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Q.1
Due to which of the following reasons aluminium does not corrode in atmosphere ?
Aluminium is a noble metal
Atmospheric oxygen can only diffuse very slowly through the oxide layer which is formed on the surface of aluminium
No reaction with oxygen occurs ft Any of the above
All of the above
Q.2
Which of the following high resistance materials has the highest operating temperature ?
Kanthal
Manganin
Nichrome
Eureka
Q.3
Which of the following material is not a semiconductor ?
Silica
Germanium
Selenium
Gallium-arsenide
Q.4
Steel wire is used as
Overhead telephone wire
Earth wire
Core wire of ACSR
All of the above
Q.5
In thermocouples which of the following pairs is commonly used ?
Copper-constantan
Aluminium-tin
Silver-German silver
Iron-steel
Q.6
The transition temperature of mercury is
18.0°K
9.22°K
4.12°K
1.14’K
Q.7
Which of the following materials is preferred for transmitting electrical energy over long distance ?
Copper
Aluminium
Steel reinforced copper
Steel reinforced aluminium
Q.8
If the resistance of a conductor does not vary in accordance with Ohm’s law it is known as
non-linear conductor
reverse conductor
bad-conductor
non-conductor
Q.9
The forbidden gap in an insulator is
Large
Small
Nil
Any of the above
Q.10
Platinum is used in
Electrical contacts
Thermocouple
Heating element in high temperature furnace
Grids of special purpose vacuum tubes
All of the above
Q.11
At transition temperature the value of critical field is
Zero
Negative real value
Positive real value
Complex value
Q.12
The covalent bond is formed by
Transfer of electrons between atoms
Sharing of electrons between atoms
Sharing of variable number of electrons by a variable number of atoms
None of the above
Q.13
The formula __________ determines the number of electrons that can be accommodated in any level.
2n2
4n2
2n3
4ns
Q.14
The superconductivity is due to
The crystal structure having no atomic vibration at 0°K
All electrons interact in the super-conducting state
The electrons jump into nucleus at 0°K
None of the above
Q.15
Overhead telephone wires are made of
aluminium
steel
ACSR conductors
Copper
Q.16
Solder is an alloy of
Copper and aluminium
Tin and lead
Nickel, Copper and zinc
Silver, copper and lead
Q.17
_________ is most commonly used for making magnetic recording tape
Silver nitrate
Ferric oxide
Small particles of iron
Silicon-iron
Q.18
A good electric contact material should have all of the following properties except
High resistivity
High resistance to corrosion
Good thermal conductivity
High melting point
Q.19
Carbon resistors are used extensively because they are
Easy to make
Compact
Inexpensive
All of the above reasons
Q.20
The current due to electron flow in conduction band is the hole current in valence band.
Equal to
Less than
Greater than
Any of the above
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