II PUC Annual Examination, March - 2016
Time: 3:15 Hours Subject: Physics (33) Max. Marks: 70
Instructions:
1. All parts are compulsory
2. Answer without relevant diagram/figure/ circuit wherever necessary will not carry any marks.
3. Numerical problems solved without writing the relevant formulae carry no marks.
1. All parts are compulsory
2. Answer without relevant diagram/figure/ circuit wherever necessary will not carry any marks.
3. Numerical problems solved without writing the relevant formulae carry no marks.
PART – A
I. Answer all the following questions. 10×1=10
1. State Faraday’s law of electromagnetic induction.
2. Write an expression for the displacement current.
3. What is an electric dipole?
4. Draw the circuit symbol of p-n-p transistor.
5. How can the resolving power of a telescope be increased?
6. In the following nuclear reaction, identify the particle X.
$\displaystyle n\to p+e^{-}+x$
7. Define magnetisation of a sample.
8. How does the power of a lens vary with its focal length?
9. What is a cyclotron?
10. Give the wavelength range of X-rays.
1. State Faraday’s law of electromagnetic induction.
2. Write an expression for the displacement current.
3. What is an electric dipole?
4. Draw the circuit symbol of p-n-p transistor.
5. How can the resolving power of a telescope be increased?
6. In the following nuclear reaction, identify the particle X.
$\displaystyle n\to p+e^{-}+x$
7. Define magnetisation of a sample.
8. How does the power of a lens vary with its focal length?
9. What is a cyclotron?
10. Give the wavelength range of X-rays.
PART – B
II. Answer any FIVE of the following questions. 5×2=10
11. The current in a coil of self-inductance 5mH changes from 2.5A to 2.0 A in 0.01 second. Calculate the value of self-induced emf.
12. What is a toroid? Mention an expression for magnetic field at a point inside a toroid.
13. What are isotopes and isobars?
14. Draw the variation of magnetic field (B) with magnetic intensity (H) when a ferromagnetic material is subjected to a cycle of magnetisation.
15. Mention two applications of polaroids.
16. Write the logic symbol and truth table of NAND gate.
17. Write two properties of electric field lines.
18. What is myopia? How to correct it?
11. The current in a coil of self-inductance 5mH changes from 2.5A to 2.0 A in 0.01 second. Calculate the value of self-induced emf.
12. What is a toroid? Mention an expression for magnetic field at a point inside a toroid.
13. What are isotopes and isobars?
14. Draw the variation of magnetic field (B) with magnetic intensity (H) when a ferromagnetic material is subjected to a cycle of magnetisation.
15. Mention two applications of polaroids.
16. Write the logic symbol and truth table of NAND gate.
17. Write two properties of electric field lines.
18. What is myopia? How to correct it?
PART – C
III. Answer any five of the following questions. 5×3=15
19. What is transformer? Mention two sources of energy loss in a transformer.
20. Write three characteristics of nuclear forces.
21. Derive the expression for energy stored in a charged capacitor.
22. What is an amplifier? Draw the simple circuit of transistor amplifier in CE mode.
23. Mention the types of transmission media.
24. Derive an expression for drift velocity of free electrons in a conductor.
25. Explain briefly the coil and magnet experiment to demonstrate electromagnetic induction.
26. Write three properties of ferromagnetic materials.
19. What is transformer? Mention two sources of energy loss in a transformer.
20. Write three characteristics of nuclear forces.
21. Derive the expression for energy stored in a charged capacitor.
22. What is an amplifier? Draw the simple circuit of transistor amplifier in CE mode.
23. Mention the types of transmission media.
24. Derive an expression for drift velocity of free electrons in a conductor.
25. Explain briefly the coil and magnet experiment to demonstrate electromagnetic induction.
26. Write three properties of ferromagnetic materials.
PART – D
IV. Answer any two of the following questions. 2×5=10
27. Deduce the condition for balance of a Wheatstone’s bridge using Kirchhoff’s rules.
28. Derive an expression for the force between two parallel conductors carrying currents. Hence define ampere.
29. Derive the expression for electric field due to an electric dipole at a point on the axial line.
V. Answer any two of the following questions. 2×5=10
30. Write the experimental observations of Photoelectric effect.
31. What is rectification? With relevant circuit diagram and waveforms explain the working of P-N junction diode as a full-wave rectifier.
32. Derive an expression for equivalent focal length of two thin lenses kept in contact.
V. Answer any three of the following questions. 3×5=15
33. In Young’s double slit experiment, fringes of certain width are produced on the screen kept at a certain distance from the slits. When the screen is moved away from the slits by 0.1m, fringe width increases by $\displaystyle 6\times 10^{-5}$ m. this separation between the slits is 1mm. Calculate the wavelength of the light used.
34. When two capacitors are connected in series and connected across 4kV line, the energy stored in the system is 8J. The same capacitors, if connected in parallel across the same line, the energy stored is 36J. Find the individual capacitances.
35. Calculate the shortest and longest wavelengths of Balmer series of hydrogen atom. Given $\displaystyle R=1.097\times 10^{7}m^{-1}$
36. Calculate the resonant frequency and Q-factor (Quality factor) of a series L-C-R circuit containing a pure inductor of inductance 4 H, capacitor of capacitance 27μ and resistor of resistance 8.4Ω.
37. a) Three resistors of resistances 2Ω, 3Ω and 4Ω are combined in series. What is the total resistance of the combination?
b) If this combination is connected to a battery of emf 10V and negligible internal resistance, obtain the potential drop across each resistor.
27. Deduce the condition for balance of a Wheatstone’s bridge using Kirchhoff’s rules.
28. Derive an expression for the force between two parallel conductors carrying currents. Hence define ampere.
29. Derive the expression for electric field due to an electric dipole at a point on the axial line.
V. Answer any two of the following questions. 2×5=10
30. Write the experimental observations of Photoelectric effect.
31. What is rectification? With relevant circuit diagram and waveforms explain the working of P-N junction diode as a full-wave rectifier.
32. Derive an expression for equivalent focal length of two thin lenses kept in contact.
V. Answer any three of the following questions. 3×5=15
33. In Young’s double slit experiment, fringes of certain width are produced on the screen kept at a certain distance from the slits. When the screen is moved away from the slits by 0.1m, fringe width increases by $\displaystyle 6\times 10^{-5}$ m. this separation between the slits is 1mm. Calculate the wavelength of the light used.
34. When two capacitors are connected in series and connected across 4kV line, the energy stored in the system is 8J. The same capacitors, if connected in parallel across the same line, the energy stored is 36J. Find the individual capacitances.
35. Calculate the shortest and longest wavelengths of Balmer series of hydrogen atom. Given $\displaystyle R=1.097\times 10^{7}m^{-1}$
36. Calculate the resonant frequency and Q-factor (Quality factor) of a series L-C-R circuit containing a pure inductor of inductance 4 H, capacitor of capacitance 27μ and resistor of resistance 8.4Ω.
37. a) Three resistors of resistances 2Ω, 3Ω and 4Ω are combined in series. What is the total resistance of the combination?
b) If this combination is connected to a battery of emf 10V and negligible internal resistance, obtain the potential drop across each resistor.
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