1. What is the fundamental particle present in P - rays?

2. A compound was found to contain nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is

(a) NO (b) N2O3 (c) N2O5 (d) N2O4

3. Give the name of the radioactive isotope of hydrogen:

4. Cement mixed with gravel, sand, and water is called what?

5. What are isotopes?

6. The largest number of molecules is in

(a) 36 g of water (b) 28 g of carbon monoxide (c) 46 g of ethyl alcohol (d) 54 g of nitrogen pentoxide

7. What are isobars?

8. What is the measure of performance of petrol in internal combustion engines?

9. What is Isotone?

10. The total number of electrons in one molecule of carbon dioxide is

(a) 22 (b) 44 (c) 66 (d) 88