Science Class 9

1. Measurement 4 Minutes _Free

2. Physical Quantities (fundamental and derived) 8 Minutes _Free

3. Units 6 Minutes _Free

4. Characteristics of Units 8 Minutes _Free

5. Standard system of units and advantages of S.I. unit 11 Minutes _Free

6.Fundamental units and derived unit 16 Minutes _Free

7. Example 1 of units 2 Minutes _Free

1. Force 3 Minutes

2. Effects of Force 8 Minutes

3. Balanced and Unbalanced forces 6 Minutes

4. Distance travelled and displacement 10 Minutes

5. Speed 6 Minutes

6. Velocity 4 Minutes

7. Uniform and non-uniform Velocity 4 Minutes

8. Average velocity 4 Minutes

9. Acceleration 10 Minutes

10. Use of graphs in physics 18 Minutes

11. Equation of motion (first equation) 9 Minutes

12. Equation of motion(Second equation) 8 Minutes

13. Equation of motion(Third equation) 9 Minutes

14. Equation of motion(Fourth equation) 10 Minutes

15. Application of equations of motion 15 Minutes

16. Problem 1 3 Minutes

17. Problem 2 3 Minutes

18. Problem 3 (How high can you throw (put question mark here)) 6 Minutes

19. Problem 4 Will the train collide(put question mark here) 11 Minutes

20. Inertia 7 Minutes

21. Momentum 5 Minutes

22. Newton's Law of motion(First Law) 4 Minutes

23. Examples of Newton's first law 6 Minutes

24. Newton's Law of motion(Second Law) 10 Minutes

25. Examples of Newton's second law of motion 13 Minutes

26. Problem 1 Newton's second law 5 Minutes

27. Problem 2-How airbags work(put question mark here) 10 Minutes

28. Newton's third law of motion 6 Minutes

29. Examples of third law of motion 6 Minutes

1. Simple machines 3 Minutes

2. Advantages of simple machines 2 Minutes

3. Mechanical Advantage 2 Minutes

4. Velocity Ratio 5 Minutes

5. Efficiency 7 Minutes

6. Ways to increase efficiency of a machine 3 Minutes

7.Relationship between MA, VR and efficiency 5 Minutes

8.Principles of simple machines 5 Minutes

9.Lever 5 Minutes

10.Problem 1 (MA, VR and η of a lever) 12 Minutes

11.Pulley 7 Minutes

12.Problem 1 (MA, VR and η of a pulley) 8 Minutes

13.Inclined plane 4 Minutes

14.Problem 1 (MA, VR and η of a inclined plane) 3 Minutes

15.Wheel and axle 6 Minutes

16.Problem 1 (Ma, VR and η of a wheel and axle) 5 Minutes

17.Wheel and axle as a continuous lever 3 Minutes

18.Screw and wedge wala video 6 Minutes

19.Moment of force 8 Minutes

20.Mathematical description of moment of force 18 Minutes

21.Law of moment 6 Minutes

22.Problem 1 (Law of moment) 9 Minutes

23.Problem 2 (Law of moment) 6 Minutes

1. Work 13 Minutes

2. Definition of one joule work 4 Minutes

3. Work against friction 5 Minutes

4. Example 1 (Work done against friction) 4 Minutes

5. work against gravity 4 Minutes

6. Problem 1 5 Minutes

7. Energy 10 Minutes

8. Mechanical energy 9 Minutes

9. Example 1(Kinetic energy) 3 Minutes

10. Problem 2(Kinetic energy) 8 Minutes

11. Potential energy 7 Minutes

12. Example 1(Potential energy) 6 Minutes

13. Electrical energy 5 Minutes

14. Heat energy 6 Minutes

15. Light energy 2 Minutes

16. Sound energy 4 Minutes

17. Magnetic energy 3 Minutes

18. Chemical energy 3 Minutes

19. Nuclear energy 5 Minutes

20. Relation between work and energy 7 Minutes

21. Power 5 Minutes

22. What is one watt power ? 5 Minutes

23. Example 1(Power) 4 Minutes

1. Introduction to sound 4 Minutes

2. Properties of sound wave 5 Minutes

3. Sound wave 8 Minutes

4. Wave motion and some terms related to wave motion 14 Minutes

5. Relationship between time period and frequency 4 Minutes

6. Problem 1 (Wave motion) 2 Minutes

7. Problem 2 (Wave motion) 3 Minutes

8. Problem 3 (Wave motion) 7 Minutes

9. Speed of sound in different media at 0 degree C 6 Minutes

