Science 9

"Compulsory Science class 9 videos according to Curriculum Development Centre, Nepal Designed for class 9 Students."

Intermediate 0 (0 Review ) 387 Students enrolled
Created by Mero School Last updated Fri, 14-May-2021 Nepali
What will i learn?
  • After Completion of this Course, Students will get complete knowledge of class 9 Compulsory Science and will be able to secure good score in the exam.

Curriculum for this course
434 Lessons 43:40:24 H:M:S
0. Introduction To Science
1 Lessons 00:05:20 H:M:S
  • Specification grid 00:05:20
  • 1. Measurement 00:04:02
  • 2. Physical Quantities (fundamental and derived) 00:08:41
  • 3. Units 00:06:08
  • 4. Characteristics of Units 00:08:54
  • 5. Standard system of units and advantages of S.I. unit 00:11:42
  • 6.Fundamental units and derived unit 00:16:02
  • 7. Example 1 of units 00:02:59
  • 1. Force 00:03:40
  • 2. Effects of Force 00:08:48
  • 3. Balanced and Unbalanced forces 00:06:28
  • 4. Distance travelled and displacement 00:10:09
  • 5. Speed 00:06:03
  • 6. Velocity 00:04:45
  • 7. Uniform and non-uniform Velocity 00:04:37
  • 8. Average velocity 00:04:41
  • 9. Acceleration 00:10:29
  • 10. Use of graphs in physics 00:18:56
  • 11. Equation of motion (first equation) 00:09:00
  • 12. Equation of motion(Second equation) 00:08:17
  • 13. Equation of motion(Third equation) 00:09:05
  • 14. Equation of motion(Fourth equation) 00:10:12
  • 1. Simple machines 00:03:45
  • 2. Advantages of simple machines 00:02:50
  • 3. Mechanical Advantage 00:02:37
  • 4. Velocity Ratio 00:05:41
  • 5. Efficiency 00:07:37
  • 6. Ways to increase efficiency of a machine 00:03:08
  • 7.Relationship between MA, VR and efficiency 00:05:15
  • 8.Principles of simple machines 00:05:11
  • 9.Lever 00:05:53
  • 10.Problem 1 (MA, VR and η of a lever) 00:12:01
  • 11.Pulley 00:07:11
  • 12.Problem 1 (MA, VR and η of a pulley) 00:08:39
  • 13.Inclined plane 00:04:42
  • 14.Problem 1 (MA, VR and η of a inclined plane) 00:03:37
  • 15.Wheel and axle 00:06:17
  • 16.Problem 1 (Ma, VR and η of a wheel and axle) 00:05:44
  • 17.Wheel and axle as a continuous lever 00:03:01
  • 18.Screw and wedge wala video 00:06:17
  • 19.Moment of force 00:08:40
  • 20.Mathematical description of moment of force 00:18:29
  • 21.Law of moment 00:06:48
  • 22.Problem 1 (Law of moment) 00:09:56
  • 23.Problem 2 (Law of moment) 00:06:14
  • 1. Work 00:13:34
  • 2. Definition of one joule work 00:04:17
  • 3. Work against friction 00:05:01
  • 4. Example 1 (Work done against friction) 00:04:24
  • 5. work against gravity 00:04:34
  • 6. Problem 1 00:05:36
  • 7. Energy 00:10:36
  • 8. Mechanical energy 00:09:04
  • 9. Example 1(Kinetic energy) 00:03:37
  • 10. Problem 2(Kinetic energy) 00:08:49
  • 11. Potential energy 00:07:22
  • 12. Example 1(Potential energy) 00:06:45
  • 13. Electrical energy 00:05:25
  • 14. Heat energy 00:06:49
  • 15. Light energy 00:02:42
  • 16. Sound energy 00:04:19
  • 17. Magnetic energy 00:03:24
  • 18. Chemical energy 00:03:54
  • 19. Nuclear energy 00:05:25
  • 20. Relation between work and energy 00:07:33
  • 21. Power 00:05:40
  • 22. What is one watt power ? 00:05:45
  • 23. Example 1(Power) 00:04:34
  • 1. Introduction to sound 00:04:39
  • 2. Properties of sound wave 00:05:04
  • 3. Sound wave 00:08:16
  • 4. Wave motion and some terms related to wave motion 00:14:06
