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Q.1
For a hole which of the following statements is incorrect ?
Holes can exist in certain semiconductors only
Holes can exist in any material including conductors
Holes may constitute an electric current
Holes can be considered as a net positive charge
Q.2
Substances whose specific resistance abruptly decreases at very low temperature are called
Insulators
Conductors
Semiconductors
Superconductors
Q.3
The impurity atoms is semiconductors
Inject more charge carriers
Reduce the energy gap
Increase the kinetic energy of valence electrons
All of the above
Q.4
The value of critical field below the transition temperature will
Increase
Decrease
Remain unchanged
Any of the above
Q.5
Non-linear resistors
Produce harmonic distortion
Follows Ohm’s law at low temperatures only
Result in non-uniform heating
None of the above
Q.6
The metal having the lowest temperature coefficient of resistance is
Gold
Copper
Aluminium
Kanthal
Q.7
A perfect conductor has
Zero conductivity
Unity conductivity
Infinite conductivity
None of the above
Q.8
The photo-electric effect occurs only when the incident light has more than a certain critical
Intensity
Speed
Frequency
Wave length
Q.9
Carbon rods are used in wet and dry cells because
Carbon rod serves as conductor
Carbon can resist the attack of battery acid
Both A and B
Either A or B
Q.10
Is viscoelastic.
Cast-iron
Graphite
Rubber
Glass
Q.11
Which of the following factors affect resistivity of metals ?
Age hardening
Alloying
Temperature
Cold work
All of the above
Q.12
For a particular material the Hall coefficient was found to be zero. The material is
Insulator
Metal
Intrinsic semiconductor
None of the above
Q.13
A highly conductive material must have
Highest conductivity
Lowest temperature co-efficient
Good mechanical strength
Good corrosion resistance
All of the above
Q.14
__________ is the main constituent of glass
Fe203
Si02
AI2O3
B2O3
Q.15
In a superconductor the value of critical density depends upon
Magnetic field strength
Temperature
Either A or B
Both A and B
Q.16
Total number of crystal systems is
2
4
7
12
Q.17
Superconductors are becoming popular for use in
Generating very strong magnetic field
Manufacture of bubble memories
Generating electrostatic field
Generating regions free from magnetic field
Q.18
In graphite, bonding is
Covalent
Metallic
Vander Waals
Vander Waals and covalent
Q.19
The conductors have transport phenomena of electrons due to
Electric field
Magnetic field
Electromagnetic field
None of the above
Q.20
Is a negatively charged particle present in an atom.
Proton
Neutron
Electron
None of the above
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