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Hello good people out there, we are providing you Physics Exam Question Paper class 12 of 2080-2023 which examination was held on 2080-Baishakh-29 (May 12, 2023). You can view and download pdf file of Grade xii/Class 12 Physics Exam Question paper Class 12 of 2080-2023 that is only for general stream student whose first two digits of registration number starts from 78 and 79. The subject code of Class 12 Physics for general stream student is 1021 ‘Q’. Enjoy!
Physics Exam Question Paper Class 12 of 2080-2023.
NATIONAL EXAMINATIONS BOARD [NEB]
Physics
Grade XII-Class 12
Examination – 2080 (2023)
(New Course)
Subject Code: 1021 ‘Q’
Time – 3 hrs
Full Marks – 75
(For general stream student whose first two digits of registration number starts
from 78 and 79)
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Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.
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Physics Exam Question Paper Class 12 of 2080-2023 (New Course) | PDF Download.
Attempt all the questions.
Group ‘A’
Rewrite the correct options of each questions in your answer sheet. 11×1=11
1. Which quantity in rotational motion is analogous to force in linear motion ?
(A) Torque
(B) Moment of inertia
(C) Angular velocity
(D) Angular momentum
2. A particle undergoes SHM having time period T. What is the time taken by it to move from mean position to half of amplitude ?
(A) T/2
(B) T/3
(C) T/6
(D) T/12
3. Two capillary tubes A and B of radii 2mm and 4 mm are dipped in the same liquid. What is the ratio of heights through which liquid rises in the tubes A and B ?
(A) 1:2
(B) 2:1
(C) 1:4
(D) 4:1
4. An ideal liquid is taken though series of changes represented in diagram. The work done by the gas at the end of cycle is
(A) P1V1
(B) 5P1V1
(C) 10P1V1
(D) Zero
5. A Carnot engine is working between 300K and 600K has output 200J. What is the energy supplied to the engine ?
(A) 400J
(B) 800J
(C) 1200J
(D) 1600J
6. The frequency of tunning for is 384Hz and velocity of sound in air is 352m/s. How far the sound has transversed while fork complete 36 vibrations ?
(A) 33m
(B) 36m
(C) 352m
(D) 72m
7. A ray of light strikes a glass plate at an angle of incidence 600. If the reflected and refracted rays are perpendicular to each other in interface, what is the refractive index of glass ?
(A) 1/root 3
(B)root 3/2
(C)2/root 3
(D) root 3
8. Which of the following is the phenomenon of production of emf by maintaining a difference of temperature between two junctions of dissimilar metals ?
(A) Joule’s effect
(B) Seebeck effect
(C) Peltier effect
(D) Thomson’s effect
9. What happens to the susceptibility of ferromagnetic substance if temperature is decreased ?
(A) Increases
(B) Decreases
(C) Remains same
(D) May increase or decrease
10. What is the induced emf in a coil if the flux associated with it changes at the rate of 1 Weber per minute ?
(a) 1 Volt
(b) 1/60 Volt
(c) 60 Volt
(d) Zero
11. Which of the earth quake waves is first recorded on the seismograph ?
(a) P-waves
(b) Rayleigh Waves
(c) S-Waves
(d) Love Waves
Group ‘B’
Short answer questions. 8×5=40
12. a) Define angular momentum. Write its SI unit. 1+1
b) The speed of a motor engine decreases from 900 rev/min. to 600rev/ min. in 10 seconds.
Calculate : 3
i) The angular acceleration
ii) Number of revolutions made by the motor during this interval
iii) How many additional seconds are required for motor to come to rest in the same rate
OR
a) For a simple pendulum, show that the acceleration is directly proportional to the displacement of bob from its mean position. 2
b) A bob of mass 8kg performs SHM of amplitude 30cm. The restoring force is 60N. Calculate : 3
i) Time period
ii) The maximum acceleration
iii) Kinetic energy when displacement is 12 cm.
13. In an experiment, a spherical ball of radius ‘r’ and density ‘’ falls freely through the glycerin of density ‘’, as shown in figure.
a) Write the components of forces acting on the body by drawing free body diagram. 1
b) Sketch a graph by showing the nature of variation of velocity of ball with time. 1
c) If this drop soon attains constant downward velocity then find its expression. 3
14. a) What is meant by entropy ? Write the first law of thermodynamics in terms of entropy. 1+1
b) Can a room be cooled by leaving the door of an electric refrigerator open ? Justify. 1
c) A quantity of monoatomic gas at 300C is compressed suddenly to 8/27 th parts of its initial volume. Find the change in temperature
assuming =CP/CV to be 5/3. 2
15. a) In Youngs double slits experiment, what changes will you observe in fringe width for the following operations :
i) When experiment is shifted from air to inside water 1
ii) When slits width is increased ? 1
b) i) What is diffraction of light ? 1
ii) Calculate the width of central diffraction peak on a screen 4m behind a 0.01m slit illuminated by 600nm light source. 2
OR
a) How can a spherical wave front be changed into plane wavefront ? Draw a diagram to justify your answer. 2
b) Apply Huygen’s principle to verify the law of reflection of light. 3
16. a) State and explain Bohr’s postulates of an atomic model. 2
b) i) Calculate the de-Broglie wavelength of a neutron having kinetic energy 150eV. 2
ii) A proton and an electron have same K.E. which one has greater de-Broglie wavelength ? 1
Continue …
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