Question

Multiple choice questions:-

1. In ∆ ABC, right-angled at B, AB = 24 cm, BC = 7 cm. The value of tan C is:

(a)12/7

(b)24/7

(c)20/7

(d)7/24

2. (Sin 30°+cos 60°)-(sin 60° + cos 30°) is equal to:

(a)0

(b)1+2√3

(c)1-√3

(d)1+√3

3. The value of tan 60°/cot 30° is equal to:

(a)0

(b)1

(c)2

(d)3


4. 1-cos2A is equal to:

(a)sin2A

(b)tan2A

(c)1-sin2A

(d)sec2A

5. Sin (90° – A) and cos A are:

(a)Different

(b)Same

(c)Not related

(d)None of the above


6. If cos X = ⅔ then tan X is equal to:

(a)5/2

(b)√(5/2)

(c)√5/2

(d)2/√5

7. If cos X=a/b, then sin X is equal to:

(a)b²-a²/b

(b)b-a/b

(c)√(b²-a²)/b

(d)√(b-a)/b


8. The value of sin 60° cos 30° + sin 30° cos 60° is:

(a)0

(b)1

(c)2

(d)4


9. 2tan 30°/1+tan230° =

(a)Sin 60°

(b)Cos 60°

(c)Tan 60°

(d)Sin 30°


10. sin 2A = 2 sin A is true when A =

(a)30°

(b)45°

(c)0°

(d)60°

11. If the length of the shadow of a tree is decreasing then the angle of elevation is:

(a)Increasing

(b)Decreasing

(c)Remains the same

(d)None of the above


12. The angle of elevation of the top of a building from a point on the ground, which is 30 m away from the foot of the building, is 30°. The height of the building is:

(a)10 m

(b)30/√3 m

(c)√3/10 m

(d)30 m


13. If the height of the building and distance from the building foot’s to a point is increased by 20%, then the angle of elevation on the top of the building:

(a)Increases

(b)Decreases

(c)Do not change

(d)None of the above

14. If a tower 6m high casts a shadow of 2√3 m long on the ground, then the sun’s elevation is:

(a)60°

(b)45°

(c)30°

(d)90°

15. The angle of elevation of the top of a building 30 m high from the foot of another building in the same plane is 60°, and also the angle of elevation of the top of the second tower from the foot of the first tower is 30°, then the distance between the two buildings is:

(a)10√3 m

(b)15√3 m

(c)12√3 m

(d)36 m

16. The angle formed by the line of sight with the horizontal when the point is below the horizontal level is called:

(a)Angle of elevation

(b)Angle of depression

(c)No such angle is formed

(d)None of the above

17. The angle formed by the line of sight with the horizontal when the point being viewed is above the horizontal level is called:

(a)Angle of elevation

(b)Angle of depression

(c)No such angle is formed

(d)None of the above

18. From a point on the ground, which is 15 m away from the foot of the tower, the angle of elevation of the top of the tower is found to be 60°. The height of the tower standing straight is:

(a)15√3

(b)10√3

(c)12√3

(d)20√3

19. The line drawn from the eye of an observer to the point in the object viewed by the observer is said to be

(a)Angle of elevation

(b)Angle of depression

(c)Line of sight

(d)None of the above

20. The height or length of an object or the distance between two distant objects can be determined with the help of:

(a)Trigonometry angles

(b)Trigonometry ratios

(c)Trigonometry identities

(d)None of the above



give me all the answers​

Answer 1

Answer:

1.24/7

2.1

3.1

4.sin^2 A.

5.i dont know.

6.root over 5/3.

Answer 2

Answer:

1-B

2-A

3-B

4-A

5-B

6-C

7-B

8-A

9-C

10-C

11-B