SOLVED PAPER OF DIARY FARM INSTRUCTOR IN KERALA DIARY DEVELOPMENT DEPARTMENT, EXAM HELD ON 24-10-2009

1. An element forms compound of formula ACl₃, A₂O₅, and MgA₂, but does not form ACl₅. Which of the following could A be?
Ans: Nitrogen

2. Which of the following statement is incorrect?
Ans: The molecules BF3 and NF3 are covalent compounds. But BF3 is polar and NF3 is non-polar.

3. The pH solution containing 0.10 M sodium acetate and 0.03 M acetic acid is (pKa for CH₃COOH=4.57)
Ans: 5.09

4. IUPAC name of CH₃-CH₂-C≡C-CO-CH₂CH₃ is?
Ans: Hept-4-yn-3-one

5. Which one among the following suppressed the photochemical smog?
Ans: Radical trap

6. Which of the following statement is correct?
Ans: In Antarctica ozone depletion is due to the formation of chlorine nitrate

7. The osmotic pressure of 5% solution of cane sugar at 1500 C (molecular mass of sugar=342) is:
Ans: 5.07 atm

8. In the Nickel-Cadmium (NICAD) cell, NiO2 is :
Ans: The cathode in the discharging period

9. The solution of nickel sulphate in which nickel rod is dipped is diluted 10 times. The potential of nickel:
Ans: Decreases by 30 mV

10. In the Victor-Meyer’s test, the colours given by 1o, 2o and 3o alcohols are respectively?
Ans:Red, Blue, Colourless

11. Acetaldehyde can not show :
Ans:Lucas Test

12. Orbital interaction between the sigma bonds of a substituent group and a neighboring pi orbital is known as :
Ans:Hyperconjugation

13. During dehydration of alcohols to alkenes by heating with concentrated H2SO4
the initiation step is :
Ans:Protonation of alcohol molecule

14. Among the amines (I) C₆H₅NH₂ ,(II)CH₃NH₂, (III)(CH₃)₃NH, (IV)(CH₃)₃N the order of basicity is :
Ans:I

15. In both DNA and RNA, heterocyclic base and phosphate ester linkages are at:
Ans: C1| And C5| respectively of the sugar molecule

16. Ethylene oxide is added to soft drinks as an additive to function as a/an:
Ans: Preservative

17. Which one of the following can be used as a bleaching agent in detergents?
Ans:Perborate

18. Pick out the statement which is not true?
Ans:Pyrethrum is a disinfectant

19. Which of the following gives maximum energy in metabolic process?
Ans: Cerebroside

20. Which one is a broad spectrum antibiotic?
Ans:Tetracycline

21. Phyllode is a modification of :
Ans:Petiole

22. Epicalyx is :
Ans: A whorl of bracteols

23. The outer covering of nonmyelinated neurons in brain is :
Ans: Axolemma

24. Saliva converts:
Ans: Starch into maltose

25. Respiratory mechanism is controlled by :
Ans: Central nervous system

26. Blood to the diaphragm is supplied by :
Ans: Phrenic artery

27. The living substance of the cell was called sarcode by :
Ans:Dujardin

28. Plasma membrane is made of:
Ans:Proteins, lipids and carbohydrates.

29. Ribosomes are the centre for :
Ans.Protein Synthesis

30. Cristae take part in :
Ans:Respiration

31. Principal protein of cilia and flagella is :
Ans: Tubulin

32. Pollen grains represent:
Ans: Immature male gametophyte

33. Site of fertilization in a mammal is :
Ans: Fallopian tube

34. Function of Sertoli cells is to:
Ans: Nourish sperms

35. For successful implantation of the embryo in the uterine wall, which hormone is necessary?
Ans: Progesterone

36. Ovulation is induced by :
Ans:LH

37. Neo-Darwinism was supported by :
Ans:Huxley and Haeckal

38. Idiogram means:
Ans: Diagrammatic representation of chromosome

39. A circular DNA present in bacterial cell along with main chromosomes is known as :
Ans: Plasmid

40. Which is commonly considered as a biologist’s paradise?
Ans.Nilgiri Biosphere Reserve

41. Which among the following is an empty set?
Ans:{}

42. If P={1,2,3,4,5} and Q={4,5,6,7}, then P-Q is:
Ans: {1,2,3}

43. MU(N∩P) is :
Ans: (MUN) ∩ (MUP)

44. In which quadrant all the trigonometric ratios have the same sign?
Ans: 1

45. Sec(-225o) is :
Ans: -√2

46. The radian measure corresponding to 25o30| is :
Ans:51π/360

47. If the solution set of the equation ax2+bx+c=0 is {α, β} then α-β is:
Ans:√(b2-4ac)/a

48. If i=√-1 then the sum of i+i2+i3+…. 100 terms is equal to:
Ans: 0

49. The number of different permutations of the letters of the word ‘JANAB’ is :
Ans: 60

50. If x, 2x+2, 3x+3 are in G.P. then the next term is :
Ans: -13.5

51. If Matrix A= 1 0
2 0


and Matrix B=0 0
1 2 then:

