Short Answer TypeDifferentiate between heat capacity and specific heat capacity.Â
i) Specific heat capacity is defined on unit mass but heat capacity is defined on entire mass.
ii) Specific heat capacity depends on the mass of the body but heat capacity does not depend on the mass of the body.Â
A hot solid of mass 60 g at 100o C is placed in 150 g of water at 200o C. The final steady temperature recorded is 25o C. Calculate the specific heat capacity of the solid.
i) Write an expression for the heat energy liberated by a hot body.
ii) Some heat is provided to a body to raise the temperature by 25o C. What will be the corresponding rise in temperature of the body as shown on the Kelvin scale?
iii) What happens to the average kinetic energy of the molecules as ice melts at 0 degree C?A piece of ice at 0o C is heated at a constant rate and its temperature recorded at regular intervals till steam is formed at 100o C. Draw a temperature-time graph to represent the change in phase? Label the different parts of your graph.Â
40 g of ice at 0o C is used to bring down the temperature of a certain mass of water at 60o C to 10oC. Find the mass of water used.Â
i) What is the value of the speed of gamma radiations in air or vacuum?
ii) Name a material exhibits fluorescence when cathode rays fall on it.Âi) Draw a simplified labelled diagram of a hot cathode ray tube.
ii) Name a common device where a hot cathode ray tube is used.Â
Long Answer Typei) What is meant by the term critical angle?
ii) How is it related to the refractive index of the medium?
iii) Does the depth of a tank of water appear to change or remain the same when viewed normally from above?A ray of light PQ is incident normally on the hypotenuse of a right-angled prism ABC as shown in the diagram alongside:
                      Â
i) Copy the diagram and complete the path of the ray PQ till it emerges from the prism?
ii) What is the value of the angle of deviation of the ray?
iii) Name an instrument where this action of the prism is used?Â
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