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Objective Questions

Latest Bihar COMFED Junior Technician Exam Question (Objective Questions), MCQ in English

Subjects : Electrical, General Awareness, English Language, Logical Reasoning, Quantitative Aptitude

Question Bank Bihar COMFED Junior Technician Exam (Electrical) - English
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Electrical

Question 1Single Answer
Assuming both the voltage sources are in phase, the value of R for which maximum power is transferred from circuit A to circuit B is
  1. A
    0.8 Ω
  2. B
    1.4 Ω
  3. C
    2 Ω
  4. D
    2.8 Ω
Question 2Single Answer
For the intrinsic gallium-arsenide, the conductivity at room temperature 25°C is 10-6 (ohm-m)-1, the electron and hole nobilities are 0.85 m2/V-s and 0.04 m2/V-s respectively. What is the intrinsic carrier concentration at the room temperature?
  1. A
    7.0 × 1012 m-3
  2. B
    7.0 × 10-12 m-3
  3. C
    7.0 × 10-12 m3
  4. D
    7.0 × 1012 m3
Question 3Single Answer
The resistivity of intrinsic germanium at 30°C is 0.46 –m. What is the intrinsic carrier density at 30°C if the electron mobility is 0.38 m2/V-s and the hole mobility is 0.18 m2/V-s?
  1. A
    9.2 × 105/m3
  2. B
    2.77 × 103/m3
  3. C
    2.43 × 1019/m3
  4. D
    8.9 × 1012/m3
Question 4Single Answer
Heat conduction in a semiconductor takes place
  1. A
    By the mobility of the carriers
  2. B
    Due to energy gap between conduction band and valency band
  3. C
    By the holes and thermal vibrations of atoms
  4. D
    By the electrons and thermal vibrations of atoms
Question 5Single Answer
Brewster angle is the angle when a wave is incident on the surface of a perfect dielectric at which there is no reflected wave and the incident wave is
  1. A
    Parallel polarized
  2. B
    Perpendicularly polarized
  3. C
    Normally polarized
  4. D
    None of the above
Question 6Single Answer
An electrical breakdown of a p-n junction occurs if
  1. A
    Forward voltage increases up to the rating
  2. B
    Reverse voltage increases beyond the rating
  3. C
    Forward voltage decreases below the rating
  4. D
    Reverse voltage decreases below the rating
Question 7Single Answer
The chief deterrent to the widespread application of superconducting materials is
  1. A
    Very difficult to form, machine or case
  2. B
    The difficult in attaining and maintaining extremely low temperature
  3. C
    The poor strength-to-weight ratio
  4. D
    The lower oxidation rate at elevated temperatures
Question 8Single Answer
Which one of the following properties is not observed in the carbon nanotubes ?
  1. A
    High stiffness and strengths
  2. B
    Low densities
  3. C
    Unusual electrical property
  4. D
    Non-ductile
Question 9Single Answer
The evidence for the importance of electron-phonon interaction in super-conductors comes from
  1. A
    Meissner effect
  2. B
    Josephson effect
  3. C
    Isotope effect
  4. D
    x quantization experiments
Question 10Single Answer
Which one of the following materials is used for cable insulation ?
  1. A
    Phenol formaldehyde
  2. B
    Polytetrafluoroethylene
  3. C
    Polyvinyl chloride
  4. D
    Acrylonitrile butadiene styrene
Question 11Single Answer
For high speed reading and storing of information in a computer, the material used is
  1. A
    Ferrite
  2. B
    Piezoelectric
  3. C
    Pyroelectric
  4. D
    Ferromagnetic above 768°C
Question 12Single Answer
The temperature above which an anti-ferromagnetic material becomes paramagnetic is called
  1. A
    Peak temperature
  2. B
    Neel temperatur
  3. C
    Critical temperature
  4. D
    Weiss temperature
Question 13Single Answer
Which effect is the converse of Peltier effect ?