Ans:AB=0, BA≠0

52. The inverse of Matrix 1 1

0 1
Ans: 1 -1
0 1

53. Let A be a square matrix of order 3. If |A|=-3, then the value of the determinant of A.adj A is :
Ans: -27

54. If A= a x is a symmetric matrix, then:
y 0
Ans: x=y

55. The mean deviation of the numbers 1, 1+k,1+2k….,1+51k from their mean is 130, then k is equal to :
Ans:10.2

56. Variations of 10 observations is 5. If each of the observation is multiplied by 3 then the variance of the resulting observations is :
Ans:25

57. Dhanya visits four cities P, Q, R and S at random. What is the probability that she visits Q either first or second?
Ans:1/2

58. For a binomial distribution B(5, p) If P(x=1)=8 P(x=3) then p is :
Ans:1/5

59. Let f(x) = 3x-4 ; 0≤x≤3

x+k ; 3

If f(x) is continuous at x=3 then the value of k is :

Ans: 2

60. The function f(x)=x3+px2+qx in 1≤x≤2 satisfies the conditions of Rolle’s theorem and the point so obtained is 4/3. Then the value of p and q are respectively:
Ans: -5, 8

61. One among the following is not considered as a Platform test?
Ans: Gerber’s test

62. Milk is rich in ------------- mineral:
Ans: Calcium

63. Which country is the largest producer of milk in the world?
Ans: India

64. The total Buffalo population in Kerala is less than :
Ans: One Lakh

65. One among the following is not a Milch breed of cattle?
Ans: Amritmahal

66. The acid used for coagulating milk when paneer is prepared:
Ans: Citric acid

67. Dry ice is also called as:
Ans: Solid Carbon Dioxide

68. Dry steam which is further heated at a constant pressure thus raising its temperature is called as:
Ans: Superheated steam

69. Letting down of milk is due to the release of :
Ans: Oxytocin

70. The true stomach in ruminant is :
Ans: Abomasum

71. According to PFA table butter should contain not less than -----% fat :
Ans: 80

72. As per PFA standards toned milk should have minimum :
Ans: 3.0% fat

73. Deficiency of magnesium produces-------- disease in adult ruminants:
Ans: Grass staggers

74. A variety of grass which considered as “friend of the poor”:
Ans: Dheenanath Grass.

75. The Malayalam name of Gliricida :
Ans: Seemakonna

76. Which one among the following is the most heat resistant pathogen :
Ans: Clostridium botulinum

77. Microbial contaminants suspended in air are referred to as :
Ans: Aerosols

78. The pricing system of milk followed by APCOS:
Ans: Two axis pricing policy

79. The milk powder plant in Kerala is located at ------ District:
Ans:Alappuzha

80. The operation food programme in the country is implemented by :
Ans:NDDB

81. Action and reaction :
Ans:All are correct

82. A ball of mass of 10gm strikes a wall with a velocity of 5m/s and rebounds making a perfectly elastic collision. The impulse is then given by :
Ans: 0.1 kgms-1

83. The slope of the displacement time graph gives us the :
Ans:Velocity

84. A particle moves along a straight line according to the law S2=at2+2bt +c. The acceleration of the particle varies as:
Ans: S-3

85. A body is projected at an angle of 30o to the horizontal with kinetic energy 40J. What will be the Kinetic energy at the topmost point?
Ans:30J

86. Work done by all the forces(external and internal) on a system equals the change in :

Ans: Kinetic Energy

87. The Bulk modulus of elasticity in the case of an adiabatic expansion is :
Ans: γp

88. When a soap bubble of radius r is connected to a bubble of radius R(r
Ans: smaller bubble will decrease and larger bubble will increase

89. Milk is an example of :
Ans:Emulsion

90. The standard reduction potentials of Li+/Li, Ba2+/Ba, Na+/Na and Mg 2+/Mg are -3.05, -2.73, -2.71 and -2.37 volts respectively. Which one of the following is strongest oxidizing agent?
Ans:Na+

91. To stop bleeding, Fe Cl3 is applied locally because:
Ans: Fe Cl3 causes denaturation of proteins present in the blood.

92. Half-life of a radio active substance A is 2 times the half life of another radio active substance B. Initially the number of nuclei of A and B are NA and NB respectively. After three half lives of A number of nuclei of both become equal, the ration NA/NB is :
Ans:1/8

93. For an isochoric process:
Ans: The volume remains the same

94. The criteria for a process to be reversible is that:
Ans: It must obey both the above conditions:

95. If the temperature of the source is double that of the sink then the efficiency of the Carnot’ engine is :
Ans: 50%

96. The amount of heat energy generated by a perfectly black body per second per unit area and maintained at a temperature of T:
Ans: Is directly proportional tio T4

97. The impedance in an LCR circuit in which the inductive reactance is equal to the cacacitive reactance:
Ans: R

98. If the unit of self inductance is Henry then unit of mutual inductance will be:
Ans: Henry

99. A transformer has a turn ration of 1:10. If the current in the primary has a peak value of 5A, then the current in the secondary will be :
Ans: 0.5 A

100. 1 kilowatt hour is :
Ans: 3.6 x 106 Joules.