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Objective Questions

Latest BSNL JTO Exam Question (Objective Questions), MCQ in English

Subjects : Engineering Stream (Section-I), Engineering Stream (Section-II), Ability test

Question Bank BSNL Junior Telecom Officer Exam - English
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Engineering Stream (Section-I)

Question 1Single Answer
The atomic structure of a conductor is characterized by?
  1. A
    Large forbidden energy gap
  2. B
    High resistivity
  3. C
    No free electrons
  4. D
    Overlapping valence and conduction bands
Question 2Single Answer
Which material has very high electrical conductivity?
  1. A
    Glass
  2. B
    Rubber
  3. C
    Mica
  4. D
    Copper
Question 3Single Answer
The forbidden energy gap of a semiconductor is approximately?
  1. A
    0 eV
  2. B
    20 eV
  3. C
    10 eV
  4. D
    1 eV
Question 4Single Answer
Silicon is classified as?
  1. A
    Conductor
  2. B
    Insulator
  3. C
    Semiconductor
  4. D
    Superconductor
Question 5Single Answer
Which semiconductor material is commonly used in IC fabrication?
  1. A
    Germanium
  2. B
    Copper
  3. C
    Silicon
  4. D
    Iron
Question 6Single Answer
An insulator has?
  1. A
    Very high resistance
  2. B
    Low resistivity
  3. C
    Many free electrons
  4. D
    Overlapping energy bands
Question 7Single Answer
Which of the following is an insulating material?
  1. A
    Aluminum
  2. B
    Glass
  3. C
    Copper
  4. D
    Silver
Question 8Single Answer
The conductivity of a semiconductor increases with?
  1. A
    Decrease in temperature
  2. B
    Increase in temperature
  3. C
    Constant temperature
  4. D
    Cooling to absolute zero
Question 9Single Answer
Doping in semiconductors is done to?
  1. A
    Increase resistance
  2. B
    Decrease conductivity
  3. C
    Increase weight
  4. D
    Modify conductivity
Question 10Single Answer
A pentavalent impurity added to silicon produces?
  1. A
    Intrinsic semiconductor
  2. B
    P-type semiconductor
  3. C
    N-type semiconductor
  4. D
    Insulator
Question 11Single Answer
Boron is used to create?
  1. A
    Intrinsic semiconductor
  2. B
    N-type semiconductor
  3. C
    P-type semiconductor
  4. D
    Superconductor
Question 12Single Answer
The majority charge carriers in N-type semiconductor are?
  1. A
    Holes
  2. B
    Electrons
  3. C
    Protons
  4. D
    Ions
Question 13Single Answer
The majority charge carriers in P-type semiconductor are?
  1. A
    Electrons
  2. B
    Holes
  3. C
    Neutrons
  4. D
    Photons
Question 14Single Answer
Which material is used for magnetic cores in transformers?
  1. A
    Plastic
  2. B
    Glass
  3. C
    Ferrite
  4. D
    Rubber
Question 15Single Answer
Ferrites are mainly used because of?
  1. A
    High conductivity
  2. B
    High thermal expansion
  3. C
    High optical transparency
  4. D
    Low hysteresis loss
Question 16Single Answer
Superconductors exhibit?
  1. A
    Infinite resistance
  2. B
    High dielectric constant
  3. C
    Zero resistance
  4. D
    Negative conductivity
Question 17Single Answer
The temperature below which a material becomes superconducting is called?
  1. A
    Critical temperature
  2. B
    Curie temperature
  3. C
    Room temperature
  4. D
    Melting temperature
Question 18Single Answer
Piezoelectric materials generate?
  1. A
    Heat from light
  2. B
    Resistance from current
  3. C
    Magnetism from heat
  4. D
    Voltage from mechanical stress
Question 19Single Answer
Quartz crystal works on which effect?
  1. A
    Piezoelectric effect
  2. B
    Hall effect
  3. C
    Thermoelectric effect
  4. D
    Photoelectric effect
Question 20Single Answer
Ceramic materials are generally?
  1. A
    Good conductors
  2. B
    Superconductors
  3. C
    Insulators
  4. D
    Magnetic conductors
Question 21Single Answer
Ferroelectric materials exhibit?
  1. A
    Permanent magnetic field only
  2. B
    Permanent electric polarization
  3. C
    Zero conductivity
  4. D
    Infinite resistance
Question 22Single Answer
The SI unit of resistance is?
  1. A
    Ohm
  2. B
    Farad
  3. C
    Henry
  4. D
    Tesla
Question 23Single Answer
Carbon composition resistors are generally used for?
  1. A
    High precision applications
  2. B
    Microwave generation
  3. C
    General purpose applications
  4. D
    High power transmission
Question 24Single Answer
Which resistor has very high stability and accuracy?
  1. A
