# 12th Class Physics Guess Paper 2021 - 2nd Year

If you are looking for 2nd year physics guess paper then here we have shared the paper. it includes short questions and important long questions

## 2nd Year Physics SHORT QUESTIONS

1. Electric lines of force never cross. Why?
2. State Kirchhoff’s First Rule.
3. Prove that: t = RC What are Thermisters? Explain.
4. Do electrons tend to go to the region of high potential or of low potential?
5. Why does the resistance of a conductor rise with temperature?
6. How can you identify which plate of the capacitor is positively charged?
7. What are the difficulties in testing whether the filament of a lighted bulb obeys Ohm’s law?
8. The potential is constant in space, is the electric field zero or non-zero in this region?
9. Do bends in a wire affect its electrical resistance? Explain.
10. State Gauss’s Law. Write its mathematical form. Define the Lorentz force.
11. State Coulomb’s Law. Define magnetic field strength.
12. Define Electric Field Lines. Write its two properties.
13. Describe a circuit that will give a continuously varying potential.
14. Define resistivity; write formula, unit, and its dependence.
15. Is the filament lower or higher in a 500 W, 220 V
16. light bulb than in a 100 W, 220 V bulb?
17. State Ampere’s circuital law. Define magnetic flux and write its formula?
18. If a charged particle moves linearly in space, can you say that the magnetic field in the region is zero?
19. Why is there no work done by the magnetic force that acts on the charge q, moving with velocity v?
20. Write the right-hand rule for the current carrying conductor in a uniform magnetic field.
21. Write the formula for force on a moving charge in a magnetic field and explain it.
22. Why the voltmeter should have very high resistance?
23. Why the resistance of an ammeter should be very low?
24. What is meant by AVO-meter? Define dead beat galvanometer.
25. How can you use a magnetic field to separate isotopes of a chemical element?
26. How can a current loop be used to determine the presence of the magnetic field in a given space?
27. Why does the picture on a TV screen become distorted when a magnet is brought near the screen?
28. Is it possible to orient a current loop in a uniform magnetic field so that loop will not rotate? Explain?
29. Does the induced emf always act to decrease the magnetic flux through a circuit?
30. Explain the conditions under which electromagnetic waves are produced from the source?
31. Do the induced emf and induced current in a circuit depends on the resistance of the circuit?
32. Can a D.C. motor be turned into a D.C generator? Explain.
33. Can a step-up transformer increase the power level?
34. State Faraday’s law, write the formula.
35. What is a D.C. generator? Show that ɛ and Δф/Δt have the same units.
36. What is meant by A.M. and F.M.? Define and explain choke.
37. Define self-inductance, write the formula. Write a short note on superconductors.
38. In an R-L circuit, will the current lag or lead the voltage? Explain vectorially.
40. A sinusoidal current has an RMS value of 10A. What is the maximum or peak value?
41. How does doubling the frequency affect the reactance of (a) an inductor (b) a capacitor?
42. How many times per second will an incandescent lamp reaches maximum brilliance when connected to a 50 Hz source?
43. Discuss the electrical conduction by holes and electrons in a pure semiconductor element.
44. Differentiate between crystalline and amorphous solids.
45. What is meant by hysteresis loss? How it is used
46. in the construction of a transformer?
47. What is meant by strain energy? Write its formula.
48. Distinguish between intrinsic and extrinsic semi-conductors.
49. Define stress and strain. Why ordinary silicon diodes do not emit light?
50. Define the modulus of elasticity and write its three types.
51. What is the net charge on an n-type or a p-type substance?
52. Why is the base current in a transistor very small Write a note on the NAND gate?
53. Why a photodiode is operated in a reverse biased state?
54. Why charge carriers are not present in the depletion region?
55. What is the principle of the virtual ground? Apply it to find the gain of an inverting amplifier.
56. What is the effect of forward and reverse biasing of a diode on the width of the depletion region?
57. What are the measurements on which two observers in relative motion will always agree upon?
58. Which photon, red, green, or blue carries the most (a) energy and (b) momentum?
59. Which has the lower energy quanta? Radio waves or X-rays
60. What happens to the total radiation from a block body if its absolute temperature is doubled?
61. Define the frame of reference. State uncertainty principle.
62. As a solid is heated and begins to glow, why do We do not notice the de Broglie wavelength for it first appears red? pitched cricket ball. Explain why?
63. Describe the time dilation briefly. State Stefen -Boltzmann law.
64. Can pair production take place in a vacuum? Explain.
65. When does light behave like a wave? When does it behave as a particle?
66. What advantages an electron microscope has over an optical microscope?
67. Is it possible to create a single electron from energy? Explain.
68. Why don’t we observe a Compton Effect with visible light?
69. When light shines on a surface, is momentum transferred to the metal surface?
70. What are the advantages of lasers over ordinary light?
71. Is energy conserved when an atom emits a photon of light
72. Write two postulates of Bohr’s theory. What is meant by a line spectrum? Explain its significance.
73. What do we mean when we say that the atom is excited?
74. Explain why laser action could not occur without population inversion between atomic levels?
75. Can X-rays be reflected, refracted, diffracted, and polarized just like any other waves? Explain.
76. How can the spectrum of hydrogen contain so many lines when hydrogen contains one electron?
77. A particle that produces more ionization is less penetrating. Why?
78. What fraction of a radioactive sample decays after two half-lives have elapsed?
79. Describe a brief account of the interaction of various types of radiations with the matter.
80. What are isotopes? What do they have in common and what are their differences?
81. Why are heavy nuclei unstable? Define mass defect.
82. What is meant by radioactivity? Define the half-life.
83. Differentiate between Byron’s and hadrons. What is meant by fission chain reaction?
84. What do you understand by “background radiation”? State its two sources.
85. What factors make a fusion reaction difficult to achieve?
86. What is radioactive tracer? Describe its applications.
87. Discuss the advantages and disadvantages of nuclear power compared to the use of fossil fuel-generated power.
88. What do you mean by the term critical mass? How can radioactivity help in the treatment of
89. cancer?

