Waves — Physics STD 11 Science — Question

Answer the following : The triple-point of water is a standard fixed point in modern thermometry. Why? What is wrong in taking the melting point of ice and the boiling point of water as standard fixed points (as was originally done in the Celsius scale)?

Can the pressure of a gas be changed by keeping both its temperature and volume constant?

When air is blown in between two balls suspended close to each other, they are attracted towards each other. Give reason.

The wheels of moving vehicles are made hollow in the middle and thick on the circumference, why?

What is the source of kinetic energy of the bullet coming out of the bullet of a rifle?

Give the dimensional formula of 'g' and 'G'.

A long solenoid is fabricated by closely winding a wire of radius 0.5mm over a cylindrical nonmagnetic frame so that the successive turns nearly touch each other. What would be the magnetic field B at the centre of the solenoid if it carries a current of 5A?

Name the forces which have shortest range and the longest range.

Which harmonics are absent in a closed organ pipe?