10. Factors effecting speed of sound in a gas medium 7 Minutes

11. Problem 1 (Factors effecting speed of sound) 4 Minutes

12. Audibility 8 Minutes

13. Applications of ultrasound 4 Minutes

14. Characteristics of notes(Pitch) 7 Minutes

15. Characteristics of notes(Intensity of sound) 10 Minutes

16. Average intensity level 5 Minutes

17. Factors effecting intensity of sound 3 Minutes

18. Characteristics of notes(Quality) 3 Minutes

19. Reflection of sound 2 Minutes

20. Echo 6 Minutes

21. Reverberation 4 Minutes

22. Refraction of sound 7 Minutes

23. Noise and music 2 Minutes

1. Light energy 4 Minutes

2. Refraction of light 5 Minutes

3. Optical medium 10 Minutes

4. Laws of refraction of light(First law) 4 Minutes

5. Laws of refraction of light(Second law) 7 Minutes

6. Problem 1 (Refraction of light) 3 Minutes

7. Problem 2 (Refraction of light) 5 Minutes

8. Examples of refraction of light 13 Minutes

9. Why does path of light bend ? 12 Minutes

10. Real depth and apparent depth 4 Minutes

11. Example 1 (Real depth and apparent depth) 2 Minutes

12. Critical angle 7 Minutes

13. Example 1 (Critical angle) 5 Minutes

14. Total internal reflection 9 Minutes

15. Example 1 (Total internal reflection) 4 Minutes

16. Why diamonds shine but glass or water does not ? 7 Minutes

17. Prisms 14 Minutes

18. How rainbow is formed in the atmosphere ? 10 Minutes

19. Electromagnetic spectrum 16 Minutes

20. Visible and infrared light 10 Minutes

21. Radio waves and ultraviolet radition 6 Minutes

22. X-rays 4 Minutes

1. Electrical energy 4 Minutes

2. Electric current 6 Minutes

3. Electromotive force and potential difference 8 Minutes

4. Electric resistance 6 Minutes

5. Conductors, Semi-conductors and insulators 5 Minutes

6. Factors effecting resistance in metals 6 Minutes

7. Resistance formula 8 Minutes

8. Ohm's law 9 Minutes

9. Problem 1 7 Minutes

10. Problem 2 9 Minutes

11. Problem 3 5 Minutes

12. Problem 4 9 Minutes

13. Magnet 6 Minutes

14. Properties of magnetic lines of forces 5 Minutes

15. Neutral point 5 Minutes

16. Terrestrial magnetism 7 Minutes

17. Magnetic elements of the earth's magnetic field 10 Minutes

1. Pure substance and impure substance 8 Minutes

2. Elements 8 Minutes

3. Metals, non metals and metalloids 6 Minutes

4. Compounds 5 Minutes

5. Molecule 4 Minutes

6. Atom 6 Minutes

7. Shells, subshells and orbitals 15 Minutes

8. 3D Visualisation of Shells, subshells and orbitals 10 Minutes

9. Electronic configuration 14 Minutes

10. Aufbau principle 9 Minutes

11. Valence shell and valence electrons 3 Minutes

12. Information from valence electrons 4 Minutes

13. Valency 5 Minutes

14. Variable valency 4 Minutes

15. Radicals 5 Minutes

16. Valency of electropositive radicals 4 Minutes

17. Valency of electronegative radicals 3 Minutes

18. Ions 6 Minutes

19. Inert gases 8 Minutes

20. Duplet rule and octet rule 19 Minutes

21. Chemical bonding 5 Minutes

22. Electrovalent bond 8 Minutes

23. Example of electrovalent bond(Magnesium chloride) 4 Minutes

24. Characteristics of electrovalent bond 4 Minutes

25. Covalent bond 14 Minutes

26. Characteristics of covalent compounds 4 Minutes

27. Molecular formula of compounds and elements 4 Minutes

28. Infomation given by a molecular formula 4 Minutes

29. Steps of writing molecular formula of compounds 13 Minutes

1. Physical change and chemical change 7 Minutes

2. Chemical reaction 6 Minutes

3. Chemical equation 8 Minutes

4. Drawbacks of skeletal chemical equation 3 Minutes

5. Writing and balancing chemical equations 17 Minutes

6. Information conveye by a balanced chamical equation 4 Minutes

