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Q.1
Carbon electrodes are not used in
GLS lamps
Electric arc furnace
Dry cells
Cinema projectors
Q.2
Thermocouples are mainly used for the measurement of
Temperature
Resistance
Eddy currents
Coupling co-efficient
Q.3
Which of the following are non-conductors of electricity?
Non-metal solids except carbon
Air and most other gases
Pure water and liquids in general except mercury
All of the above
Q.4
Commonly used conducting materials are
Copper
Aluminium
Both A and B
Copper and silver
Platinum and gold
Q.5
Effect of moisture on the insulating materials is to
Decrease dielectric constant
Decrease dielectric strength
Decrease insulation resistance
Increase dielectric loss
All of the above
Q.6
Superconducting metal in super conducting state has relative permeability of
Zero
One
Negative
More than one
Q.7
Is the property of absorbing moisture from atmosphere.
Solubility
Viscosity
Porosity
Hygroscopicity
Q.8
_______ is an example of piezoelectric material.
Glass
Quartz
Corrundum
Neoprene
Q.9
Which of the following is the poorest conductor of electricity ?
Carbon
Steel
Silver
Aluminium
Q.10
Which of the following materials is the best conductor of electricity ?
Tungsten
Aluminium
Copper
Carbon
Q.11
Surface resistance of an insulating material is reduced due to the
Smoky and dirty atmosphere
Humidity in the atmosphere
Both A and B
Neither A nor B
Q.12
Due to which of the following fact, in India, aluminium is replacing copper ?
Aluminium is more ductile and malleable than copper
Aluminium is available in plenty, cheaper and lighter than copper
Aluminium has lower resistivity than that of copper
Aluminium has less temperature co-efficient than copper
Q.13
Which of the following is an advantage of stranded conductor over equivalent single conductor ?
Less liability to kink
Greater flexibility
Less liability to break
All of the above
Q.14
The carbon percentage is least in
low carbon steel
wrought iron
cast iron
malleable iron
Q.15
Addition of 0.3 to 4.5% silicon to iron __________ the electrical resistivity of iron.
Increases
Decreases
Does not change
Change
Q.16
In a crystal, an atom vibrates at a frequency determined by
The heat content of the crystal
The temperature of the crystal
The stiffness of the bonds it makes with neighbors
All of the above
Q.17
Due to which of the following reasons copper and aluminium are not used for heating elements ?
Both have great tendency for oxidation
Both have low melting point
Very large length of wires will be required
All of the above
Q.18
A carbon resistor contains
Carbon crystals
Solid carbon granules
Pulverized coal
Finely divided carbon black.
Q.19
The conductivity of an extrinsic semiconductor with temperature
Decreases
Increases
Remains constant
All of the above
Q.20
The conductivity of a metal is determined by
The electronic concentration and the mobility of the free electrons
The number of valence electrons per atom
Either A or B
None of the above
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