Which of the following characteristic is not suitable for a fuse wire?

An MCB which cuts off the electricity supply in domestic circuit in case of short-circuiting or overloading works on the:

The bulb in the circuit shown below does not glow. Can you identify the problem? Make necessary changes in the circuit to make the bulb glow. 

Two separate sets of two cells each are shown below. Draw lines to indicate how you will connect their terminals with wires to make batteries of two cells each.

The figure given below shows four cells fixed on a wooden board. Draw lines to indicate how you will connect their terminals with wires to make a battery of four cells. 

Consider the following materials:
Copper, Tungsten, Chromium, Aluminium, Nichrome, Iron 
Which of these is used to make heating element of an electric iron?