2. Mention any two uses of Optical Fibres?
3. On what factors does the period of oscillation of a bar magnet in a uniform magnetic field depend?
4. Can there be electric potential at a point with zero electric intensity? Give an example?
5. Explain Ohm's Law.
6. How many electrons flow through a wire when 1A current passes for 1 milli second?
7. State Moseley's Law? What is its importance?
8. Write the truth table of NAND gate. How does it differ from AND gate?
9. In a transistor circuit the base current changes from 50 μA to 150 μA. The corresponding change in the collector current is from 0.2 mA to 4.2 mA. Find the current gain.
10. Mention the basic methods of modulation.
11. Explain double refraction (birefringence) of light.
12. Derive an expression for the magnetic induction at a point on the axial line of a bar magnet.
13. Derive an equation for the energy stored in a capacitor. If a dielectric is introduced between the plates how will energy change?
14. State and explain Kirchhoff's Laws.
15. What are Peltier and Thomson effects? Define their coefficients.
16. A galvanometer has a resistance of 100 Ω. A current of 10-3 A pass through the galvanometer. How can it be converted into a) Ammeter of range 10 A and b) Voltmeter of
range 10 V?
17. Describe the origin of X - ray spectra?
18. Distinguish between half wave and full wave rectifiers.
19. State Faraday's laws of electromagnetic induction. Lenz's law. Explain self and mutual induction. Derive the equation for the induced emf in self and mutual inductions.
20. Explain the source of Stellar energy. Explain the carbonnitrogen cycle and protan-protan cycle occurring in stars.
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