1
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?
A
2h
B
$${{3h} \over 2}$$
C
h
D
$${{h} \over 2}$$
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?
A
60$$^\circ$$
B
45$$^\circ$$
C
30$$^\circ$$
D
15$$^\circ$$
3
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) ?
A
$${{r\sin \beta } \over {\sin \left( {{\alpha \over 2}} \right)}}$$
B
$${{r\sin \beta } \over {\sin \left( {{\alpha \over 4}} \right)}}$$
C
$${{r\sin \left( {{\beta \over 2}} \right)} \over {\sin \alpha }}$$
D
$${{r\sin \alpha } \over {\sin \left( {{\beta \over 2}} \right)}}$$
4
NDA 2019 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
A ladder 9m long reaches a point 9m below the top of a vertical flagstaff. From the foot of the ladder, the elevation of the flagstaff is 60$$^\circ$$. What is the height of the flagstaff?
A
16.7m
B
10.5m
C
13.5m
D
15m
EXAM MAP