The carbon percentage is least in
malleable iron
wrought iron
low carbon steel
cast iron
wrought iron
Which of the following materials is the best conductor of electricity ?
Copper
Tungsten
Aluminium
Carbon
Copper
Thermocouples are mainly used for the measurement of
coupling co-efficient
eddy currents
resistance
temperature
temperature
_____ is a hard solder.
Tin-lead
Tin-silver-lead
Copper-zinc
None of the above
Copper-zinc
Addition of 0.3 to 4.5% silicon to iron _____ the electrical resistivity of iron.
increases
None of the above
does not change
decreases
increases
Super conductivity can be destroyed by
application of magnetic field
reducing temperatures
adding impurities
any of the above
application of magnetic field
The converse of hardness is known as
none of the above
softness
malleability
toughness
softness
On which of the following factors does the resistivity of a material depend ?
All of the above
Resistance of the conductor
Area of the conductor section
Length of the conductor
All of the above
is a negatively charged particle present in an atom.
None of the above
Neutron
Proton
Electron
Electron
The formula ____ determines the number of electrons that can be accommodated in any level.
4n2
2n3
2n2
4ns
2n2
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