  1. A
    Seeback effect
  2. B
    Thomson effect
  3. C
    Hall effect
  4. D
    Joule effect
Question 14Single Answer
Magnetic materials which may be readily magnetized in either direction are
  1. A
    Soft magnetic materials
  2. B
    Hard magnetic materials
  3. C
    High eddy current loss materials
  4. D
    High hysteresis loss materials
Question 15Single Answer
Consider the following statements regarding a ferromagnetic material:
1.Below the ferromagnetic Curie temperature, the ferromagnetic materials exhibit hysteresis effect.
2.The coercive force is the filed required to reduce the flux density to zero. 
Which of the above statements is/are correct?
  1. A
    Both 1 and 2
  2. B
    Neither 1 nor 2
  3. C
    1 only
  4. D
    2 only
Question 16Single Answer
The impact ionization phenomenon in semiconductor may be viewed as the reverse process of
  1. A
    Radiative recombination
  2. B
    Auger recombination
  3. C
    Surface recombination
  4. D
    Shockley-Read-Hall recombination
Question 17Single Answer
Refractive index of a slice glass can be reduced by doping it with tiny amount of
  1. A
    GeO2
  2. B
    B2O3
  3. C
    P2O5x
  4. D
    Al2O3
Question 18Single Answer
If a diameter of a copper wire is increased by two times keeping its terminal voltage same, then the drift velocity will
  1. A
    Become twice
  2. B
    Become half
  3. C
    ecome four times
  4. D
    Remain unchanged
Question 19Single Answer
In an induction type energy meter, the steady speed attained by the rotating disc is
1.Proportional to the deflecting torque.
2.Proportional to the resistance of the path of eddy currents.
3.Inversely proportional to the effective readings of disc from its axis.
4.Inversely proportional to the square of brake magnetic flux. 
Which of the above are correct?
  1. A
    1, 2 and 3 only
  2. B
    1, 2 and 4 only
  3. C
    2, 3 and 4 only
  4. D
    1, 2, 3 and 4
Question 20Single Answer
If ‘KCLFTSB’ stands for ‘best of  luck’ and ‘SHSWDG’ stands for ‘good wishes’, which of the following indicates ‘ace the exam’?
  1. A
    MCHTX
  2. B
    MXHTC
  3. C
    XMHCT
  4. D
    XMHTC
Question 21Single Answer
Consider  the following statements associated with the basic electrostatic properties of ideal conductors:
1.The resultant field inside is zero.
2.The net charge density in the interior is zero.
3.Any net charges reside on the surface.
4.The surface is always equipotential.
5.The field just outside is zero. 
Which of the above statements are correct?
  1. A
    1, 2, 3 and 4
  2. B
    3, 4 and 5 only
  3. C
    1, 2 and 3 only
  4. D
    2 and 3 only
Question 22Single Answer
A semiconductor device made out of a material having very high temperature coefficient of resistance is
  1. A
    Transistor
  2. B
    Varistor
  3. C
    Thyristor
  4. D
    Thermistor
Question 23Single Answer
The electrical conductivity of a semiconductor increases with increase in temperature because
  1. A
    The carrier concentration increases
  2. B
    The mobility of carrier increases
  3. C
    Both carrier concentration and mobility increases
  4. D
    The band gap decreases
Question 24Single Answer
Which of the following are associated with soft superconductors?
1.Silsbee’s rule
2.Meissner effect
3.Faraday rotation
4.Curie-Weiss law
  1. A
    2, 3 and 4
  2. B
    1 and 3 only
  3. C
    1 and 2 only
  4. D
    2 and 3 only
Question 25Single Answer
In a two-channel oscilloscope operating in x-y mode, two in-phase 50 Hz sinusoidal waveforms of equal amplitude are fed to the two channels. What will be the resultant pattern on the screen?
