Bihar polytechnic previous year question (Set 2)

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.

                       

Bihar polytechnic previous year question (Set 2)

                               Physics
 

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

A) 5.84 sec
B) 2.94 sec
C) 2.1 sec
D) 4.1 sec

... Answer is B)
Explanation : no.

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

A) 24W
B) 100W
C) 20W
D) 60W

... Answer is A)
Explanation : no.

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

A) 3/4 ohm
B) 4/3 ohmm
C) 4 ohm
D) 3 ohm

... Answer is B)
Explanation : no.

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

A) Air to glass
B) glass to water
C) Air to water
D) Water to air

... Answer is D)
Explanation : no.

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

A) +20D
B) -20D
C) +50D
D) -50D

... Answer is A)
Explanation : no.

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

A) Force
B) Current
C) Resistance
D) Magnetic field

... Answer is C)
Explanation : no.

7. Milky way is discovered by

A) Galileo
B) Copernicus
C) Kepler
D) Harschel

... Answer is A)
Explanation : no.

8. Which mirror always forms virtual image?

A) Concave
B) Convex
C) Plane
D) Convex and Plane both

... Answer is D)
Explanation : no.

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

A) 720A
B) 180A
C) 3A
D) 360A

... Answer is C)
Explanation : Use the formula Q=It.

10. Resistance of any wire does not depend upon

A) Temperature
B) Length of wire
C) Cross section area of wire
D) Humidity

... Answer is D)
Explanation : no.

11. Rocket works on the principal of

A) Conservation of mass
B) Conservation of momentum
C) Conservation of energy
D) Conservation of speed

... Answer is B)
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-

A) 3
B) 5
C) 6
D) 12

... Answer is C)
Explanation : no.

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

A) 6.25×10¹⁶e
B) 6.25×10¹⁷e
C) 6.25×10¹⁸e
D) 6.25×10¹⁹e

... Answer is D)
Explanation : no.

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

A) Convex
B) Concave
C) Plane
D) All of above

... Answer is A)
Explanation : no.

15. What is the full form of LASER?

A) Light amplification by spontaneous emission of radiation
B) Light amplification by stimulated emission of radiation
C) Light absorption by stimulated emission of radiation
D) Light absorption by spontaneous emission of radiation

... Answer is B)
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?

A) 1m/s
B) -1m/s
C) 2m/s
D) -2m/s

... Answer is B)
Explanation : no.

17. What is the relations between momentum and force?

A) F=mv-mu
B) F=ma
C) F×t=m×a
D) F×t=mv-mu

... Answer is D)
Explanation : no.

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

A) Maximum
B) Minimum
C) Zero
D) Constant

... Answer is C)
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?

A) X-ray
B) Ultrasonic wave
C) Light wave
D) Magnetic wave

... Answer is B)
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?

A) 81:16
B) 16:81
C) 9:343
D) 5:25

... Answer is A)
Explanation : no.

21. 1HP is equal to-

A) 1000W
B) 100W
C) 746W
D) 647W

... Answer is C)
Explanation :no.

22. Light year is the unit of-

A) Time
B) Mass
C) Temperature
D) Distance

... Answer is D)
Explanation : 1 light year=9.461×10¹⁵meters.

23. Which of the following quantities is scaler quantity?

A) Velocity
B) Force
C) Momentum
D) All of above

... Answer is D)
Explanation : no.

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

A) Backward
B) Forward
C) Upward
D) Downward

... Answer is B)
Explanation : no.

25. Rainbow is formed due to

A) Dispersion of light
B) Reflection of light
C) Refraction of light
D) None of these

... Answer is A)
Explanation : no.

26. Minimum possible temperature is

A) 0°C
B) -300°C
C) -273°C
D) -273°C

... Answer is D)
Explanation : no.

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

A) Holes
B) Electrons
C) Protons
D) Photons

... Answer is B)
Explanation : no.

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

A) 0K
B) 300K
C) 309.1K
D) 301.9K

... Answer is C)
Explanation : no.

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

A) Increase
B) Decrease
C) Do not change
D) None of these

... Answer is B)
Explanation : no.

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

A) 1.09m/s²
B) 5.09m/s²
C) 9.8m/s²
D) 4.7m/s²

... Answer is A)
Explanation : no.