  • 5. Relationship between time period and frequency 00:04:37
  • 6. Problem 1 (Wave motion) 00:02:53
  • 7. Problem 2 (Wave motion) 00:03:52
  • 8. Problem 3 (Wave motion) 00:07:20
  • 9. Speed of sound in different media at 0 degree C 00:06:17
  • 10. Factors effecting speed of sound in a gas medium 00:07:05
  • 11. Problem 1 (Factors effecting speed of sound) 00:04:46
  • 12. Audibility 00:08:20
  • 13. Applications of ultrasound 00:04:26
  • 14. Characteristics of notes(Pitch) 00:07:52
  • 15. Characteristics of notes(Intensity of sound) 00:10:41
  • 16. Average intensity level 00:05:06
  • 17. Factors effecting intensity of sound 00:03:25
  • 18. Characteristics of notes(Quality) 00:03:15
  • 19. Reflection of sound 00:02:12
  • 20. Echo 00:06:01
  • 21. Reverberation 00:04:54
  • 22. Refraction of sound 00:07:14
  • 23. Noise and music 00:02:56
  • 1. Light energy 00:04:05
  • 2. Refraction of light 00:05:27
  • 3. Optical medium 00:10:09
  • 4. Laws of refraction of light(First law) 00:04:33
  • 5. Laws of refraction of light(Second law) 00:07:22
  • 6. Problem 1 (Refraction of light) 00:03:57
  • 7. Problem 2 (Refraction of light) 00:05:52
  • 8. Examples of refraction of light 00:13:07
  • 9. Why does path of light bend ? 00:12:00
  • 10. Real depth and apparent depth 00:04:42
  • 11. Example 1 (Real depth and apparent depth) 00:02:40
  • 12. Critical angle 00:07:49
  • 13. Example 1 (Critical angle) 00:05:40
  • 14. Total internal reflection 00:09:53
  • 15. Example 1 (Total internal reflection) 00:04:34
  • 16. Why diamonds shine but glass or water does not ? 00:07:17
  • 17. Prisms 00:14:57
  • 18. How rainbow is formed in the atmosphere ? 00:10:26
  • 19. Electromagnetic spectrum 00:16:11
  • 20. Visible and infrared light 00:10:07
  • 21. Radio waves and ultraviolet radition 00:06:46
  • 22. X-rays 00:04:43
  • 1. Electrical energy 00:04:15
  • 2. Electric current 00:06:13
  • 3. Electromotive force and potential difference 00:08:23
  • 4. Electric resistance 00:06:08
  • 5. Conductors, Semi-conductors and insulators 00:05:47
  • 6. Factors effecting resistance in metals 00:06:08
  • 7. Resistance formula 00:08:12
  • 8. Ohm's law 00:09:17
  • 9. Problem 1 00:07:05
  • 10. Problem 2 00:09:02
  • 11. Problem 3 00:05:23
  • 12. Problem 4 00:09:59
  • 13. Magnet 00:06:18
  • 14. Properties of magnetic lines of forces 00:05:20
  • 15. Neutral point 00:05:26
  • 16. Terrestrial magnetism 00:07:05
  • 17. Magnetic elements of the earth's magnetic field 00:10:52
  • 1. Pure substance and impure substance 00:08:52
  • 2. Elements 00:08:12
  • 3. Metals, non metals and metalloids 00:06:07
  • 4. Compounds 00:05:27
  • 5. Molecule 00:04:12
  • 6. Atom 00:06:28
  • 7. Shells, subshells and orbitals 00:15:22
  • 8. 3D Visualisation of Shells, subshells and orbitals 00:10:24
  • 9. Electronic configuration 00:14:37
  • 10. Aufbau principle 00:09:51
  • 11. Valence shell and valence electrons 00:03:39
  • 12. Information from valence electrons 00:04:30
  • 13. Valency 00:05:12
  • 14. Variable valency 00:04:49
  • 15. Radicals 00:05:04
  • 16. Valency of electropositive radicals 00:04:38
  • 17. Valency of electronegative radicals 00:03:40
  • 18. Ions 00:06:56
  • 19. Inert gases 00:08:24
  • 20. Duplet rule and octet rule 00:19:17
  • 21. Chemical bonding 00:05:48
  • 22. Electrovalent bond 00:08:07
