Short Answer Type200 g of hot water at 80o C is added to 300 g of cold water at 10o C. Calculate the final temperature of the mixture of water. Consider the heat taken by the container to be negligible.
What happens to the heat supplied to a substance when the heat supplied causes no change in the temperature of the substance?
i) When 1 g of ice at 0o C melts to form 1 g of water at 0o C then, is the latent heat absorbed by the ice or given out by it.
ii) Give one example where high specific heat capacity of water is used as a heat reservoir.
iii) Give one example where high specific heat capacity of water is used for cooling purposes.
250 g of water at 30o C is present in a copper vessel of mass 50 g. Calculate the mass of ice required to bring down the temperature of the vessel and its contents to 5 degree C.
A mixture of radioactive substance gives off three types of radiations.
i) Name the radiation which travels with the speed of light.
ii) Name the radiation which has the highest ionizing power.i) State two properties which a substance should possess when used as a thermionic emitter.
ii) When an alpha particle gains two electrons it becomes neutral and becomes an atom of an element, which is a rare gas. What is the name of the rare gas?i) Define radioactivity.
ii) What happens inside the nucleus that causes the emission of beta particle?
iii) Express the above change in the form of an equation.
Long Answer TypeAn object is placed in front a lens between its optical centre and the focus and forms a virtual, erect and diminished image?
i) Name the lens which formed this image.
ii) Draw a ray diagram to show the formation of the image with the above stated characteristics.i) Concave lens
ii) The formation of image by the concave lens is as illustrated below:
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