CBSE Guess > Papers > Important Questions > Class IX > 2009 > Science > Science By : Mr Nitin Raj Oraon
CBSE CLASS I X
Q. 1. What is nitrogen fixation? Mention 3 ways of nitrogen fixation & chemical reactions related to this process.
Q. 2. What are the limitations of Rutherford’s model of the atom?
Q. 3. Write a short note on ‘OZONE DEPLETION’.
Q. 4. What is nucleon? An element has 4 electrons in the M shell of it atom. What is the atomic no. of the element?
Q. 5. What is biogeochemical cycle? Draw a neat diagram of carbon & nitrogen cycle in nature.
Q. 6. What are the differences between atom & ion? Give examples.
Q. 7. Describe Bohr’s model of the atom.
Q. 8. Give any 3 properties of Canal rays.
Q. 9. Define Isotopes. What are the characteristics of isotopes? Write any 4 uses of Isotope .
Q. 10. What are the fundamental particles of atom? Write their Absolute charge & Mass.
Q. 11. Which of the 2 elements would be more reactive & why, element X of atom no. 36 or element Y of atomic no. 20.
Q. 12. Write any 4 importance of water in plant life.
Q. 13. What is denitrification?
Q. 14. Relative atomic mass of an element A is 16.2.There are 2 isotopes with mass no.16 and 18 respectively of the element. Calculate the percentage of these 2 isotopes present in the element.
Q. 15. Write any 4 properties of cathode rays.
Paper By : - Mr. Nitin Raj Oraon
Email Id : - [email protected]
Telephone No. - 06512550506
