NDA 2018 Paper 2 | Height and Distance Question 8 | Mathematics

A balloon is directly above one end of a bridge. The angle of depression of the other end of the bridge from the balloon is 48$$^\circ$$. If the height of the balloon above the bridge is 122m, then what is the length of the bridge?

122 sin48$$^\circ$$ m

122 tan42$$^\circ$$ m

122 cos48$$^\circ$$ m

122 tan48$$^\circ$$ m

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

The top of a hill observed from the top and bottom of a building of height h is at angles of elevation $${\pi \over 6}$$ and $${\pi \over 3}$$ respectively. What is the height of the hill?

$${{3h} \over 2}$$

$${{h} \over 2}$$

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

If a flage-staff of 6m height placed on the top of a tower throws a shadow of $$2\sqrt 3 $$ m along the ground, then what is the angle that the sun makes with the ground?

60$$^\circ$$

45$$^\circ$$

30$$^\circ$$

15$$^\circ$$

NDA 2018 Paper 2

MCQ (Single Correct Answer)

+2.5

-0.83

A spherical balloon of radius r subtends an angle $$\alpha$$ at the eye of an observer, while the angle of elevation of it centre is $$\beta$$. What is the height of the centre of the balloon (neglecting the height of the observer) ?

$${{r\sin \beta } \over {\sin \left( {{\alpha \over 2}} \right)}}$$

$${{r\sin \beta } \over {\sin \left( {{\alpha \over 4}} \right)}}$$

$${{r\sin \left( {{\beta \over 2}} \right)} \over {\sin \alpha }}$$

$${{r\sin \alpha } \over {\sin \left( {{\beta \over 2}} \right)}}$$

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