Physics
Previous year question paper with solutions for Physics Mar-2018
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Question paper 1
1. For alloys the value of temperature coefficient of resistance is very high. (True / False)
Answer:
2. __________was the first scientist who produced electromagnetic'waves in a laboratory
Answer:
3. One atomic mass unit is equal to 1.67 x 10-27 g (Yes/No)
Answer:
4. Choose the correct option :
Electrical conductivity of a semi conductor-
(i) decreases with rise in its temperature.
(ii) increases with rise in its temperature.
(iii) does not changes with temperature.
(iv) first decreases and then increases with rise in temperature
Answer:
5 Define resonant frequency of LCR series circuit
Answer:
6. What is the de-Broglie wavelength of an electron beam accelerated through apotential difference of 25V ?
Answer:
7. Give the basic function of antenna.
Answer:
8. What are diamagnetic substances ?
Answer:
9. How the eye of a person suffering from myopia can be corrected ? Explain with the help of ray diagram?
Answer:
10. A wire with an area of cross-section as across its ends is 25V Calculate the drift velocity of electrons. Given the number density of electrons as 5 x 1020 electrons per cubic meter (e/m-3).
Answer:
11. Explain ground wave propagation
Answer:
12. Write two uses of infrared rays.
Answer:
13. A capacitor of unknown value and an inductor of 0.1H and a resistor of 10\(\Omega\) are connected in series to 220V 50Hz, ac source. It is found that the power factor of circuit is unity. Calculate the capacitance of capacitor and maximum amplitude of current
Answer:
14. Wny does the thickness of depletion layer of pn-junction increases in the circuit diagram of reverse biasing.
Answer:
15. A solenoid of length 50cm, having 100turns carries a current of 2.5A Find the magnatic field (B), (a) in the interior of the solenoid Given 4\(\pi\) x10-7 WbA-1 m-1
Answer:
16. What is total internal reflection of light ? What are the two essential conditions for total intemal reflection to take Place ?
Answer:
17. Derive an expression for the energy stored in a capacitor. In what form is the energy stored in a charged capacitor?
Answer:
18. Define e.m.f. of a cell. How can you compare the emf of two cells using potentiometer ?
Answer:
19. (a) Wnte the truth table of AND gate
(b) Wnat is rectifier ? Explain the working of p-n junction diodp as a full-wave rectifier with the help of suitable circuit diagram.
or
A common emitter (CE) transistor has a current gain of 100. If emitter current is 8.08 mA, find the base and collector current.
Answer:
20. With the help of labelled diagram, describe the principle, construction and working of a transformer.
Answer:
21. (a) State the laws of photo electric effect.
(b) Name a phenomenon which illustrates the particle nature of light
Answer:
22. What is radioactivity ? State radioactive decay law and show that itis exponential in nature.
Answer:
23. With the help of ray diagram, describe the construction, working of a compound microscope when the final image is formed at least distance of distinct vision (D = 25cm). Derive an expression for its magnifying power (m).
or
(a) Two lenses of powers +15D and -5D are in contact with each other. What is the focal length of combination ?
(b) In the Young's double slit experiment, two slits 0.l25mm apart are illuminated by light of wavelength 4500A'. The screen is 1m away from the plane of the slits. Find the separation between second bright fringes on both sides of central maxima.
Answer:
24. (a)Why two electric lines of force/field cannot intersect each other? '
(b) State Coulomb's law, explain its vector form and define S.I unit of electric charge. State two limitations of Coulomb's law.
or
(a) What is the shape of equipotential surface for a given point charge q.
(b) State Gauss's theorem. With the help of diagram, derive an .expression for the electric field intensity due to uniformly charged thin spherical shell at apoint (i) outside (ii) inside (iii) on the surface of the spherical shell.
Answer:
25. (a) How can a galvanometer be converted into an ammeter ?
(b) Derive an expression for the force acting on a current carrying straight conductor kept in a uniform magnetic fie1d. Name the rule used to determine the direction of this force. Underwhat condition this force is maximum and zero?
Answer:
26. (a) What is the essential condition for diffraction of light to occur ?
(b) What is polarisation of light ? Explain polarisation of light by reflection with the suitable diagram and hence derive Brewster's law.
or
(a) Why does the sky appear blue ?
(b) With the help of suitable diagram, sign conventions and assumptions, derive Lens Maker's formula for a convex lens.
Answer:
Question paper 2
Part-A
1. One atomic mass unit is equal to 1.67 x10-27 g. (Yes/No)
Answer:
2. Define resonant frequency of LCR series circuit.
Answer:
Read more3. What are diamagnetic substances ?
Answer:
Read more4. For alloys the value of temperature coefficient of resistance is very high. (True / False)
Answer:
Read more5. What is the de-Broglie wavelength of an electron beam accelerated through a potential difference of 25V
Answer:
Read more6. …………. was the first scientist who produced electromagnetic waves in a laboratory.
