MODEL PAPER
JUNIOR INTERMEDIATE - PHYSICS
Time 3 hrs. Max. Marks : 60
I. Answer all the following questions. 10 x 2 = 20
1. Write the formulae for the speed of sound in solids and gases?
2. The electric lines of force do not intersect. Why?
3. How do you convert moving coil galvanometer into ammeter?
4. A coil of 20 turns has an area of 800mm2
0.3T with its plane parallel to the field, what is the torque that it experiences?
5. Why are household appliances connected in parallel?
6. State Faraday's law of electromagnetic induction?
7. Bombardment of lithium with protons gives rise to following reaction.
Find the a value of the reaction. The atomic masses of lithium, proton and helium are 7.016 u, 1.008 u and 4.008u
8. Draw the circuit symbols for p-n-p and n-p-n transistor?
9. Define modulation. Why is it necessary?
10. What is the phase difference between AC emf and current in the following: pure resistor, pure inductor and pure
and carries a current of 0.5A. If it is placed in a magnetic field of intensity
3 1 2 Li + H 2 He +Q
7 1 4
II. Answer any Six of the following questions. 6 x 4 = 24.
11. Define critical angle. Explain total internal reflection using a neat diagram?
12. Discuss the intensity of transmitted light when a polaroid sheet is rotated between two crossed polaroids?
13. Derive an expression for magnetic field inductionon the equitorial line of a bar magnet?
14. Derive an expression for the equivalent capacity when capacitors are connected inseries?
15. State kirchoffs law for an electrical net work. Using these conditions deduce the condition for balance in a
16. Write a short note on Debroglie's explanation of Bohr's second postulate of quantization?
17. Write a short note on Discovery of neutron?
18. Describe how a semiconductor diode is used as a half wave rectifier?
III. Answer any Two of the following questions. 2 x 8 = 16
19. (a) Explain the formation of stationary waves in stretched string and hence deduce the laws of transverse waves in
(b) A steel wire 0.6m long has a mass of 6 x 10–3kg. If the wire under a tension of 100N. What is the speed of
transverse waves on the wire?
20. (a) Describe the construction and working of moving coil galvanometer. Obtain the relation between current and
(b) The resistance of M.C.G is 5. The maximum current it measure is 0.015A. How would you convert it into
voltmeter to measure 1.5volt?
21. (a) Explain the principle and working of a nuclear reactor with help of labelled diagram?
(b) How much U235 is consumed in a day in an atomic power house operating at 200 MW, provided the whole of
mass U235 is converted into energy?
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