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Objective Questions

Latest ISRO URSC Technician B Exam Question (Objective Questions), MCQ in English

Subjects : Concerned Subject (Electronics Mechanic)

Question Bank ISRO URSC Technician B (Electronics Mechanic) Exam - English
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Concerned Subject (Electronics Mechanic)

Question 1Single Answer
The basic unit of electric current in the SI system is:
  1. A
    Ampere
  2. B
    Volt
  3. C
    Ohm
  4. D
    Watt
Question 2Single Answer
The flow of electric charge through a conductor is called:
  1. A
    Electric current
  2. B
    Capacitance
  3. C
    Resistance
  4. D
    Inductance
Question 3Single Answer
The negatively charged particle in an atom is:
  1. A
    Neutron
  2. B
    Proton
  3. C
    Electron
  4. D
    Nucleus
Question 4Single Answer
The SI unit of electrical resistance is:
  1. A
    Farad
  2. B
    Henry
  3. C
    Tesla
  4. D
    Ohm
Question 5Single Answer
A material that allows electric current to flow easily is called:
  1. A
    Conductor
  2. B
    Insulator
  3. C
    Dielectric
  4. D
    Semiconductor
Question 6Single Answer
Copper is commonly used for electrical wiring because it has:
  1. A
    High resistance
  2. B
    Low melting point
  3. C
    Low resistivity
  4. D
    High magnetic permeability
Question 7Single Answer
The unit of electric potential difference is:
  1. A
    Volt
  2. B
    Ampere
  3. C
    Watt
  4. D
    Joule
Question 8Single Answer
The nucleus of an atom contains:
  1. A
    Electrons and protons
  2. B
    Protons and neutrons
  3. C
    Only electrons
  4. D
    Electrons and neutrons
Question 9Single Answer
The total number of protons in an atom determines its:
  1. A
    Mass number
  2. B
    Electrical resistance
  3. C
    Valency
  4. D
    Atomic number
Question 10Single Answer
An electrical insulator generally has:
  1. A
    Very low resistivity
  2. B
    Very high resistivity
  3. C
    Zero resistance
  4. D
    High conductivity
Question 11Single Answer
Ohm's law is expressed as:
  1. A
    Q = It
  2. B
    P = VI
  3. C
    V = IR
  4. D
    E = Pt
Question 12Single Answer
A resistor of 6 ohms carries 2 amperes. The voltage across it is:
  1. A
    12 V
  2. B
    8 V
  3. C
    10 V
  4. D
    3 V
Question 13Single Answer
The amount of charge flowing through a conductor per second is:
  1. A
    Electric current
  2. B
    Electric power
  3. C
    Electric energy
  4. D
    Electric resistance
Question 14Single Answer
One ampere is equal to:
  1. A
    One volt per second
  2. B
    One coulomb per second
  3. C
    One watt per second
  4. D
    One joule per second
Question 15Single Answer
The unit of electrical conductance is:
  1. A
    Ohm
  2. B
    Siemens
  3. C
    Farad
  4. D
    Weber
Question 16Single Answer
The reciprocal of resistance is:
  1. A
    Inductance
  2. B
    Conductance
  3. C
    Reactance
  4. D
    Capacitance
Question 17Single Answer
A 12 V supply connected across a 4-ohm resistor produces a current of:
  1. A
    2 A
  2. B
    3 A
  3. C
    4 A
  4. D
    6 A
Question 18Single Answer
The resistance of a conductor depends on its:
  1. A
    Colour only
  2. B
    Length, cross-sectional area and material
  3. C
    Shape only
  4. D
    Weight only
Question 19Single Answer
Increasing the length of a uniform wire while keeping its cross-sectional area constant will:
  1. A
    Increase its resistance
  2. B
    Decrease its resistance
  3. C
    Make its resistance zero
  4. D
    Reverse the current direction
Question 20Single Answer
The resistance of a uniform conductor is inversely proportional to its:
  1. A
    Length
  2. B
    Cross-sectional area
  3. C
    Resistivity
  4. D
    Temperature only
Question 21Single Answer
The formula for resistance of a uniform conductor is:
  1. A
    R = ρA/L
  2. B
    R = ρL/A
  3. C
    R = LA/ρ
  4. D
    R = ρLA
Question 22Single Answer
The SI unit of resistivity is:
  1. A
    Ohm per metre
  2. B
    Siemens per metre
  3. C
    Ohm-metre
  4. D
    Ampere-metre
Question 23Single Answer
Electrical power in a DC circuit is calculated by:
  1. A
    P = I/V
  2. B
    P = V/I
  3. C
    P = R/I
  4. D
    P = VI
Question 24Single Answer
A device operating at 10 V and drawing 2 A consumes:
  1. A
    5 W
  2. B
    10 W
  3. C
    20 W
  4. D
    12 W
Question 25Single Answer
The SI unit of energy is:
  1. A
    Watt
  2. B
    Joule
  3. C
    Volt
  4. D
    Ampere
Question 26Single Answer
