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  • 1 answers

Tiger$ Praful Jawale 4 years, 8 months ago

only chemistist can ans. it
  • 0 answers
  • 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

The shortage distance traveled by an object in straight line known as displacement. The path traveled by an object is known as distance.How so ever the time and how long it traveled doesn't matter
  • 3 answers

Aishwarya Satish 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

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.
  • 1 answers

Satyam Kumar 4 years, 8 months ago

a.cell wall It is made up of cellulose and gives turgidity,rigidity and strength to a plant
  • 2 answers

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>

Harshal Nagar 4 years, 8 months ago

science work and energy
  • 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.

  • 4 answers

Satyam Kumar 4 years, 8 months ago

a.Ca3(PO4)2 b. Mg(OH)3 c. AlCl3

Surbhi Anand 4 years, 8 months ago

AlCl3

Abhay Pratap Singh 4 years, 8 months ago

Hi

Gajendra Singh 4 years, 8 months ago

Mg(oh)3,
  • 2 answers

Deepender Sheoran 4 years, 8 months ago

Momentum is zero momentum is that product of mass and velocity of a particular material and when ball is thrown vertically upwards its velocity at highest point is zero P=m.v=m.0=0

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.

  • 3 answers

Khushi Choudhary 4 years, 8 months ago

Thanks

Archit Kumar 4 years, 8 months ago

Isotopes: Atoms having same atomic number but different masses is known as Isotopes

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.

  • 0 answers
  • 4 answers

Aishwarya Satish 4 years, 8 months ago

Movement of objects

Garima Bhadauriya 4 years, 8 months ago

Movement in any object from one point to another is known as motion

Bharat Sharma 4 years, 8 months ago

Motion, in physics, change with time of the position or orientation of a body. ... Motion that changes the orientation of a body is called rotation. In both cases all points in the body have the same velocity (directed speed) and the same acceleration (time rate of change of velocity).

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.

  • 2 answers

Khushi Choudhary 4 years, 8 months ago

In 1911 Rutherford made

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.

  • 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.
  • 1 answers

Neha Barthwal 4 years, 8 months ago

Octet means presence of a total of 8 electrons in its valence shell while in case of duplet only 2 electrons are present in valence shell.
  • 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.

  • 3 answers

Hasina Mandar 4 years, 8 months ago

Nucleus

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.

  • 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.

  • 3 answers

Neha Barthwal 4 years, 8 months ago

Thank you friends.. ❤❤

Surbhi Anand 4 years, 8 months ago

Work done=Force* Displacement=Weight*Displacement=mgs =(10*9.8*2)J =196J

Neshok Neshok 4 years, 8 months ago

A weight lifter grabs a 100 kg dumbbell that's sitting on the floor and lifts it 2.0 meters to a point over her head. Then she holds the dumbbell over her head, motionless, for several seconds. a) How much work did she do on the dumbbell while lifting it? Show your reasoning. b) How much work did she do on the dumbbell while holding it over her head? Explain. c) The weightlifter says, "Don't even try to tell me I'm not doing work while holding the dumbbell over my head. I'm working hard - look at me sweat, and look how tired I get! " Reconcile your part b answer with the weightlifter's feeling that she's doing work on the dumbbell while holding it motionless. In other words, explain how it's the case that the weightlifter gets tired even though she's not doing work on the dumbbell.
  • 5 answers

Ashna Gurjar 4 years, 7 months ago

Science Hamra knowledge badhane ke liye hai hame science new new ?thing create large ke liye hai neshok neshok wala jo bhi hai us se karma chahti hu stupid question nahi hai stupid tum ho

Ashna Gurjar 4 years, 7 months ago

Nahi aata answer to stupid question

Zaid . 4 years, 8 months ago

??

Bharat Sharma 4 years, 8 months ago

Pdne k liye

Neshok Neshok 4 years, 8 months ago

Stupid question
  • 5 answers

Keshri Garg 4 years, 8 months ago

Puchon pawan

Neshok Neshok 4 years, 8 months ago

isothermic(Adjective) Of equal or constant temperature with respect to space, volume, or pressure

Ashna Gurjar 4 years, 6 months ago

1 question ka answer bataega koi mujhe??

Ashna Gurjar 4 years, 8 months ago

Anyone talling me

Deepali Patel 4 years, 7 months ago

Chemistry
  • 2 answers

Riya Singh 4 years, 8 months ago

Because of less or high density. .........when density is high from water it will sink ........ when density is less then water then it floats......

Aniket Duhan 4 years, 8 months ago

Because there dencte is less or high
  • 3 answers

Somansh Sarvesh 4 years, 8 months ago

Viruses cannot be treated by antibiotics as viruses do not have a cell wall. Antibiotics can kill a bacteruim as the antibiotics damages the cell wall of the bacterium. If there would be no cell wall, so the bacterium will automatically die. So for virus, antibiotics are of no use as viruses don'thave any cell wall. For viruses, we take anti-viral drugs.

Riya Singh 4 years, 8 months ago

Thank you so much

Divyanshi Sharma 4 years, 8 months ago

Because they are dead when they are outside our body..and when they are inside our body they take our nutrition and lives in our body and harm us
  • 2 answers

Ashna Gurjar 4 years, 8 months ago

Oooooo????

Gaurav Seth 4 years, 8 months ago

CBSE Class 9 Science (086) - Deleted portion (Theory):

Unit I: Matter-Nature and Behaviour

           Chapter

Topics

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.

Unit II: Organization in the Living World

           Chapter

Topics

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).

Unit III: Motion, Force and Work

           Chapter

Topics

Floatation

Thrust and Pressure. Archimedes’ Principle; Buoyancy; Elementary idea of Relative Density.

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).

Unit V: Food Production

           Chapter

Topics

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.


 

  • 3 answers

Aishwarya Satish 4 years, 8 months ago

Session...

Riya Singh 4 years, 8 months ago

Yupppp

Deep Gopal 4 years, 8 months ago

yees

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