CBSE Class 10 Maths | Some Applications of Trigonometry Chapter 9 MCQ
CBSE CLASS 10 MATHEMATICS/ MCQ
Multiple Choice Questions / SOME APPLICATIONS OF TRIGONOMETRY –Chapter 9
1. ————– is used for finding the heights and distances of various objects,without actually measuring them.
A. Statistics
B. Trigonometry
C. Geometry
2. The line drawn from the eye of an observer to the point in the object viewed by the observer is ——————
A. Line of sight
B. Line segment
C. Line of contact
3. The ——— of an object viewed, is the angle formed by the line of sight with the horizontal when it is above the horizontal level.
A. Angle of elevation
B. Angle of depression
C. Angle of repose
4. The height or length of an object, or the distance between two distant objects can be determined with the help of —————–
A. Trigonometric identities
B. Trigonometric ratios
C. Trigonometric formulae
5. A girl sitting on the balcony is looking down at a flower pot placed on a stair of the temple. The angle so formed by the line of sight with the horizontal is called the ——————-
A. Angle of elevation
B. Angle of depression
C. Angle of repose
6. The student is looking at the top of the minar. The angle, so formed by the line of sight with the horizontal is called the ——————-
A. Angle of elevation
B. Angle of depression
C. Angle of repose
7. A circus artist is climbing a 20 m long rope, which is tightly stretched and tied from the top of a vertical pole to the ground. Then the height of the pole is ————— if the angle made by the rope with the ground level is 30 degree.
A. 10m
B. 20 m
C. 40m
8. When we lower our head to look at the point being viewed, then the angle formed with the horizontal is ——————
A. Angle of elevation
B. Angle of depression
C. Angle of repose
9. When we raise our head to look at the object, then the angle formed with the horizontal is —————–
A. Angle of elevation
B. Angle of depression
C. Angle of repose
10. An observer 1.5 m tall is 28.5 m away from a chimney. The angle of elevation of the top of the chimney from her eyes is 45 degree. Then the height of the chimney is —————
A. 27m
B. 30 m
C. 33 m
ANSWERS:
1. Trigonometry
2. Line of sight
3. Angle of elevation
4. Trigonometric ratios
5. Angle of depression
6. Angle of elevation
7. 10m
(Consider a right triangle ABC right angled at B. Take angle C = 30 degree and AC = 20m.Then sin30 = AB/AC =
½ = AB/ 20
AB = 10 m)
8. Angle of depression
9. Angle of elevation
10. 30m
(28.5 + 1.5 = 30)