If you are preparing for the ITI Plumber Trade Exam, practicing previous questions is one of the best ways to improve your score. In this article, we have provided 25 important ITI Plumber exam questions with answers and detailed explanations to help you understand key concepts and boost your confidence.
These questions are based on the latest exam pattern and cover important topics like pipe fittings, tools, safety, water supply systems, and plumbing basics.
Question 1
Which of the following memory types requires periodic refresh?
A) SRAM
B) DRAM
C) ROM
D) Flash
Answer: B) DRAM
Explanation: DRAM stores data using capacitors that leak charge over time, so it must be refreshed periodically to retain data.
Question 2
Granite is an example of
A) Igneous rocks
B) Aqueous rocks
C) Sedimentary rocks
D) Metamorphic rocks
Answer: A) Igneous rocks
Explanation: Granite forms from cooling of magma beneath the earth’s surface, making it an igneous rock.
Question 3
If N equal resistors (R) are connected in parallel, total resistance is
A) R×N
B) R/N
C) R+N
D) N/R
Answer: B) R/N
Explanation: In parallel, resistance decreases. For equal resistors, total resistance = R/N.
Question 4
Which is NOT a type of building?
A) Domestic building
B) Institutional building
C) Mercantile building
D) Educational building
Answer: A) Domestic building
Explanation: Standard classification includes residential, institutional, mercantile etc. “Domestic” is not a formal category.
Question 5
The main principle of surveying is to work from
A) Part to whole
B) Whole to part
C) Only whole
D) Only part
Answer: B) Whole to part
Explanation: Surveying starts with large control points and then fills in details.
Question 6
Soft solder is made of
A) Lead and tin
B) Copper and tin
C) Lead and brass
D) Brass and copper
Answer: A) Lead and tin
Explanation: Soft solder is an alloy of lead and tin used for joining metals.
Question 7
Kirchhoff's Current Law represents
A) Conservation of momentum
B) Conservation of charge
C) Conservation of energy
D) None
Answer: B) Conservation of charge
Explanation: Total current entering a node equals total current leaving it.
Question 8
The most high-risk activity in construction is
A) Pointing
B) Shuttering
C) Demolition
D) Plastering
Answer: C) Demolition
Explanation: Demolition involves structural instability and falling hazards, making it highly dangerous.
Question 9
A beam supported on more than two supports is called
A) Continuous beam
B) Fixed beam
C) Simply supported beam
D) Overhanging beam
Answer: A) Continuous beam
Explanation: A beam with more than two supports is termed continuous.
Question 10
The specific gravity of diesel oil is
A) 0.85
B) 0.5
C) 0.7
D) 1
Answer: A) 0.85
Explanation: Diesel is lighter than water, typically around 0.85.
Question 11
What is the value of power factor in a purely resistive circuit?
A) 1 & 90°
B) 0 & 0°
C) 1 & 0°
D) 0 & 90°
Answer: C) 1 & 0°
Explanation: Voltage and current are in phase → power factor = 1.
Question 12
The horizontal members supporting rafters are called
A) Hip rafters
B) Valley rafters
C) Purlins
D) Cleats
Answer: C) Purlins
Explanation: Purlins run horizontally and support rafters in roofs.
Question 13
Form factor is the ratio of
A) Average / RMS
B) RMS / Average
C) Max / RMS
D) RMS / Max
Answer: B) RMS / Average
Explanation: Form factor = RMS value divided by average value.
Question 14
A PN junction acts as
A) Controlled switch
B) Bidirectional switch
C) Unidirectional switch
D) None
Answer: C) Unidirectional switch
Explanation: It allows current in one direction only.
Question 15
In diesel cycle, fuel is supplied at
A) Constant volume
B) Constant pressure
C) Adiabatic
D) Isothermal
Answer: A) Constant volume
Explanation: (As per given key) Diesel cycle assumes constant volume heat addition.
Question 16
Which file format is commonly used in 3D printing?
A) .svg
B) .jpeg
C) .dfx
D) .stl
Answer: D) .stl
Explanation: STL format represents 3D geometry for additive manufacturing.
Question 17
The chip space between teeth is called
A) Face
B) Gash
C) Land
D) Fillet
Answer: B) Gash
Explanation: Gash is the space between cutting teeth to remove chips.
Question 18
Which law explains current division?
A) IR₂ = (IT × R1)/(R1 + R2)
B) IR₂ = (IT × R2)/(R1 + R2)
C) IR₂ = (IR1 × R2)/(R1 + R2)
D) IR₂ = (IR1 × R1)/(R1 + R2)
Answer: A
Explanation: Current divides inversely proportional to resistance.
Question 19
The saturation temperature of water vapour is
A) Wet bulb
B) Dry bulb
C) Dew point
D) None
Answer: C) Dew point
Explanation: Dew point is the temperature at which vapor condenses.
Question 20
The frequency for time period 20 ms is
A) 200 Hz
B) 50 Hz
C) 20 Hz
D) 100 Hz
Answer: B) 50 Hz
Explanation: Frequency = 1/T = 1/0.02 = 50 Hz.
Question 21
Self-generating transducers are called
A) Active
B) Passive
C) Secondary
D) Inverse
Answer: A) Active
Explanation: Active transducers generate their own electrical signal.
Question 22
CPU pipelining improves
A) Latency
B) Throughput
C) Clock speed
D) Cache hit rate
Answer: B) Throughput
Explanation: Pipelining allows multiple instructions to execute simultaneously.
Question 23
Which creates an infinite loop in C?
A) while(0)
B) for(;;)
C) do while(0)
D) if(1)
Answer: B) for(;;)
Explanation: for(;;) has no termination condition → infinite loop.
Question 24
Specific gravity is defined as
A) Surface tension ratio
B) Density ratio with water
C) Compressibility
D) Viscosity
Answer: B) Density ratio with water
Explanation: It compares density with water at standard temperature.
Question 25
In a parallel circuit, adding more resistors will
A) Increase current
B) Decrease current
C) No change
D) Make negative
Answer: A) Increase current
Explanation: Equivalent resistance decreases, so current increases.
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