7. Limitations of chemical equations 7 Minutes

8. Endothermic and exothermic reaction 6 Minutes

9. Catalyst 4 Minutes

10. Characteristics of catalyst 4 Minutes

1. Solution 6 Minutes

2. Unsaturated and saturated solution 5 Minutes

3. Supersaturated solution 4 Minutes

4. Importance of solution 3 Minutes

5. Solubility of a substance 6 Minutes

6. Effect of heat on solubility 3 Minutes

7. Solubility curve 4 Minutes

8. Crystals 2 Minutes

9. Characteristics of crystals 2 Minutes

10. Crystallization 3 Minutes

11. Problem 1 3 Minutes

12. Problem 2 7 Minutes

13. Problem 3 12 Minutes

1. Atmosphere 5 Minutes

2. Hydrogen gas 5 Minutes

3. General methods of preparation for hydrogen gas 9 Minutes

4. Laboratory preparation of hydrogen gas 11 Minutes

5. manufacture of hydrogen 4 Minutes

6. Nascent hydrogen 2 Minutes

7. Physical properties of hydrogen gas 4 Minutes

8. Chemical properties of hydrogen gas 13 Minutes

9. Uses of hydrogen gas 3 Minutes

10. Oxygen 7 Minutes

11. General methods of preparation of oxygen gas 3 Minutes

12. Laboratory preparation of oxygen gas (With heat) 6 Minutes

13. Laboratory preparation of oxygen gas (Without using heat) 5 Minutes

14. Test of oxygen gas 3 Minutes

15. Manufacture of oxygen gas 2 Minutes

16. Physical properties of oxygen gas 4 Minutes

17. Chemical properties of oxygen gas 12 Minutes

18. Uses of oxygen gas 3 Minutes

19. Nitrogen 7 Minutes

20. General method of preparation of nitrogen gas 3 Minutes

21. Laboratory preparation o nitrogen gas 7 Minutes

22. Test of nitrogen gas 2 Minutes

23. Manufacture of nitrogen gas 2 Minutes

24. Physical properties of nitrogen gas 3 Minutes

25. Chemical properties of nitrogen gas 5 Minutes

26. Uses of nitrogen gas 4 Minutes

1. Metals 5 Minutes

2. General properties of metals 11 Minutes

3. Alloy 5 Minutes

4. Electron sea model of metals 7 Minutes

5. Some questions answered by electron sea model 6 Minutes

6. Chemical properties of metals 6 Minutes

7. Metalloids 3 Minutes

8. Role of metals for organisms 7 Minutes

9. Importance of zinc 4 Minutes

10. Importance of sodium and potassium 4 Minutes

11. Harmful effects pf mercury 3 Minutes

12. Harmful effects of lead 5 Minutes

1. Carbon in common materials 5 Minutes

2. Sources of carbon 5 Minutes

3. Nature of carbon 6 Minutes

4. Allotropy of carbon 7 Minutes

5. Diamond 4 Minutes

6. Uses of diamond 1 Minutes

7. Graphite 4 Minutes

8. Uses of graphite 2 Minutes

9. Chemical properties of carbon 7 Minutes

10. Organic and inorganic compounds 4 Minutes

1. Sources of water 8 Minutes

2. Sources of ground water 4 Minutes

3. Physical properties of water 10 Minutes

4. Capillary action 3 Minutes

5. Chemical properties of water 8 Minutes

6. Solvent property of water 8 Minutes

7. Uses of water 3 Minutes

8. Types of water 2 Minutes

9. Why does hard water not form lather easily ? 4 Minutes

10. Types of hard water 2 Minutes

11. Temporary hardness and its removal 5 Minutes

12. Permanent hardness of water and its removal 4 Minutes

13. Permutits process 5 Minutes

14. Advantages and disadvantages of hard water 2 Minutes

1. Fertilizers 3 Minutes

2. Organic fertilizers 4 Minutes

3. Advantages of organic fertilizers 2 Minutes

4. Disadvantages of organic fertilizers 2 Minutes

5. Inorganic fertilizers 5 Minutes

6. Phosphorus fertilizers 5 Minutes

7. Potassium fertilizers 4 Minutes

8. Types of chemical fetilizers 4 Minutes

9. Advantages of chemical fertilizers 2 Minutes

10. Disadvantages of chemical fertilizers 2 Minutes

11. Precautions while using chemical fertilizers 4 Minutes

12. Difference between organic fertilizers and inorganic fertilizers 2 Minutes

