CBSE Guess > Papers > Important Questions > Class X > Science > Science By Mr. Dushyant Jasar

Science

1.Write the chemical name and formula of baking soda? [1]

2.How does light bend while travelling from denser medium to rarer medium [1]

3. What is the use of reflector in solar cooker? [1]

4. Name the gas which is neither acidic nor basic in nature [1].

5. Name the process by which sulphuric acid is prepared? [1]

6. Name the mode of nutribon in fungi [1]

7.Gastric juice is produced in ----------------- [1]

8.Covering of lungs is called ------------------ [1]

9. Write the harmful effects of ozone depletion. ? [1]

10. Name the component of sunlight that mainly carries heat with it? [1]

11. What type of mirror is used to obtain a real image? [1]

12. What is the principle on which a d-c generator works? [1]

13. Why is sodium kept immersed in kerosene oil? [1]

14. What is potable water? [1]

15. what is the function of xylem? [1]

16. expand aids? [1]

17. what is ph ?

18. Combinations of colours red+blue -------- ---------------

19. Why are capillaries thin walled?

20. What is reproduction?

21. State one of the evolutionary forces leading to origin of a new species according to the synthetic theory of evolution?

22. Which gas is evolved during the process of fermentation?

23. What is corona?

24. Define hetrotrophic mode of nutrition?

25. Name the pigment, which can absorb solar enegry?

26. Name the two kinds of cells of xylem?

27. List the component of blood?

28. Name the largest artery in our body?

29. What is phytohormone?

30. What is the function of hormone throxin?

31. Define fertilisation?

32. Find the focal length of a convex mirror whose radius of curvature is 32 cm?

33. Find the power of concave lens of focal length 2 m.?

34. A lens used as a simple magnifier gives magnification of 6 what is its focal length?

35. How much current will an electric heater draw from a 220 volt line if the resistance of the heater is 50 ohms?

36. Calculate the total enegry given out by the fusion of 40 kg of u ²³⁵ assume 0.1 % of mass was converted into the enegry?

37. Calculate the speed of light in glass given that speed of light in vacum is 3.0 * 10 8 m/s andµ g=1.5?

38. Calculate the distance between earth and sun given that speed of light is 3.0 *10 8 m And sun ray take 500 sec to reach the earth surface?

39. How many gm of pure gold is in 20 gm of 22 carats gold?

40. When does a meteoroid become a meteor?

41. How many carats is pure gold?

42. Calculate the speed of light in glass given that speed of light in vacum is 3.0 * 10 8 m/s And µ g=1.5?

43. State the full form of

1. Ongc
2. Oil?

44. Write the functional group of alchols?

45. Define heridity?

46. Complete the following reaction?²³⁵ u ₉₂+ ⁰N₁------------------ ______+_____+3¹N₀+ Q

47. What type of mirror is used to obtain a real image?

48. Name on non metal which conduct electricity?

49. What do you mean by vulcanization of rubber?

50. Draw the symbol of wire crossing?

51. Define eutrophication?

52. State ohm’s law?

53. What will happen to the current in the if the resistance is doubled?

54. Why is sodium kept imersed in kerosene?

55. Name the alloy of aluminium, which is used for making air craft bodies?

56. What is fermentation?

57. Write the functional group of alchols?

58. What are photochemical reactions? Give example?

59. What is the effect of temperature on rate of most of the reaction?

60. What are enzymes?

61. Define ph?

62. What is meant by catalyst?

63. What are endothermic reaction give examples?

64. What is rust? Write its formula?

65. Write the formula of cisplatin?

66. Define ph?

67. Why is gypsum added to cement?

68. The magnification of mirror is +1what kind of mirror is it?

69. Explain the term focal length?

70. Write lens formula?

71. Write one use of convex lens?

72. Name the mode of nutrition in amoeba?

73. What is phagocytosis?

74. Name the respiratory organ in grasshopper?

75. Light is a form of ________and travels in a_________

76. Virtual image is always ____________

77. The bodies which emit light of their own are called__________bodies

78. Concave lens forms only ____________image

79. What is the relation between focal length and radius of curvature

80. Write the len’s formula?

81. Define pole?

82. What type of wave is light?

83. Define power of lens?

84. Give two uses of conacave mirror?

85. Define molarity. [1]

86. Name one effloroscence compound? [1]

87. What is the use of voltameter? [1]

88. What colour of wire is used for earthing? [1]

89. Write full form of cng? [1]

90. Write the full form of lpg? [1]

91. What is α particle? [1]

92. Define geotropism?[1]

93. State the function of xylem? [1]

94. Expand adp? [1]

95. Write the chemical name and formula of baking soda? [1]

96. How does light bend while travelling from denser medium to rarer medium [1]

97. What is the use of reflector in solar cooker? [1]

98. Name the gas which is neither acidic nor basic in nature [1].

99. Name the process by which sulphuric acid is prepared? [1]

100. Name any two artificial satellite launched by india.