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Model Paper Physics Subjective
Intermediate Part – II (12th Class) Examination Session 2012-2014 and onward
Total marks: 83 Time: 3:10 hours
SECTION --- I
2. Write answers of any EIGHT questions. (8 x 2 = 16)
(i) Electric lines of force never cross each other. Why?
(ii) What is Coulomb’s force between two point charges if the distance between them is doubled?
What happens when mass of charges is made 4 times?
(iii) Differentiate between electric potential and electrical potential difference.
(iv) What is polarization and how dipoles are formed in dielecric?
(v) What is function of a grid in CRO?
(vi) What is a stable or dead beat galvanometer?
(vii) What is back emf effect in D.C. motors?
(viii) Describe the change in the magnetic field inside a solenoid carrying a steady current I if
(a) Length of solenoid is doubled but the number of turns remains the same.
(b) The number of turns is doubled but the length remains same.
(ix) How can you use a magnetic field to separate isotopes of a chemical element?
(x) How would you position a flat loop of wire in a changing magnetic field so that there is no emf
induced in the loop?
(xi) Describe working principle of an A.C. generator.
(xii) How the power losses can be minimized in a transformer?
3. Write answers of any EIGHT questions. (8 x 2 = 16)
(i) A potential difference is applied across the ends of a copper wire. What is the effect on drift
velocity of free electrons by
(i) Increasing the potential difference.
(ii) Decreasing the length and temperature of the wire.
(ii) Why terminal potential difference of a battery decreases when the current drawn from it
increases.
(iii) Why we prefer Potentiometer in place of Voltmeter for measuring potential difference?
(iv) How does doubling the frequency affect the reactance of
(a) An inductor.
(b) A capacitor.
(v) How the radio waves are received?
(vi) Write four important properties of series resonance circuit.
(vii) What are the responsible factors for production of magnetic field in an atom?
(viii) Why the charge carriers are not present in depletion region?
(ix) Distinguish between intrinsic and extrinsic semiconductors. How would you obtain N type and
P type material from pure Silicon?
(x) What are hard and soft magnetic materials? Explain.
(xi) What is difference between inverting and non inverting amplifier?
(xii) Why resistance of semiconductor decreases with rise in temperature?
4. Write answers of any SIX questions. (6 x 2 = 12)

(i) What advantages an electron microscope has over on optical microscope?
(ii) For what angle Compton shift is minimum?
(iii) Why we do not notice the de Broglie wavelength for a pitched cricket ball? Explain.
(iv) What are advantages of lasers over ordinary light?
(v) Why the X rays can not be produced from lighter atoms?
(vi) A particle which produces more ionization is less penetrating. Why?
(vii) What is the difference between an electron and a β particle?
(viii) What is difference between radiation counter and detector?
(ix) What are the main uses of nuclear reactors?
Model Paper Physics Subjective
Intermediate Part – II (12th Class) Examination Session 2012-2014 and onward
Total marks: 83 Time: 3:10 hours
SECTION --- I
2. Write answers of any EIGHT questions. (8 x 2 = 16)
(i) Electric lines of force never cross each other. Why?
(ii) What is Coulomb’s force between two point charges if the distance between them is doubled?
What happens when mass of charges is made 4 times?
(iii) Differentiate between electric potential and electrical potential difference.
(iv) What is polarization and how dipoles are formed in dielecric?
(v) What is function of a grid in CRO?
(vi) What is a stable or dead beat galvanometer?
(vii) What is back emf effect in D.C. motors?
(viii) Describe the change in the magnetic field inside a solenoid carrying a steady current I if
(a) Length of solenoid is doubled but the number of turns remains the same.
(b) The number of turns is doubled but the length remains same.
(ix) How can you use a magnetic field to separate isotopes of a chemical element?
(x) How would you position a flat loop of wire in a changing magnetic field so that there is no emf
induced in the loop?
(xi) Describe working principle of an A.C. generator.
(xii) How the power losses can be minimized in a transformer?
3. Write answers of any EIGHT questions. (8 x 2 = 16)
(i) A potential difference is applied across the ends of a copper wire. What is the effect on drift
velocity of free electrons by
(i) Increasing the potential difference.
(ii) Decreasing the length and temperature of the wire.
(ii) Why terminal potential difference of a battery decreases when the current drawn from it
increases.
(iii) Why we prefer Potentiometer in place of Voltmeter for measuring potential difference?
(iv) How does doubling the frequency affect the reactance of
(a) An inductor.
(b) A capacitor.
(v) How the radio waves are received?
(vi) Write four important properties of series resonance circuit.
(vii) What are the responsible factors for production of magnetic field in an atom?
(viii) Why the charge carriers are not present in depletion region?
(ix) Distinguish between intrinsic and extrinsic semiconductors. How would you obtain N type and
P type material from pure Silicon?
(x) What are hard and soft magnetic materials? Explain.
(xi) What is difference between inverting and non inverting amplifier?
(xii) Why resistance of semiconductor decreases with rise in temperature?
4. Write answers of any SIX questions. (6 x 2 = 12)

(i) What advantages an electron microscope has over on optical microscope?
(ii) For what angle Compton shift is minimum?
(iii) Why we do not notice the de Broglie wavelength for a pitched cricket ball? Explain.
(iv) What are advantages of lasers over ordinary light?
(v) Why the X rays can not be produced from lighter atoms?
(vi) A particle which produces more ionization is less penetrating. Why?
(vii) What is the difference between an electron and a β particle?
(viii) What is difference between radiation counter and detector?
(ix) What are the main uses of nuclear reactors?