The Union Public Service Commission known as UPSC is responsible for recruiting and taking examinations for various Central Government A group and B group of central services. The UPSC ESE is also known as IES exams are conducted for hiring various A & B group engineers in different governmental departments of India. The aspirants from engineering need to practice and solve the UPSC ESE Important Questions to pass the Prelims and Mains exam.

  • The Group A & B engineers examination and recruitment in the various central government departments are conducted by the Union Public Service Commission (UPSC). 
  • The UPSC ESE Prelims and Mains serve as a vital qualifier for engineering candidates preparing for different engineering positions. 
  • The UPSC ESE is a three-tier examination with the Prelims, Mains and Personal Interview, and by clearing all the stages, a candidate can secure a job in various government departments. 
  • The UPSC ESE Prelims exam is an offline objective test with multiple choice questions and answer format.
  • The UPSC ESE Mains exam is an offline subjective test where candidates need to attempt at least 5 out of 8 questions and write to the point and brief answers. 
  • The Prelims has two papers the General Studies & Engineering Aptitude and Engineering Discipline topics of the relevant stream.
  • The Mains has two papers from the Engineering Discipline topics of the relevant stream.
  • The General Studies & Engineering Aptitude has topics like Engineering Mathematics, Engineering Aptitude, Project Management, and Material Science.
  • The Civil Engineerings has topics like Surveying and Geology, Hydrology and Water Resources Engineering, Building Materials and Structure Analysis. 
  • Mechanical Engineering has topics like Mechatronics and Robotics, Engineering Mechanics, Fluid Mechanics, and Turbo Machineries. 
  • The Electronics Engineerings has topics like Network Theory, Electro Magnetics, Analog, and Digital Circuits, Advanced Electronics Topics.
  • The Electrical Engineering has topics like Computer Fundamentals, Power Systems, Engineering Mathematics, and Control Systems. 
  • Engineering candidates preparing for UPSC ESE exams need to follow and practice the important questions and topics to get qualified. 

UPSC ESE Important Questions from General Studies & Engineering Aptitude

The General Studies and Engineering Aptitude paper is common to all the engineering aspirants preparing for the UPSC ESE. The UPSC ESE Important Questions for General Studies and Engineering Aptitude are discussed in details below.

Consider the given statements :

  1. Mobile cranes are a versatile and reliable means of lifting on site.
  2. Mobile cranes are sophisticated machines which are designed for lifting efficiently.

Which of the above statements is or are correct?

(a) Only 1

(b) Only 2

(c) Both 1 and 2 

(d) Neither 1 nor 2

Ans: (b) Only 2. 

Q.When two or more chemically different monomers are polymerized to form a cross-linked polymer along with some byproducts such as water, the process is known as?

(a) Crystallographic polymerization

(b) Addition polymerization

(c) Copolymerization

(d) Condensation polymerization

Ans: (d) Condensation polymerization. 

Q. The transmission of real-time streams across networks uses Bandwidth Allocation Mechanism (BAM), which is based on

(a) Bucket rate

(b) Packet size

(c) Token bucket depth

(d) Stream peak rate 

Ans: (d) Stream peak rate.

Q. A wholesaler purchases some articles for Rs. 1600. If he had bought 8 more articles for the same amount, each article would cost INR.10 less. The number of articles he buys is?

Ans: 32. 

Q. A hemisphere depression is cut out from one face of the cubical wooden block such that the radius r of the hemisphere is equal to half of the edge of the cube. Calculate the surface area of the remaining solid?

Ans: r2 + (π +24).

Q. A tourist covers half of his journey by train at 60 km/h, half of the remainder by bus at 30 km/h and the rest by cycle at 10 km/h. The average speed of the tourist during the journey is?

Ans: 24km/hr.

UPSC ESE Important Topics for General Studies & Engineering Aptitude

  • Current issues of national and international importance relating to social, economic and industrial development.
  • Engineering Aptitude covering Logical Reasoning and Analytical Ability.
  • Engineering Mathematics and Numerical Analysis.
  • General Principles of Design, Drawing, Importance of Safety.
  • Standards and Quality Practices in production, construction, maintenance and services.
  • Basics of Energy and Environment: Conservation, Environmental Pollution and Degradation, Climate Change, Environmental Impact Assessment.
  • Basics of Project Management.
  • Basics of Material Science and Engineering.
  • Information and Communication Technologies (ICT) based tools and their applications in Engineering such as networking, e-governance and technology-based education.
  • Ethics and Values in the engineering profession.