  • 23. Example of electrovalent bond(Magnesium chloride) 00:04:13
  • 24. Characteristics of electrovalent bond 00:04:39
  • 25. Covalent bond 00:14:11
  • 26. Characteristics of covalent compounds 00:04:22
  • 27. Molecular formula of compounds and elements 00:04:37
  • 28. Infomation given by a molecular formula 00:04:14
  • 29. Steps of writing molecular formula of compounds 00:13:03
  • 1. Physical change and chemical change 00:07:30
  • 2. Chemical reaction 00:06:22
  • 3. Chemical equation 00:08:51
  • 4. Drawbacks of skeletal chemical equation 00:03:42
  • 5. Writing and balancing chemical equations 00:17:45
  • 6. Information conveye by a balanced chamical equation 00:04:59
  • 7. Limitations of chemical equations 00:07:47
  • 8. Endothermic and exothermic reaction 00:06:36
  • 9. Catalyst 00:04:30
  • 10. Characteristics of catalyst 00:04:00
  • 1. Solution 00:06:22
  • 2. Unsaturated and saturated solution 00:05:49
  • 3. Supersaturated solution 00:04:49
  • 4. Importance of solution 00:03:23
  • 5. Solubility of a substance 00:06:43
  • 6. Effect of heat on solubility 00:03:26
  • 7. Solubility curve 00:04:25
  • 8. Crystals 00:02:52
  • 9. Characteristics of crystals 00:02:41
  • 10. Crystallization 00:03:47
  • 11. Problem 1 00:03:26
  • 12. Problem 2 00:07:22
  • 13. Problem 3 00:12:36
  • 1. Atmosphere 00:05:14
  • 2. Hydrogen gas 00:05:22
  • 3. General methods of preparation for hydrogen gas 00:09:40
  • 4. Laboratory preparation of hydrogen gas 00:11:26
  • 5. manufacture of hydrogen 00:04:32
  • 6. Nascent hydrogen 00:02:30
  • 7. Physical properties of hydrogen gas 00:04:48
  • 8. Chemical properties of hydrogen gas 00:13:52
  • 9. Uses of hydrogen gas 00:03:04
  • 10. Oxygen 00:07:40
  • 11. General methods of preparation of oxygen gas 00:03:20
  • 12. Laboratory preparation of oxygen gas (With heat) 00:06:15
  • 13. Laboratory preparation of oxygen gas (Without using heat) 00:05:50
  • 14. Test of oxygen gas 00:03:00
  • 15. Manufacture of oxygen gas 00:02:51
  • 16. Physical properties of oxygen gas 00:04:06
  • 17. Chemical properties of oxygen gas 00:12:00
  • 18. Uses of oxygen gas 00:03:49
  • 19. Nitrogen 00:07:24
  • 20. General method of preparation of nitrogen gas 00:03:23
  • 21. Laboratory preparation o nitrogen gas 00:07:07
  • 22. Test of nitrogen gas 00:02:05
  • 23. Manufacture of nitrogen gas 00:02:25
  • 24. Physical properties of nitrogen gas 00:03:17
  • 25. Chemical properties of nitrogen gas 00:05:01
  • 26. Uses of nitrogen gas 00:04:04
  • 1. Metals 00:05:19
  • 2. General properties of metals 00:11:01
  • 3. Alloy 00:05:25
  • 4. Electron sea model of metals 00:07:23
  • 5. Some questions answered by electron sea model 00:06:30
  • 6. Chemical properties of metals 00:06:59
  • 7. Metalloids 00:03:08
  • 8. Role of metals for organisms 00:07:01
  • 9. Importance of zinc 00:04:40
  • 10. Importance of sodium and potassium 00:04:48
  • 11. Harmful effects pf mercury 00:03:46
  • 12. Harmful effects of lead 00:05:44
  • 1. Carbon in common materials 00:05:15
  • 2. Sources of carbon 00:05:05
  • 3. Nature of carbon 00:06:00
  • 4. Allotropy of carbon 00:07:51
  • 5. Diamond 00:04:39
  • 6. Uses of diamond 00:01:57
  • 7. Graphite 00:04:09
  • 8. Uses of graphite 00:02:01
  • 9. Chemical properties of carbon 00:07:10
  • 10. Organic and inorganic compounds 00:04:35
  • 1. Sources of water 00:08:25
