Questions

The intensity of Earthquakes is measured on Mercalli scale.

The atmospheric pressure at the surface of the Earth is due to gravitational pull of the earth and is about 14.7 psi.

That means that the weight of a column of air which has a cross section of 1 square inch and which stretches from the surface of the Earth to space is 14.7 pounds. 

PWC refers to Personal Water Crafts.

To control steering on a PWC, the most needed requirement is to have power in which will allows the one using it to control the engine for it to stop or for it to move. Without power, the person using it could be out of balance or fail to start the engine. This is the basic requirement because even though it is shut off or the engine is off, the PWC is still on and it could still move without proper knowledge of the engine.

As there is no medium inside the bell jar, sound cannot travel

HR-Human Resources:

To be a good HR person we need to have excellent  communication skills,interpersonal skills, good friendly attitude, talkative, decision-making skills etc.

An HR is the backbone of a  company. Right from recruiting the suitable person to training and then efficiency appraisal and then compensation and then exit interview...everything every step involves an HR.

So, if you wish to be a soul of the company not just a part of it, you should be an HR.