How are such devices used in rescue operations ?

How does an arc lamp help in rescue operations ?

Which device is used to measure the relative density of a liquid?

Find the inverse of each of the matrices using elementary operations [[1 , 3],[ 2, 7]]

From given below, which device is used to measure electrical energy.

Incandescent lamp, discharge lamp , C.F.L, LED lamp, arc lamp are given for observation . Answer the following questions after observing them. Which lamp is used in rescue work during night time and used in search lights ?