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Q. A photostat machine works on
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Q. The mechanical power developed by the D.C motor is maximum when back e.m.f is equal to
Q. Which one of the following is a source of methane emission into the atmosphere?
Q. During summer, we feel comfortable under a fan because it
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Q. Law of Electrolysis was discovered by
Q. The splitting of different colours of light in a prism is :
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