**Junior Engineer (JE), Assistant Engineer (AE), SSC-JE, RRB-JE and Polytechnic Lecturer** exams test core engineering fundamentals across branches. This free guide maps the **subjects examiners draw from** and gives **original practice MCQs with answers and explanations**. > **Honesty note:** These are **original practice questions written by Zenith Education** on the standard technical syllabus. They are *not* reproduced official previous-year papers. ## Branches the exam covers - **Civil Engineering** — structures, concrete, surveying, hydraulics. - **Mechanical Engineering** — thermodynamics, strength of materials, machines. - **Electrical Engineering** — circuits, machines, power systems. - **Electronics & Communication** — devices, digital logic, signals. - **Computer Science** — fundamentals, programming, networks. ## How to prepare 1. Fix your **branch syllabus** from the official notification. 2. Drill the **formula and unit basics** — they decide the first marks. 3. Keep a **standard-values sheet** (mix ratios, SI units, constants). 4. Practise **statement-based MCQs** under time. ## Free practice MCQs (with answers & explanations) **Q1. The SI unit of electrical resistance is the —** A) Volt B) Ampere C) Ohm D) Watt **Answer: C.** Resistance is measured in ohms (Ω). **Q2. Ohm's law states that voltage equals —** A) Current ÷ Resistance B) Current × Resistance C) Resistance ÷ Current D) Power × Time **Answer: B.** V = I × R. **Q3. The nominal mix ratio (cement : sand : aggregate) for M20 grade concrete is —** A) 1 : 2 : 4 B) 1 : 1.5 : 3 C) 1 : 3 : 6 D) 1 : 1 : 2 **Answer: B.** M20 nominal mix is 1 : 1.5 : 3. **Q4. The SI unit of force is the —** A) Joule B) Pascal C) Newton D) Watt **Answer: C.** Force is measured in newtons (N). **Q5. The first law of thermodynamics is essentially a statement of —** A) Conservation of energy B) Conservation of mass C) Increase of entropy D) Conservation of momentum **Answer: A.** Energy can be converted but not created or destroyed. **Q6. The output of a two-input AND gate is HIGH (1) only when —** A) Any one input is HIGH B) Both inputs are HIGH C) Both inputs are LOW D) Inputs differ **Answer: B.** An AND gate outputs 1 only if all inputs are 1. **Q7. A device that converts alternating current (AC) to direct current (DC) is a —** A) Rectifier B) Inverter C) Transformer D) Oscillator **Answer: A.** A rectifier performs AC-to-DC conversion. **Q8. The factor of safety is defined as the ratio of —** A) Working stress to ultimate stress B) Ultimate (or yield) stress to working stress C) Strain to stress D) Load to area **Answer: B.** FoS = ultimate (or yield) stress ÷ permissible working stress. ## Get the full notes Zenith's **Technical / Polytechnic Master Notes** cover these branches — **PYQ-mapped and bilingual (Hindi & English**, regional on request) — with a **free sample** of each unit. - ⚙️ **[Browse Technical & Polytechnic notes →](/cat/technical)** - 📖 **[Read a free sample →](/samples)** *Zenith Education, Jaipur — PYQ-mapped master notes for Engineering & Polytechnic, Agriculture, Scientific Officer, Nursing and more. English & Hindi medium, regional on demand.*