www.dhsekerala.gov.in Higher Secondary Education Kerala : HSE Physics Model Question Paper

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MODEL QUESTION PAPER FEB – 2011
Part III PHYSICS
HSE II HSE

1. Match the following.
Coulomb’s law Conservation of charge
Electric Intensity onservation of Energy
Kirchhoff’s first law N/C
Super conductor N/m
F=q1q2/4p?0r2
Zero Resistance
sE (2)

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2. EMF of a dry cell is 1.5v.
a. What do you mean by EMF ? (1)
b. What is internal resistance of a cell? (1)
c. With a neat diagram,explain how potentiometer is used to find the internal resistance of a cell? (3)
d. Potentiometer is a better instrument than voltmeter to measure emf. Why? (1)
3. a. Derive the expression for the effective focal length of two convex lenses kept in contact? (2)
b. Can a diverging lens act as a converging lens? (1)
c. A convex lens is combined with a concave lens of same focal length.What is the nature of the combination? (1)
OR
Microscopes are optical instruments used to get enlarged images of near objects.
p.Describe with the help of ray diagram, the working of compound microscope. (3)
q. Find the expression for magnification. (1)
4. a. Name the defect of the eye if the eye lens focuses the incoming light at a point behind the retina. (1)
b. How will you correct it ? (1)
5. a. 1 u = ----- MeV (½)
b. Obtain the binding energy in MeV of a nitrogen neucleus (7N14). mp= 1.007825u mn = 1.008665 u mN = 14.00307 u. (1½)
6. a. What should be the nature of the two slits used in the Young’s double slit experiment ? (1)
b. Obtain an expression for the fringe width obtained in the experiment. (3)
c. What changes in the interference pattern will be observed if the sources are far apart from each other ? (1)
7. a. State Gauss’s Law in electrostatics. (1)
b. Derive an expression for the field due to a uniformly charged infinite plane sheet.(2)
c. What is the magnitude of electric field between two parallel plates having equal and opposite charges ? (1)
8. A current carrying loop is placed in a uniform magnetic field B. a is the angle made by the plane of the coil with the field.
a. Why will this loop rotate ? (1)
b. Derive an expression for torque acting on the coil. (2)
c. Why do we suspend this loop in a radial magnetic field in a moving coil
galvanometer ? (1)
9. a.What is the importance of Davisson and Germer experiment? (1)
b. Prove that the de Broglie wavelength associated with electron is (1.22/v2) nm
when it is accelerated by a potential difference of V volts. (2)
c. An alpha particle, a proton and an electron have the same kinetic energy. Which of them has minimum de Broglie wavelength. Why? (2)
10.a. Name the three independent quantities used to specify earth’s magnetism. (1½)
b.Why do magnetic field lines prefer to pass through ferromagnetic material than through air? (½)
11. In a chamber a uniform magnetic field is maintained. An electron is shot into the field with a speed v normal to the field.
a. Explain why path of the electron is a circle. (1)
b. Obtain an expression for frequency of revolution of electron. (2)
12.a. What is modulation? (1)
b. A transmitting antenna at the top of a tower has a height 32m and the height of receiver antenna is 50m . What is the maximum distance between them for communication in LOS mode? R=6400km (2)
13. An inductor, capacitor and a resistor are connected in series to ac source v = Vm sin wt
a. Draw a circuit diagram of LCR series circuit. (1)
b. Find the expression for impedance (2)
c. Obtain the condition for resonance of LCR circuit. (1)
14. The truth table of a logic gate is shown. Identify the gate ? (1)
A B Y
0 0 1
0 1 1
1 0 1
1 1 0
15. The current through a conductor is directly proportional to the potential difference
a. Name this law ? (1)
b. How will you represent graphically the variation of current and voltage for diode ? (2)
c. You are given a silicon and germanium diode.How will you experimentally find Which is germanium? (1)
16.A lamp is connected in series with a capacitor .
a. Predict your observations for ac and dc connections (1)
b. What happens in each case if the capacitance of the capacitor is reduced? (1)
c. what are the advantages of ac over dc? (1)
17. The diagram shows the main region of the electromagnetic spectrum.
Gamma X-ray ---- Visible ---- Microwave Radiowave
ray
a. Write the names of the two blank regions. (1)
b. Which radiation shown in the table has the shortest wavelength ? (1)
18. a. In scattering experiment, the value of impact parameter b = 0, the value of scattering angle = ---- (½)
b. Which are the emission line spectrum of hydrogen atom ? (1½)
19. A capacitor is used to store electric charge.
a. In a parallel plate capacitor, the capacitance increases from 4µF to 80 µF on introducing a dielectric medium between the plates. What is the dielectric constant of the medium ? (1)
b. Arrive at an expression for capacity of a parallel plate capacitor. (2)
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