II PUC Annual Examination, March - 2014
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. Write the SI unit of charge.
2. Define mobility of electron.
3. What is the nature of force between two parallel conductors carrying currents of same direction?
4. Draw the pattern of magnetic field lines for a bar magnet.
5. Give the expression for energy stored in an inductance coil carrying current.
6. How is r.m.s voltage of a. c related to peak value of a c voltage?
7. What is wavefront of light waves?
8. State the radioactive decay law.
9. Write the truth table of logic OR gate.
10. Give the bandwidth of TV signal for transmission.
1. Write the SI unit of charge.
2. Define mobility of electron.
3. What is the nature of force between two parallel conductors carrying currents of same direction?
4. Draw the pattern of magnetic field lines for a bar magnet.
5. Give the expression for energy stored in an inductance coil carrying current.
6. How is r.m.s voltage of a. c related to peak value of a c voltage?
7. What is wavefront of light waves?
8. State the radioactive decay law.
9. Write the truth table of logic OR gate.
10. Give the bandwidth of TV signal for transmission.
PART – B
II. Answer any FIVE of the following questions. 5×2=10
11. State and explain Coulomb’s law in electrostatics.
12. Draw Wheatstone’s bridge circuit and write the condition for its balance.
13. What is magnetic susceptibility? For which material is it low and positive?
14. Mention any two advantages of eddy currents in practical applications.
15. Who predicted the existence of electromagnetic waves? Give the wavelength range of electromagnetic spectrum.
16. Explain Malus law for polaroids.
17. Write any two types of electron emission.
18. Why there is need for modulation?
11. State and explain Coulomb’s law in electrostatics.
12. Draw Wheatstone’s bridge circuit and write the condition for its balance.
13. What is magnetic susceptibility? For which material is it low and positive?
14. Mention any two advantages of eddy currents in practical applications.
15. Who predicted the existence of electromagnetic waves? Give the wavelength range of electromagnetic spectrum.
16. Explain Malus law for polaroids.
17. Write any two types of electron emission.
18. Why there is need for modulation?
PART – C
III. Answer any five of the following questions. 5×3=15
19. Derive an expression for potential energy of a system of two charges in the absence of the external electric field.
20. Write three uses of cyclotron.
21. What are
i) Magnetic declination
ii) Magnetic dip
iii) Horizontal component of earth’s magnetic fields at a place?
22. State and explain Lenz’s law for induced e. m. f.
23. Explain the construction of transformer. Mention its principle.
24. Mention three applications of total internal reflection of light.
25. Give three characteristics of photon.
26. How is Zener diode used as voltage regulator?
19. Derive an expression for potential energy of a system of two charges in the absence of the external electric field.
20. Write three uses of cyclotron.
21. What are
i) Magnetic declination
ii) Magnetic dip
iii) Horizontal component of earth’s magnetic fields at a place?
22. State and explain Lenz’s law for induced e. m. f.
23. Explain the construction of transformer. Mention its principle.
24. Mention three applications of total internal reflection of light.
25. Give three characteristics of photon.
26. How is Zener diode used as voltage regulator?
PART – D
IV. Answer any two of the following questions. 2×5=10
27. State Gauss law in electrostatics. Using the law derive an expression for electric fields due to a uniformly charged thin spherical shell at a point outside the shell.
28. With the help of a circuit diagram. Obtain the expression for equivalent resistance of two resistors connected in parallel.
29. Derive the expression for magnetic field at a point on the axis of a circular current loop.
V. Answer any two of the following questions. 2×5=10
30. Obtain the expression for fringe width in the case of interference of light waves.
31. Write three postulates of Bohr. Mention two limitations of Bohr’s model.
32. Explain the formation of energy bands in solids. On the basis of energy bands distinguish between a metal, a semiconductor and an insulator.
V. Answer any three of the following questions. 3×5=15
33. In a parallel plate capacitor with air between the plates. Each plate has an area of
and the distance between the plates is 3mm. calculate the capacitance of the capacitor. If this capacitor is connected to a 100V supply. What is the charge on each plate of the capacitor?
[Absolute permittivity of free space=
]
34. A battery of internal resistance 3Ω is connected to 20 Ω resistor and potential difference across the resistor is 10 V. if another resistor of 30Ω is connected in series with the first resistor and battery is again connected to the combination calculate the e. m. f and terminal potential difference across the combination.
35. Calculate resonant frequency and Q- factor of a series L-C-R circuit containing a pure inductor of inductance 3 H, capacitor of capacitance 27μF and resistor of resistance 7.4Ω.
36. Two lenses of focal lengths 0.20m and 0.30m are kept in contact. Find the focal length of the combination. Calculate powers of two lenses and combination.
37. Calculate the binding energy and binding energy per nucleon (in MeV) of a nitrogen nucleus (
) from the following data.
Mass of proton= 1.00783 ɥ
Mass of neutron= 1.00867É¥
Mass of nitrogen nucleus= 14.00307 ɥ
27. State Gauss law in electrostatics. Using the law derive an expression for electric fields due to a uniformly charged thin spherical shell at a point outside the shell.
28. With the help of a circuit diagram. Obtain the expression for equivalent resistance of two resistors connected in parallel.
29. Derive the expression for magnetic field at a point on the axis of a circular current loop.
V. Answer any two of the following questions. 2×5=10
30. Obtain the expression for fringe width in the case of interference of light waves.
31. Write three postulates of Bohr. Mention two limitations of Bohr’s model.
32. Explain the formation of energy bands in solids. On the basis of energy bands distinguish between a metal, a semiconductor and an insulator.
V. Answer any three of the following questions. 3×5=15
33. In a parallel plate capacitor with air between the plates. Each plate has an area of
[Absolute permittivity of free space=
34. A battery of internal resistance 3Ω is connected to 20 Ω resistor and potential difference across the resistor is 10 V. if another resistor of 30Ω is connected in series with the first resistor and battery is again connected to the combination calculate the e. m. f and terminal potential difference across the combination.
35. Calculate resonant frequency and Q- factor of a series L-C-R circuit containing a pure inductor of inductance 3 H, capacitor of capacitance 27μF and resistor of resistance 7.4Ω.
36. Two lenses of focal lengths 0.20m and 0.30m are kept in contact. Find the focal length of the combination. Calculate powers of two lenses and combination.
37. Calculate the binding energy and binding energy per nucleon (in MeV) of a nitrogen nucleus (
Mass of proton= 1.00783 ɥ
Mass of neutron= 1.00867É¥
Mass of nitrogen nucleus= 14.00307 ɥ
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