Rock is a solid material composed of grains of minerals. There are many different types of rocks. However, broadly they are divided into three categories – Igneous rocks, sedimentary rocks and metamorphic...

Sensors are generally classified on the basis of entities which they detect and measure. However, commonly they are divided into active and passive types. Some of the common types of sensors are – mechanical,...

Teeth are hard organs which are situated at the oral cavity. There are four main types of teeth which are classified according to their shape and structure. They all have specific functions related to the...

Thermometers are devices used for the measurement of temperature. They are mainly of two types – electrical and non-electrical. Thermometers based on mechanisms like mercury in glass or vapor pressure fall in...

Geometrical shapes cover all basic shapes like lines, closed shapes and simple curves. Commonly shapes are divided into three categories – 1, 2 and 3 dimensional shapes.