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Ask QuestionPosted by Tiger$ Praful Jawale 4 years, 8 months ago
- 1 answers
Posted by Kiranvir Kaur 4 years, 8 months ago
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Posted by Aarti Raghuwanshi 4 years, 8 months ago
- 2 answers
Yogita Ingle 4 years, 8 months ago
| Distance | Displacement |
| The complete length of the path traveled by an object to go from one point to another is called distance | The shortest distance between two points is called displacement |
| Distance is a scalar quantity, which means it only has a magnitude | Displacement is a vector quantity which means it has magnitude and direction |
| Distance can only have positive values | Displacement can have both positive and negative values |
| Distance depends on the length of the path traveled | Displacement depends only on the initial and final point regardless of the path traveled |
Naved Akhtar 4 years, 8 months ago
Posted by Vivek Rana 4 years, 8 months ago
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Posted by Vivek Rana 4 years, 8 months ago
- 3 answers
Aishwarya Satish 4 years, 8 months ago
Yogita Ingle 4 years, 8 months ago
The primary function of striated muscles is to generate force and contract in order to support respiration, locomotion, and posture (skeletal muscle) and to pump blood throughout the body (cardiac muscle).
Gaurav Seth 4 years, 8 months ago
Skeletal(Striated) Muscle:
Structure: Skeletal muscle is called "striated" because of its appearance consisting of light and dark bands visible using a light microscope. A single skeletal muscle cell is long and approximately cylindrical in shape, with many nuclei located at the edges (periphery) of the cell.
Function:
- Movement of the skeleton under conscious control, including movement of limbs, fingers, toes, neck, etc.
- Movement of tissues of facial expression under conscious control, e.g. ability to smile and to frown.
Posted by Vivek Rana 4 years, 8 months ago
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Satyam Kumar 4 years, 8 months ago
Posted by Deepender Sheoran 4 years, 8 months ago
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Gaurav Seth 4 years, 8 months ago
HRD Minister Ramesh Nishank announced a major CBSE syllabus reduction for the new academic year 2020-21 on July 7 which was soon followed by an official notification by CBSE on the same.
Considering the loss of classroom teaching time due to the Covid-19 pandemic and lockdown, CBSE reduced the syllabus of classes 9 to 12 with the help of suggestions from NCERT.
Click on the given links for deleted syllabus:
- <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDComputer_Application_Sec_2020-21.pdf" target="_blank">Deleted - Computer Application</a>
- <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDEnglish_Sec_2020-21.pdf" target="_blank">Deleted - English - Language and Literature</a>
- <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHindi_A_Sec_2020-21.pdf" target="_blank">Deleted - Hindi A</a>
- <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHindi_B_Sec_2020-21.pdf" target="_blank">Deleted - Hindi B</a>
- <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDHome_Science_Sec_2020-21.pdf" target="_blank">Deleted - Home Science</a>
- <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDMathematics_Sec_2020-21.pdf" target="_blank">Deleted - Mathematics</a>
- <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDScience_Sec_2020-21.pdf" target="_blank">Deleted - Science</a>
- <a href="http://cbseacademic.nic.in/web_material/CurriculumMain21/revisedsyllabi/Deduction/DELETEDSocial_Science_Sec_2020-21.pdf" target="_blank">Deleted - Social Science</a>
Posted by Bhanu Sri 4 years, 8 months ago
- 2 answers
Gaurav Seth 4 years, 8 months ago
Crop protection is the general method or the practice of protecting the crop yields from different agents including pests, weeds, plant diseases, and other organisms that cause damage to the agricultural crops.
Apart from crops, agricultural fields would have weeds, small animals like rats, mites, insects, pests, disease-causing pathogens and frequently raided by birds. All these factors are mainly responsible for the loss or damage to the crops. Thus to yield high crop production, farmers need to protect the crop from these pests. Hence crop protection management is important before, during and after the cultivation.
Yogita Ingle 4 years, 8 months ago
Crop protection is the general method or the practice of protecting the crop yields from different agents including pests, weeds, plant diseases, and other organisms that cause damage to the agricultural crops.
Apart from crops, agricultural fields would have weeds, small animals like rats, mites, insects, pests, disease-causing pathogens and frequently raided by birds. All these factors are mainly responsible for the loss or damage to the crops. Thus to yield high crop production, farmers need to protect the crop from these pests. Hence crop protection management is important before, during and after the cultivation.
Posted by Sagar Ghanghas 4 years, 8 months ago
- 4 answers
Posted by Neshok Ls 4 years, 8 months ago
- 2 answers
Deepender Sheoran 4 years, 8 months ago
Gaurav Seth 4 years, 8 months ago
The momentum is zero.
Explanation:
momentum is the product of mass and velocity of a particular material . And when ball is thrown vertically upwards its velocity at highest point is zero . Therefore momentum P = m× v = m × 0 =0.
Posted by Shiv Kumar 4 years, 8 months ago
- 3 answers
Archit Kumar 4 years, 8 months ago
Gaurav Seth 4 years, 8 months ago
Isotopes: Isotopes are atoms with the same number of protons but that have a different number of neutrons. Since the atomic number is equal to the number of protons and the atomic mass is the sum of protons and neutrons, isotopes are elements with the same atomic number but different mass numbers.
Isobars: Atoms of different elements with different atomic numbers, which have the same mass number, are known as isobars.
Posted by Naresh Singh 4 years, 8 months ago
- 0 answers
Posted by Naresh Singh 4 years, 8 months ago
- 4 answers
Garima Bhadauriya 4 years, 8 months ago
Bharat Sharma 4 years, 8 months ago
Yogita Ingle 4 years, 8 months ago
Movement of any object from one position to another position with respect to the observer is called as Motion.
