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on touch
on rubbing
From the distance
either by rubbing or touching
In many countries with cold climates, the municipalities often sprinkle salt on icy roads in winter. Which among the following is the correct reason for this?
In mirrors the back surface is coated with a thin layer of :
In nuclear reactor, heavy water is used as
In nuclear reactors, graphite is used as a/an
In order to make an electromagnet you need a
In our homes, electricity is supplied at 220 V AC. The value 220 represents
In parallel combination of resistances, the voltage is ?
In severe winter, in cold countries water pipes burst because
In Solar cooker _ is used.
In SONAR which kind of wave is used?