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Solar System, Planets, Moons, Asteroid Belt,Kuiper Belt and Oort Cloud, Comets and Meteoroids

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 The solar system consists of the Sun, which is a star at its center, and all the celestial bodies bound by its gravitational pull. These bodies include planets, moons, asteroids, comets, and other objects. Key Components of the Solar System: The Sun : The Sun is the center of the solar system and contains about 99.86% of its mass. It is a star primarily composed of hydrogen and helium, providing the heat and light that sustains life on Earth. Planets : There are eight recognized planets in the solar system: Mercury : The closest planet to the Sun, known for extreme temperature variations and no atmosphere. Venus : Similar in size to Earth but with a thick, toxic atmosphere and surface temperatures hot enough to melt lead. Earth : The third planet from the Sun, the only known planet to support life, with water and a breathable atmosphere. Mars : Known as the Red Planet, it has a cold, dry surface and signs of past water. Jupiter : The largest planet, a gas giant, w...
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Important Multiple Choice Questions of physics || Class 11 ||

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1. A particle moves along a straight-line y= 3x + 5. Which coordinate changes at faster rate? a) X- coordinate  b) y-coordinate  c) both x and y  d) insufficient data Ans: b) y-coordinate ( Let suppose x=1,then y=8 ,x= 2 ,y = 11. So y coordinate is increasing 3 times faster as compare to X- coordinate  ) .  2. If š“āƒ— + šµāƒ—āƒ— = š¶āƒ— and A+B = C then the angle between š“āƒ— and šµāƒ—āƒ— is- a) 0 b) Ļ€/4  c) Ļ€/2  d) Ļ€  Ans: c) Ļ€/2 3. If a unit vector is represented by 0.5š‘–āˆ’ 0.8š‘—+ c k then the value of ā€˜cā€™ is- a) 1  b) āˆš0.11  c) āˆš0.01 d) āˆš0.39 Ans: b) āˆš0.11 4. Given that A = B. what is the angle between (š“āƒ— + šµāƒ—āƒ—) and (š“āƒ— āˆ’ šµāƒ—āƒ—āƒ—āƒ—āƒ—āƒ—āƒ—āƒ—) =? a) 30Ā° b) 60Ā° c) 90Ā° d) 180Ā° Ans: d) 180Ā° 5. What is the component of the (3i+4j) along (i + j)? a) Ā½ (i + j)  b) 3/2(i + j)  c) 5/2 (i + j)  d) 7/2 (i + j) Ans: d) 7/2 (i + j) 6. What is the value of (š“āƒ— + šµāƒ—āƒ—).( š“āƒ— Ɨ šµāƒ—āƒ—)? a) 0  b) AĀ²-BĀ² c) AĀ²+BĀ²+2AB  d) None of these Ans...
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KVS CBSE Worksheets CHAPTER 1 Electric Charges and Fields Class 12

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                      SECTION A CONCEPTUAL AND APPLICATION TYPE QUESTIONS  1 Is the force acting between two point charges q1 and q2 kept at some distance apart in air attractive or repulsive when i) q1 q2 > 0 ii) q1 q2 < 0 ? 1 (2007)  2 If the distance between two equal point charges is doubled and their individual charges are also doubled ,what would happen to the force between them ? 1(2014)  3 Do the electrostatic field lines form closed loops? 1(2014)  4 A hollow metal sphere of radius 5cm is charged such that the potential on its is 10V. What is the electric field at the center of the sphere? 1(2011)  5 What is meant by the statement that   ā€œthe electric field of a point charge has spherical symmetry whereas electric field due to an electric dipole is cylindrically symmetricalā€™ā€™ ? 1(1996)  6 Why is it difficult to perform electrostatic experiments on a humid day? 1  7 The ...
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Distinction between Electromagnetic Waves and Matter Waves

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  Difference   between Electromagnetic Waves and Matter Waves Ā» Electromagnetic waves 1. Electromagnetic waves are associated with electric and magnetic fields perpendicular to each other and to the direction of propagation of radiation. 2. Electromagnetic waves can be radiated into space or emitted. 3. They do not require any medium for propagation i.e., these waves can pass through vacuum. 4. All electromagnetic waves travel with the same velocity.  5. The velocity of all electromagnetic waves is equal to that of light (3 x 108 m/s). 6. The wavelengths of electromagnetic radiation are much large .   Ā» Matter waves 1. Matter waves may not be associated with electric and magnetic fields. 2. Matter waves are neither radiated into space nor emitted by the particles. These are simply associated with the particles 3. They require medium for propagation i.e., these waves cannot pass through vacuum. 4. Matter waves travel with different vel...
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Khelo India Program || Physical education Chapter 1 Class 11 || Changing trends and career in physical education ||

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                        Introduction The importance of sports and fitness in oneā€™s life is invaluable. Playing sports inculcates team spirit, develops strategic and analytical thinking, leadership skills, goal setting and risk taking. Moto of Khelo India Program is ā€œA fit and healthy individual leads to an equally healthy society and strong nationā€.  Sports is an extremely important component for the overall development of our nation or for any nation. India, in the last five years has made steady progress in the field of sports. This tremendous potential need to be show cased at a global platform. Itā€™s time we inspire young talent, give them top notch, infrastructure and training of the highest level. We need to inculcate a strong spirit of participation in the sports that enables players to demonstrate their true potential. Only then India can  realise its dream of becoming a sports super power.  The...
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