    Carbon resistor
  2. B
    Wire wound resistor
  3. C
    LDR
  4. D
    Film resistor
Question 25Single Answer
A variable resistor is called?
  1. A
    Capacitor
  2. B
    Transformer
  3. C
    Potentiometer
  4. D
    Relay
Question 26Single Answer
The SI unit of capacitance is?
  1. A
    Henry
  2. B
    Coulomb
  3. C
    Tesla
  4. D
    Farad
Question 27Single Answer
A capacitor stores energy in the form of?
  1. A
    Electric field
  2. B
    Magnetic field
  3. C
    Heat energy
  4. D
    Mechanical energy
Question 28Single Answer
The dielectric material in a capacitor is used to?
  1. A
    Increase current
  2. B
    Reduce resistance
  3. C
    Increase capacitance
  4. D
    Produce heat
Question 29Single Answer
Electrolytic capacitors are generally used in?
  1. A
    Power supply filters
  2. B
    High frequency tuning
  3. C
    Oscillators only
  4. D
    Antennas
Question 30Single Answer
Which capacitor has polarity?
  1. A
    Ceramic capacitor
  2. B
    Electrolytic capacitor
  3. C
    Air capacitor
  4. D
    Mica capacitor
Question 31Single Answer
The SI unit of inductance is?
  1. A
    Farad
  2. B
    Henry
  3. C
    Weber
  4. D
    Tesla
Question 32Single Answer
An inductor stores energy in the form of?
  1. A
    Magnetic field
  2. B
    Electric field
  3. C
    Heat energy
  4. D
    Light energy
Question 33Single Answer
The opposition offered by an inductor to change in current is called?
  1. A
    Resistance
  2. B
    Conductance
  3. C
    Reactance
  4. D
    Admittance
Question 34Single Answer
Which component is widely used in tuning circuits?
  1. A
    Fuse
  2. B
    Relay
  3. C
    LC circuit
  4. D
    Transformer core
Question 35Single Answer
Air core inductors are mainly used at?
  1. A
    Audio frequencies
  2. B
    High frequencies
  3. C
    Low frequencies
  4. D
    DC circuits only
Question 36Single Answer
Ferrite core inductors are preferred because they?
  1. A
    Increase losses
  2. B
    Reduce inductance
  3. C
    Provide high permeability
  4. D
    Decrease resistance
Question 37Single Answer
Quartz crystal is mainly used for?
  1. A
    Voltage amplification
  2. B
    Frequency stabilization
  3. C
    Rectification
  4. D
    Power transmission
Question 38Single Answer
The frequency stability of quartz crystal is?
  1. A
    Very high
  2. B
    Moderate
  3. C
    Poor
  4. D
    Zero
Question 39Single Answer
Ceramic resonators are mainly used in?
  1. A
    Frequency control circuits
  2. B
    High power transformers
  3. C
    DC motors
  4. D
    Loudspeakers
Question 40Single Answer
Which component converts electrical energy into mechanical motion?
  1. A
    Capacitor
  2. B
    Inductor
  3. C
    Transformer
  4. D
    Relay
Question 41Single Answer
A relay is basically an?
  1. A
    Oscillator
  2. B
    Semiconductor device
  3. C
    Passive filter
  4. D
    Electromechanical switch
Question 42Single Answer
Electromagnetic relays operate on?
  1. A
    Electrostatic force
  2. B
    Thermal effect
  3. C
    Piezoelectric effect
  4. D
    Magnetic effect of current
Question 43Single Answer
Which material is commonly used for resistor fabrication?
  1. A
    Mica
  2. B
    Silicon
  3. C
    Copper sulfate
  4. D
    Carbon
Question 44Single Answer
The temperature coefficient of resistance for conductors is generally?
  1. A
    Negative
  2. B
    Zero
  3. C
    Infinite
  4. D
    Positive
Question 45Single Answer
The temperature coefficient of resistance for semiconductors is generally?
  1. A
    Negative
  2. B
    Infinite
  3. C
    Positive
  4. D
    Zero
Question 46Single Answer
Which material is widely used as dielectric in ceramic capacitors?
  1. A
    Titanium dioxide
  2. B
    Copper
  3. C
    Silver
  4. D
    Aluminum
Question 47Single Answer
Mica capacitors are preferred for?
  1. A
    High stability applications
  2. B
    Low voltage DC only
  3. C
    Power transmission
  4. D
    Heating circuits
Question 48Single Answer
Wire wound resistors are mainly used in?
  1. A
    RF antennas
  2. B
    Microwave circuits
  3. C
    Optical circuits
  4. D
    High power applications
Question 49Single Answer
The main disadvantage of wire wound resistors is?
  1. A
    Low resistance
  2. B
    High accuracy
  3. C
    Inductive effect
  4. D
    Small size
Question 50Single Answer
Which of the following is a passive component?
  1. A
    Transistor
  2. B
    SCR
  3. C
    Capacitor
  4. D
    IC
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