9th Class Mathematics Chapter 6 Test06. Trigonometry and Bearing

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. If a tower is 100 m high and tan θ = 1, horizontal distance from tower is:
   1. 50 m
   2. 100 m
   3. 150 m
   4. 200 m
2. To convert degrees into radians, multiply by:
   1. π/180
   2. 180/π
   3. 60
   4. 360
3. Bearing of South is:
   1. 090°
   2. 180°
   3. 270°
   4. 360°
4. A bearing of 050° means:
   1. 50° clockwise from north
   2. 50° clockwise from south
   3. 50° anticlockwise from east
   4. 50° clockwise from west
5. $- 3 - 3tan^2θ = ?$
   1. $3cosec^2θ$
   2. $-3cosec^2θ$
   3. $-3sec^2θ$
   4. $3sec^2θ$
6. One degree is equal to:
   1. 30′
   2. 60′
   3. 90′
   4. 120′
7. Angle of elevation and corresponding angle of depression between parallel horizontals are:
   1. Complementary
   2. Equal
   3. Supplementary
   4. Always 90°
8. Area of a sector is:
   1. rθ
   2. ½r²θ
   3. πr²
   4. 2πr
9. Reciprocal of sin θ is:
   1. sec θ
   2. cosec θ
   3. cot θ
   4. cos θ
10. If cos α = sin θ for acute angles, then α + θ is:
    1. 45°
    2. 60°
    3. 90°
    4. 180°