Brass is made of
1). copper and tin
2). tin and lead
3). copper and zinc
4). copper tin and zinc
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1. Which of the following could be used as fuel in propellant or rockets ?
2. The major harmful gas emitted by automobile vehicle which causes air pollution is
4. The iron ore which contains 72% of iron is :
5. The metal compound commonly found in Sindhoor or Kumkum is based on
6. What is the maximum Water Vapour content in the atmosphere
7. The BOD values of water indicate the
8. A change in which no new substances are formed is called _____________.