In this post I provided some more

**Bihar polytechnic previous year question**which is very helpful for you.To practice on these questions you can improve the preparation of your exam.**Physics**

1. Frequency of a sound wave is 1000Hz and wavelength is 34cm .How much time will it take to travel 1km?

Explanation : no.

2. What is the effective voltage if two bulbs of 60W and 40W are connected in parallel sequence?

Explanation : no.

3. Three resistance of 2 ohm are arranged on a triangle,What is the resistance between any two top?

Explanation : no.

4. Total internal reflection of light is possible when light passes through

Explanation : no.

5. A convex lens which focus distance is 5cm.Its power is-

Explanation : no.

6. Which of the following is related to Fleming's left hand rule?

Explanation : no.

7. Milky way is discovered by

Explanation : no.

8. Which mirror always forms virtual image?

Explanation : no.

9. If 360 Coulomb's charge flows till 2 minutes then what will value of electric current?

Explanation : Use the formula Q=It.

10. Resistance of any wire does not depend upon

Explanation : no.

11. Rocket works on the principal of

Explanation : no.

12. A wire of resistance 36 ohm is cut into 'n' uniform parts and connect into parallel order,now effective resistance is 1 value of 'n' is-

Explanation : no.

13. How many numbers of electrons in 1 Coulomb charge?

Explanation : no.

14. Which mirror is used in side mirror of vehicles?

Explanation : no.

15. What is the full form of LASER?

Explanation : no.

16. A bullet of mass 20g is fired with a velocity of 400m/s from a gun of mass 8kg.What is the rocoil velocity of gun?

Explanation : no.

17. What is the relations between momentum and force?

Explanation : no.

18. What will value of current when voltmeter is connected in series order?

Explanation : Resistance of voltmeter is very high, therefore if we connect voltmeter in series order then value of current is zero.

19. Which of the following wavelength will be least?

Explanation : no.

20. Temperature of two material is 327°C and 127°C.What is the ratio in rate of thermal radiation which is radiated from that material?

Explanation : no.

21. 1HP is equal to-

Explanation :no.

22. Light year is the unit of-

Explanation : 1 light year=9.461×10¹⁵meters.

23. Which of the following quantities is scaler quantity?

Explanation : no.

24. When a moving bus stops suddenly the passengers are pushed-

Explanation : no.

25. Rainbow is formed due to

Explanation : no.

26. Minimum possible temperature is

Explanation : no.

27. What are the major carriers in n type semiconductor?

Explanation : no.

28. What is the value of 97°F in Kelvin?

Explanation : no.

29. If a glass prism is immersed into water then its dispersive power will

Explanation : no.

30. What is the value of gravitational acceleration on the height of 12800KM from the surface of earth?

Explanation : no.

**Chemistry**

31. Vinegar is the dilute solution of-

Explanation : no.

32. Baeyer's reagent is-

Explanation : no.

33. What is the monomer of natural rubber?

Explanation : no.

34. Which of the isoelectronic of C atom?

Explanation : no.

35. What will be normality of 4% NaOH solution?

Explanation : Molecular weight of NaOH is 40.

36. Which of the following element is least reactive?

Explanation : no.

37. Limonite is the ore of

Explanation : no.

38. Which of the following oxide reacts with dilute acids and gives H₂O₂?

Explanation : no.

39. What will be numbers of water molecules in 0.12g H₂O?

Explanation : no.

40. What is the percentage of nitrogen in atmosphere?

Explanation : no.

41. Which is made plaster of Paris after heating?

Explanation : 2(CaSO₄.2H₂O)⇒2CaSO₄.H₂O+3H₂O.

42. Which acid is called king of acids?

Explanation : no.

43. Which of the following is more reactive halogen?

Explanation : no.

44. What is the functional group of carboxylic acid?

Explanation : no.

45. Which of the following is redox reaction?

Explanation : no.

46. What is the general formula of alkene?

Explanation : no.

47. Which of the following is good conductor of electricity?

Explanation : no.

48. What is the chemical name of heavy water?

Explanation : no.

49. Solder is alloy of-

Explanation : no.

50. Concentration of sulphide ore is done by

Explanation : no.

51. What is the formula of blue vitriol?

Explanation : no.

52. Catalyst which is used in hydrogenation of oil is-

Explanation : no.

