NEB Class 12 Physics Grade Increment (Supplementary) Exam Paper 2080

Today, I’m going to provide you NEB Class 12 Physics Grade Increment (Supplementary) Exam Paper 2080 with subject code – 1021 ‘A’ which examination was held on the year 2080/2023 and you can download the neb grade xii (12) Physics subject grade increment (supplementary) exam question paper of the year 2080-2023 in PDF format. Please check and download pdf file grade 12 Physics Exam question paper of the year 2023-2080 Nepal. The Exam Question provided below – NEB Class 12 Physics Grade Increment (Supplementary) Exam Paper 2080 for the board exam 2079 and onwards. And it is based on the latest NEB Syllabus for 2079 and so on. We will be adding more Exam Question Papers of grade xii- class 12 later on. Scroll down to Download NEB Class 12 Physics Grade Increment (Supplementary) Exam Paper 2080 Sub. Code: 1021’A’ in pdf format which is 2.15 mb in size. Enjoy!

NEB Class 12 Physics Grade Increment (Supplementary) Exam Paper 2080.

NATIONAL EXAMINATIONS BOARD [NEB]
Physics
Grade XII-Class 12
Grade Increment (Supplementary)
Examination – 2080 (2023)
(New Course)
Subject Code: 1021 ‘A’
Time – 3 hrs
Full Marks – 75

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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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Attempt all the questions.

Group – ‘A’

Rewrite the correct options of each questions in your answer sheet. 11xl=11

1. The moment of inertia of a body of mass M about a given axis is I. What is the radius of gyration ?

(A) I/M (B) IM (C) √I/M (D) √IM

2. The maximum velocity and maximum acceleration of a particle executing SHM are 4 mis and 2 m/s2 respectively. It’s time period of oscillation is

(A) π/2 sec (B) 2π sec (C) 2/π sec (D) 4π sec

3. A spherical ball is dropped into a long column of a viscous liquid. The speed (v) of the ball as a function of time (t) may be best represented by

4. In which of the following processes of the gas, work done is the maximum ?

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

5. When the door of a refrigerator is left open in a room, the temperature of the room.

(A) Increases (B) Decreases (C) Remains same (D) First increases, then decreases

6. Distance between two consecutive nodes in a standing wave is

(A) A.       (B) A./2        (C) A./4        (D) 2A.

7. The critical angle of a certain medium is sin-1 (3/5). Then the polarizing angle of the medium will be

(A) tan-1 (4/3) (B) tan-1 (3/4) (C) tan-1 (3/5) (D) tan-1 (5/3)

8. The value of magnetizing field (H) when magnetic flux density equals to zero (B=O) is called

(A) Retentivity (B) Hysteresis (C) Coercivity (D) Curie’s temperature

9. In our country, the supply of a.c. voltage is 220 V. The peak voltage is

(A) 310 V (B) 110 V (C) 220 V (D) 350 V

10. A long solenoid carrying a current produces a magnetic feild ‘B’ along its axis. If the current is doubled and the number of turns per cm is halved, then new value of magnetic field is

(A) B (A) 2B (C) B/2 (D) 4B

11. Which of the following earthquake waves is first recorded on the seismograph ?

(A) S-waves (C) Love waves (B) P-waves (D) Rayleigh waves

Group ‘B’

Short answer questions: 8X5=40

12. a) Define simple harmonic motion . 1

b) Derive an expression for total mechanical energy of a particle executing simple harmonic motion. 3

c) Show graphically, how the kinetic energy, potential  energy and total energy of the particle vary with displacement from its equilibrium position. 1

13. a) What is meant by surface energy of a liquid ? Write its relation with surface tension of the liquid. 2

b) An air bubble of radius 1 cm is rising at a steady rate of 5 mm/s. through a liquid of density 0.8g/cm3• Calculate the coefficient of viscosity of the liquid. (Neglect the density of air)  3

14. a) Draw a PV diagram of a petrol engine and explain its working based on the PV diagram.  3

b) Why is Cp always greater than Cv ? Explain.  2

15. a) What is Doppler’s effect ? Calculate the apparent frequency when a source moves towards a stationary observer. 1+2

b) Why sound waves are also called pressure waves ? Explain. 2

16. a)   State Lenz law in electromagnetism . Does this law violet the principle of conservation of energy ? Explain.  3

b)   In figure, a magnet is moving towards one end of a solenoid connected to a sensitive galvanometer. During this movement, a current is induced in the solenoid .Does the direction of induced current change if the magnet is moved away from the solenoid ? Explain.  2

17. a) Define one Ampere of current in terms of the force between two parallel current carrying conductors. 1

b) How do you explain the contraction of the solenoidal coil while the current is passed through it ? 1

c) A horizontal straight wire of mass 0.12 gm and length 10 cm is placed perpendicular to a uniform horizontal magnetic field of flux density 0.6 T. If the resistance per unit length of the wire is 3.8 n m·1, calculate the potential difference that has to be applied between the ends of the wire to make it just self-supporting. 3

OR

a) What do you mean by Seebeck effect ? 1

b) Explain the variation of thermo-emf with temperature of junction. 2

c) In a given thermo-couple the temperature of cold junction is 25°C while the neutral temperature is 270°C. What is the value of temperature of inversion ? 2

18. a) What is meant by specific charge of an electron ? It’s value is constant for cathode rays but not for positive rays, why ?  2

b) A beam of electron is under the effect of potential difference l .36x 104 volt applied across two parallel plates 4 cm apart and a magnetic field of 2x 10-3 wb/m2 at right angles to each other.

i)  Calculate velocity of electrons if the two fields produce no deflection in the beam. 1
ii) What will be the radius of the orbit in which the beam will move if the electric field is made zero ?  2

19. a) Define the terms :half life and decay constant of a radio active substance. 2

b) In a given sample, two radio isotopes A and B are initially present in the ratio of 1:4. The half-lives of A and B are 100 years and 50 years respectively. Find the time after which the amounts of A and B become equal.  3

OR

a) What characteristic of a junction diode is used in rectification ? 1
b) Explain the working of junction diode as full wave rectifier. 2
c) The output of two-input AND gate is fed to a NOT gate. Give its logic symbol and construct its truth table.  2

Group ‘C’

Long answer questions:  3×8=24

20. a)  What is the significance of the negative energy of the electron in an orbit? 1

b) The diagram shows the lowest four discrete energy levels of an atom.

…

NEB Class 12 Physics Grade Increment (Supplementary) Exam Paper 2080

View and Download NEB Class 12 Physics Grade Increment (Supplementary) Exam Paper 2080 Code-1021’A’ – Images.