                           Chemistry

31. Vinegar is the dilute solution of-

A) Formic acid
B) Acetic acid
C) Benzoic acid
D) Methanoic acid

... Answer is B)
Explanation : no.

32. Baeyer's reagent is-

A) Acetic solution of KMnO₄
B) Basic solution of KMnO₄
C) Alkaline solution of KMnO₄
D) Acetic solution of K₂Cr₂0₇

... Answer is C)
Explanation : no.

33. What is the monomer of natural rubber?

A) Isoprene
B) Isobutane
C) Acetylene
D) Propylene

... Answer is A)
Explanation : no.

34. Which of the isoelectronic of C atom?

A) C⁺
B) Na⁻²
C) Al⁺²
D) N⁺

... Answer is D)
Explanation : no.

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

A) 1N
B) 0.1N
C) 0.2N
D) 2.1N

... Answer is B)
Explanation : Molecular weight of NaOH is 40.

36. Which of the following element is least reactive?

A) Na
B) Au
C) Cu
D) Pb

... Answer is D)
Explanation : no.

37. Limonite is the ore of

A) Fe
B) Cu
C) Zn
D) Al

... Answer is A)
Explanation : no.

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

A) NaNO₃
B) K₂CO₃
C) MgCl₂
D) Mg(HCO₃)₂

... Answer is C)
Explanation : no.

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

A) 4×10²³
B) 4×10²¹
C) 6.023×10²³
D) 6.023×10²²

... Answer is D)
Explanation : no.

40. What is the percentage of nitrogen in atmosphere?

A) 0.03%
B) 21%
C) 48%
D) 78%

... Answer is D)
Explanation : no.

41. Which is made plaster of Paris after heating?

A) Bleaching powder
B) Baking powder
C) Gypsum
D) Limestone

... Answer is C)
Explanation : 2(CaSO₄.2H₂O)⇒2CaSO₄.H₂O+3H₂O.

42. Which acid is called king of acids?

A) HCl
B) H₂SO₄
C) HNO₃
D) H₃PO₄

... Answer is B)
Explanation : no.

43. Which of the following is more reactive halogen?

A) F
B) Cl
C) I
D) Br

... Answer is A)
Explanation : no.

44. What is the functional group of carboxylic acid?

A) -CO
B) -CHO
C) -OH
D) -COOH

... Answer is D)
Explanation : no.

45. Which of the following is redox reaction?

A) CaCO₃⇒CaO+CO₂
B) H₂+Cl₂⇒2HCl
C) CaO+2HCl⇒CaCl₂+H₂O
D) NaOH+HCl⇒NaCl+H₂O

... Answer is B)
Explanation : no.

46. What is the general formula of alkene?

A) CₙH₂ₙ
B) CₙH₂ₙ₊₂
C) CₙH₂ₙ₋₂
D) CₙH₂ₙ₊₁

... Answer is A)
Explanation : no.

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

A) Gold
B) Iron
C) Aluminium
D) Silver

... Answer is D)
Explanation : no.

48. What is the chemical name of heavy water?

A) Deuterium trioxide
B) Deuterium dioxide
C) Deuterium oxide
D) Triteum oxide

... Answer is C)
Explanation : no.

49. Solder is alloy of-

A) Cu and Zn
B) Sn and Pb
C) Cu and Sn
D) Zn and Al

... Answer is B)
Explanation : no.

50. Concentration of sulphide ore is done by

A) Froth flotation method
B) Calcination
C) Leaching process
D) Magnetic separation process

... Answer is A)
Explanation : no.

51. What is the formula of blue vitriol?

A) ZnSO₄.5H₂O
B) CuSO₄.5H₂O
C) MgSO₄.6H₂O
D) Ca(NO₃)₂

... Answer is B)
Explanation : no.

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

A) Ni
B) CU
C) Fe
D) Pt

... Answer is A)
Explanation : no.

53. What is the number of α and β particles which is emitted in nuclear reaction ₉₀Th²³⁸⇒₈₃Bi²¹²

A) 3α,3β
B) 4α,1β
C) 8α,1β
D) 4α,7β

... Answer is B)
Explanation : no.

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

A) C₂H₂
B) C₂H₆
C) C₂H₄
D) CH₄

... Answer is C)
Explanation : no.

55. Hydrogen bomb is based on the principle of

A) Nuclear fission
B) Nuclear fusion
C) Nuclear disruption
D) Thermal decomposition

... Answer is B)
Explanation : no.