53. What is the number of Î± and Î² particles which is emitted in nuclear reaction ₉₀Th²³⁸⇒₈₃Bi²¹²

Explanation : no.

54. What is formed after heating the mixture of sodium acetate and sodalime?

Explanation : no.

55. Hydrogen bomb is based on the principle of

Explanation : no.

56. Which gas is formed when water reacts with calcium carbide?

Explanation : no.

57. Which non-matel is in liquid form at room temperature?

Explanation : no.

58. Which of the following is detergent?

Explanation : no.

59. What is the percentage of nitrogen in urea?

Explanation : Formula of urea is NH₂CONH₂.

60. What is the ratio of molecules which is present in 10g H₂O and 5g CO₂?

Explanation : no.

**Mathematics**

61. In a parallelogram ABCD,If AB=2x+5,CD=y+1,AD=y+5 and BC=3x-4,then ratio of AB:BC is-

Explanation : no.

62. What is mode of 9,10,6,9,6,7,9,9,10,8,10?

Explanation : no.

63. What is the volume of a cylinder which height is 6.5cm and full surface area is 220cm²?

Explanation : no

64. P(4,6) divided a line which is connecting A(-2,3) and B(6,7) in ratio of-

Explanation : no.

65. What is the probability of having at least one boy in a family of three children?

Explanation : no.

66. Which of the following is a factor of (a²-b²)(c²-f²)-4abcd?

Explanation : no.

67. The average temperature of Tuesday, Wednesday and Thursday was 42°C.The average temperature of Wednesday, Thursday and Friday was 47°C.If Tuesday's temperature was 33°C,then what was Friday's temperature?

Explanation : no.

68. A mixture of 40 liters of milk and water contains 10% water.How much water should be added so that the water is 20% in the new mixture?

Explanation : no.

69. If x=rsinÎ±cosÎ²,y=rsinÎ±sinÎ² and z=rcosÎ±,then the value of (x²+y²) is-

Explanation : no.

70. Radius of the wheels of a bicycle is 14cm.How much distance will travel by bicycle when wheels complete 50 revolution?

Explanation : no.

71. sin(60°+Î¸)-cos(30°+Î¸)=

Explanation : no.

72. Area of a square is equal to area of a rectangle.If length of rectangle is 16m and width is 9m,then what will be perimeter of square?

Explanation : no.

73. What is the greatest number of four digit which is divisible by 4,5,6,7 and 9?

Explanation : no.

74. If (2x-y)²+(3y-z)²=0,then x:y:z is-

Explanation : no.

75. 2Ë£⁺⁶=8Ë£⁺¹,then what will be value of x?

Explanation : no.

76. Sohan sold a watch at a lose of 5%.If he had sold that watch for rs.27 more,he would have gained 7%.Find the cost price of watch?

Explanation : no.

77. What is time taken by 110m long train to cross a 70m long platform with a speed of 36km/h?

Explanation : no.

78. [(secA+tanA)(1-sinA)]=

Explanation : no.

79. If each side of a square is increased by 10% then find the percentage increasement in the area?

Explanation : no.

80. Which of the following quadratic equation which sum of roots is -2 and product is -4?

Explanation : no.

81. A number is increased by 10% and then decreased by 10%,then the number decreased by

Explanation : no.

82. If sum of two positive numbers is 25 and product is 144,then difference of that numbers is

Explanation : no.

83. log₂a=4-log₂4,then the value of a is

Explanation : no.

84. If a side of a cubic tank is 23cm,then volume is

Explanation : no.

85. Two points (-3,2) and (-4,-3) are at the same distance from (-1,y).The value of y is

Explanation : no.

86. Before five years the age of A is three times of age of B and after ten years age of A is two times of age of B.What is the present age of A and B?

Explanation : no.

87. Length of a rectangle is x, width is y and perimeter is p.If x=2y then which of the following statement is correct?

Explanation : no.

88. Which of the following is factor of 27x³-64?

Explanation : Use the formula a³-b³=(a-b)(a²+ab+b²).

89. If m+n=4,mn=2 then what will be value of m²+n²?

Explanation : Use the formula a²+b²=(a+b)²-2ab.

90. tan315°sec900°+cot(-495°)×cosec(-450°) is equal to

Explanation : no.

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