Question

56. If marginal cost=2x+3 then MAC is,

a) x+3

b) 2

c) 3

d) 5

57. If marginal cost=2x+3 then MAC at x=5 is,

a) 13

b) 10

c) 2

d) 5

58. If y= 2x4 +4 then dy/dx is,

a) 2x+4

b) 8x

c) 2

d) 2x

59. The total revenue received from the sale of x units of an article is given by R(x) = 3x² +

36x + 5. The marginal revenue when x = 15 is,

a) 126

b) 116

c) 96

d) 90

60. If f ‘ (a) =0 and f”

(a) < 0 then f has -------

a) a maximum at x=a

b) a minimum at x=a

c) a decreasing at x=a

d) a increasing at x=a

61. If f ‘ (a) =0 and f” (a) > 0 then f has -------

a) a maximum at x=a

b) A Minimum at x = a

c) a decreasing at x=a

d) a increasing at x=a

62. If x is real, the minimum value of x² – 8x + 17 is

a) -1

b) 0

c) 1

d) 2

63. Two parts of 50, such that their product is maximum are,

a) 25 & 25

b) 49 & 1

c) 20 & 30

d) 10 & 40

64. The demand function of a commodity is p=2+4D-D

2

, where p is price. Then total revenue

is,

a) 2D+4D2

-D

3

b) 2+4D-D

2
c) 2+4D

d) 4D-D

2​

Answer 1

56. B(2)

57. A(13)

58.A(2X+4)

59.C(96)

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