What material is used to make electric heater coil ?
1). Copper
2). Iron
3). Silver
4). Nichrome
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1. Which one among the following is used in making gunpowder?
2. Most commonly used bleaching agent is
4. Which of the following could be used as fuel in propellant or rockets
5. Supersonic Jet causes pollution by thinning of
6. Fuse wire is made of an alloy of
7. The BOD values of water indicate the
9. Which of the following gases emitted from automobile exhaust is poisonous?
10. One of the following is used to dissolve noble metals. That is