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CBSE CLASS X

Mathematics

81. If a , b are the zeros of the polynomial

82. The HCF of the smallest composite number and the smallest prime number.
    

    (a) 1

    (b) 2

    (c) 4

    (d) none of these

83. If then find the value of λ is

(a) 0

(b) cos² θ

(c) 1

(d) -1

84. If p, q are two co- prime numbers. HCF (p, q) is :
    

    (a) p

    (b) q

    (c) pq

    (d) 1

85. 

(a) 1

(b) - 1

(c) 2

(d) 0

86. If 29x + 37 y = 103 and 37x + 29y = 95, then :
    

(a) x = 1, y = 2

(b) x = 2, y = 1

(c) x = 2, y = 3

(d) x = 3, y = 2

87. Square of any positive integer is of the form.

    (a) 3q +1

    (b) 3q

    (c) both a and b

    (d) none

88. If ∆PQR is right angled at R, then the value of cos (P+Q) is

(a) 1

(b) 0

(c) ½

(d)

89. 119² −111² is
    

    (a) prime number

    (b) composite

    (c) an odd prime number
    

    (d) an odd composite number

90. The empirical relationship among the Median, Mode and Mean of a data is :
    

    (a) mode = 3 median + 2 mean
    

    (b) mode = 3 median - 2 mean
    

    (c) mode = 3 mean - 2 median
    

    (d) mode = 3 mean + 2 median

Submitted By Mr. Agyat Gupta
E-mail :- [email protected]