  1. A
    An ellipse
  2. B
    A parabola
  3. C
    Straight line inclined at 45 with respect to x-axis
  4. D
    A circle
Question 26Single Answer
Materials, whose resistivity at very low temperature plunges from a finite value to zero and remains there upon further cooling, are known as
  1. A
    Ferromagnetic materials
  2. B
    High-energy hard magnetic materials
  3. C
    Superconductors
  4. D
    Ferromagnetic materials
Question 27Single Answer
In a superconductor, is the temperature is decreased below its critical temperature, the value of critical magnetic field will
  1. A
    Increase
  2. B
    Decrease
  3. C
    Not change
  4. D
    Increase or decrease depending on the superconductor material
Question 28Single Answer
The imaginary part of dielectric constant determines
  1. A
    Component of current which is in phase with the applied field
  2. B
    Component of energy absorbed per m3
  3. C
    Amount of applied field
  4. D
    Component of voltage which is in phase with the applied field
Question 29Single Answer
Direction: Each of the items consists of two statements, one labeled as the ‘Statement (I)’ and the other as ‘Statement (II)’. Examine these two statements carefully and select the answers to these items using the codes given below
  1. A
    Statement (I):Hard magnetic materials are used for making permanent magnets.
    Statement (II):
    Hard magnetic materials have relatively small and narrow hysteresis loop.
  2. B
    Both Statement (I) and Statement (II) are individually true and Statement (II) is the correct explanation of Statement (I)
  3. C
    Both Statement (I) and Statement (II) are individually true and Statement (II) is NOT the correct explanation of Statement (I)
  4. D
    Statement (I) is true but Statement (II) is false
  5. E
    Statement (I) is false but Statement (II) is true 
Question 30Single Answer
In 8085A microprocessor, the operation performed by the instruction LHLD 2100 H is                                    
  1. A
    (H) ← 21 H, (L) ←00 
  2. B
    (H) ← M (2100 H), (L) ←M(2101H)
  3. C
    (H) ← M (2100 H), (L) ←M(2100H)
  4. D
    (H) ← 00H, (L) ←21H                                                 
Question 31Single Answer
If the magnetic susceptibility of a specimen is small and positive, the specimen is
  1. A
    Diamagnetic
  2. B
    Paramagnetic
  3. C
    Ferromagnetic
  4. D
    Non-magnetic
Question 32Single Answer
Manganese ferrite is a 1 : 1 mixture of
  1. A
    Manganese nitride and iron oxide
  2. B
    Manganese oxide and iron nitride
  3. C
    Manganese nitride and iron sulphide
  4. D
    Manganese oxide and iron sulphide 
Question 33Single Answer
When a ferromagnetic substance is magnetized, small changes in dimensions occur. Such a phenomenon is known as
  1. A
    Magnetic hysteresis
  2. B
    Magnetic expansion
  3. C
    Magnetostriction
  4. D
    Magneto-calorisation
Question 34Single Answer
In ferromagnetic , anti-ferromagnetic and ferromagnetic materials, the atomic thermal motions counteract the coupling forces between the adjacent atomic dipole moments, thereby causing
  1. A
    Some dipole misalignment regardless of whether an external field is present
  2. B
    Increase in dipole alignment regardless of whether an external field is present
  3. C
    No effect on dipole alignment
  4. D
    Atoms tend to de-randomize the direction of moments 
Question 35Single Answer
The Hall effect voltage in intrinsic silicon
  1. A
    Is positive
  2. B
    Is zero
  3. C
    Is negative
  4. D
    Changes its sign based on application of magnetic field
Question 36Single Answer
Most outstanding property of indium antimonide is
  1. A
    A very wide range gap
  2. B
    High resistivity at room temperature
  3. C
    High carrier mobility
  4. D
    Very low conductivity at room temperature
Question 37Single Answer
Which of the following semiconducting compounds is used in photoconductive devices?
  1. A
    Caesium antimonide
  2. B
    Barium oxide
  3. C
    Lead sulphide
  4. D
    Zinc oxide
Question 38Single Answer
Consider the following transducers:
1.LVDT
2.Piezoelectric
3.Thermocouple
4.Photovoltaic cell
Which of the above are active transducers?
