Magnetic Effect of Current — Physics STD 10 — Question

Why do echoes produced in an empty auditorium usually decrease when it is full of audience?

Of the three connecting wires in a household circuit: Which two of the three wires are at the same potential? In which of the three wires should the switch be connected?

Why is the work done on an object moving along a circular path zero?

In the following cases, where must an object be placed in front of a convex lens so that the image formed is upright and enlarged image?

Name four colours of the spectrum of white light which have wavelength longer than blue light.

State whether a magnetic field is associated or not around a moving charge.

Write the names of all the components of electromagnetic spectrum in the order of increasing frequency.

What is absolute zero?

When you move upstairs, do you perform some work?