Introduction – RRB Junior Engineer Exam Overview
The Railway Recruitment Board (RRB) Junior Engineer (JE) Recruitment exam is a crucial gateway for candidates aspiring to join Indian Railways in technical roles. With thousands of applicants each year, proper preparation and understanding of the exam pattern is key. This post provides recently asked questions along with detailed answers to help aspirants prepare effectively.
100 RRB Junior Engineer Exam MCQs with Answers – 2025
The RRB Junior Engineer (JE) Exam is one of the most sought-after technical recruitment exams for candidates aspiring to join Indian Railways. With a highly competitive selection process, thorough preparation is essential to secure a position. To help aspirants succeed, we have compiled a comprehensive list of 100 important MCQs with answers covering Civil, Electrical, Mechanical, General Science, and General Awareness topics. Practicing these questions will enhance your understanding, improve speed, and boost confidence for the exam.
Civil Engineering (25 Questions)
RRB Junior Engineer Recruitment Exam Question Answers for Civil Engineers
- Q: What is the main ingredient of cement?
A: Limestone - Q: Which type of foundation is used for heavy structures on weak soil?
A: Pile Foundation - Q: Which cement type is used for underwater construction?
A: Portland Slag Cement - Q: The maximum water-cement ratio for reinforced concrete is:
A: 0.45 - Q: What is the slump test used for?
A: Determining workability of concrete - Q: Which type of brick is suitable for foundation work?
A: Engineering Brick - Q: The modulus of elasticity of concrete depends mainly on:
A: Cement content and water-cement ratio - Q: Which soil is best for foundations?
A: Gravel and Sand - Q: What is the function of a retaining wall?
A: To prevent soil erosion or landslide - Q: The main purpose of reinforcement in concrete is:
A: To resist tensile forces - Q: What is the ratio of cement, sand, and aggregate in standard concrete mix?
A: 1:2:4 - Q: The maximum temperature of concrete should not exceed:
A: 32°C - Q: Which type of steel is used for reinforcement?
A: Mild Steel or TMT Bars - Q: What is a cantilever?
A: A projecting beam fixed at one end - Q: What type of arch is semicircular?
A: Roman Arch - Q: The unit of moment of resistance in concrete beam is:
A: kN·m - Q: What is the purpose of a damp-proof course (DPC)?
A: To prevent rising of moisture - Q: Which type of cement is used in cold weather concreting?
A: Rapid Hardening Cement - Q: The field test for checking quality of bricks is:
A: Water Absorption Test - Q: The span of a simply supported beam is:
A: Distance between two supports - Q: The standard thickness of plaster on walls is:
A: 12–15 mm - Q: The basic component of mortar is:
A: Cement and Sand - Q: Which type of load is permanent on a structure?
A: Dead Load - Q: The purpose of expansion joints in concrete structures is:
A: To absorb thermal expansion - Q: The permissible stress in mild steel is:
A: 140–165 N/mm²
RRB Junior Engineer Recruitment Exam Question Answers -Electrical Engineering (25 Questions)
RRB Junior Engineer Recruitment Exam Question Answers for Electrical Engineers Listed below
- Q: The SI unit of electric current is:
A: Ampere - Q: What is the purpose of a transformer?
A: To increase or decrease AC voltage - Q: Which type of motor is used in fans?
A: Induction Motor - Q: Ohm’s law states that:
A: V = IR - Q: What does a circuit breaker do?
A: Protects electrical circuits from overcurrent - Q: A fuse protects a circuit by:
A: Melting when current exceeds limit - Q: What is the unit of electrical resistance?
A: Ohm - Q: The power factor of a purely resistive AC circuit is:
A: 1 - Q: What is the function of a relay?
A: To operate a high-power circuit using low-power input - Q: The frequency of standard AC mains in India is:
A: 50 Hz - Q: What is the purpose of a capacitor in AC circuit?
A: To improve power factor - Q: Which type of motor has high starting torque?
A: DC Shunt Motor - Q: Which material is used for electrical insulation?
A: Bakelite or PVC - Q: The EMF induced in a conductor moving in magnetic field depends on:
A: Speed of motion, magnetic field, and length of conductor - Q: Star-delta starter is used for:
A: Starting induction motors - Q: The unit of electrical energy is:
A: Kilowatt-hour (kWh) - Q: The main component of an electric generator is:
A: Armature - Q: In a 3-phase system, voltage difference between two phases is:
A: Line Voltage - Q: A transformer works on the principle of:
A: Electromagnetic induction - Q: In a parallel AC circuit, voltage across each branch is:
A: Same - Q: Which instrument measures current?
A: Ammeter - Q: The function of a diode is:
A: Allows current in one direction only - Q: Which motor is self-starting?
A: Squirrel Cage Induction Motor - Q: The insulation resistance is measured by:
A: Megger - Q: What is a rectifier?
A: Converts AC to DC
Mechanical Engineering (25 Questions)
- Q: What is the purpose of a governor in an engine?
A: To regulate engine speed - Q: Which material is used for making boiler tubes?
A: Steel - Q: What is the function of a clutch?
A: To connect/disconnect power transmission - Q: What type of gear is used to transmit motion between non-parallel shafts?
A: Bevel Gear - Q: Rankine cycle is associated with:
A: Steam Power Plants - Q: What is the function of a flywheel?
A: To store rotational energy - Q: The purpose of lubrication is:
A: To reduce friction and wear - Q: What is the unit of torque?
A: N·m - Q: The main purpose of a radiator in engines is:
A: To remove excess heat - Q: A single-acting engine does work in:
A: One direction of piston movement - Q: What is the function of a cam in a machine?
A: Converts rotary motion to reciprocating motion - Q: Which type of bearing is used for high-speed shafts?