The commercial unit of electrical energy is:
  1. A
    Kilowatt-hour
  2. B
    Joule per second
  3. C
    Watt
  4. D
    Ampere-hour
Question 27Single Answer
One kilowatt-hour is equal to:
  1. A
    360 joules
  2. B
    3.6 Γ— 10^6 joules
  3. C
    3600 joules
  4. D
    36,000 joules
Question 28Single Answer
A 100 W lamp operates for 10 hours. Its energy consumption is:
  1. A
    1 kWh
  2. B
    500 Wh
  3. C
    10 kWh
  4. D
    100 Wh
Question 29Single Answer
Electrical efficiency is generally expressed as:
  1. A
    Input/Output Γ— 100
  2. B
    Losses/Input Γ— 100
  3. C
    Output/Input Γ— 100
  4. D
    Voltage/Current Γ— 100
Question 30Single Answer
An electrical device takes 200 W input and delivers 160 W useful output. Its efficiency is:
  1. A
    60%
  2. B
    70%
  3. C
    90%
  4. D
    80%
Question 31Single Answer
In conventional current flow, the current direction is considered from:
  1. A
    Positive terminal to negative terminal
  2. B
    Negative terminal to positive terminal
  3. C
    Earth to positive terminal
  4. D
    Neutral to earth
Question 32Single Answer
Electron flow in a metallic conductor is opposite to:
  1. A
    Magnetic flux
  2. B
    Electric resistance
  3. C
    Conventional current
  4. D
    Voltage magnitude
Question 33Single Answer
A conductor contains a large number of:
  1. A
    Bound neutrons
  2. B
    Free protons
  3. C
    Free electrons
  4. D
    Positive nuclei in motion
Question 34Single Answer
A common semiconductor material used in electronic devices is:
  1. A
    Silicon
  2. B
    Glass
  3. C
    Copper
  4. D
    Rubber
Question 35Single Answer
The electrical conductivity of an intrinsic semiconductor generally:
  1. A
    Remains constant at every temperature
  2. B
    Decreases to zero with increasing temperature
  3. C
    Increases with increasing temperature
  4. D
    Is always equal to copper
Question 36Single Answer
A good electrical insulating material is:
  1. A
    Mica
  2. B
    Silver
  3. C
    Copper
  4. D
    Aluminium
Question 37Single Answer
The SI prefix milli represents:
  1. A
    10^-3
  2. B
    10^-6
  3. C
    10^3
  4. D
    10^6
Question 38Single Answer
One microampere is equal to:
  1. A
    10^-3 A
  2. B
    10^3 A
  3. C
    10^-6 A
  4. D
    10^-9 A
Question 39Single Answer
A resistance of 4.7 kilo-ohms is equal to:
  1. A
    470 ohms
  2. B
    4700 ohms
  3. C
    47 ohms
  4. D
    47,000 ohms
Question 40Single Answer
One megohm is equal to:
  1. A
    100 ohms
  2. B
    1000 ohms
  3. C
    1,000,000 ohms
  4. D
    10,000 ohms
Question 41Single Answer
Electromotive force is measured in:
  1. A
    Watts
  2. B
    Amperes
  3. C
    Volts
  4. D
    Coulombs
Question 42Single Answer
The work done per unit charge in moving a charge between two points is:
  1. A
    Current
  2. B
    Resistance
  3. C
    Conductance
  4. D
    Potential difference
Question 43Single Answer
A source of direct electrical energy commonly used in portable electronic devices is:
  1. A
    Inductor
  2. B
    Transformer
  3. C
    Battery
  4. D
    Capacitor only
Question 44Single Answer
A primary cell is one that is generally:
  1. A
    Rechargeable
  2. B
    Used only for AC circuits
  3. C
    Connected only in parallel
  4. D
    Not designed for recharging
Question 45Single Answer
A common rechargeable electrochemical cell type is:
  1. A
    Zinc-carbon primary cell
  2. B
    Alkaline primary cell
  3. C
    Lithium-ion cell
  4. D
    Silver-oxide primary button cell
Question 46Single Answer
The nominal voltage of one lead-acid cell is approximately:
  1. A
    2 V
  2. B
    1.5 V
  3. C
    1 V
  4. D
    3.7 V
Question 47Single Answer
The nominal voltage of a typical lithium-ion cell is approximately:
  1. A
    1.2 V
  2. B
    3.7 V
  3. C
    2.0 V
  4. D
    6.0 V
Question 48Single Answer
Connecting identical battery cells in series primarily increases:
  1. A
    Internal chemical capacity in Ah
  2. B
    Frequency
  3. C
    Current rating of each individual cell
  4. D
    Total output voltage
Question 49Single Answer
Four ideal 1.5 V cells connected in series provide:
  1. A
    6 V
  2. B
    1.5 V
  3. C
    3 V
  4. D
    9 V
Question 50Single Answer
Connecting identical cells in parallel, with correct polarity, primarily increases:
  1. A
    Nominal output voltage
  2. B
    AC frequency
  3. C
    Available ampere-hour capacity
  4. D
    Electromagnetic frequency
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