The major harmful gas emitted by automobile vehicles which causes air pollution is
1). Carbon Monoxide
2). Methane
3). Carbon dioxide
4). Ozone gas
2. Vulcanization of rubber is carried out by adding
3. A pungent smell often present near the urinals is due to
4. What was the fissionable material used in the bombs dropped at Nagasaki (Japan) in the years 1945?
5. Which one of the following is a microelement
6. Which is the purest form of iron ?
7. In arc welding, Argon is used because of its
8. Milk tastes sour when it is left in open for some time. This happens due to the formation of
9. Question 6.15:How is ‘cast iron’ different from ‘pig iron”?
10. The substance which does not expand on going from liquid state to solid state is