Heights and Distances

Which of the following cannot be done with the help of theodolite in surveying?

The angle of elevation and depression are usually measured by a device called

If $AB=4 \mathrm{m}$ and $AC=8 \mathrm{m}$, then angle of elevation of $A$ as observed from $C$ is (write answer without degree symbol)

A theodolite is a precision optical instrument for measuring used to measure the speed of sound in a liquid.

If ratio of length of a vertical rod and length of its shadow is $1:\sqrt{3}$, then angle of elevation of sun is

From the top of $10 \mathrm{m}$ height tower, angle of depression at a point on earth is $30°$. Distance of point from base of tower is 

If a person is looking at the top of a tower, then the angle between the line of sight and the horizontal plane is ________.

Point $P$ is at a height of $25m$ from surface of take. The angle of elevation from point $P$ on a cloud is ${30}^o$ and angle of depression of image of cloud in water is ${60}^o$ then height of cloud from surface of take is

A flag staff of height $\left(\sqrt{3}+1\right)$ mts over a tower of height 10mt throw a shadow of $\left(\sqrt{3}-1\right)$ mts on the ground hence the elevation of sun is

A man standing on level plane observer the angle of elevation of top of a pole to be $\alpha$ . He walks a distance equal to double the height of pole and finds that the elevation is $2\alpha$ . Then $\alpha =$