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Infrared radiations are used in warfare
(a) Infrared radiations are used in warfare. Explain with reason, why. (b) A ray of light is incident at 45° on an…
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(a) Infrared radiations are used in warfare. Explain with reason, why. (b) A ray of light is incident at 45° on an…
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(a) A coin kept inside water [μ = 4/3] when viewed from air in a vertical direction appears to be raised by…
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A convex lens of focal length 10 cm is placed at a distance of 60 cm from a screen. How far from…
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The diagram below shows two parallel rays A (Orange) & B (Blue) incident from air, on air-glass boundary. (a) Copy and complete…
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Copy the diagram given below and complete the path of the light ray PQ, as it emerges out of the prism by…
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The diagram below shows the ray OP travelling through an equilateral prism of a certain material. (a) Calculate the value of i2,…
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How is the radioactivity of a radio isotope affected if it undergoes a chemical change? Give a reason for your answer.
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Thermal capacities of substances A and B are same. If mass of A is more than mass of B then: (a) Which…
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A copper conductor is placed over two stretched copper wires whose ends are connected to a D.C. supply as shown in the…
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(a) Which electrical component protects the electric circuit in case of excess current and which can also be used as a switch?…