1. Classification of plants and animals 4 Minutes

2. Importance of classification 5 Minutes

3. Heirarchy of classification 8 Minutes

4. Nomenclature 6 Minutes

5. Five-kingdom system of classification 7 Minutes

6. Kingdom: Monera 4 Minutes

7. Kingdom: Protista 4 Minutes

8. Kingdom: Plantae 3 Minutes

9. Kingdom: Fungi 3 Minutes

10. Kingdom: Animalia 4 Minutes

11. Kingdom: Plantae and its divisions 3 Minutes

12. Division: Algae 5 Minutes

13. Division: Bryophyta 4 Minutes

14. Division: Tracheophyta and its sub-division Pteridophyta 8 Minutes

15. Sub-division: Gymnosperms 4 Minutes

16. Sub-division: Angiosperms 5 Minutes

17. Class: Monocotyledons 5 Minutes

18. Class: Dicotyledons 6 Minutes

19. Way of writing classification of plants 10 Minutes

20. Kingdom: Animalia 5 Minutes

21. Phylum: Porifera 8 Minutes

22. Phylum: Coelenterata 6 Minutes

23. Phylum: Platyhelminthes 5 Minutes

24. Phylum: Nemathelminthes 6 Minutes

25. Phylum: Annelida 5 Minutes

26. Phylum: Arthropoda 10 Minutes

27. Phylum: Mollusca 4 Minutes

28. Phylum: Echinodermata 4 Minutes

29. Phylum: Chordata 9 Minutes

30. Sub-phylum: Vertebrata 6 Minutes

31. Class: Pisces 4 Minutes

32. Class: Amphibian 4 Minutes

33. Class: Reptilia 4 Minutes

34. Class: Aves 5 Minutes

35. Class: Mammals 10 Minutes

36. Classification of Animals 17 Minutes

37. Mosquito 6 Minutes

38. Structure of mosquito 5 Minutes

39. Difference between Male and Female 2 Minutes

40. Lifecycle of a mosquito 3 Minutes

41. Larva of mosquito 5 Minutes

42. Papa of mosquito 3 Minutes

43. Adult stage of mosquito 5 Minutes

44. Disadvantage of mosquito 6 Minutes

45. Control measure of mosquito 5 Minutes

1. Adaptation 6 Minutes

2. Aquatic adaptation 6 Minutes

3. Adaptive characteristics of hydrophytes 5 Minutes

4. Aquatic animals and their adaptive characteristics 8 Minutes

5. Terrestrial animals 5 Minutes

6. Xerophytes and their adaptational characteristics 5 Minutes

7. Terrestrial animals and their adaptational characteristics 4 Minutes

8. Fossorial and arboreal animals and their adaptational characteristics 4 Minutes

9. Aerial and desert animals and their adaptational characteristics 6 Minutes

10. Microorganisms 3 Minutes

11. A. Bacterias 7 Minutes

12. Types of bacterias 6 Minutes

13. Advantages of bacterias 4 Minutes

14. Disadvantages of bacterias and control measures of bacterial diseases 6 Minutes

15. B. Fungi 5 Minutes

16. Advantages of fungi 4 Minutes

17. Disadvantages of fungi and control measures of fungi 5 Minutes

18. C. Viruses 5 Minutes

19. Characteristics of viruses 6 Minutes

20. Advantages of virus 4 Minutes

21. Disadvantages and control measures of virus 4 Minutes

22. D. Protozoans 5 Minutes

23. Control measures of protozoans 2 Minutes

1. Plant tissue 5 Minutes

2. Lateral meristem and intercalary meristem 4 Minutes

3. Permanent tissue 5 Minutes

4. Collenchyma and sclerenchyma 5 Minutes

5. Complex permanent tissues 5 Minutes

6. Special permanent tissues 5 Minutes

7. Human skeleton system 6 Minutes

8. Structure of a bone 5 Minutes

9. Types of skeleton 11 Minutes

10. Axial skeleton (Cranium and facial bones) 10 Minutes

11. Cranium and facial bones demonstration 11 Minutes

12. Ear Ossicles 5 Minutes

13. Bones of trunk (Thoracic bones and Vertebral bones) 8 Minutes

14. Appendicular skeleton (Bones of upper extremity) 7 Minutes

15. Bones of lower extremity 7 Minutes

16. Functions of skeleton system 4 Minutes

17. Digestive system 4 Minutes

18. Digestion in human body 6 Minutes

19. Digestion in duodenum and small intestine 6 Minutes

20. Summary of digestivive system 5 Minutes

21. Importance of digestive system 2 Minutes

