Short Answer TypeWhen a tuning fork, struck by a rubber pad, is held over a length of air column in a tube, it produces a loud sound for a fixed length of the air column.
i) Name the above phenomenon.
ii) How does the frequency of the loud sound compare with that of the tuning fork?
iii) State the unit for measuring loudness.An object is placed infront of a convex lens such that the image formed has the same size as that of the object. Draw a ray diagram to illustrate this.
Give two reasons as to why copper is preferred over other metals for making calorimeters.
Calculate the amount of heat released when 5.0 g of water at 20o C is changed into ice at 0o C.
i) Define specific latent heat of vaporization of a substance.
ii) What is the principle of calorimetry?i) Specific latent heat of vaporization is the quantity of heat required to convert unit mass of a substance from liquid to vapor state without change of temperature.
ii) Principle of calorimetry states that when a hot body is mixed with a cold body, then heat passes from hot body to cold body till both attain same temperature .
i.e., Heat lost by hot body = Heat gained by cold body (if system is fully insulated)
Explain why water is used in hot water bottles for fermentation and also as a universal coolant.
A wire of uniform thickness with a resistance of 27 ohm is cut into three equal pieces and they are joined in parallel. Find the resistance of the parallel combination.
Find the cost of operating an electric toaster for two hours if it draws 8 A current on a 110 Volt circuit. The cost of electrical energy is Rs. 2.50 per kWh.
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