(Important Questions) Important Question For CBSE Class X Science Board Examination 2009-10 (Set -8)

Q. 1. What is the diameter of a bucky ball?

Q. 2. Name the types of nanotubes.

Q. 3. What is the refractive index of water ?

Q. 4. Give the position and nature of image formed by a convex lens when the object is placed at F.

Q. 5. What is the SI unit of power of lens ?

Q. 6. What is the power of a concave lens having focal length 0.5m?

Q. 7. What is the velocity of light in vacuum?

Q. 8. Comment on the refractive index of any medium.

Q. 9. At what position will a concave mirror give a real, inverted image of same size as the object?

Q. 10. Which kind of lens has positive power?

Q. 11. Which colour is obtained at the top in a prism spectrum and why?

Q. 12. If white light is incident on a mixture of blue and yellow pigments, which colour is reflected?

Q. 13. Which technique is used to produce coloured pictures on T V?

Q. 14. Name the primary pigments.

Q. 15. Which lens is used to correct Hypermetropia?

Q. 16. In a telescope, which lens has a larger focal length?

Q. 17. If an electrical lamp lights for 2 hrs drawing a current of 0.4 A, calculate the amount of charge that passed through the lamp?

Q. 18. Define electric potential.

Q. 19.How much current will an electric heater connected to 220 V line draw if its resistance is 45 ohm?

Q. 20. How much energy is consumed in joules if the domestic meter reading shows 15.5 units?

Q. 21. Out of tap water, sea water and pure water, which is the best conductor of electricity?

Q. 22. What type of V-> I graph does ohm’s law suggest?

Q. 23. Why does a solenoid produce a strong magnetic field?

Q. 24. What is the frequency of domestic current?

Q. 25. Which electromagnetic rays have wave length less than ultraviolet rays?

Q. 26. What keeps the water circulating in the tank of a solar water heater?

Q. 27. What temperature is attained at the Mount Louis in France by Solar furnace?

Q. 28. How much electricity is produced by a single solar cell?

Q. 29. Which are the necessary structural parameters of a windmill?

Q. 30. At what depth is OTEC captured?

Q. 31. Where on Earth can OTEC be captured?

Q. 32. Define Magma.

Q. 33. What is the average temperature obtained in hot water geysers?

Q. 34. Where is hydrogen used as a fuel?

Q. 35. How many carbon atoms are present in a molecule of diesel?

Q. 36. What is the calorific value of kerosene?

Q. 37. At what temperature is Lubricating oil obtained in the FD tower?

Q. 38. What is the specific heat of water?

Q. 39. 1 eV is how many joules?

Q. 40. 1 u is how many eV?

Q. 41. What is the atomic mass of a neutron?

Q. 42. How much energy does fission of 1kg uranium produce?

Q. 43. Define spontaneous fission.

Q. 44. What is the energy of neutron released during nuclear fission?

Q. 45. How much is the energy of a neutron decreased to obtain a thermal neutron?

Q. 46. Mass defect is converted to energy as per which equation?

Q. 47. At what temperature is plasma state obtained?

Q. 48. Define Ignition temperature.

Q. 49. When and where did the most serious nuclear accident take place?

Q. 50. What is the value of solar mass?