A student suspends a barmagnet by a thread and writes the following statements in her copy :
S1 - The bar magnet comes to rest in such a position that one end points in the north and the other in the south direction
S2 - A freely suspended magnet aligns in North - South direction
Which of the following statements is/are correct ?

An electron possesses a negative charge of:

How many electrons taken together make one coulomb?

One ohm is equal to:

The kinetic energy of an object is derived using which of the following equations of motion?

A ball of mass 50 grams is moving with a velocity of 15 m/s. What is its kinetic energy?

An object is placed 15 cm in front of a convex lens of focal length 25 cm. The image distance will be

What is the process in which metals are extracted from their ores by heating beyond the melting point?