## 12th Class Physics EXTENSIVE QUESTIONS

1. Capacitor, Its Capacitance, Energy Stored in Capacitor and Energy density.
2. Electric Field intensity due to an infinite sheet of charge. Imp.
3. Millikan’s Oil drop method
4. Electric Potential due to a point charge
5. Wheatstone bridge, Its Construction, and working Most Imp.
6. Potentiometer as Potential divider and measuring of emf of the cell. Imp.
7. Resistivity and derivation for co-efficient of temperature.
8. Ampere’s law and derivation for Relation B= for the solenoid.
9. CRO, its construction, Working and uses
10. Galvanometer, its conversion into ammeter and voltmeter, Principle, construction and working of moving coil of the galvanometer. Most Imp.
11. e/m of the electron by the magnetic field
12. Force on a charged particle moving in the magnetic field.
13. Lenz’s law
14. Energy Stored in an Inductor Imp.
15. R-C and R-L Series Circuit/Series Resonance circuit, Expression for impedance and properties Most Imp.
16. R-L-C series resonance circuit and its properties.
17. Extrinsic and intrinsic Properties of solids and P-Type and n-type substances. Most. Imp.
18. Magnetic properties of solids.
19. Energy band theory and distinguish b/w conductors, insulators, and semiconductors on the
basis of this theory.
20. Strain energy and its derivation.
21. Rectification. Half/full-wave rectification.
22. Inverting/ non-inverting amplifier.
23. Amplifier/ Operational amplifier as inverting amplifier Imp.
24. Transistor as Amplifier and relation for voltage gain Imp.
25. Photoelectric effect/ effect of frequency and Einstein’s equation derivation. Imp.
26. Davison and Germer experiment for the wave nature of particles./ Heisenberg uncertainty
principle
27. Black body radiations/effect of temperature and energy distribution curve Imp.
28. Spectroscopy and derivation for radii of quantized orbit./ Bohr’s model of hydrogen
atom/Balmer Series
29. Characteristic / Continuous X-Ray spectra, their production, Inner shell Transition, and uses of X-rays Most Imp.
30. LASER, its principle and Laser action in detail / He-Ne Laser
31. Spectrograph and separation of isotopes Imp.
32. Mass defect and binding energy.
33. Nuclear Reactor and its parts.
34. G.M Counter, Construction and uses

## 12th Class Physics NUMERICAL PROBLEMS

1. CHAPTER#12 12.7 (Most Imp.),12.12,12.13 EXAMPLE#12.3(Short Question),12.4 (most imp.
2. Short Question),12.5
3. CHAPTER#13 13.1,13.2,13.4 (Most Imp.),13.5,13.7 EXAMPLE#13.1,13.2 (Short Question),13.3(Short Question)
4. CHAPTER#14 14.1(Imp.), 14.4,14.5,14.7, 14.9 EXAMPLE#14.1,14.3,14.5
5. CHAPTER#15 15.4,15.5,15.11 (Imp.),15.13,15.14,15.17,15.18 EXAMPLE#15.1,15.5 (Imp.)
6. CHAPTER#16 16.3,16.6,16.7,16.8,16.9 EXAMPLE#16.2,16.3 (Short Question),16.4(Short Question),16.7 (Most Imp.)
7. CHAPTER#17 17.1 (Imp.), 17.2 (Most Imp.),17.4,17.5
8. CHAPTER#18 18.1 (Most Imp.),18.5 EXAMPLE#18.1 (Short Question)
9. CHAPTER#19 19.5,19.7,19.9,19.10 EXAMPLE#19.5,19.7,19.8 (Most Imp.),19.9.19.10,19.11
10. CHAPTER#20 20.2,20.3,20.4,20.5,20.6,20.7,20.9 EXAMPLE#20.1
11. CHAPTER#21 21.1,21.2,21.9,21.10 EXAMPLE#21.1,21.3

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