Why wood is non-conductor of electricity?
a) it has high melting point
b) it is non-metal
c) it is malleable and sonorous
d) all of these
Why metals are good conductor of heat?
a) they have high melting point
b) they have free electrons
c) they are ductile
d) they are sonorous
When electricity is passed through metals, which of the following begins to flow?
a) electrons
b) protons
c) neutrons
d) nucleus
Which one of the following is good conductor of heat and is used in wires?
a) silicon
b) carbon
c) copper
d) diamond
Why electrical cables are covered with plastic?
a) plastic is malleable
b) plastic has low melting point
c) plastic is non-conductor
d) none of these
Materials which do notpass electricity are called
a) conductors
b) insulators
c) ductile
d) sonorous
