Physics (Technical Stream) | NEB Class 12 Question Paper 2080-2023 | New Course | Code-9131 - PDF

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NEB Class 12 Exam Question Papers COLLECTION 2080-2023.

Repair and Maintenance of Electrical Equipments | Question Paper 2080-2023 of Class 12 NEB (Technical Stream) (Sub. Code: 664) (Old Course) | PDF Download.

History | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 256) (Old Course) | PDF Download.

Culture | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 266) (Old Course) | PDF Download.

Elements of Finance-II | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 606) (Old Course) | PDF Download.

Child Development and Learning | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 902) (Old Course) | PDF Download.

Gender Studies | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 1241) (New Course) | PDF Download.

Human Value Education | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 1321) (New Course) | PDF Download.

Psychology | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 1201) (New Course) | PDF Download.

History | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 1221'A') (New Course) | PDF Download.

Rural Development | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 1061) (New Course) | PDF Download.

Hospitality Management | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 1261'A') (New Course) | PDF Download.

Vegetable and Medicinal Plant Production | Question Paper 2080-2023 of Class 12 NEB (Technical Stream) (Sub. Code: 9251) (New Course) | PDF Download.

Switch Gear and Protection | Question Paper 2080-2023 of Class 12 NEB (Technical Stream) (Sub. Code: 9261) (New Course) | PDF Download.

Power Transmission and Distribution | Question Paper 2080-2023 of Class 12 NEB (Technical Stream) (Sub. Code: 9291) (New Course) | PDF Download.

Travel and Tourism | Question Paper 2080-2023 of Class 12 NEB (Old Course) (Sub. Code: 274) | PDF Download.

Industrial Crop Production | Question Paper 2080-2023 of Class 12 NEB (Technical Stream) (Sub. Code: 9221) (New Course) | PDF Download.

Non-ruminant Production and Management | Question Paper 2080-2023 of Class 12 NEB (Technical Stream) (Sub. Code: 9181) (New Course) | PDF Download.

General Surgery and Radiology | Question Paper 2080-2023 of Class 12 NEB (Technical Stream) (Sub. Code: 9211) (New Course) | PDF Download.

Sociology | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 272) (Old Course) | PDF Download.

Political Science | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 258) (Old Course) | PDF Download.

Maintenance and Rehabilitation of Structure | Question Paper 2080-2023 of Class 12 NEB 2080-2023 (Sub. Code: 660) (Old Course) | PDF Download.

Web Development and Database | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 656) (Old Course) | PDF Download.

Mechanics of Structure | Question Paper 2080-2023 of Class 12 NEB (Technical Stream) (Sub. Code: 9301) (New Course) | PDF Download.

Visual Programming | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 9341) (New Course) | PDF Download.

Software Engineering and Project Management | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 9371) (New Course) | PDF Download.

Social Studies And Life Skill Education (Technical) | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 9011) (New Course) | PDF Download.

Social Studies And Life Skill Education | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 0061 'H') (New Course) | PDF Download.

Physics | Question Paper 2080-2023 of Class 12 NEB (Old Course) (Sub. Code: 210) | PDF Download.

Physics | Question Paper 2080-2023 of Class 12 NEB (Technical Stream) (Sub. Code: 9131) (New Course) | PDF Download.

Optional English | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 3341) (New Course) | PDF Download.

Nepalese Legal System | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 1101) (New Course) | PDF Download.

Mathematics | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 0081 'H') (New Course) | PDF Download.

Marketing | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 910) (Old Course) | PDF Download.

Instructional Pedagogy and Evaluation | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 1181) (New Course) | PDF Download.

Instructional Evaluation | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 918) (Old Course) | PDF Download.

Hotel Management | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 270) (Old Course) | PDF Download.

General Law | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 296) (Old Course) | PDF Download.

Construction Management | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 9331) (New Course) | PDF Download.

Compulsory Nepali | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 0021 'B') (New Course) | PDF Download.

Compulsory English | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 0041D) (New Course) | PDF Download.

Business Studies | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 628) (Old Course) | PDF Download.

Business Mathematics | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 908) (Old Course) | PDF Download.

Biology | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 9101) (New Course) | PDF Download.

Accounting | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 1041'Q') (New Course) | PDF Download.

Compulsory English | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 0041'G') (New Course) | PDF Download.

Compulsory English | Question Paper 2080-2023 of Class 12 NEB (Sub. Code: 004) (Old Course) | PDF Download.

Physics (General Stream) | Question Paper 2080-2023 of Class 12 NEB (New Course) | PDF Download.