UPSC ESE Important Questions from Civil Engineering 

The UPSC ESE Civil Engineering chapters incorporate topics from Paper I and Paper II for both examinations of the Prelims 2 and Mains 1 & 2. The level of difficulty, however, progressively increases in the Mains Test 1 & 2. The UPSC ESE Important Questions for Civil Engineering are given below.

Q. Consider a triangular section with base b and height has shown in the figure.

The shape factor will be nearly?

Ans: 2.3.

Q. A rectangular beam 200 mm wide has an effective depth of 350 mm. It is subjected to a bending moment of 24,000 Nm. The permissible stresses are c = 5 N/mm2, t =140 N/mm2 ; and m is 18. The required area of the tensile reinforced will be?

Ans: 778 mm2

Q. During earthquakes the corner and edge columns may be subjected to?

Ans: Combined biaxial bending and tension.

Q. A masonry dam 8 m high 1.5 m wide at the top and 5 m wide at the base retains water to a depth of 7.5 m, the water face of the dam is vertical. If the weight of water is 9.81kN/m3, the weight of masonry is 22 kN/m3, the maximum intensity of stress developed at the base will be near?

Ans: 182 kN/m2.

Q. Consider the given data for irrigation water:

No. Concentration Milli - equivalent per litre
1. Na+ 24
2. Ca++ 3.6
3. Mg++ 2

The Sodium Absorption Ratio (SAR) is around?

Ans: 14.3.

UPSC ESE Important Topics for Civil Engineering 

Civil Engineering Paper I

  • Building Materials.
  • Solid Mechanics.
  • Structural Analysis.
  • Design of Steel Structures.
  • Design of Concrete and Masonry Structures.
  • Construction Practice, Planning and Management.

Civil Engineering Paper II

  • The flow of Fluids, Hydraulic Machines and Hydro Power.
  • Hydrology and Water Resources Engineering.
  • Environmental Engineering.
  • Geotechnical Engineering and Foundation Engineering.
  • Surveying and Geology.
  • Transportation Engineering.

UPSC ESE Important Questions from Mechanical Engineering 

The UPSC ESE Mechanical Engineering contains chapters from Paper I and Paper II for both examinations of the Prelims 2 and Mains 1 & 2. The UPSC ESE Important Questions for Mechanical Engineering stream includes the following.

Q. When a load of 20 kN is gradually applied at a particular point in a beam, it produces maximum bending stress of 20 MPa and a deflection of 10 mm. What will be the height from which a load of 5kN should fall onto the beam at the same point if the maximum bending is 40 MPa?

Ans: 60mm.

Q. The shock-absorbing capacity (resilience) of bolts can be increased by?

(a) increasing the shank diameter above the core diameter of threads

(b) reducing the shank diameter to the core diameter of threads

(c) decreasing the length of the shank portion of the bolt

(d) pre-heating of the shank portion of the bolt

Ans: (b) reducing the shank diameter to the core diameter of threads.

Q. In ladder logic programming, an alternative in place of using the same internal relay contact for every rung is to use?

Ans: Master control relay. 

Q. A good approximation of the measured solar spectrum is made by?

Ans: Black-body energy distribution. 

Q. Which one of the following is suitable for fuel cell electric vehicle (FCEV)? 

(a) Direct methanol fuel cell (DMFC) 

(b) Alkaline fuel cell (AFC) 

(c) Proton exchange membrane fuel cell (PEMFC) 

(d) Solid oxide fuel cell (SOFC) 

Ans: (c) Proton exchange membrane fuel cell (PEMFC).

UPSC ESE Important Topics for Mechanical Engineering 

Mechanical Engineering Paper I

  • Fluid Mechanics.
  • Thermodynamics and Heat Transfer.
  • IC Engines, Refrigeration and Air Conditioning.
  • Turbo Machinery.
  • Power Plant Engineering.
  • Renewable Sources of Energy.

Mechanical Engineering Paper II

  • Engineering Mechanics.
  • Engineering Materials.
  • Mechanisms and Machines.
  • Design of Machine Elements.
  • Mechatronics and Robotics.
  • Manufacturing, Industrial and Maintenance Engineering.

UPSC ESE Important Questions from Electrical Engineering 

The UPSC ESE Electrical Engineering comprises of topics from Paper I and Paper II for both examinations of the Prelims 2 and Mains 1 & 2. The UPSC ESE Important Questions for Electrical Engineering stream are provided below:

Q. A 0-150 V voltmeter has a guaranteed accuracy of 1% full-scale reading. The voltage measured by this instrument is 83 V. The limiting error will be around?

