Welcome to your IAS Quiz 1A

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1. 
Brass gets discoloured in air because of the presence of which of the following gases in air?

2. 
Which of the following is a non metal that remains liquid at room temperature?

3. 
What is the unit for measuring the amplitude of a sound?

4. 
Reading of a barometer going down is an indication of

5. 
Which among the following is a positively charged particle emitted by a radioactive element?

6. 
In an atomic nucleus, neutrons and protons are held together by

7. 
Which type of fire extinguisher is used for petroleum fire?

8. 
Glass is made of the mixture of

9. 
Very small time intervals are accurately measure by

10. 
Nuclear fission is caused by the impact of

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