Choose the BEST answer from the four options A, B, C, or D: Due to which property of LPG are we asked to close the valve of the gas cylinder, in the kitchen in our homes? A. It is inflammable B. It is a liquid C. It has a bad smell D. It is a mixture

A

Explanation:

We are usually asked to close the valve of the gas cylinder in our various kitchens at home due to the inflammable property of the Liquified Petroleum Gas.

Without closing the valve, the LPG would diffuse into our homes, and any form of spark would cause an explosion and lead to a fire. Lives and properties could be lost in the process.

The correct option is A.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.