Pumpa Practice Questions. Science CBSE, Class 9 New: lessons, tests, tasks.

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1.	Early atomic theories Difficulty: easy	2
2.	Discovery of electron Difficulty: medium	2
3.	Cathode and canal rays Difficulty: easy	1
4.	Thomson's model of atom Difficulty: medium	2
5.	Rutherford's experiment Difficulty: easy	2
6.	Rutherford’s Gold Foil Experiment and Failure of Thomson’s Model Difficulty: hard	3
7.	Atomic Structure and Discoveries Difficulty: easy	3
8.	Observation of Rutherford's experiment Difficulty: medium	2
9.	Drawbacks of Rutherford Difficulty: easy	2
10.	Bohr's atomic model Difficulty: easy	2
11.	Energy shells and atomic models Difficulty: easy	1
12.	Comparison of subatomic particles Difficulty: hard	3
13.	Subatomic particles and atomic mass Difficulty: medium	2
14.	Symbols of elements Difficulty: easy	2
15.	Mass and atomic number Difficulty: easy	1
16.	Bohr's atomic model Difficulty: easy	2
17.	Atomic number and mass number Difficulty: medium	3
18.	Calculate the mass number Difficulty: hard	3
19.	Electronic configuration of elements Difficulty: medium	2
20.	Valency Difficulty: easy	2
21.	Valence electrons Difficulty: easy	1
22.	Formation of ions and valency Difficulty: medium	3
23.	Isotopes and isobars Difficulty: easy	2
24.	Properties of isotopes, isobars and isotones Difficulty: medium	2
25.	Isotope and isobar Difficulty: hard	4

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