  1. A
    1, 2 and 3
  2. B
    1, 2 and 4
  3. C
    2 and 3 only
  4. D
    2, 3 and 4
Question 39Single Answer
Consider the following statements regarding magnetic materials:
1.A diamagnetic material has no permanent dipole
2.Paramagnetic material has anti-parallel orientation of equal moments with neighboring dipoles
3.Ferrimagnetic material has anti parallel orientation of unequal moments between neighboring dipoles
4.Anti-ferromagnetic material has negligible interaction between neighboring dipoles 
Which of these statements are correct?
  1. A
    1 and 2
  2. B
    3 and 4
  3. C
    2 and 4
  4. D
    1 and 3 
Question 40Single Answer
Consider  the following statements regarding hysteresis loops of hard and soft magnetic materials:
1.Hysteresis loss of hard magnetic material will be less than that of soft material
2.Coercivity of hard materials will be greater than that of soft material
3.Retentivity of the two materials will always be equal
Which of these statements are correct?
  1. A
    1, 2 and 3
  2. B
    2 only
  3. C
    3 only
  4. D
    1 and 3 only 

General Awareness

Question 41Single Answer
Yojna a weekly journal
  1. A
    Ministry of Finance        
  2. B
    Ministry of Information and Broadcastin
  3. C
    Ministry of Rural Development
  4. D
    Planning Commission
Question 42Single Answer
Kurukshetra a journal on rural development is published by
  1. A
    Ministry of Finance 
  2. B
    Ministry of Information and Broadcastin
  3. C
    Ministry of Rural Development
  4. D
    Planning Commission
Question 43Single Answer
Devaluation of a currency means
  1. A
    Fixing the value of the currency in conjuction with the movement in the value of a basket of predetermined currencies
  2. B
    Reduction in the value of a currency vis-à-vis major internationally traded currencies
  3. C
    Fixing the value of currency in multilateral consultaion with the IMF the World Bank and major trading partners
  4. D
    Permitting the currency to seek its worth in the international market
Question 44Single Answer
In India rural incomes are generally lower than the urban incomes, which of the following reasons account for this
            1. a large number of farmers are illiterate and know little about scientific agriculture
            2. prices of primary products are lower than those of manufactured products
            3. Investments in agriculture has been low when compared to investment in industry
  1. A
    1 and 3
  2. B
    2 and 3
  3. C
    1 and 2
  4. D
    1,2 and 3
Question 45Single Answer
Which of the following programmes aims at the promotion of savings among rural women
  1. A
    Rashtriya Mahila Kosh
  2. B
    Indira Mahila Yojna
  3. C
    Jawahar Rozgar Yojna
  4. D
    Mahila Samridhi Yojna
Question 46Single Answer
What is Net National Product
  1. A
    the money value of final goods and services produced annually in the economy
  2. B
    the money value of annual service generation in the economy
  3. C
    the money value of tangible goods produced annually in the economy
  4. D
    The money value of tangible goods available in the economy
Question 47Single Answer
National income is the 
  1. A
    net national product at market price
  2. B
    net national product at factor cost
  3. C
    net domestic product at market price
  4. D
    net domestic product at factor cost
Question 48Single Answer
Chelliah Committee of 1992 deals with the overhauling of our
  1. A
    financial system            
  2. B
    tax system
  3. C
    patents and copyrights  
  4. D
    Public sector undertakings
Question 49Single Answer
During which Five Year Plan was the annual growth rate of National Income the lowest
  1. A
    2nd plan
  2. B
    3rd plan
  3. C
    5th plan
  4. D
    6th plan
Question 50Single Answer
Which of the following taxes is a progressive tax
  1. A
    sales tax           
  2. B
    custom tax
  3. C
    excise tax         
  4. D
    income tax
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