A: Ball Bearing - Q: What is the efficiency of an ideal machine?
A: 100% - Q: What is the main function of a boiler?
A: To generate steam - Q: What is the purpose of a thermostat?
A: To regulate temperature - Q: A gear ratio is defined as:
A: Ratio of number of teeth on driving gear to driven gear - Q: The function of a piston ring is:
A: Prevent leakage of gas - Q: Which type of energy is present in a moving object?
A: Kinetic Energy - Q: What is the function of a coupling?
A: To connect two shafts - Q: The main component of refrigeration cycle is:
A: Compressor - Q: The unit of power in SI system is:
A: Watt - Q: What is the purpose of a boiler mountings?
A: To ensure safe operation - Q: Steam turbines work on which principle?
A: Impulse or Reaction principle - Q: The ideal gas equation is:
A: PV = nRT - Q: In a 4-stroke engine, number of strokes per cycle is:
A: 4
General Science & General Awareness (25 Questions)
- Q: Who is the current Chairman of the Railway Board?
A: [Update latest info] - Q: What is the chemical formula of water?
A: H?O - Q: The hardest natural substance is:
A: Diamond - Q: Which gas is used in electric bulbs?
A: Argon - Q: The national railway museum is located in:
A: New Delhi - Q: Who invented the telephone?
A: Alexander Graham Bell - Q: The capital of India is:
A: New Delhi - Q: Which planet is known as the Red Planet?
A: Mars - Q: The atomic number of Oxygen is:
A: 8 - Q: Who wrote the Indian National Anthem?
A: Rabindranath Tagore - Q: The largest organ in human body is:
A: Skin - Q: Speed of light in vacuum is approximately:
A: 3 × 10? m/s - Q: Who discovered penicillin?
A: Alexander Fleming - Q: Which is the largest planet in the solar system?
A: Jupiter - Q: What is the boiling point of water at sea level?
A: 100°C - Q: Which element is represented by symbol ‘Na’?
A: Sodium - Q: The first railway line in India was between:
A: Mumbai (Bori Bunder) – Thane - Q: The Earth revolves around the Sun in:
A: 365 days - Q: The full form of ISRO is:
A: Indian Space Research Organisation - Q: What is the SI unit of force?
A: Newton - Q: Which is the national bird of India?
A: Peacock - Q: Who is known as the father of Indian Railways?
A: Lord Dalhousie - Q: Water expands on:
A: Freezing - Q: Who wrote the book “India Wins Freedom”?
A: Maulana Abul Kalam Azad - Q: Which gas is essential for respiration?
A: Oxygen
RRB Junior Engineer Recruitment Exam 10 Sample Question Answers- Multiple Choice
1. Which of the following is a semiconductor material?
A) Copper
B) Silicon
C) Iron
D) Aluminum
Answer: B) Silicon
2. What is the unit of electrical resistance?
A) Ohm
B) Ampere
C) Volt
D) Farad
Answer: A) Ohm
3. In which year was the first railway line in India started?
A) 1853
B) 1857
C) 1862
D) 1875
Answer: A) 1853
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4. Which of the following is used to convert AC to DC?
A) Transformer
B) Rectifier
C) Inductor
D) Oscillator
Answer: B) Rectifier
5. What does CPU stand for in computers?
A) Central Processing Unit
B) Control Process Unit
C) Central Programming Unit
D) Computer Process Utility
Answer: A) Central Processing Unit
6. Which of the following forces is responsible for the rotation of a fan?
A) Gravitational force
B) Magnetic force
C) Centrifugal force
D) Electric force
Answer: D) Electric force
7. The SI unit of power is:
A) Newton
B) Joule
C) Watt
D) Pascal
Answer: C) Watt
8. Which of the following is a renewable source of energy?
A) Coal
B) Petroleum
C) Solar energy
D) Natural gas
Answer: C) Solar energy
9. Which Indian organization conducts the Junior Engineer Recruitment Examination?
A) SSC
B) UPSC
C) RRB
D) DRDO
Answer: C) RRB (Railway Recruitment Board)
10. In civil engineering, cement and sand are mixed in what ratio for plastering?
A) 1:2
B) 1:3
C) 1:4
D) 1:6
Answer: C) 1:4
Key Highlights of the Exam
- Exam Mode: Computer-Based Test (CBT)
- Subjects Covered:
- General Intelligence & Reasoning
- General Awareness & Current Affairs
- General Science & Engineering Concepts (Civil, Electrical, Mechanical)
- Duration: 90–120 minutes depending on the stage
- Marking Scheme: Positive and negative marking included
RRB Junior Engineer Recruitment Exam – Sample Questions and Answers
Here are some important questions that appeared in recent RRB JE exams, along with answers:
1. General Awareness Question
Q: Who is the current Chairman of the Railway Board?
A: [Answer with latest information]
2. General Science Question
Q: What is the main function of a transformer?
A: To increase or decrease AC voltage levels.
3. Civil Engineering Question
Q: Which type of foundation is preferred for heavy structures on weak soil?
A: Pile foundation.
4. Electrical Engineering Question
Q: What does an insulator do in an electric circuit?
A: It resists the flow of electric current, providing safety.
5. Mechanical Engineering Question
Q: What is the purpose of a governor in an engine?
A: To regulate the engine speed automatically.
(Add 10–15 more questions in a similar format depending on your post length.)
Tips for Preparing RRB JE Exam
- Understand the syllabus thoroughly – Focus on Civil, Electrical, and Mechanical Engineering core topics.
- Practice previous year question papers – Helps in understanding the question pattern.
- Time management – Attempt questions wisely; avoid spending too much time on one.
- Revision – Regularly revise formulas, concepts, and current affairs related to Railways.
- Mock Tests – Take online mock tests to improve speed and accuracy.
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