1. What is the height of room if after entering the room with a watch ur head strikes a hanging bulb?

Oscillate the hanging bulb. Calculate the time period for one complete oscillation by Simple Harmonic Motion (SHM) of the handing bulb. Put it in the
formula T=2 * 3.14 * (L/G)^1/2

3. Can u make 120 with 5 zeros?

Factorial (factorial (0)+factorial (0)+factorial (0)+factorial (0)+factorial (0)) = 120

6. How will you recognize the magnet & magnetic material & non-magnetic material?

Drag one piece of material over another. There is no attractive force in the middle portion of the magnet. OR Get a piece of thread and tie up with the one bar and check for poles. If it iron bar then it moves freely and if it is magnetic bar then it fix in one direction according to poles.