CBSE Guess > Papers > Important Questions > Class X > 2009 > Science > Science By Mr. Siddhartha Dixit

CBSE CLASS X

Q. 1. Describe the method of finding out the exact north-south direction at a place using the direction of sunlight.

Q. 2. Define the terms Astronomical unit, light years. Give approximate value of each in SI units.

Q. 3. Describe briefly the BIG-Bang theory of origin of universe.

Q. 4. What is Photosphere? Why is it that we can see the solar corona only at the time of the total solar eclipse?

Q. 5. What was the source of heat for the earth in its early stages? How did it help in the formation of various layers inside the earth?

Q. 6. List the conditions that make earth favorable place for survival of life.

Q. 7. State the composition of the main layers of earth center outwards.

Q. 8. How do we obtain information about the interior of earth?

Q. 9. Explain why the number of meteorites striking the moon’s surface is quite large where as very few reach the earth’s surface.

Q. 10. Differentiate between Meteors and meteorites.

Q. 11. How is the pole star located in the sky? Why is the pole star so special? How does it give direction more accurately?

Q. 12. The mass of a star P is 300 times that of star Q. if the mass of Q is nearly equal to that of the sun. Which one would end up as Supernova? What is the source of light for the White dwarf stars?

Q. 13. What keeps planets and satellites moving around the sun? What is the cause for the rise of Hydrogen filled balloon in air?

Q. 14. Name the common characteristics of the Jovian and Terrestrial planets?

Q. 15. What is the Red spot seen on the surface of Jupiter believed to be?

Q. 16. Why should asteroids be watched carefully?

Paper By Mr. Siddhartha Dixit