The diagram shows a simple mercury barometer. The mercury level is at a height $h$ when the atmospheric pressure is $100000 \mathrm{Pa}$. What is the pressure at $P$?

 

In the given figure, a beaker is filled with water. $A, B$ and $C$ are three holes in beaker, which of the following statements is correct regarding this?

What will happen if there is a vacuum just above one limb of the U-tube half filled with liquid as shown in figure?

In the given diagram, when a weight of $100 \mathrm{g}$ is hung from the spring, its length is $9 \mathrm{cm}$. When a weight of $150 \mathrm{g}$ is hung from it, its length is $11 \mathrm{cm}$. What is the length of the spring when there is no weight hanging from it?

Jay and Puneet go to the amusement park to play the pin ball game. The figure shows the extent to which each of them pulls the striker. Which one of the following statements is correct?

A boy set up an experiment as shown in the diagram. As he slides the magnet across the wooden board, the ball bearing followed the magnet's movement and direction. What does the experiment show?

(i) Magnetic force can be seen due to friction between ball bearing and wooden board.
(ii) Friction and gravity help to move the ball bearing.
(iii) The ball bearing is made of a magnetic substance.
(iv) Magnetic force can pass through the wooden board.