II PUC Annual Examination, March - 2019
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 electrical resistivity of material of a conductor.
3. Write the expression for force acting on a moving charge in a magnetic field.
4. What is magnetic susceptibility?
5. How the self-inductance of a coil depends on number of turns in the coil?
6. For which position of the object magnification of convex lens is -1(minus one)?
7. For which angle of incidence reflected ray is completely polarised?
8. Mention any one type of electron emission.
9. Write the expression for energy of an electron in electron orbit of hydrogen atom. Energy in nth Bohr orbit.
10. Write the relation between Half-life and Mean life of radioactive element.
1. State Coulomb’s law.
2. Define electrical resistivity of material of a conductor.
3. Write the expression for force acting on a moving charge in a magnetic field.
4. What is magnetic susceptibility?
5. How the self-inductance of a coil depends on number of turns in the coil?
6. For which position of the object magnification of convex lens is -1(minus one)?
7. For which angle of incidence reflected ray is completely polarised?
8. Mention any one type of electron emission.
9. Write the expression for energy of an electron in electron orbit of hydrogen atom. Energy in nth Bohr orbit.
10. Write the relation between Half-life and Mean life of radioactive element.
PART – B
II. Answer any FIVE of the following questions. 5×2=10
11. Write any two basic properties of charge.
12. Write the expression for drift velocity in terms of current, explain the terms used.
13. Define magnetic ‘dip’ and ‘declination’ at a place.
14. Write the expression for speed of light in terms of '$\displaystyle \mu _{0}$' and '$\displaystyle \epsilon _{0}$' explain the terms used.
15. Write the ray diagram for formation of image in the simple microscope.
16. What is diffraction of light?
17. Write the expression for de-Broglie wave length of electrons in terms of electric potential and explain the terms used.
18. Distinguish between n-type and p-type semiconductors.
11. Write any two basic properties of charge.
12. Write the expression for drift velocity in terms of current, explain the terms used.
13. Define magnetic ‘dip’ and ‘declination’ at a place.
14. Write the expression for speed of light in terms of '$\displaystyle \mu _{0}$' and '$\displaystyle \epsilon _{0}$' explain the terms used.
15. Write the ray diagram for formation of image in the simple microscope.
16. What is diffraction of light?
17. Write the expression for de-Broglie wave length of electrons in terms of electric potential and explain the terms used.
18. Distinguish between n-type and p-type semiconductors.
PART – C
III. Answer any five of the following questions. 5×3=15
19. Derive an expression for potential energy of electric – dipole placed in a uniform electric field.
20. Write the expression for force per unit length between two straight parallel current carrying conductors of infinite length. Hence define SI unit of current ‘ampere’.
21. Distinguish between “dia? and “ferro? magnetic materials.
22. Mention the three type’s energy loss in a transformer.
23. Write three experimental observations of photoelectric effect.
24. Write the three postulates of Bohr’s atomic model.
25. Explain ‘Conduction band’ ‘Valance band’ and ‘Energy gap’, in semi -conductors.
26. What is modulation? Write the block diagram of the receiver. Production of amplitude modulated wave.
19. Derive an expression for potential energy of electric – dipole placed in a uniform electric field.
20. Write the expression for force per unit length between two straight parallel current carrying conductors of infinite length. Hence define SI unit of current ‘ampere’.
21. Distinguish between “dia? and “ferro? magnetic materials.
22. Mention the three type’s energy loss in a transformer.
23. Write three experimental observations of photoelectric effect.
24. Write the three postulates of Bohr’s atomic model.
25. Explain ‘Conduction band’ ‘Valance band’ and ‘Energy gap’, in semi -conductors.
26. What is modulation? Write the block diagram of the receiver. Production of amplitude modulated wave.
PART – D
IV. Answer any two of the following questions. 2×5=10
27. State Gauss’s law. Derive an expression for electric intensity at a point outside the uniformly charged shell.
28. Two cells of emf $\displaystyle E_{1}$ and $\displaystyle E_{2}$ internal resistance $\displaystyle r_{1}$ and $\displaystyle r_{2}$ are connected in parallel such that they send current in same direction. Derive an expression for equivalent resistance and equivalent emf of the combination.
29. Derive an expression for the intensity of magnetic field at any point on the axis of a circular current loop.
V. Answer any two of the following questions. 2×5=10
30. Derive an expression for the impedance of a series LCR circuit, when an AC voltage is applied to it.
31. Derive “Lensmaker’s” formula.
32. Explain the working of a n-p-n transistor in CE mode as an amplifier.
V. Answer any three of the following questions. 3×5=15
33. In a circular parallel plate capacitor radius of each plate is 5cm and they are separated by a distance of 2mm. Calculate the capacitance and the energy stored, when it is charged by connecting the battery of 200V (given $\displaystyle \epsilon _{0}=8.854 \times 10^{-12}Fm^{-1}$)
34. Two resistors are connected in series with 5V battery of negligible internal resistance. A current of 2A flows through each resistor. If they are connected in parallel with the same battery a current of $\displaystyle \frac{25}{3}A$ flows through combination. Calculate the value of each resistance.
35. A conductor of length 3m moving in a uniform magnetic field of strength 100 T. It covers a distance of 70 m in 5 sec. Its plane of motion makes an angle of $\displaystyle 30^{0}$ with direction of magnetic field. Calculate the emf induced in it.
36. In a Young’s double slit experiment wave length of light used is 5000 Å and distance between the slits is 2 mm, distance of screen from the slits is 1m. Find fringe width and also calculate the distance of 7th dark fringe from central bright fringe.
37. Half-life of U-238 undergoing a-decay is $\displaystyle 4.5 \times 10^{9}$ years. What is the activity of one gram of U-238 sample?
27. State Gauss’s law. Derive an expression for electric intensity at a point outside the uniformly charged shell.
28. Two cells of emf $\displaystyle E_{1}$ and $\displaystyle E_{2}$ internal resistance $\displaystyle r_{1}$ and $\displaystyle r_{2}$ are connected in parallel such that they send current in same direction. Derive an expression for equivalent resistance and equivalent emf of the combination.
29. Derive an expression for the intensity of magnetic field at any point on the axis of a circular current loop.
V. Answer any two of the following questions. 2×5=10
30. Derive an expression for the impedance of a series LCR circuit, when an AC voltage is applied to it.
31. Derive “Lensmaker’s” formula.
32. Explain the working of a n-p-n transistor in CE mode as an amplifier.
V. Answer any three of the following questions. 3×5=15
33. In a circular parallel plate capacitor radius of each plate is 5cm and they are separated by a distance of 2mm. Calculate the capacitance and the energy stored, when it is charged by connecting the battery of 200V (given $\displaystyle \epsilon _{0}=8.854 \times 10^{-12}Fm^{-1}$)
34. Two resistors are connected in series with 5V battery of negligible internal resistance. A current of 2A flows through each resistor. If they are connected in parallel with the same battery a current of $\displaystyle \frac{25}{3}A$ flows through combination. Calculate the value of each resistance.
36. In a Young’s double slit experiment wave length of light used is 5000 Å and distance between the slits is 2 mm, distance of screen from the slits is 1m. Find fringe width and also calculate the distance of 7th dark fringe from central bright fringe.
37. Half-life of U-238 undergoing a-decay is $\displaystyle 4.5 \times 10^{9}$ years. What is the activity of one gram of U-238 sample?
0 Comments