(i) (a) Refer to the diagram given below. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen? (b) A glass lens always forms a virtual, erect and diminished image of an object kept in front of it. Identify the lens.
(ii) If live wire makes an accidental contact with the metal case, which circuit (A or B) in the diagram, illustrating an electric iron, is considered safe for the user (Assuming the fuse is present in the live wire in both circuits)? Justify your answer.
(iii) A transformer is used to change a high alternating e.m.f. to a low alternating e.m.f. of the same frequency. 2] (a) Identify the type of transformer used for the above purpose. (b) State whether the turns ratio of the above transformer is =1 or >1 or< l.
(iv) A solid of mass 60 g at 100°C is placed in 150 g of water at 20°C. The final steady temperature is 25°C. Calculate the heat capacity of solid. [sp. heat capacity of water=4.2Jg-1K-1 ]
(v) (a) Name the principle of AC generator. (b) State its one use.
(vi) (a) Name the radiations that are emitted during the decay of a nucleus, which has highest penetrating power? (b) Does the emission of the above-mentioned radiation result in a change in the mass number?
(vii) The graph (fig A) illustrates the correlation between the number of protons (x-axis) and the number of neutrons (y-axis) for elements A, B, C, D, and E in the periodic table. These elements are denoted by the letters rather than their conventional symbols. When the element C, depicted in the graph, undergoes radioactive decay, it releases radioactive rays. When these rays are directed into the plane of the paper in the presence of a magnetic field, as indicated in the fig B, they experience deflection, causing them to move upwards. (a) Name the radioactive radiations emitted by the element C. (b) Identify the daughter element from the graph. (c) Name the law used to identify the radioactive radiations emitted by the element.
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