22. Respiratory system 4 Minutes

23. Different organs involved in respiration 5 Minutes

24. Lungs and diaphragm 6 Minutes

25. The process of respiration 2 Minutes

26. Importance of respiratory system 3 Minutes

27. Urinary system 2 Minutes

28. Organs involved in urinary system 4 Minutes

29. Importance of excretory system 2 Minutes

1. Sense organs 2 Minutes

2. The eye 8 Minutes

3. Middle layer of an eye 9 Minutes

4. Inner layer of an eye 4 Minutes

5. Lens 3 Minutes

6. Working of the human eye 4 Minutes

7. Care and protection of eye 3 Minutes

8. Ear (Outer ear) 5 Minutes

9. Middle ear 4 Minutes

10. Inner ear 4 Minutes

11. Working mechanism of the ears 3 Minutes

12. Care and protection of ears 4 Minutes

13. Tongue 6 Minutes

14. Care and protection of the tongue 2 Minutes

15. The skin 6 Minutes

16. Care and protection of the skin 2 Minutes

17. Nose 4 Minutes

18. Care and protection of the nose 3 Minutes

1. Evolution 9 Minutes

2. Organic evolution 2 Minutes

3. Evidence from fossils or paleontological evidence 6 Minutes

4. Evidence from comparative morphology and anatomy 9 Minutes

5. Evidence from embryo or embryological evidence 4 Minutes

6. Evidence from geographical distribution of organanisms 3 Minutes

7. Evidence from brodge animals(Connecting animals) 5 Minutes

8. Theories of evolution 3 Minutes

9. Use and disuse or organs and inheritance or acquired characters 7 Minutes

10. Criticism of Lamarkism 3 Minutes

11. Darwin's theory or Darwinism 6 Minutes

12. Variation and heredity and Natural selection 5 Minutes

13. Origin of species or speciation 6 Minutes

14. Criticism of Darwinism 6 Minutes

15. A comparison of Lamarkism and Darwinism 5 Minutes

1. Introduction 2 Minutes

2. Components of the ecosystem 2 Minutes

3. Biotic components 3 Minutes

4. Consumers 3 Minutes

5. Decomposers 4 Minutes

6. Trophic levels 4 Minutes

7. Food chain 3 Minutes

8. Food web 3 Minutes

9. Interrelationship between plants and animals and autotrophs 4 Minutes

10. Heterotrophs and different modes of nutrition 7 Minutes

11. Ecosystem and Pond ecosystem 7 Minutes

12. Land ecosystem 6 Minutes

13. Ecosystem services 3 Minutes

14. Regulating services, Cultural services and Supporting services 6 Minutes

15. Basic requirements of human beings and Adverse impacts of climate change on ecosystem 5 Minutes

1. Natural Disasters 2 Minutes

2. Hazards and disasters 2 Minutes

3. Management of natural disasters and management of anthropogenic disasters 7 Minutes

4. Distance management cycle 5 Minutes

5. Avalanche 5 Minutes

6. Preventive measures of avalanche 3 Minutes

7. Glacial Lake Outburst Flood(GLOF) 4 Minutes

8. Effects of GLOF and preventive measures of GLOF 4 Minutes

9. Hurricanes 4 Minutes

10. Causes of hurricanes 4 Minutes

11. Effects of hurricanes 3 Minutes

12. Preventive measures against a hurricane 4 Minutes

1. Greenhouse 4 Minutes

2. Advantages and disadvantages of greenhouse effect 4 Minutes

3. Artificial greenhouse 2 Minutes

4. Importance of artificial greenhouse 2 Minutes

5. Climate change 3 Minutes

6. Causes of climate change 5 Minutes

7. Effects of climate change 6 Minutes

8. Measures of management of climate change 6 Minutes

1. Astronomical unit and Light year 7 Minutes

2. Parsec 5 Minutes

3. Solar system 8 Minutes

4. Interrelation among the Sun, the Earth and the Moon 6 Minutes

5. Diurnal motion of the Earth 7 Minutes

6. Annual motion of the Earth 4 Minutes

7. Phases of Moon 6 Minutes

8. Sidereal and Synodic month 7 Minutes

9. Eclipse 5 Minutes

10. Umbra and Penumbra 7 Minutes

11. Solar eclipse 4 Minutes

12. Lunar eclipse 6 Minutes

13. The Lunar nodes 5 Minutes