  • 2. Sources of ground water 00:04:20
  • 3. Physical properties of water 00:10:20
  • 4. Capillary action 00:03:21
  • 5. Chemical properties of water 00:08:06
  • 6. Solvent property of water 00:08:59
  • 7. Uses of water 00:03:13
  • 8. Types of water 00:02:46
  • 9. Why does hard water not form lather easily ? 00:04:04
  • 10. Types of hard water 00:02:49
  • 11. Temporary hardness and its removal 00:05:31
  • 12. Permanent hardness of water and its removal 00:04:25
  • 13. Permutits process 00:05:36
  • 14. Advantages and disadvantages of hard water 00:02:46
  • 1. Fertilizers 00:03:06
  • 2. Organic fertilizers 00:04:14
  • 3. Advantages of organic fertilizers 00:02:35
  • 4. Disadvantages of organic fertilizers 00:02:12
  • 5. Inorganic fertilizers 00:05:38
  • 6. Phosphorus fertilizers 00:05:08
  • 7. Potassium fertilizers 00:04:17
  • 8. Types of chemical fetilizers 00:04:20
  • 9. Advantages of chemical fertilizers 00:02:00
  • 10. Disadvantages of chemical fertilizers 00:02:23
  • 11. Precautions while using chemical fertilizers 00:04:44
  • 12. Difference between organic fertilizers and inorganic fertilizers_1 00:02:43
  • 1. Classification of plants and animals 00:04:07
  • 2. Importance of classification 00:05:19
  • 3. Heirarchy of classification 00:08:50
  • 4. Nomenclature 00:06:29
  • 5. Five-kingdom system of classification 00:07:44
  • 6. Kingdom(put colon here) Monera 00:04:09
  • 7. Kingdom(put colon here) Protista 00:04:57
  • 8. Kingdom(put colon here) Plantae 00:03:30
  • 9. Kingdom(put colon here) Fungi 00:03:27
  • 10. Kingdom(put colon here) Animalia 00:04:18
  • 11. Kingdom(put colon here) Plantae and its divisions 00:03:51
  • 12. Division(put colon here) Algae 00:05:56
  • 13. Division(put colon here) Bryophyta 00:04:59
  • 14. Division(put colon here) Tracheophyta and its sub-division Pteridophyta 00:08:16
  • 15. Sub-division(put colon here) Gymnosperms 00:04:06
  • 16. Sub-division(put colon here) Angiosperms 00:05:11
  • 17. Class(put colon here) Monocotyledons 00:05:02
  • 18. Class(put colon here) Dicotyledons 00:06:15
  • 19. Way of writing classification of plants 00:10:08
  • 20. Kingdom(put colon here) Animalia 00:05:45
  • 21. Phylum(put colon here) Porifera 00:08:42
  • 22. Phylum(put colon here) Coelenterata 00:06:18
  • 23. Phylum(put colon here) Platyhelminthes 00:05:47
  • 24. Phylum(put colon here) Nemathelminthes 00:06:21
  • 25. Phylum(put comma here) Annelida 00:05:41
  • 26. Phylum(put comma here) Arthropoda 00:10:37
  • 27. Phylum(put comma here) Mollusca 00:04:34
  • 28. Phylum(put comma here) Echinodermata 00:04:57
  • 29. Phylum(put comma here) Chordata 00:09:05
  • 30. Sub-phylum(put comma here) Vertebrata 00:06:47
  • 31. Class(put comma here) Pisces 00:04:57
  • 32. Class(put comma here) Amphibian 00:04:46
  • 33. Class(put comma here) Reptilia 00:04:48
  • 34. Class(put comma here) Aves 00:05:49
  • 35. Class(put comma here)Mammals 00:10:46
  • 36. Classification of Animals 00:17:15
  • 37. Mosquito 00:06:28
  • 38. Structure of mosquito 00:05:56
  • 39. Difference between Male and Female 00:02:38
  • 40. Lifecycle of a mosquito 00:03:50
  • 41. Larva of mosquito 00:05:55
  • 42. Papa of mosquito 00:03:39
  • 43. Adult stage of mosquito 00:05:36
  • 44. Disadvantage of mosquito 00:06:20
  • 45. Control measure of mosquito 00:05:54
