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CBSE CLASS X

Mathematics

91. If sin(60 − α ) =1, then the value of a is
    

    (a) 45 ⁰

    (b) 15⁰

    (c) 60⁰

    (d) 30⁰

92. If the least prime factor of a is 3, the least prime factor of b is 7, then the least prime factor of (a+b) is

(a) 2

(b) 3

(c) 5

(d) 11

93. Decimal representation in the form of

(a) 37330/ 111

(b) 37330/ 999

(c) 3733/ 999

(d) none of these

94. If sin θ = cos θ , then the value of 2 tan² θ+sin² θ-1
    

    (a) 3

    (b) 3 / 2

    (c) 7/2

    (d) none of these .

95. The decimal expansion of the rational number will terminate after :
    

    (a) 3 places

    (b) 4 places

    (c) 5 places

    (d) 1 place

96. If and αis acute, then (3cosα - 4cos α ) is equal to :

(a) 0

(b) 1/2

(c) 1/6

(d) -1

97. Given that HCF (2520, 6600) = 40, LCM (2520, 6600) = 252× k , then the value of k is :
    

    (a) 1650

    (b) 1600

    (c) 165

    (d) 1625

98. If a, b are coprime, then a²,b ²are :
    

    (a) Coprime

    (b)Not coprime

    (C) Odd numbers

    (d) Even numbers

99. If θ is acute and then θ

(a) 60⁰

(b) 30⁰

(c) 90⁰

(d) 45⁰

100. The value of cos = 15⁰ [Given
     cos( α − β ) = cos α cos β+ sin α sin β

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