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Important Physics Questions For SSC Exams

Why is rainbow seen after rain? After a rainfall, the clouds break and lie hanging in the sky and the sun is also visible. The Sun’s rays, falling on the water drops, are dispersed, totally reflected at the back of the drops and then again refracted into the eye of the observer with his back towards the sun. These dispersed rays which have suffered deviation give rise to a concentrated beam of light indicating all the colours of light. Ice wrapped in a blanket or packed with saw dust does not melt away quickly. Why? Ice wrapped in blanket does not melt, because blanket being bad conductor, cut off heat rays. Saw dust is also a bad conductor of heat. It protects the ice from the external heat and prevents it from melting away. Petrol fire cannot be put with water. Why? Petrol has less density than water. So when water is poured the petrol floats on it and keeps on burning.The temperature of the burning petrol is so high than the water and it would be evapora...

Chapter 1 - Solar System And Earth- A Brief Insight

“Father of Geography” – Eratosthenese   (Ist to measure earth circumfrence) “Systematic Geography” – Alexander Von Humbolt “Regional Geography” – Karl Ritter Origin & Evolution of Earth Ist Argument – Immanuel Kant (Germany) “Nebular Hypothesis” & “Binary Theories” – Laplace (1796) Modern Theory “Father of Big Bang Theory” - Georges Lemaitre (Belgium), Propounded by Edwin Hubble (1920) “Steady State Theory” - Hoyle  The solar system consists of the Sun and 8 planets revolving around it in different orbits. The statistics of the sun and the planets are given below: SUN •Age : About 5 Billion years •Distance : 149.8 Million Kms •Diameter : 1,38,400 Kms. •Photosphere temperature : 5,770 K •Core temperature : 150,000,000 K •Absolute visual magnitude : 4.75 •Rotation (as seen from the earth at the equator) : 25.38 days •Rotation (near the poles) : 33 days •The sun consists of 71% of Hydrogen, 26.5% Helium...