  • 1. Adaptation 00:06:29
  • 2. Aquatic adaptation 00:06:36
  • 3. Adaptive characteristics of hydrophytes 00:05:39
  • 4. Aquatic animals and their adaptive characteristics 00:08:34
  • 5. Terrestrial animals 00:05:03
  • 6. Xerophytes and their adaptational characteristics 00:05:58
  • 7. Terrestrial animals and their adaptational characteristics 00:04:42
  • 8. Fossorial and arboreal animals and their adaptational characteristics 00:04:50
  • 9. Aerial and desert animals and their adaptational characteristics 00:06:32
  • 10. Microorganisms 00:03:58
  • 11. A. Bacterias 00:07:31
  • 12. Types of bacterias 00:06:23
  • 13. Advantages of bacterias 00:04:17
  • 14. Disadvantages of bacterias and control measures of bacterial diseases 00:06:20
  • 15. B. Fungi 00:05:10
  • 16. Advantages of fungi 00:04:57
  • 17. Disadvantages of fungi and control measures of fungi 00:05:50
  • 18. C. Viruses 00:05:32
  • 19. Characteristics of viruses 00:06:34
  • 20. Advantages of virus 00:04:59
  • 21. Disadvantages and control measures of virus 00:04:21
  • 22. D. Protozoans 00:05:43
  • 23. Control measures of protozoans 00:02:55
  • 1. Plant tissue 00:05:30
  • 2. Lateral meristem and intercalary meristem 00:04:07
  • 3. Permanent tissue 00:05:11
  • 4. Collenchyma and sclerenchyma 00:05:54
  • 5. Complex permanent tissues 00:05:53
  • 6. Special permanent tissues 00:05:59
  • 7. Human skeleton system 00:06:06
  • 8. Structure of a bone 00:05:20
  • 9. Types of skeleton 00:11:24
  • 10. Axial skeleton (Cranium and facial bones) 00:10:10
  • 11. Cranium and facial bones demonstration 00:11:18
  • 12. Ear Ossicles 00:05:11
  • 13. Bones of trunk (Thoracic bones and Vertebral bones) 00:08:50
  • 14. Appendicular skeleton (Bones of upper extremity) 00:07:02
  • 15. Bones of lower extremity 00:07:16
  • 16. Functions of skeleton system 00:04:29
  • 17. Digestive system 00:04:34
  • 18. Digestion in human body 00:06:58
  • 19. Digestion in duodenum and small intestine 00:06:10
  • 20. Summary of digestivive system 00:05:48
  • 21. Importance of digestive system 00:02:50
  • 22. Respiratory system 00:04:21
  • 23. Different organs involved in respiration 00:05:11
  • 24. Lungs and diaphragm 00:06:26
  • 25. The process of respiration 00:02:22
  • 26. Importance of respiratory system 00:03:52
  • 27. Urinary system 00:02:37
  • 28. Organs involved in urinary system 00:04:10
  • 29. Importance of excretory system 00:02:54
  • 1. Sense organs 00:02:16
  • 2. The eye 00:08:46
  • 3. Middle layer of an eye 00:09:22
  • 4. Inner layer of an eye 00:04:32
  • 5. Lens 00:03:32
  • 6. Working of the human eye 00:04:00
  • 7. Care and protection of eye 00:03:41
  • 8. Ear (Outer ear) 00:05:43
  • 9. Middle ear 00:04:09
  • 10. Inner ear 00:04:03
  • 11. Working mechanism of the ears 00:03:13
  • 12. Care and protection of ears 00:04:06
  • 13. Tongue 00:06:35
  • 14. Care and protection of the tongue 00:02:27
  • 15. The skin 00:06:30
  • 16. Care and protection of the skin 00:02:40
  • 17. Nose 00:04:42
  • 18. Care and protection of the nose 00:03:49
  • 1. Evolution 00:09:13
  • 2. Organic evolution 00:02:58
  • 3. Evidence from fossils or paleontological evidence 00:06:07
  • 4. Evidence from comparative morphology and anatomy 00:09:04
  • 5. Evidence from embryo or embryological evidence 00:04:10
  • 6. Evidence from geographical distribution of organanisms 00:03:53