Answer:
Read more7. Choose the correct option:
Electrical conductivity of a semi conductor -
(i) decreases with rise in its temperature.
(ii) increases with rise in its temperature.
(iii) does not changes with temperature.
(iv) first decreases and then increases with rise in temperature
Answer:
8. Give the basic function of antenna
Answer:
Read more9. Write two uses of infrared rays.
Answer:
Read more10. Why does the thickness of depletion layer of pn-junction increases in reverse biasing ? Draw the circuit diagram of reverse biasing.
Answer:
Read more11. What is total internal reflection of light ? What are the two essential conditions for total internal reflection to take place?
Answer:
Read more13. Explain ground wave propagation
Answer:
Read more14. A capacitor of unknown value and an inductor of 0.1H and a resistor of 1022 are connected in series to a 220V, 50Hz ac source. It is found that the power factor of circuit is unity. Calculate the capacitance of capacitor and maximum amplitude of current.
Answer:
Read more15. A wire with an area of cross-section as 10mm2 has a resistance of 512, when a potential difference across its ends is 25V. Calculate the drift velocity of electrons. Given the number density of electrons as 5x1020 electrons per cubic meter (e/m?).
Answer:
Read more16. A solenoid of length 50cm, having 100 turns carries a current of 2.5A. Find the magnetic field (B) (a) in the interior of the solenoid, (b) at one end of the solenoid. Given 4 = 4 T x 10-7 WbA-'m-!
Answer:
17. (a) Write the truth table of AND gate.
(b) What is rectifier ? Explain the working of p-n junction diode as a full-wave rectifier with the help of suitable circuit diagram
Answer:
Read more(a) A common emitter (CE) transistor has a current gain of 100. If emitter current is 8.08 mA, find the base and collector current.
(b) In a sample of semi conductor mobilities of electrons and holes are 24x10 cm2 V-S and 0.2x103 cm2 V-1S-respectively. If the density of electrons is 0.8x1014 cm and that of holes is 0.4 x 104cm 3 . Find the nature of semi-conductor and its conductivity.
Answer:
Read more18. (a) State the laws of photo electric effect.
Answer:
Read more(b) Name a phenomenon which illustrates the particle nature of light
Answer:
19. With the help of ray diagram, describe the construction, working of a compound microscope when the final image is formed at least distance of distinct vision (D = 25cm). Derive an expression for its magnifying power (m).
Answer:
Read moreor
(a) Two lenses of powers +15D and -5D are in contact with each other. What is the focal length of combination ? (b) In the Young's double slit experiment, two slits 0.125mm apart are illuminated by light of wavelength 4500A°. The screen is 1m away from the plane of the slits. Find the separation between second bright fringes on both sides of central maxima.Answer:
20. Derive an expression for the energy stored in a capacitor. In what form is the energy stored in a charged capacitor
Answer:
Read more21. With the help of labelled diagram, describe the principle, construction and working of a transformer.
Answer:
Read more22. Define e.m.f. of a cell. How can you compare the emf of two cells using potentiometer ?
Answer:
Read more23. What is radioactivity ? State radioactive decay law and show that it is exponential in nature
Answer:
24. (a) Write SI unit of magnetic dipole moment.
(b) What is magnetic dipole ? Derive an expression for magnetic field intensity at a point on the equatorial line of a bar magnet.
OrAnswer:
Read more(a) How can a galvanometer be converted into an ammeter ?
Answer:
Read more(b) Derive an expression for the force acting on a current carrying straight conductor kept in a uniform magnetic field. Name the rule used to determine the direction of this force. Under what condition this force is maximum and zero?
Answer:
Read more25. (a) What is the essential condition for diffraction of light to occur ?
Answer:
(b) What is polarisation of light ? Explain polarisation of light by reflection with the suitable diagram and hence derive Brewster's law
Answer:
Read moreOr
(a) Why does the sky appear blue ?Answer:
Read more(b) With the help of suitable diagram, sign conventions and assumptions, derive Lens Maker's formula for a convex lens.
Answer:
Read more26. (a) Why two electric lines of force/field cannot intersect each other?
Answer:
Read more(b) State Coulomb's law, explain its vector form and define SI unit of electric charge. State two limitations of Coulomb's law.
OrAnswer:
Read more(a) What is the shape of equipotential surface for a given point charge
Answer:
Read more(b) State Gauss's theorem. With the help of diagram, derive an expression for the electric field intensity due to uniformly charged thin spherical shell at a point (i) outside (ii) inside (iii) on the surface of the spherical shell.
