{-1/2}$
D. $\lambda \propto m^{-1/2} E^{1/2}$
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CBSE
#8 Class 12 Physics Dual Nature of Radiation and Matter 2019 Mcq 1M
If a photon has velocity $c$ and frequency $\nu$, which of the following represents its wavelength?
A. $h\nu/c^2$
B. $h\nu$
C. $hc/E$
D. $h\nu/c$
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CBSE
#9 Class 12 Physics Dual Nature of Radiation and Matter 2020 Short 2M
An electron of mass $m$ and charge $e$ is accelerated from rest through a potential difference $V$ in vacuum. Find its final velocity.
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CBSE
#10 Class 12 Physics Dual Nature of Radiation and Matter 2017 Mcq 1M
Which one of the following is chargeless?
A. Alpha particle
B. Beta particle
C. Photon
D. Proton
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CBSE
#11 Class 12 Physics Dual Nature of Radiation and Matter 2018 Mcq 1M
The value of 1 MeV is
A. $1.6 \times 10^{-13}$ J
B. $1.6 \times 10^{-19}$ J
C. $1.6 \times 10^{-16}$ J
D. $1.6 \times 10^{-15}$ J
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CBSE
#12 Class 12 Physics Dual Nature of Radiation and Matter 2019 Mcq 1M
The energy of emitted photoelectrons depends upon
A. intensity of light
B. wavelength of light
C. work function of metal
D. none of these
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CBSE
#13 Class 12 Physics Dual Nature of Radiation and Matter 2020 Mcq 1M
The number of photons of frequency $10^{14}$ Hz in radiation of energy $6.62$ J will be
A. $10^{10}$
B. $10^{15}$
C. $10^{20}$
D. $10^{25}$
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CBSE
#14 Class 12 Physics Wave Optics 2022 Short 2M
A beam of light of wavelength $\lambda = 600$ nm from a distant source falls on a single slit 1 mm wide and the diffraction pattern is observed on a screen 2 m away. Find the distance between the first dark fringes on...
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CBSE
#15 Class 12 Physics Wave Optics 2021 Short 2M
If the 5th order maximum of wavelength 4000 Å in Young's double slit experiment coincides with the $n$th order maximum of wavelength 5000 Å, find $n$.
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CBSE
#16 Class 12 Physics Wave Optics 2022 Short 2M
Two waves have amplitude ratio 5:1 and produce interference. Find the ratio of maximum to minimum intensity.
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CBSE
#17 Class 12 Physics Wave Optics 2023 Short 3M
A slit is illuminated by monochromatic light of wavelength $\lambda = 6000$ Å. The angular width of the central maximum in diffraction is measured. When the slit is next illuminated by light of wavelength $\lambda'$, ...
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CBSE
#18 Class 12 Physics Wave Optics 2021 Short 2M
Write two differences between interference pattern and diffraction pattern.
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CBSE
#19 Class 12 Physics Wave Optics 2022 Short 2M
In a double slit experiment using light of wavelength 600 nm, the angular width of the fringe formed on a distant screen is 0.1°. Find the spacing between the two slits.
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CBSE
#20 Class 12 Physics Wave Optics 2020 Short 2M
Define a wavefront. How is it different from a ray?
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