Question Paper
Class / Subject: Class 10 (CBSE) · Mathematics
Chapter: Chapter 9 — Chapter 9: Some Applications of Trigonometry
Time Allowed: 15 minutes
Max Marks: 6
1. The angle formed when looking up at an object is called the angle of: [1]
(A) elevation
(B) depression
(C) reflection
(D) refraction
2. A tower's angle of elevation from a point 30m away is 30°. Using tan(30°)≈0.577, the tower's height is approximately: [1]
(A) 17.3m
(B) 30m
(B) 52m
(D) 10m
3. Heights and distances problems primarily use: [1]
(A) trigonometric ratios
(B) only the Pythagoras theorem
(C) only algebra
(D) only geometry (no trigonometry)
4. The angle of depression is formed when looking: [1]
(A) down at an object
(B) up at an object
(C) sideways at an object
(D) directly at the horizon
5. The angle of depression from a high point equals the angle of: [1]
(A) elevation from the lower point
(B) depression from the lower point
(C) refraction
(D) incidence
6. From the top of a 50m cliff, the angle of depression to a boat is 30°. Using tan(30°)≈0.577, the boat's distance is approximately: [1]
(A) 86.6m
(B) 50m
(C) 25m
(D) 100m