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State the principle on which SONAR is based.
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Two blocks P and Q of different metals having their mass in the ratio 2 : 1 are given same amount of heat. Their temperature rises by same amount. Compare their specific heat capacities.
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Give one example where high specific heat capacity of water is used as heat reservoir.
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Calculate the amount of heat energy required to raise the temperature of 200 g of copper from 20°C to 70°C. Specific heat capacity of copper = 390 J kg-1 K-1.
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State the couple's effect on a body.
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Define kilowatt hour.
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Draw a ray diagram to show the refraction of a monochromatic ray through a prism when it suffers minimum deviation.
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When does the nucleus of an atom tend to become radioactive?
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A boy uses a single fixed pulley to lift a load of 50 kgf to some height. Another boy uses a single movable pulley to lift the same load to the same height. Compare the effort applied by them. Give a reason to support your answer.
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A pulley system with VR = 4 is used to lift a load of 175 kgf through a vertical height of 15 m. The effort required is 50 kgf in the downward direction. (g = 10 N kg-1)
Calculate:
- Distance moved by the effort
- Work done by the effort
- M.A. of the pulley system
- Efficiency of the pulley system
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Name the radiations which are absorbed by greenhouse gases in the earth’s atmosphere.
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A radiation X is focused by a particular device on the bulb of a thermometer and mercury in the thermometer shows a rapid increase. Name the radiation X
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Answer the following questions based on a hot cathode ray tube
Name the charged particles
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Answer the following questions based on a hot cathode ray tube.
State the approximate voltage used to heat the filament
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Answer the following questions based on a hot cathode ray tube.
What will happen to the beam when it passes through the electric field?
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State three factors on which the rate of emission of electrons from a metal surface depends
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Why do Free electrons not leave the metal surface on their own
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How can they be made to leave the metal surface? (State any two ways)
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State the dependence of angle of deviation on the refractive index of the material of the prism.
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