NDA Mathematics 18 April 2021 | NDA Year Wise Previous Years Questions

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NDA Mathematics 18 April 2021

MCQ (Single Correct Answer)

+2.5

-0.83

What is the interior angle of a regular octagon of side length 2 cm?

$\dfrac{\pi}{2}$

$\dfrac{3\pi}{4}$

$\dfrac{3\pi}{5}$

$\dfrac{3\pi}{8}$

NDA Mathematics 18 April 2021

MCQ (Single Correct Answer)

+2.5

-0.83

If 7 sinθ + 24 cosθ = 25, then what is the value of (sin θ + cos θ)?

$\dfrac{26}{25}$

$\dfrac{6}{5}$

$\dfrac{31}{25}$

NDA Mathematics 18 April 2021

MCQ (Single Correct Answer)

+2.5

-0.83

A ladder 6 m long reaches a point 6 m below the top of a vertical flagstaff. From the foot of the ladder, the elevation of the top of the flagstaff is 75°. What is the height of the Flagstaff?

11 m

9 m

(6 + √3) m

(6 + 3√3) m

NDA Mathematics 18 April 2021

MCQ (Single Correct Answer)

+2.5

-0.83

The shadow of a tower is found to be x meter longer, when the angle of elevation of the sun changes from 60° to 45°. If the height of the tower is 5(3 + √3) m, then what is x equal to?

8 m

10 m

12 m

15 m

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