Attempt all questions.

Group 'A' [11x1=11]

Rewrite the correct options of each questions in your answer sheet.

1. Two bodies have their moment of inertia I and 2I respectively about their axis of rotation. If their kinetic energies of rotation are equal, the angular momentum will be in the ratio of

(A) 1:3
(B) √2:1
(C) 2:1
(D) 1:√3

2. The thermodynamic process in which temperature remains constant is called

(A) Isobaric
(B) Isothermal
(C) Isochoric
(D) adiabatic

3. Internal energy of real gas depends on:

(A) Volume and temperature
(B) Pressure and Temperature
(C) Volume only
(D) Temperature only

4. The distance travelled by a wave in one complete cycle is called.

(A) amplitude
(B) wavelength
(C) frequency
(D) displacement.

5. Kirchhoff's current law is based on the principle of conservation of

(A) charge
(B) mass
(C) linear momentum
(D) energy

6. The instrument used for the accurate measurement of the emf of a cell is

(A) a voltmeter
(B) a potentiometer
(C) an ammeter
(D) a slide wire bridge

7. Which of the following is ferromagnetic material ?
(A) Nickel
(B) Bismuth
(C) Aluminum
(D) Quartz

8. X-rays of wavelength 3oA have a frequency of
(A) 10 Hz
(B) 102Hz
(C) 1x104Hz
(D) 1x1018Hz

9. The dynamic mass of photon is

10. As the quantum number increases, the difference in energy between two consecutive energy levels.

(A) remain same
(B) decreases
(C) increases
(D) some times increases and sometimes decreases

11. Holes exists in

(A) metals
(B) insulators
(C) semiconductor
(D) conductor
Group 'B' 8x5=40

12.
a) Define simple harmonic motion (SHM). 1
b) Show that the motion of simple pendulum is simple harmonic for small amplitude and also find an expression for its time period. 3
c) Does the time period of a simple pendulum depend on mass of the bob ? Justify. 1

13.
a) Define viscosity. 1
b) Obtain an expression for terminal velocity of the spherical solid object falling inside the viscous liquid. 3
c) Sketch a graph between the velocity of falling spherical object with time. 1

14.
a) State Newton's formula for the velocity of sound in gases. 1
b) What correction was done by Laplace on Newton's formula ? 1
c) Derive Laplace's corrected formula for the velocity of sound. 3

15.
a) Define organ pipes. 1
b) Describe various modes of vibration of air column in a closed organ pipe. 3
c) What is end correction of an organ pipe ? 1

16.
a) What is meant by interference of light ? 1
b) Explain Brewster's law of polarization. 2
c) Find the refractive index of material for which polarizing angle is 30° 2

17.
a) State the principle of meter bridge. 1
b) Describe how it is used to determine the value of unknown resistance of wire. 3
c) What is meant by balanced condition ? 1

Or
a) Define Lorentz force with mathematical expression. 2
b) State Biot-Savart law and use it to find the magnetic field at the centre of a current carrying circular coil. 3

18.
a) How can you convert a galvanometer into a voltmeter ? Explain. 3
b) Why a voltmeter is connected in parallel in a circuit ? 2

19.
a) Show that the motion of electrons in electric field is parabolic in nature. 3
b) An electron and a proton enter in the electric field normally with the field with same velocity. Which particle path is more curved ? 2
Or
a) How p - n junction is formed ? Explain. 2
b) Describe full wave rectification by using p - n junction diodes. 3
Group 'C' 8x3=24

20.
a) What do you mean by rigid body ? 1
b) Deduce an expression for the moment of inertia of a thin and uniform rod about an axis through the center and perpendicular to its length. 4
c) A ballet dancer spins with 2.4 rev/s with her arms outstretched when the moment of inertia about an axis of rotation is I. With her arms folded, the moment of inertia about the same axis becomes 0.6 I. Calculate the new rate of spin. 3

21.
a) What do you mean by resonance in LCR circuit ? 2
b) Obtain an expression of resonating frequency in LCR series circuit ?2
c) Draw a graph showing the variation of capacitive reactance of a capacitor with the frequency of applied alternating current. 2
d) A series LCR circuit consists of R=300, L=60mH and C=0.5F. Calculate the value of resonant frequency. 2

22.
a) What is photoelectric effect ? 1
b) How stopping potential is related to kinetic energy of photoelectrons ? 2
c) Describe Millikan experiment to determine Planck's constant. 3
d) Sodium has work function of 2eV. Calculate the maximum kinetic energy of the emitted electrons when sodium is illuminated by a radiation of 150nm . 2