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SSCCGL Quantitative Aptitude Solved Question Paper 2017

Multiple Choice Questions

71.

If $cot space straight theta space equals space 21 over 20 comma$ then what is the value of cosec θ?

$21 over 29$
$29 over 21$
$20 over 29$
$29 over 20$

72.
The two equal sides of an isosceles triangle is 20 cm each and the third side is 30 cm. What is the area (in cm²) of the triangle?

$50 square root of 5 space cm squared$

100 cm²

$75 square root of 7 space cm squared$

175 cm²

$75 square root of 7 space cm squared$

Area of isosceles triangle
$equals space 1 fourth space cross times space straight b space cross times space square root of 4 straight a squared space minus space straight b squared end root equals space 1 fourth space cross times space 30 space cross times space square root of 4 space cross times space left parenthesis 20 right parenthesis squared space minus space left parenthesis 30 right parenthesis squared end root equals space 15 over 2 cross times space square root of 1600 space minus space 900 end root equals space 15 over 2 space cross times space square root of 700 space equals space fraction numerator 15 space cross times space 10 square root of 7 over denominator 2 end fraction space equals space 75 square root of 7 space cm squared$

73.

PQ is the chord of a circle whose centre is O. ROS is a line segment originating from a point R on the circle that intersect PQ produced at point S such that QS = OR. If