# CBSE Class 10-Mathematics: Chapter –9 Some Applications of Trigonometry Part 4

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**Question 15:**

If the angles of elevation of a tower from two points at distances a and b where , from its foot and in the same straight line from it are and

(a)

(b)

(c)

(d)

**Answer:**

(b)

**Question 16:**

The angle of elevation of the top of a tower from a point on the ground which is 30 m away from the foot of the tower is , then height of tower is

(a)

(b)

(c)

(d)

**Answer:**

(a)

**Question 17:**

If height of the tower shadow of the tower, then angle of elevation is

(a)

(b)

(c)

(d)

**Answer:**

(b)

**Question 18:**

If length of shadow and angle of elevation . Then height of tower is

(a)

(b)

(c)

(d)

**Answer:**

(d)

**Question 19:**

A little boy is flying a kite. The string of kite makes an angle of with the ground. If length of the kite is , then length of string is

(a)

(b)

(c)

(d)

**Answer:**

(b)

**Question 20**:

Line joining an eye and the object to be viewed is called

(a) Horizontal

(b) line of sight

(c) Vertical line

(d) None of these

**Answer:**

(b) Line of sight

## 2 Mark Questions

**Question1:**

A circus artist is climbing a long rope, which is tightly stretched and tied from the top of a vertical pole to the ground. Find the height of the pole, if the angle made by the rope with the ground level is (see figure).

**Answer:**

In right triangle ABC,

Hence, the height of the pole is .