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CBSE Class 9 Science: Important Tips and Topics for SA2
Meritnation|Feb 2nd, 2016 05:28pm
The SA2 or the CBSE Summative Assessment II is just round the corner. Students are busy with their last minute revisions and trying to get the most out of their study hours these days.
Meritnation is here to give your exam preparation the final polish in Science. Here are some special tips & insights into how the question paper is set to test all that you have learnt.
Take a note of all the important topics you need to brush up before the exam so that when the question paper arrives in front of you on the D-Day, you will be able to smile and say – Ha! I know this!
Chapter 7 – Diversity in Living Organisms
Important Topics:
1. Hierarchy of classification
2. Features of all 5 kingdoms
3. Important characteristics of subdivisions of kingdom plantae and animalia
Method for Quick Understanding:
1. You need to know about the basics of classification and the different criteria of classification.
| MERITNATION TIPS: a) You must know about the five kingdom classification because it is asked quite often in the exams. b) With that you must also know the basic features of all the five kingdoms and the name of scientist who proposed this classification. c) You must know about at least 5 features of every kingdom, then you will be able to handle any question from this chapter. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 13 – Why do we fall ill
Important Topics:
1. Definition of health
2. Difference between healthy and disease-free, acute and chronic diseases, and infectious and noninfectious diseases
3. Causative agents of sleeping sickness, kala-azar, ascariasis and AIDS
4. Brief note on AIDS
5. Treatment and prevention of common diseases
Method for Quick Understanding:
1. The difference between infectious and noninfectious diseases. Causative agents of some of the most common diseases.
| MERITNATION TIPS: a) The different modes of transmission of various diseases is also asked frequently. b) Another topic from where the questions are asked is the defense mechanism of our body against them. |
Chapter 14 – Natural Resources
Important Topics:
1. Air and water pollution
2. Biogeochemical cycles
3. Greenhouse effect and ozone layer depletion
Method for Quick Understanding:
1. The phenomenon behind formation of rain should be clear to you.
2. You must be able to write about water and its importance.
| MERITNATION TIPS: a) The process of soil formation and the importance of soil is another topic which is very favorite of teachers who set the question paper. b) Various types of pollution like air, water and soil should be clear. c) The corresponding effects of the pollution like greenhouse effect and Ozone depletion often come under as short answer type questions. d) You must know about various cycles. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 3 – Atoms and Molecules
Important Topics:
1. Laws of chemical combination
a) Law of conservation of mass
b) Law of constant proportions
2. Dalton’s Atomic Theory
3. Symbols of atoms of different elements
4. Atomic mass
5. Types of molecules
a) Molecules of elements
b) Molecules of compounds
6. Ions
7. Rules for writing chemical formulae
8. Calculation of molecular mass
9. Mole concept
Method for Quick Understanding:
1. Understand and learn law of chemical combination and postulates of Dalton’s atomic theory.
2. Learn the symbols of all the atoms given in NCERT textbook.
| MERITNATION TIPS: a) Develop a clear understanding of mole concept as this is the most important topic of the chapter. b) Practice questions on mole concept and writing chemical formulae to excel the topics as they are examiner’s favourite topics. |
Chapter 4 – Structure of the Atom
Important Topics:
1. Thomson’s model of an atom
2. Rutherford’s model of an atom
3. Bohr’s model of atom
4. Distribution of electrons into different orbits
5. Valency
6. Atomic number and mass number
7. Isotopes and Isobars
Method for Quick Understanding:
1. Compare and learn postulates and drawbacks of all the atomic models.
| MERITNATION TIPS: a) Understand and compare the properties of electron, proton and neutron by making a table. b) Understand the rules for distribution of electrons into different orbits and practise lots of examples. c) Understand the concept of valency and practise the questions related to it. d) While attempting questions related to atomic models draw the diagrams also. e) Develop a clear understanding of atomic number and mass number. f) Practise is very important to score good. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
Chapter 11 – Work and Energy
Important Topics:
1. Work
2. Potential Energy
3. Kinetic Energy
4. Power and Commercial Units
Method for Quick Understanding:
1. We require energy to do our daily activities, or work but according to science, work is defined in quite a different manner. Here, work is defined as product of force and displacement or it is said to be done when an object is displaced in the direction of applied force.
