II PUC Annual Examination, March - 2017
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 Coulomb’s law.
2. Define mobility of electron.
3. What is the significance of Lenz’s law?
4. Define displacement current.
5. Write one application of microwave.
6. How the power of a lens is related to its focal length?
7. Write the expression for de-Broglie wavelength of a particle.
8. Write the conclusion of Davisson-Germer experiment on the nature of electron?
9. Write the SI unit of activity.
10. What is transducer in communication system?
1. State Coulomb’s law.
2. Define mobility of electron.
3. What is the significance of Lenz’s law?
4. Define displacement current.
5. Write one application of microwave.
6. How the power of a lens is related to its focal length?
7. Write the expression for de-Broglie wavelength of a particle.
8. Write the conclusion of Davisson-Germer experiment on the nature of electron?
9. Write the SI unit of activity.
10. What is transducer in communication system?
PART – B
II. Answer any FIVE of the following questions. 5×2=10
11. Write any two properties of electric field lines.
12. On what factors does the capacitance of a parallel plate capacitors depends?
13. State and explain Ohm’s law.
14. Define the terms:
i) Declination
ii) Inclination or dip.
15. State and explain Faraday’s law of electromagnetic induction.
16. Name the type of lens which is used to correct
i) Myopia
ii) Hypermetropia.
17. What is NAND gate? Give its logic symbol.
18. Draw the block diagram of a AM receiver.
11. Write any two properties of electric field lines.
12. On what factors does the capacitance of a parallel plate capacitors depends?
13. State and explain Ohm’s law.
14. Define the terms:
i) Declination
ii) Inclination or dip.
15. State and explain Faraday’s law of electromagnetic induction.
16. Name the type of lens which is used to correct
i) Myopia
ii) Hypermetropia.
17. What is NAND gate? Give its logic symbol.
18. Draw the block diagram of a AM receiver.
PART – C
III. Answer any five of the following questions. 5×3=15
19. Derive the relation between electric field and electric potential due a point charge.
20. Derive the expression for energy stored in a charged capacitor.
21. Explain with circuit diagram how to convert galvanometer into a voltmeter.
22. Derive the expression for motional emf induced in a conductor moving in a uniform magnetic field.
23. What is transformer? Mention two sources of energy loss in a transformer.
24. Mention any three applications of polaroids.
25. Write any three experimental observations of photoelectric effect.
26. Give any three differences between n-type and p-type semiconductors.
19. Derive the relation between electric field and electric potential due a point charge.
20. Derive the expression for energy stored in a charged capacitor.
21. Explain with circuit diagram how to convert galvanometer into a voltmeter.
22. Derive the expression for motional emf induced in a conductor moving in a uniform magnetic field.
23. What is transformer? Mention two sources of energy loss in a transformer.
24. Mention any three applications of polaroids.
25. Write any three experimental observations of photoelectric effect.
26. Give any three differences between n-type and p-type semiconductors.
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 the expression for magnetic field at a point on the axis of a circular current loop.
29. Write any five properties of ferromagnetic materials.
V. Answer any two of the following questions. 2×5=10
30. Derive Lens maker’s formula for a convex lens.
31. State radioactive decay law. Derive $\displaystyle N=N_{0}e^{-\lambda t}$ for a radioactive element.
32. What is rectification? With relevant circuit diagram and waveforms explain the working of p-n junction diode as a full wave rectifier.
V. Answer any three of the following questions. 3×5=15
33. Two point charges $\displaystyle q_{a}=3\mu C$ and $\displaystyle q_{b}=-3\mu C$ are located 20 cm apart in vacuum.
a) What is the electric field at the midpoint O of the line AB joining the two charges?
b) If a negative test charge of magnitude $\displaystyle 1.5\times 10^{-9}C$ is placed at this point. What is the force experienced by the test charge?
34. When two resistors are connected in series with a cell of emf 2V and negligible internal resistance, a current of $\displaystyle \frac{2}{5}A$ flows in the circuit. When the resistors are connected in parallel the main current is $\displaystyle \frac{5}{3}A$. Calculate the resistances.
35. A source of alternating emf of 220V-50Hz is connected in series with a resistance of 200Ω an inductance of 100mH and a capacitance of 30𝜇F. Does the current lead or lag the voltage and by what angle?
36. Light of wave length $\displaystyle 6000A^{0}$ is used to obtain interference fringes of width 6mm in a Young’s double slit experiment. Calculate the wave length of light required to obtain fringe of width 4mm when the distance between the screen and slits is reduced to half of its initial value.
37. The first member of the Balmer series of hydrogen atom has wavelength of $\displaystyle 6563A^{0}$. Calculate the wavelength and frequency of the second member of the same series.
Given: $\displaystyle C=3\times 10^{8} ms^{-1}$
27. Deduce the condition for balance of a Wheatstone’s bridge using Kirchhoff’s rules.
28. Derive the expression for magnetic field at a point on the axis of a circular current loop.
29. Write any five properties of ferromagnetic materials.
V. Answer any two of the following questions. 2×5=10
30. Derive Lens maker’s formula for a convex lens.
31. State radioactive decay law. Derive $\displaystyle N=N_{0}e^{-\lambda t}$ for a radioactive element.
32. What is rectification? With relevant circuit diagram and waveforms explain the working of p-n junction diode as a full wave rectifier.
V. Answer any three of the following questions. 3×5=15
33. Two point charges $\displaystyle q_{a}=3\mu C$ and $\displaystyle q_{b}=-3\mu C$ are located 20 cm apart in vacuum.
a) What is the electric field at the midpoint O of the line AB joining the two charges?
b) If a negative test charge of magnitude $\displaystyle 1.5\times 10^{-9}C$ is placed at this point. What is the force experienced by the test charge?
34. When two resistors are connected in series with a cell of emf 2V and negligible internal resistance, a current of $\displaystyle \frac{2}{5}A$ flows in the circuit. When the resistors are connected in parallel the main current is $\displaystyle \frac{5}{3}A$. Calculate the resistances.
35. A source of alternating emf of 220V-50Hz is connected in series with a resistance of 200Ω an inductance of 100mH and a capacitance of 30𝜇F. Does the current lead or lag the voltage and by what angle?
36. Light of wave length $\displaystyle 6000A^{0}$ is used to obtain interference fringes of width 6mm in a Young’s double slit experiment. Calculate the wave length of light required to obtain fringe of width 4mm when the distance between the screen and slits is reduced to half of its initial value.
37. The first member of the Balmer series of hydrogen atom has wavelength of $\displaystyle 6563A^{0}$. Calculate the wavelength and frequency of the second member of the same series.
Given: $\displaystyle C=3\times 10^{8} ms^{-1}$
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