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Solve Mathematics Question Paper (Set-2) CBSE 2012, given here.
1. If 1 is a root of the equations ay2 + ay + 3 = 0 andy2 +y + b = 0, then a equals:
(A) 3
(B) -7/2
(C) 6
(D) -3
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2. The sum of first 20 odd natural numbers is:
(A) 100
(B) 210
(C) 400
(D) 420
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5. If the radius of the base of a right circular cylinder is halved, keeping the
height the same, then the ratio of the volume of the cylinder thus obtained
to the volume of original cylinder is
(A) 1:2
(B) 2:1
(C) 1:4
(D) 4:1
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6. If the area of a circle is equal to sum of the areas of two circles of diameters 10 cm and 24 cm, then the diameter of the larger circle (in cm) is
(A) 34
(B) 26
(C) 17
(D) 14
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