Physics homework XII-11th February Sunday

1. What are beats? Derive an expression for beat frequency.
2. How is it that one can recognize a friend from his voice without seeing him?
3. What is polarization of light? State and prove Brewster's law.
4. Is polarization possible for longitudinal wave?
5. What is meant by wattless current?
6. What are advantages of a.c over d.c.?
7. Derive the condition for resonant frequency of LCR alternating current circuit.
8. What is noise pollution? Mention its sources and preventions.

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Physics homework XI-9th February Friday

1. Define capacitance. Derive the capacitance of a parallel plate capacitor.
2. Explain how the capacitance of a parallel plate capacitor can be increased.
3. What are the uses of dielectric in a capacitor?
4. What is angular magnification? Derive an expression for it for astronomical telescope in normal adjustment and when final image is formed at near point.
5. Why mercury does not wet the glass tube?
6. The tip of the nib of a pen is split. Why?
7. Define surface tension and surface energy of a liquid and derive a relation between them.

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Physics homework grade XII-for 4th Feb Sunday

1. What is pressure amplitude? Obtain an expression for it.
2. Define Intensity of sound. Obtain an expression for it.
3. If the pressure amplitude of a sound wave is halved, by what factor does the intensity of the wave change?
4. What is meant by threshold of hearing?
5. Why is the roaring of lion different than the sound of a mosquito?
6. How is it that one can recognize a friend from his voice without seeing him?
7. A nucleus contains no electrons, yet it ejects them. Explain.
8. How do the mass number and atomic number of a radioactive element change in an alpha, beta and gamma decay?
9. How do beta particles differ from electrons?
10. Discuss the importance of physics for the development of nation.
11. A transformer gets heated up while in use. Why?
12. Find the impedance of LCR circuit in series.

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Physics homework grade XI-2nd Feb Friday

1. What is capacitance? Derive an expression for the capacitance of a parallel plate capacitor?
2. Why are bridges declared unsafe after a long use?
3. Explain which one is more elastic, rubber or steel?
4. Define different types of stress and strain.
5. What is surface tension? Establish a relationship between surface tension and surface energy.
6. State first law of thermodynamics.
7. Prove that Cp -Cv =R
8. What are Myopia and Hypermetropia? How are they corrected?

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