CBSE Important Questions

Mathmatics Class X

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

    (a) 45 0

    (b) 150

    (c) 600

    (d) 300

  2. 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

    3. (a) 2

    (b) 3

    (c) 5

    (d) 11

  1. Decimal representation in the form of

    2. (a) 37330/ 111

    (b) 37330/ 999

    (c) 3733/ 999

    (d) none of these

  1. 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 .

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

    (a) 3 places

    (b) 4 places

    (c) 5 places

    (d) 1 place

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

    4. (a) 0

    (b) 1/2

    (c) 1/6

    (d) -1

  1. 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

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

    (a) Coprime

    (b)Not coprime

    (C) Odd numbers

    (d) Even numbers

  3. If θ is acute and then θ

    4. (a) 600

    (b) 300

    (c) 900

    (d) 450

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