Q.1
Carbon electrodes are not used in
Q.2
Thermocouples are mainly used for the measurement of
Q.3
Which of the following are non-conductors of electricity?
Q.4
Commonly used conducting materials are
Q.5
Effect of moisture on the insulating materials is to
Q.6
Superconducting metal in super conducting state has relative permeability of
Q.7
Is the property of absorbing moisture from atmosphere.
Q.8
_______ is an example of piezoelectric material.
Q.9
Which of the following is the poorest conductor of electricity ?
Q.10
Which of the following materials is the best conductor of electricity ?
Q.11
Surface resistance of an insulating material is reduced due to the
Q.12
Due to which of the following fact, in India, aluminium is replacing copper ?
Q.13
Which of the following is an advantage of stranded conductor over equivalent single conductor ?
Q.14
The carbon percentage is least in
Q.15
Addition of 0.3 to 4.5% silicon to iron __________ the electrical resistivity of iron.
Q.16
In a crystal, an atom vibrates at a frequency determined by
Q.17
Due to which of the following reasons copper and aluminium are not used for heating elements ?
Q.18
A carbon resistor contains
Q.19
The conductivity of an extrinsic semiconductor with temperature
Q.20
The conductivity of a metal is determined by
0 h : 0 m : 1 s