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

A) Methane
B) Ethane
C) Athylene
D) Acetylene

... Answer is D)
Explanation : no.

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

A) Br₂
B) Cl₂
C) F₂
D) Hg

... Answer is A)
Explanation : no.

58. Which of the following is detergent?

A) Bakelite
B) Teflon
C) Sodium lauryl sulphate
D) Trinetro benzene

... Answer is C)
Explanation : no.

59. What is the percentage of nitrogen in urea?

A) 40%
B) 46.67%
C) 60%
D) 28%

... Answer is B)
Explanation : Formula of urea is NH₂CONH₂.

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

A) 9:44
B) 44:9
C) 9:81
D) 4:54

... Answer is B)
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-

A) 35:31
B) 31:35
C) 17:43
D) 4:76

... Answer is B)
Explanation : no.

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

A) 10
B) 7
C) 8
D) 9

... Answer is D)
Explanation : no.

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

A) 250.25cm³
B) 225.50cm³
C) 25.50cm³
D) 50.25cm³

... Answer is A)
Explanation : no

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

A) 1:1
B) 1:3
C) 3:1
D) 2:3

... Answer is C)
Explanation : no.

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

A) 1:3
B) 3:1
C) 8:7
D) 7:8

... Answer is D)
Explanation : no.

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

A) ac-bd+bc+ad
B) ac+bd-bc-ad
C) ac+bd+bc+ad
D) ac-bd+bc-ad

... Answer is A)
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?

A) 46°C
B) 48°C
C) 49°C
D) 53°C

... Answer is B)
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?

A) 5 liters
B) 10 liters
C) 15 liters
D) 20 liters

... Answer is A)
Explanation : no.

69. If x=rsinαcosβ,y=rsinαsinβ and z=rcosα,then the value of (x²+y²) is-

A) r²+z²
B) r²-z²
C) r²z²
D) rz

... Answer is B)
Explanation : no.

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

A) 350cm
B) 400cm
C) 4000cm
D) 4400cm

... Answer is D)
Explanation : no.

71. sin(60°+θ)-cos(30°+θ)=

A) sinθ
B) cosθ
C) 0
D) 1

... Answer is A)
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?

A) 30m
B) 40m
C) 48m
D) 58m

... Answer is C)
Explanation : no.

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

A) 9999
B) 9982
C) 8820
D) 7420

... Answer is C)
Explanation : no.

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

A) 6:1:2
B) 1:2:6
C) 6:2:1
D) 1:6:2

... Answer is B)
Explanation : no.

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

A) 3/2
B) 2/3
C) 4/7
D) 9/4

... Answer is A)
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?

A) 275 rupees
B) 225 rupees
C) 200 rupees
D) 300 rupees

... Answer is B)
Explanation : no.

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

A) 18 sec
B) 8 sec
C) 15 sec
D) 28 sec

... Answer is A)
Explanation : no.

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

A) sinA
B) cosA
C) tanA
D) secA

... Answer is B)
Explanation : no.

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

A) 10%
B) 11%
C) 21%
D) 100%

... Answer is C)
Explanation : no.

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

A) x²+2x-4=0
B) x²+2x+4=0
C) x²-2x+4=0
D) x²-2x-4=0

... Answer is A)
Explanation : no.

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

A) 1%
B) 2%
C) 3%
D) 4%

... Answer is A)
Explanation : no.

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

A) 119
B) 3
C) 7
D) 11

... Answer is C)
Explanation : no.

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

A) 1
B) 2
C) 3
D) 4

... Answer is D)
Explanation : no.

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

A) 12167cm³
B) 6780cm³
C) 2469cm³
D) 534cm³

... Answer is A)
Explanation : no.

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

A) 0
B) 1
C) -1
D) 3

... Answer is C)
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?

A) 20 year,50 year
B) 50 year,20 year
C) 50 year,30 year
D) 20 year,40 year

... Answer is 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?

A) p=2x
B) p=3x
C) p=4x
D) p=6x

... Answer is B)
Explanation : no.

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

A) x+4
B) x-4
C) 3x+4
D) 3x-4

... Answer is D)
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?

A) 6
B) 12
C) 9
D) 18

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

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

A) 0
B) 1
C) -1
D) 2

... Answer is A)
Explanation : no.