Mathematics
Directions : A TV tower stands vertically on the bank of a canal. From a point on the other bank directly opposite the tower, the angle of elevation of the top of the tower is 60°. From another point 20 m away from this point on the line joining this point to the foot of the tower, the angle of elevation of the top of the tower is 30°. Based on this information, answer the following questions: 38\.The height of the tower is: (a) 10 m (b) m (c) 20 m (d) m 39\.The width of the canal is: (a) 10 m (b) m (c) 20 m (d) m 40\.The straight line distances of the top of the tower from the two points of observation differ by: (a) 7.32 m (b) 14.64 m (c) 17.32 m (d) 20.64 m 41\.How far away from the other bank must the point of observation be, so that the angle of elevation of the top of the tower is 45°? (a) 7.32 m (b) 10 m (c) 14.64 m (d) 27.32 m
Related Questions
Assertion (A): At some time of the day, the length of the shadow of a tower is equal to its height, then the sun’s altitude is 45°.
Reason (R): The angle which the line of sight makes with the horizontal line passing through the observer’s eye, when the object is above the observer, is called the angle of elevation.
A is true, R is false
A is false, R is true
Both A and R are true
Both A and R are false
Assertion (A): When observer moves horizontally towards the base of the object, angle of elevation decreases.
Reason (R): The line joining the observer’s eye and the object is called the horizontal line.
A is true, R is false
A is false, R is true
Both A and R are true
Both A and R are false