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Yogita Ingle 3 years, 10 months ago
There are 366 days in a leap year. A year usually has 365 days. The extra day is needed to keep the calendar "in synch" with the Earth's orbit around the Sun. The Earth takes about 365 and a quarter days to orbit the Sun once. The extra 6hours is not included in each year. Thus leap year comes once in every four years including an extra day(24 hours) that is 29th February including the extra 6hours from each 4 revolution time periods.
Posted by Rashid Khan 3 years, 10 months ago
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Aishveer Brar 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
In this process, the soil particles are loosened or washed away in the valleys, oceans, rivers, streams or far away lands. This has been worsening due to human activities such as agriculture and deforestation.
Soil erosion is a continuous process that occurs either slowly or at an alarming rate. It results in a continuous loss of topsoil, ecological degradation, soil collapse, etc.
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Yogita Ingle 3 years, 10 months ago
Newton studied the ideas of Galileo and gave the three laws of motion. These laws are known as Newton’s Laws of Motion.
- Newton's First Law of Motion: Any object remains in the state of rest or in uniform motion along a straight line, until it is compelled to change the state by applying external force.
- Newton's Second Law of Motion: The rate of change of momentum is directly proportional to the force applied in the direction of force.
- Newton's Third Law of Motion: There is an equal and opposite reaction for evrey action
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Force: It is a push or pull on an object that produces acceleration in the body on which it acts. S.I. unit of force is Newton.
Newton’s I law of motion: An object remains in a state of rest or of uniform motion in a straight line unless acted upon by an external unbalanced force.
Newton’s II law of motion: The rate of change of momentum of an object is proportional to the applied unbalanced force in the direction of the-force.
Newton’s III law of motion: To every action, there is an equal and opposite reaction and they act on two different bodies.
Daksh Singh 3 years, 10 months ago
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Sukhman Ghuman 3 years, 10 months ago
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The concentration of a solution is the amount of solute present in a given amount (mass or volume) of solution, or the amount of solute dissolved in a given mass or volume of solvent. Two ways of expressing the concentration of a solution :
(i) Mass by mass percentage of a solution
= Mass of solute ÷ Mass of solution x 100
(i) Mass by volume percentage of solution
= Mass of solute ÷ Volume of solution x 100
Chaitanya Goravar 3 years, 10 months ago
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Sukhman Ghuman 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
| Element | Symbols | Electrons | Protons | Neutrons |
| Hydrogen | H | 1 | 1 | 0 |
| Deuterium | D | 1 | 1 | 1 |
| Tritium | T | 1 | 1 | 2 |
H, D and T are the three isotopes of hydrogen with same atomic number and different mass numbers of 1, 2 and 3 respectively.
Concept insight: Recall the mass numbers of each of the isotopes.
Posted by Ayushi Mehta 3 years, 10 months ago
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Gyan Prakash 3 years, 10 months ago
Yogita Ingle 3 years, 10 months ago
An ion can be defined as a chemical species which holds a positive or negative charge of some magnitude.
Several methods exist for the preparation of ions. For example, spontaneous collisions between the molecules of a liquid or gaseous fluid can result in one of the electrons being knocked off an atom/molecule. This results in the formation of a positively charged ion and a free electron. This type of ionization is commonly referred to as physical ionization. The free-electron may even go on to attach itself to another atom or molecule, resulting in the formation of a new negatively charged anion.
Another important process through which ions can be created is through chemical interactions. For example, when an ionic compound such as salt is dissolved in a suitable solvent (such as water), the atoms that constitute the salt undergo dissociation and form free ions. When common salt, also known as sodium chloride, is dissolved in water, it undergoes dissociation to yield sodium cations and chloride anions. It can be noted that the sodium cations are denoted by the symbol Na+ and the chloride anions are denoted by the symbol Cl–.
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| Sr.no | Kinetic Energy | Potential Energy |
| 1. | Kinetic energy is the kind of energy present in a body due to the property of its motion | Potential Energy is the type of energy present in a body due to the property of its state |
| 2. | It can be easily transferred from one body to another | It is not transferable |
| 3. | The determining factors for kinetic energy are Speed or velocity and mass | Here, the determining factors are Height/ distance and mass |
| 4. | Flowing water is one of the examples for kinetic energy | Water present at the top of a hill is an example of potential energy |
| 5. | It is relative with respect to nature | It is non-relative with respect to nature |
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It is basically an applied case of projectile motion. When a body is thrown, the force is applied tangentially to the curve of the earth but the motion of the object is in a parabolic form due to the action of gravity. The moon revolves around the earth in a similar way but due to the velocity with which the moon got hooked onto the earth’s gravity keeps it from falling onto the earth. This keeps the moon in a pretentious orbit around the earth even though it is moving further away from our planet by an ever so little margin.
Posted by Sazain Fayaz 3 years, 10 months ago
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Yogita Ingle 3 years, 10 months ago
Each orbit or shell has a fixed energy and these circular orbits are known as orbital shells.
The electrons in an atom move from lower energy level to higher energy level by gaining the required energy and an electron moves from higher energy level to lower energy level by losing energy.
Answer: d:both a and b
Posted by Sazain Fayaz 3 years, 10 months ago
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Tanisha Mittal 3 years, 10 months ago
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