Answer:
Read more
Question paper 3
Part-A
1. What is the de-Broglie wavelength of an electron beam accelerated through a potential difference of 25V ?
Answer:
2. What are diamagnetic substances ?
Answer:
3. For alloys the value of temperature coefficient of resistance is very high. (True/False)
Answer:
4. One atomic mass unit is equal to 1.67 X10-27 g. (Yes/No)
Answer:
5. Give the basic function of antenna.
Answer:
6. Choose the correct option:
Electrical conductivity of a semi conductor -
(i) decreases with rise in its temperature.
(ii) increases with rise in its temperature.
(iii) does not changes with temperature.
(iv) first decreases and then increases with rise in temperature.
Answer:
7. ………… was the first scientist who produced electromagnetic waves in a laboratory.
Answer:
8. Define resonant frequency of LCR series circuit.
Answer:
9. Why does the thickness of depletion layer of pn-junction increases in reverse biasing ? Draw the circuit diagram of reverse biasing.
Answer:
10. What is total internal reflection of light ? What are the two essential conditions for total internal reflection to take place ?
Answer:
11. How the eye of a person suffering from myopia can be corrected ? Explain with the help of ray diagram.
Answer:
12. Explain ground wave propagation.
Answer:
13. A solenoid of length 50cm, having 100 turns carries a current of 2.5A. Find the magnetic field (B) (a) in the interior of the solenoid, (b) at one end of the solenoid. Given 4 = 4 T x 10-7 WbA-'m-!
Answer:
14. Write two uses of infrared rays. 15. A capacitor of unknown value and an inductor of 0.1H and a resistor of 1082 are connected in series to a 220V, 50Hz ac source. It is found that the power factor of circuit is unity.
Answer:
16. A wire with an area of cross-section as 10mm? has a resistance of 512, when a potential difference across its ends is 25V. Calculate the drift velocity of electrons. Given the number density of electrons as 5x1020 electrons per cubic meter (e/m-').
Answer:
17. (a) State the laws of photo electric effect.
(b) Name a phenomenon which illustrates the particle nature of light.
Answer:
18. With the help of ray diagram, describe the construction, working of a compound microscope when the final image is formed at least distance of distinct vision (D = 25cm). Derive an expression for its magnifying power (m).
orAnswer:
(a) Two lenses of powers +15D and -5D are in contact with each other. What is the focal length of combination ? (b) In the Young's double slit experiment, two slits 0.125mm apart are illuminated by light of wavelength 4500A°. The screen is 1m away from the plane of the slits. Find the separation between second bright fringes on both sides of central maxima.
Answer:
19. Derive an expression for the energy stored in a capacitor. In what form is the energy stored in a charged capacitor ?
Answer:
20. (a) Write the truth table of AND gate. (b) What is rectifier ? Explain the working of p-n junction diode as a full-wave rectifier with the help of suitable circuit diagram.
OrAnswer:
(a) A common emitter (CE) transistor has a current gain of 100. If emitter current is 8.08 mA, find the base and collector current. (b) In a sample of semi conductor mobilities of electrons and holes are 24x10 cm2 V-1 S and 0.2x10 cm2 V-1 S-respectively. If the density of electrons is 0.8x1024 cm and that of holes is 0.4 x 104cm-3. Find the nature of semi-conductor and its conductivity.
Answer:
21. What is radioactivity ? State radioactive decay law and show that it is exponential in nature.
Answer:
22. With the help of labelled diagram, describe the principle, construction and working of a transformer.
Answer:
23. Define e.m.f. of a cell. How can you compare the emf of two cells using potentiometer ? (a) What is the essential condition for diffraction of light to occur ? (b) What is polarisation of light ? Explain polarisation of light by reflection with the suitable diagram and hence derive Brewster's law.
Answer:
24. (a) Why does the sky appear blue ?
(b) With the help of suitable diagram, sign conventions and assumptions, derive Lens Maker's formula for a convex lens
Answer:
25. (a) Why two electric lines of force/field cannot intersect each other? (b) State Coulomb's law, explain its vector form and define SI unit of electric charge. State two limitations of Coulomb's law.
Or
Answer:
(a) What is the shape of equipotential surface for a given point charge q. (b) State Gauss's theorem. With the help of diagram, derive an expression for the electric field intensity due to uniformly charged thin spherical shell at a point (i) outside (ii) inside (iii) on the surface of the spherical shell.
Answer:
26. (a) Write SI unit of magnetic dipole moment. (b) What is magnetic dipole ? Derive an expression for magnetic field intensity at a point on the equatorial line of a bar magnet.
OrAnswer:
(a) How can a galvanometer be converted into an ammeter ? (b) Derive an expression for the force acting on a current carrying straight conductor kept in a uniform magnetic field. Name the rule used to determine the direction of this force. Under what condition this force is maximum and zero ?
Answer: