Here are 25 MCQ questions for ITI Electrician 1st Year, curated from the provided search results. Answers and citations are included for reference ITI Electrician Theory 1st year:
Basic Electrical Concepts
- How many electrons are present in the third cell of a copper atom?
(a) 8
(b) 13
(c) 18
(d) 29
Answer: (c) 18 - Which law states that in a closed circuit, the applied voltage equals the sum of voltage drops?
(a) Ohm’s Law
(b) Kirchhoff’s First Law
(c) Kirchhoff’s Second Law
(d) Laws of Resistance
Answer: (c) Kirchhoff’s Second Law - What is the unit of resistivity?
(a) Ohm/cm
(b) Ohm-metre
(c) Ohm/cm²
(d) Ohm/metre
Answer: (b) Ohm-metre - A 500W lamp used for 5 hours consumes how many units of electrical energy?
(a) 0.5
(b) 1.0
(c) 1.5
(d) 2.5
Answer: (d) 2.5 - Which material has a negative temperature coefficient?
(a) Copper
(b) Mica
(c) Nichrome
(d) Germanium
Answer: (b) Mica
Tools and Workshop Practice
- Which plier is used to make wire hooks and loops?
(a) Long nose plier
(b) Round nose plier
(c) Diagonal cutting plier
(d) Flat nose plier
Answer: (b) Round nose plier - What is the use of a mortise chisel?
(a) General chiseling work
(b) Making rectangular holes in wood
(c) Trimming joints
(d) Cleaning sharp corners
Answer: (b) Making rectangular holes in wood - Which stake is used for sharp bends in sheet metal?
(a) Square stake
(b) Hatchet stake
(c) Blow horn stake
(d) Bevel edge square stake
Answer: (b) Hatchet stake - The length of a hacksaw blade is measured between:
(a) Inner ends of pin-holes
(b) Centers of pin-holes
(c) Outer ends of pin-holes
(d) One inner and one outer end
Answer: (b) Centers of pin-holes - Which defect in timber is caused by uneven shrinkage?
(a) Knot
(b) Twisting
(c) Cupping
(d) Cracking
Answer: (b) Twisting
Circuits and Components
- In a parallel circuit with three resistors (R1, R2, R3), the equivalent resistance formula is:
(a) ( R_T = R1 + R2 + R3 )
(b) ( R_T = \frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3} )
(c) ( R_T = \frac{1}{\frac{1}{R1} + \frac{1}{R2} + \frac{1}{R3}} )
(d) ( R_T = \frac{1}{R1 + R2 + R3} )
Answer: (c) - What happens to a conductor’s resistance if its diameter is doubled?
(a) Increases 2x
(b) Decreases 4x
(c) Decreases 2x
(d) No change
Answer: (b) Decreases 4x - The starting torque of a single-phase induction motor is:
(a) Low
(b) High
(c) Very low
(d) Zero
Answer: (a) Low - Which instrument measures insulation resistance?
(a) Voltmeter
(b) Megger
(c) Ammeter
(d) Wattmeter
Answer: (b) Megger - The unit of frequency is:
(a) Hertz
(b) Coulomb
(c) Tesla
(d) Watt
Answer: (a) Hertz
Safety and Applications
- What is “smothering” in fire extinguishing?
(a) Removing fuel
(b) Isolating oxygen
(c) Lowering temperature
(d) Adding chemicals
Answer: (b) Isolating oxygen - Which is a mandatory safety sign?
(a) Risk of electric shock
(b) Wear safety belt
(c) Smoking prohibited
(d) All of the above
Answer: (d) All of the above - A fluorescent tube may burn out if the choke is:
(a) Open-circuited
(b) Short-circuited
(c) Grounded
(d) Removed
Answer: (a) Open-circuited - Specific gravity of electrolyte is measured using a:
(a) Lactometer
(b) Hydrometer
(c) Pyrometer
(d) Galvanometer
Answer: (b) Hydrometer - Which fuse type is used for motor circuits?
(a) Delayed response
(b) Fast-acting
(c) Cartridge
(d) Thermal
Answer: (a) Delayed response
Advanced Topics
- The synchronous speed of a 6-pole motor at 50 Hz is:
(a) 1000 rpm
(b) 1200 rpm
(c) 1440 rpm
(d) 1500 rpm
Answer: (a) 1000 rpm - Control rods in nuclear reactors are made of:
(a) Boron
(b) Cadmium
(c) Graphite
(d) Lead
Answer: (b) Cadmium - XLPE cable stands for:
(a) Cross Line Phase Earthing
(b) Cross Linked Poly Ethylene
(c) Excess Length Paper and Ebonite
(d) X ess Line Poly Ethylene
Answer: (b) Cross Linked Poly Ethylene - Which material is diamagnetic?
(a) Bismuth
(b) Nickel
(c) Cobalt
(d) Iron
Answer: (a) Bismuth - The electrochemical equivalent relates to:
(a) Atomic mass ratio
(b) Substance mass per coulomb
(c) Valency ratio
(d) None of these
Answer: (b) Substance mass per coulomb
For more practice, refer to the NCVT NIMI Question Bank or download PDFs from ITI Question Bank ITI Electrician Theory 1st year.
Nimi Mock Test Electrician 1st Year