Posted by Yash Aggarwal 4 years, 8 months ago
- 2 answers
Gaurav Seth 4 years, 8 months ago
In 1911 Rutherford made and experiment to study about the structure of atom. In this experiment the α-particles from 83Bi214 (a radioactive source) contained in a lead cavity are collinated into a narrow beam with the help of a lead plate having a narrow slit the narrow beam of α-particles then falls on a thin gold foil (about 2.1 x 10-10 m thick). The α-particles scattered in different directions.The whole apparatus was arranged inside a vaccum chamber toprevent the scattering of α-particles from air molecules. The experimental observations led Rutherford to the following conclusions-
(i) Since most of the α-particles passed undiviated, than atom has a lot of empty space in it.
(ii) Since the fast and the heavy α-particle could be deflected through even 180°, the whole of + ve charge and partcially the entire mass of the atom was confined to an extremely small central core.
It was called nucleus.
Since 1 in about 8000 α-particles in deflected through 180°, the size of the nucleus is about 1/10,000 th of the size of the atom.
(iii) The scattering of different α-particles through different angles on the nuclear model of the atom as below.
The α-particles such as a and a',which pass through the atom at a large distance from the nucleus experiences a small electrostatic force of repulsion due to the nucleus and hence undergo a very small deflection. The α-particles b and b1 which pass through the atom at a close distance from the nucleus suffer a large deflection.The α-particles such as C, which travels towards the nucleus directly, shows down as it moves and ultimately comes to rest and than after being deflected through 180°, retraces it path.
Posted by Shivang Shivang 4 years, 8 months ago
- 1 answers
Gaurav Seth 4 years, 8 months ago
| Communicable diseases |
| It can be transmitted from an infected person to a healthy person. |
| It is caused by pathogenic micro organisms. |
| Examples: Typhoid, cholera, etc. |
| Non communicable diseases |
| It cannot be transmitted from an infected person to a healthy person. |
| It is caused by the tissue degeneration, nutrition or hormone deficiency and tumor formation. |
| Examples: Diabetes, Cancer, etc. |
Posted by Hasina Mandar 4 years, 8 months ago
- 1 answers
Neha Barthwal 4 years, 8 months ago
Posted by Dasharatha Naik 4 years, 8 months ago
- 2 answers
Gaurav Seth 4 years, 8 months ago
2.
Let the mass of earth = M.
Let the mass of the object = m.
Distance between the the earth's centre and object = Radius of the earth = R.
Therefore,
Gravitational Force = F = GMm/ R 2
Gaurav Seth 4 years, 8 months ago
1. Newton's law of universal gravitation states that a particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
Posted by Neshok Ls 4 years, 8 months ago
- 3 answers
Yogita Ingle 4 years, 8 months ago
In a Plant cell, Plastids are the largest cell organelle.
Gaurav Seth 4 years, 8 months ago
Nucleus
Nucleus is the largest organelle. Nucleus is present in the eukaryotic cells.
Nucleus holds the genetic material. The shape of the nucleus is spherical.
Nucleus regulates all the activities of the cell. Therefore, it is called as the
Protoplasm
Plasma membrane
Cytoplasm
Nucleus
Cytoplasm is the cellular matrix, in this matrix the nucleus is suspended.
Posted by Rekha Hosmani 4 years, 8 months ago
- 1 answers
Yogita Ingle 4 years, 8 months ago
Phosphorus(Atomic no. 15) has its electrons arranged in a configuration of 2,8,5. Now, orbits are stable when they are full. In this case, The outer orbit must have eight electrons for stability in combining with other elements, also known as valency. So one can either add 3 electrons to the outer orbit or take away 5 electrons with equal ease. So Phosphorus has a valency of 3 or 5.
Posted by Neha Barthwal 4 years, 8 months ago
- 3 answers
Surbhi Anand 4 years, 8 months ago
Neshok Neshok 4 years, 8 months ago
Posted by Ashna Gurjar 4 years, 8 months ago
- 5 answers
Ashna Gurjar 4 years, 7 months ago
Posted by Deepali Patel 4 years, 8 months ago
- 5 answers
Neshok Neshok 4 years, 8 months ago
Posted by Ragini Kumari 4 years, 8 months ago
- 2 answers
Riya Singh 4 years, 8 months ago
Posted by Riya Singh 4 years, 8 months ago
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Somansh Sarvesh 4 years, 8 months ago
Divyanshi Sharma 4 years, 8 months ago
Posted by Vivek Rana 4 years, 8 months ago
- 2 answers
Gaurav Seth 4 years, 8 months ago
CBSE Class 9 Science (086) - Deleted portion (Theory):
|
Unit I: Matter-Nature and Behaviour |
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Chapter |
Topics |
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Matter in Our Surroundings |
Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation. |
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Unit II: Organization in the Living World |
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Chapter |
Topics |
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Diversity in Living Organisms |
Diversity of plants and animals-basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thallophyta, Bryophyta, Pteridophyta, Gymnosperms and Angiosperms). Major groups of animals (salient features) (Non-chordates upto phyla and chordates upto classes). |
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Unit III: Motion, Force and Work |
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Chapter |
Topics |
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Floatation |
Thrust and Pressure. Archimedes’ Principle; Buoyancy; Elementary idea of Relative Density. |
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Sound |
Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the Human Ear (Auditory aspect only). |
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Unit V: Food Production |
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Chapter |
Topics |
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Improvement in Food Resources |
Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming. |
Posted by Deep Gopal 4 years, 8 months ago
- 3 answers
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