(Important Questions) Important Question For CBSE Class X Science Board Examination 2009-10 (Set -9)

Q. 51. What is the value of solar constant?

Q. 52. Name the moons of Mars.

Q. 53. Name the moons of Neptune.

Q. 54. With respect to Pluto what is Binary system?

Q. 55. What is the tail of a comet made up of?

Q. 56. After what height do booster rockets burn due to friction?

Q. 57. In which orbits are remote sensing satellites launched?

Q. 58. From where was the first EDUSAT launched in India?

Q. 59. Which satellite to be launched by India will be useful for DTH service?

Q. 60. Give an example of physical equilibrium.

Q. 61. What kind of reaction should take place for attaining chemical equilibrium?

Q. 62. Draw the graph of rate of reaction à time.

Q. 63. How does temperature affect rate of reaction?

Q. 64. What is the concentration of H+ ion in pure water?

Q. 65. What is the pH value of Lemon Juice?

Q. 66. Give the chemical formula of ammonical brine.

Q. 67. Give chemical formula of soda ash.

Q. 68. What is efflorescence?

Q. 69. What is dead burnt plaster?

Q. 70. What is lime-light?

Q. 71. What happens when lime is heated with carbon in an electric furnace?

Q. 72. Name the major constituents of cement?

Q. 73. Give the chemical formula of glass.

Q. 74. What is added to make green coloured glass?

Q. 75. Write the full form of RCC.

Q. 76. Give the names and chemical formulae of ores of silver.

Q. 77. Give an equation for thermite process.

Q. 78. What is added to alumina to bring down its melting point in Hall- Heroult process?

Q. 79. Define emf series.

Q. 80. Which metals do not react with water at all?

Q. 81. Give the equation for formation of rust.

Q. 82. How is galvanized iron made?

Q. 83. Which alloy is used to make light instruments?

Q. 84. Which metals are refined by liquification process?

Q. 85. What is slag?

Q. 86. What product is obtained when phosphorus pentoxide dissolves in water?

Q. 87. Give the equation for steam reforming process.

Q. 88. What catalyst is used in Haber’s process?

Q. 89. Which base is used to make para-aminobenzoic acid?

Q. 90. What is the melting point of sulphur?

Q. 91. Give the chemical formula of copper pyrite.

Q. 92. At what temperature is rhombic sulphur obtained?

Q. 93. What is used as a preservative in jams and squashes?

Q. 94. What is used as a catalyst in the contact chamber to convert sulphur dioxide to trioxide?

Q. 95. Give an example showing dehydrating action of sulphuric acid.

Q. 96. give the chemical name and formula or oleum.

Q. 97. Give the chemical formula and IUPAC name for propyl alcohol.

Q. 98. Which enzyme converts sugar to glucose?

Q. 99. Ethyl alcohol undergoes oxidation in presence of acetic acid and chromium oxide to give?

Q. 100. Why is ethyl alcohol used in radiators of vehicles in cold countries?