Ans: 1.8%.

Q. There will be serious errors if the power factor of a non-sinusoidal waveform is measured by electrodynamometer power factor meter. This is true for 

(a) Single-phase meters alone 

(b) 3-phase meters only 

(c) Both Single-phase meters and 3-phase meters 

(d) 3-phase meters with balanced loads 

Ans: (a) Single-phase meters alone.

Q. Convert decimal 41.6875 into equivalent binary:

Ans: 101001.1011.

Q. A 500 kVA transformer has an efficiency of 95% at full load and also at 60% of full load, both at upf. The efficiency of the transformer at 3/4th full load will be around?

Ans: 95%.

Q. A 500 hp, 6-pole, 3-phase, 440V, 50Hz induction motor has a speed of 950 rpm on full-load. The full load slip and the number of cycles the rotor voltage makes per minute will be respectively?

Ans: 5% and 150. 

UPSC ESE Important Topics for Electrical Engineering 

Electrical Engineering Paper I

  • Engineering Mathematics.
  • Electrical Materials.
  • Electric Circuits and Fields.
  • Basic Electronics Engineering.
  • Computer Fundamentals.

Electrical Engineering Paper II

  • Analog and Digital Electronics.
  • System and Signal Processing.
  • Control Systems.
  • Power Systems.
  • Electrical Machines.
  • Power Electronics and Drives.

UPSC ESE Important Topics From Electronics Engineering 

The UPSC ESE Electronics Engineering incorporates topics from Paper I and Paper II for both examinations of the Prelims 2 and Mains 1 & 2. The UPSC ESE Important Questions for Electronics Engineering are: 

Q. An electric power generating station supplies power to three loads A, B and C. Only a single generator is required when anyone load is switched on. When more than one load is on, an auxiliary generator must be started. The Boolean equation for the control of switching of the auxiliary generator will be?

Ans: AB+AC+BC.

Q. For Gaussian and White channel noise, the capacity of a low-pass channel with a usable bandwidth of 3000 Hz and S/N = 103at the channel output will be?

Ans: 30,000bits/s.

Q. An amplitude modulated amplifier has a radio frequency output of 50 W at 100% modulation. The internal loss in the modulator is 10 W. The unmodulated carrier power is?

Ans: 40W.

Q. The frequency where magnitude M has a peak value in frequency response is known as?

Ans: Resonant Frequency.

Q. In a cache with 64-byte cache lines, how many bits are used to determine which byte within a cache line an address points to? 

Ans: 6.

UPSC ESE Important Topics for Electronics Engineering 

Electronics Engineering Paper I

  • Basic Electronics Engineering.
  • Basic Electrical Engineering.
  • Material Science.
  • Electronic Measurements and Instrumentation.
  • Network Theory.
  • Analog and Digital Circuits.

Electronics Engineering Paper II

  • Analog and Communication Systems.
  • Control Systems.
  • Electro Magnetics.
  • Computer Organization and Architecture.
  • Advanced Electronics Topics.
  • Advanced Communication Topics.

The engineering aspirants can only prepare for the UPSC ESE exams. The candidates are required to qualify all the three levels of the test, including the Personal Interview, to get an engineering job in the Central Government. The candidates must be familiar with the question patterns and have to prepare accordingly from both the conventional concepts of engineering and the associated streams to qualify the Prelims and Mains exam.

PSPCL Exam Dates


When is the UPSC ESE Exam 2020 conducted?

The UPSC ESE (Engineering Services Examination) is scheduled on 5th January 2020. 

What are the different services or posts offered under UPSC ESE Recruitment 2020?

There are four different services or posts offered under UPSC ESE Recruitment 2020 i.e., 

1. Civil Engineering

2. Mechanical Engineering

3. Electrical Engineering

4. Electronics & Telecommunication Engineering

When will the UPSC ESE Results 2020 declared?

The UPSC ESE Results 2020 will be released after a month of the exam.

How many UPSC ESE vacancies are released this year?

A total of 495 vacancies have been released under UPSC ESE Recruitment 2020 including 21 Disability vacancies.

For how many marks is UPSC ESE Exam conducted?

The UPSC ESE Prelims exam is conducted for 500 marks while the Mains exam is conducted for 600 marks.