  • 7. Evidence from brodge animals(Connecting animals) 00:05:46
  • 8. Theories of evolution 00:03:27
  • 9. Use and disuse or organs and inheritance or acquired characters 00:07:19
  • 10. Criticism of Lamarkism 00:03:41
  • 11. Darwin's theory or Darwinism 00:06:11
  • 12. Variation and heredity and Natural selection 00:05:27
  • 13. Origin of species or speciation 00:06:27
  • 14. Criticism of Darwinism 00:06:02
  • 15. A comparison of Lamarkism and Darwinism 00:05:13
  • 1. Introduction 00:02:13
  • 2. Components of the ecosystem 00:02:11
  • 3. Biotic components 00:03:35
  • 4. Consumers 00:03:59
  • 5. Decomposers 00:04:24
  • 6. Trophic levels 00:04:24
  • 7. Food chain 00:03:53
  • 8. Food web 00:03:33
  • 9. Interrelationship between plants and animals and autotrophs 00:04:53
  • 10. Heterotrophs and different modes of nutrition 00:07:08
  • 11. Ecosystem and Pond ecosystem 00:07:30
  • 12. Land ecosystem 00:06:19
  • 13. Ecosystem services 00:03:21
  • 14. Regulating services, Cultural services and Supporting services 00:06:14
  • 15. Basic requirements of human beings and Adverse impacts of climate change on ecosystem 00:05:46
  • 1. Natural Disasters 00:02:17
  • 2. Hazards and disasters 00:02:56
  • 3. Management of natural disasters and management of anthropogenic disasters 00:07:17
  • 4. Distance management cycle 00:05:11
  • 5. Avalanche 00:05:20
  • 6. Preventive measures of avalanche 00:03:10
  • 7. Glacial Lake Outburst Flood(GLOF) 00:04:36
  • 8. Effects of GLOF and preventive measures of GLOF 00:04:08
  • 9. Hurricanes 00:04:10
  • 10. Causes of hurricanes 00:04:42
  • 11. Effects of hurricanes 00:03:20
  • 12. Preventive measures against a hurricane 00:04:00
  • 1. Greenhouse 00:04:17
  • 2. Advantages and disadvantages of greenhouse effect 00:04:43
  • 3. Artificial greenhouse 00:02:29
  • 4. Importance of artificial greenhouse 00:02:46
  • 5. Climate change 00:03:37
  • 6. Causes of climate change 00:05:26
  • 7. Effects of climate change 00:06:47
  • 8. Measures of management of climate change 00:06:51
  • 1. Astronomical unit and Light year 00:07:45
  • 2. Parsec 00:05:56
  • 3. Solar system 00:08:37
  • 4. Interrelation among the Sun, the Earth and the Moon 00:06:04
  • 5. Diurnal motion of the Earth 00:07:20
  • 6. Annual motion of the Earth 00:04:56
  • 7. Phases of Moon 00:06:55
  • 8. Sidereal and Synodic month 00:07:45
  • 9. Eclipse 00:05:23
  • 10. Umbra and Penumbra 00:07:02
  • 11. Solar eclipse 00:04:19
  • 12. Lunar eclipse 00:06:25
  • 13. The Lunar nodes 00:05:39
  • Requirements
    • Students are required to have sound knowledge of Class 8 Science, based on CDC curriculum.
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    Description

    The videos contained herein are strictly based on the Nepal CDC curriculum, promoting "e-Learning for Nepal", and are made with intention to provide guidance to the class 9 students". The course tries to cover up all the theories, necessary formula, basic chemical reactions, biological knowledge and geological & astronomical content of Compulsory Science for class 9, along with solution of hard numerical problems. We strongly believe that, viewers will be benefited from these videos. Feedbacks and suggestion to improve are always welcome and highly appreciated

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