WHATSAPP Welcome to Edugrown – Your Learning Partner
🛒
Previous Year Questions

PYQ Bank & Paper Generator

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

📝 Generate Question Paper
14,017 Questions
#1 Class 12 Physics Wave Optics 2023 Long 1M CBSE
Assertion (A): In Young's double slit experiment, if slit separation $d$ and screen distance $D$ are both reduced to $1/3$, the fringe width remains the same. Reason (R): Fringe width is proportional to $d/D$.
👁 View Answer
👍 1 👎 1
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#2 Class 12 Physics Wave Optics 2021 Short 2M CBSE
In a Young's double slit experiment, the path difference at a point on the screen between two interfering waves is $\frac{\lambda}{8}$. Find the ratio of intensity at this point to that at the centre of a bright fringe.
👁 View Answer
👍 1 👎 1
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#3 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
The diffraction effect can be observed in
A. sound waves only
B. light waves only
C. ultrasonic waves only
D. sound waves as well as light waves
👁 View Answer
👍 2 👎 2
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#4 Class 12 Physics Wave Optics 2022 Long 1M CBSE
Assertion (A): Two light sources emitting waves of similar wavelengths are coherent. Reason (R): Two light sources emitting waves having zero or constant phase difference are known as coherent sources.
👁 View Answer
👍 2 👎 1
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#5 Class 12 Physics Wave Optics 2022 Mcq 1M CBSE
When the slit width in a single-slit diffraction experiment is increased (keeping source intensity same), which graph correctly shows the new intensity pattern?
A. Central maximum becomes narrower and brighter
B. Central maximum becomes wider and dimmer
C. No change
D. Central maximum becomes narrower and dimmer
👁 View Answer
👍 2 👎 2
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#6 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
A single slit of width 0.5 mm is illuminated by parallel light of wavelength 5000 Å. The diffraction pattern is observed on a screen 1 m away. The width of the central maximum is
A. 500 mm
B. 600 mm
C. 700 mm
D. 2 mm
👁 View Answer
👍 1 👎 2
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#7 Class 12 Physics Wave Optics 2021 Mcq 1M CBSE
In Young's experiment, if a thin transparent glass plate is introduced normally in one of the beams, then
A. fringes will disappear
B. fringe width will increase
C. fringe width will decrease
D. fringe width remains the same but pattern shifts
👁 View Answer
👍 1 👎 1
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#8 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
When a compact disc is illuminated by white light, coloured lanes are observed. This is due to
A. dispersion
B. diffraction
C. interference
D. refraction
👁 View Answer
👍 1 👎 1
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#9 Class 12 Physics Wave Optics 2018 Mcq 1M CBSE
The bending of a beam of light around the corners of an obstacle is called
A. reflection
B. refraction
C. diffraction
D. interference
👁 View Answer
👍 2 👎 2
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#10 Class 12 Physics Wave Optics 2019 Mcq 1M CBSE
In Young's double slit experiment, for which colour is the fringe width the least?
A. green
B. red
C. blue
D. yellow
👁 View Answer
👍 1 👎 1
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#11 Class 12 Physics Wave Optics 2021 Mcq 1M CBSE
What happens if monochromatic light in Young's double slit experiment is replaced by white light?
A. no fringes are observed
B. all bright fringes become white
C. all bright fringes are coloured between violet and red
D. only central fringe is white and all other fringes are coloured
👁 View Answer
👍 1 👎 1
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#12 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
Interference takes place due to change in
A. velocity
B. intensity
C. amplitude
D. phase difference
👁 View Answer
👍 2 👎 2
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#13 Class 12 Physics Wave Optics 2019 Mcq 1M CBSE
If light waves emitted by two coherent sources have wavelengths $\lambda_A$ and $\lambda_B$, then
A. $\lambda_A = \lambda_B$
B. $\lambda_A > \lambda_B$
C. $\lambda_A < \lambda_B$
D. None of these
👁 View Answer
👍 3 👎 3
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#14 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
In Young's double slit experiment, interference was observed with air present. If the chamber is evacuated and the same light is used, we will see
A. no interference
B. interference with dark bands
C. interference with bright bands
D. interference with increased fringe width
👁 View Answer
👍 2 👎 3
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#15 Class 12 Physics Wave Optics 2021 Mcq 1M CBSE
In Young's double slit experiment, if one slit is covered with a red filter and the other with a green filter, the interference pattern will be
A. red
B. green
C. yellow
D. invisible
👁 View Answer
👍 3 👎 2
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#16 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
When exposed to sunlight, thin films of oil on water exhibit brilliant colours due to the phenomenon of
A. interference
B. diffraction
C. dispersion
D. polarisation
👁 View Answer
👍 2 👎 2
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#17 Class 12 Physics Wave Optics 2011 Mcq 1M CBSE
Bright colours exhibited by a spider's web exposed to sunlight are due to
A. diffraction
B. polarisation
C. interference
D. resolution
👁 View Answer
👍 2 👎 2
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#18 Class 12 Physics Wave Optics 2018 Mcq 1M CBSE
In Huygens' wave theory, the locus of all points oscillating in the same phase is called a
A. ray
B. vibrator
C. wavefront
D. half period zone
👁 View Answer
👍 1 👎 1
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#19 Class 12 Physics Wave Optics 2019 Mcq 1M CBSE
The inverse square law of intensity (illuminance) is valid for
A. plane wavefront
B. conical wavefront
C. spherical wavefront
D. cylindrical wavefront
👁 View Answer
👍 1 👎 2
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
#20 Class 12 Physics Wave Optics 2020 Mcq 1M CBSE
Huygens' wave theory of light cannot explain
A. diffraction
B. interference
C. polarisation
D. photoelectric effect
👁 View Answer
👍 2 👎 1
✅ Verified by Super Admin
Rate: ★ ★ ★ ★ ★
Advertisement

🔔 Email Updates Lein

Naya content aate hi email par pata chal jayega. Sirf wahi sections chunein jo chahiye.

🔒 Content copy nahi kar sakte