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Give scientific reason:
Not attraction but repulsion is a sure test of magnetism.
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Write a short note on lighting conductors.
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Explain the following:
Resistance of a conductor
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Draw the magnetic field lines around a bar magnet when a bar magnet is placed such that the N pole points North.
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What is meant by electrostatic induction? You have been given two metal containers A and Band a positively charged body X. With the help of a diagram, explain the different stages of charging - A positively, and B negatively.
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With the help of a diagram explain the following:
Magnetisation of an iron bar by a single touch method.
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Differentiate between:
Primary and secondary cell.
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With the help of a diagram explain the following:
Magnetisation of steel needle using electric current such that the pointed end should have north polarity.
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Distinguish between
Natural and artificial magnets.
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How does the speed of sound depend on (i) Amplitude, and (ii) Wavelength?
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On placing your ear close to an iron railing which is tapped some distance away, sound is heard twice. Explain, why?
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What is the ratio of speed of light to speed of sound?
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State the effect of pressure on the speed of sound in air.
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he sound of an explosion on the surface of a lake is heard by a boatman 120 m away and by a diver 120 m below the point of explosion. Out of the two persons, who would hear the sound first? Why?
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