Mathematics Application of Trigonometry Online Test

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Question 1

1. r₃ =

Answer

s tan ϒ/2

Answer

s tan β/2

Question 2

2.

Question 3

3.

Question 4

4. If for a ∆ ABC, a = 7, b = 9, c = 7, then ϒ = ?

Question 5

5. The angle AOP which the ray from an observer’s eye at O to an object at P at a higher r level makes with horizontal ray OA through O is called the

Answer

Constant angle

Answer

Angle of elevation

Answer

Right angle

Answer

Angle of depression

Question 6

6. Number of elements of triangle is known as

Answer

Trigonometry

Answer

None of these

Question 7

7. The angles of elevation of the top of a tower at the top and the foot of a pole of height 10 m are 30° and 60° respectively. The height of the tower is

Answer

None of these

Question 8

8. If a = 13, b = 14, c = 15, then r₂ =

Question 9

9. The area of a triangle with a = 300, b = 120, ϒ = 150° is

Answer

5000 square units

Answer

7000 square units

Answer

9000 square units

Answer

6000 square units

Question 10

10. a/sina = b/sinβ – c/sinϒ is law of

Question 11

11. Hero’s formula is used to calculate

Answer

Angles of ∆

Answer

Area of ∆

Answer

Sides of ∆

Answer

None of these

Question 12

12. R =

Question 13

13. The point of intersection of the internal bisector of one angle and external bisectors of the other two angles of a triangle is known as

Answer

In – center

Answer

None of these

Answer

Circum – Center

Answer

Ex – center

Question 14

14. r₃ =

Answer

∆/s – b

Answer

∆/s – a

Answer

∆/s – c

Answer

s – a/∆

Question 15

15. Which one is true?

Answer

cos a = a²+b²+c²/2ab

Answer

a²=b²+c² - 2bc cos a

Answer

a²+b²+c² = 2abcos a

Answer

b² = a²+c²+2ac cos β

Question 16

16.

Question 17

17. The x – center with respect to the vertex B is the point of intersection of the

Answer

External bisector of A and B and internal bisector of C

Answer

External bisectors of A and C and internal bisector of B

Answer

External bisectors of A, B and C

Answer

External bisectors of B and C and internal bisectors of A

Question 18

18. 1/ab + 1/bc + 1/ca =

Question 19

19. If ∆ is the area of a triangle ABC, then ∆ =

Answer

b²sina/2sinβ sinϒ

Answer

a²sina/2sinβ sinϒ

Answer

a²sinβ sinϒ/2 sin a

Answer

c²sina/2sinβ sinϒ

Question 20

20. AB is a vertical pole and C is its middle point. The end A is on the level ground and P is any point on the level ground other than A. the portion CB subtends and angle β at P. If AP:AB = 2:1 then β =

Answer

tan⁻¹ 5/9

Answer

tan⁻¹ 1/9

Answer

tan⁻¹ 4/9

Answer

tan⁻¹ 2/9

Question 21

21. An airplane flying at a height of 300 meters above the ground passes vertically above another place at an instant when the angle of elevation of the two planes from the same point on the ground are 60° and 45° respectively. Then the height of the lower plane from the ground is (in meters).

Answer

150(√3+1)

Question 22

22. A man of height 6 ft observes the top of a tower and the foot of the tower at angles of 45° and 30° of elevation and depression respectively. The height of the towers is

Answer

3(1 + √3)m

Answer

6(1 + √3)m

Answer

(1 + √3)m

Answer

None of these

Question 23

23. 4 R sin a/2 sin β/2 sin ϒ/2 =

Question 24

24. If you are looking someone on the ground from the op a hill, the angle formed is the

Answer

Angle of elevation

Answer

Constant angle

Answer

Right angle

Answer

Angle of depression

Question 25

25. Sum of opposite angles of a cyclic quadrilateral is

Question 26

26. For a triangle, ∆ = 888 and s = 24, then radius of in circle is

Question 27

27. Law of cosine is

Answer

a² + 2ab cos a = b² + c²

Answer

Cos a = b²+c²–a²/2bc

Answer

c²=a²+b² – 2ab Cos y

Answer

All of these

Question 28

28. An angle below the horizontal line and line of sight is called

Answer

Angle of depression

Answer

Angle of elevation

Answer

Right angle

Answer

None of these

Question 29

29.

Question 30

30.

Question 31

31. If a = 315, b = 346, c = 120 then product of the three sides = ?

Question 32

32. The angle above horizontal line and the line of sight is an angle of

Answer

None of these

Answer

Depression

Question 33

33. E – radius corresponding to

Answer

∆/s – a

Answer

∆/s – c

Answer

∆/s – b

Question 34

34. √rr₁r₂r₃ = ?

Answer

½ bc sin β

Question 35

35. If a, b, c are the sides of the triangle ABC, then s =

Question 36

36. Pythagorous theorem is solve

Answer

Right – triangles

Answer

Oblique triangles

Answer

None of these

Answer

Rectangles

Question 37

37. At the top of a cliff 80 m high, the angle of depression of a boat is 12°. The distance of the boat from the cliff is

Question 38

38. If β = 52°,ϒ = 89°35’, a = 89.35 in a triangle ABC, then

Answer

B = 13.3, c = 43.8

Answer

B = 143.8, c = 113.3

Answer

B = 43.8, c = 13.3

Answer

B = 113.3, c = 143.8

Question 39

39. cot a/2 =

Question 40

40. If a flagstaff 6 meters high placed on the top of a tower throws a shadow of 2√3 meters along the ground then the angle (in degrees) that the sun makes with the ground is

Answer

None of these

Question 41

41. 4R cos ½ a sin ½ β cos ½ ϒ =

Question 42

42. Circum radius of a circle is denoted by

Question 43

43. In ∆ ABC, a²+b²-c²/2ab is

Answer

None of these

Question 44

44. R =

Question 45

45. A tree of 8 m high has the shadow 6m in length, the angle of elevation of the sun at that moment is

Question 46

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Total Questions:	45
Time Allowed:	20 Minutes
Total Marks:	45
How to Attempt Test:	Please choose the right Option in MCQ-type question.
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Important Math Application of Trigonometry Question and Answer

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