2. An object which is capable of doing work posses energy. The energy possessed by an object due to its motion is kinetic energy. The energy possessed by an object due to its position is known as potential energy. The sum of kinetic and potential energy is known as mechanical energy.
3. According to law of conservation of energy, energy is always transferred from one form to another and is always same before and after transformation. Power is the rate of doing work.
| MERITNATION TIPS: a) All the topics are very much connected to our day-to-day life. Observe different activities going around you and try to calculate the nature of work done. b) Note down the energy transformations taking place. Numericals from the topics: kinetic energy , potential energy, power, work done are frequently asked. c) Conversion and calculation of commercial unit and electricity bill evaluation question are also asked. d) Check your monthly electricity units with help of your parents, estimate the bill and compare with original electricity bill. This will give you more clear idea of commercial units and usage. |
Chapter 12 – Sound
Important Topics:
1. Production and Propagation of Sound
2. Sound Waves & its Characteristics
3. Reflection of Sound
4. Sonar and other Applications of Sound
5. Structure of Human Ear
Method for Quick Understanding:
1. Sound is produced due to vibration of object or particles in the medium. It travels as longitudinal waves as a disturbance through a medium without the actual movement of the particles in the medium.
2. Sound waves follow the laws of reflection. Sound waves are associated with characteristics like wavelength, frequency and time period. quality of sound, pitch and loudness etc., depends on the same characteristics.
3. The audible range of sound for human is 20 Hz – 20 KHZ. The sound waves with frequency higher than audible range is ultrasonic and lower than audible range is infrasonic.
4. Sonar is used to determine the depth of sea and sea hill etc.
| MERITNATION TIPS: a) The important topics mentioned above require intensive reading and conceptual understanding. b) Try to observe the vibrations in a tuning fork and dip it in the water. Try producing sound by different methods like scratching, plucking rubbing, shaking etc. c) Observe different musical instrument and list down the methods by which sound is produced by them. d) Try to observe the echos in an empty room or hall with different sounds. e) Practise numericals from the topic- sound wave characteristics and sonar. |
RECOMMENDED RESOURCES: Revision Notes | Sample Papers | Textbook Solutions | Ask & Answer
All the best with your SA2 revisions and exams!
Please take a moment to spread these tips with your friends. After all, Knowledge is the only thing that grows when shared! 🙂
Add Comment Total Comments (13)
1. Hritik | February 12th, 2017 at 3:28 pm
But these tips r also amazing
2. Hritik | February 12th, 2017 at 3:26 pm
Thrust and pressure and beyond that is also coming in SA2
3. janfishan t | March 15th, 2016 at 2:59 pm
thanks a lot to meritnation team you are the best
4. Shumaila | March 15th, 2016 at 6:46 am
Simply amazing…♥
5. Tushar Awasthi | March 11th, 2016 at 9:03 pm
Thank you for the wonderful tips…..
All the best to all….
6. POOJA | February 21st, 2016 at 9:57 pm
PLEASE EXPERTS CAN YOU GIVE US IMPORTANT NOTES AND MERITNATION TIPS OF CHAPTER GRAVITATION(FLOTATION) FOR S.A.2 EXAM PLEASE ITS URGENT ITS ALSO COMING…
7. shalmina | February 15th, 2016 at 10:36 pm
Thank you at from my best expectations meritnation!!!!
8. Shaffron | February 12th, 2016 at 6:49 pm
thanks Meritnation
9. Mahesh | February 12th, 2016 at 1:25 pm
Thanks Meritnation.
10. Samana Sam | February 10th, 2016 at 9:44 pm
Thanks a lot to Team Meritnation.
11. Meritnation | February 3rd, 2016 at 5:42 pm
Hi Bhumi,
Don’t forget to share the tips with your friends. 🙂
All the Best!
Team Meritnation
12. bhumi | February 3rd, 2016 at 5:20 pm
thanks meritnation team for telling us………..
13. teertha | February 2nd, 2016 at 7:32 pm
it is sooo helpful……thank you meritnation…..
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