100+ Free Junior Operator Grade I Practice Questions

Pass your IOCL Junior Operator / Grade I Computer Based Test (Marketing Division Non-Executive) exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: Junior Operator Grade I Exam

100 MCQs

Official CBT question count in 120 minutes

IOCL Marketing Advt IOCL/MKTG/HO/REC/2025

50 + 50

Section A and Section B marks

IOCL Junior Operator CBT structure

35% / 40%

Sectional and overall CBT minima for SPPT shortlist

IOCL Marketing selection methodology

Qualifying SPPT

Skill/Proficiency/Physical Test does not add merit marks

IOCL Marketing Advt selection methodology

₹300

Application fee (exempt categories apply)

IOCL Marketing Advt fee rules

IOCL Junior Operator Grade I: 100 MCQs / 120 min (50 science/professional + 50 aptitude), CBT shortlist then qualifying SPPT. Fee ₹300 or exempt.

Sample Junior Operator Grade I Practice Questions

Try these sample questions to test your Junior Operator Grade I exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Motor Spirit (MS) used in petrol engines is commonly known as which retail fuel?

A.Diesel

B.Petrol (gasoline)

C.Kerosene

D.Furnace oil

Explanation: Motor Spirit (MS) is the industry name for petrol/gasoline used in spark-ignition engines.

2Which property primarily indicates how readily a liquid fuel can form an ignitable vapour–air mixture near its surface?

A.Pour point

B.Flash point

C.Cetane number

D.Viscosity index

Explanation: Flash point is the lowest temperature at which a liquid gives off enough vapour to form an ignitable mixture with air near its surface under a standard test method.

3Complete combustion of a hydrocarbon fuel in excess air primarily produces which products?

A.Carbon monoxide and hydrogen

B.Carbon dioxide and water

C.Carbon and sulphur only

D.Nitrogen oxides only

Explanation: With sufficient oxygen, carbon oxidizes to CO2 and hydrogen to H2O.

4Which SI unit is used for pressure?

A.Newton

B.Pascal

C.Joule

D.Watt

Explanation: Pressure is force per unit area; the SI unit is the pascal (Pa = N/m²).

5A Class B fire typically involves which fuel type?

A.Ordinary combustibles like wood and paper

B.Flammable liquids and gases

C.Energized electrical equipment

D.Combustible metals like magnesium

Explanation: Class B fires involve flammable liquids and gases such as petrol, diesel, and LPG vapour.

6Which PPE is most appropriate as basic eye protection against liquid splash at a fuel-handling site?

A.Ear muffs only

B.Safety goggles or chemical splash goggles

C.Cotton gloves only

D.Steel-toe boots only

Explanation: Splash risk to eyes calls for safety or chemical splash goggles.

7Density of a liquid is best defined as:

A.Mass per unit volume

B.Volume per unit mass

C.Force per unit area

D.Energy per unit time

Explanation: Density ρ = mass/volume.

8LPG used for domestic cooking in India is typically based mainly on which hydrocarbons?

A.Methane and ethane only

B.Propane and/or butane

C.Hexane and heptane

D.Benzene and toluene

Explanation: Commercial LPG is primarily propane, butane, or their mixtures.

9Which instrument commonly measures atmospheric or gauge pressure in plant practice?

A.Thermocouple

B.Manometer or pressure gauge

C.Hydrometer

D.Tachometer

Explanation: Manometers and pressure gauges measure pressure.

10Viscosity of a liquid fuel generally describes its:

A.Resistance to flow

B.Ability to dissolve salts

C.Colour only

D.Electrical conductivity

Explanation: Viscosity is internal resistance to flow.

About the Junior Operator Grade I Exam

The IOCL Junior Operator Grade I CBT (Marketing Division non-executive recruitment) is a 100-question, 120-minute objective test with Section A (Professional Knowledge/General Science, 50 marks) and Section B (Numerical 20, Reasoning 20, General Awareness 10). Candidates must meet sectional and overall CBT minima to be shortlisted for a Skill/Proficiency/Physical Test (SPPT), which is qualifying in nature. Application fee is ₹300 for applicable categories (SC/ST/PwBD/Ex-Servicemen exempt) per Advt No. IOCL/MKTG/HO/REC/2025. This free practice bank provides 100 exam-aligned questions matching the official section weights.

Assessment

Section A Professional Knowledge/General Science 50; Section B Numerical Ability 20, Reasoning 20, General Awareness 10. Duration 120 minutes.

Time Limit

120 minutes

Passing Score

35% in each of Section A and B and 40% overall to be considered for SPPT shortlisting (SC/ST 5% relaxation as notified); SPPT is qualifying

Exam Fee

₹300; SC/ST/PwBD/Ex-Servicemen exempt (Advt IOCL/MKTG/HO/REC/2025) (Indian Oil Corporation Limited — Marketing Division)

Junior Operator Grade I Exam Content Outline

50.00%

Professional Knowledge / General Science

Operator-relevant professional knowledge and general science

20.00%

Numerical Ability

Arithmetic and numerical problem solving

20.00%

Reasoning Ability

Logical and reasoning abilities

10.00%

General Awareness

General awareness including energy/economy basics

How to Pass the Junior Operator Grade I Exam

What You Need to Know

Passing score: 35% in each of Section A and B and 40% overall to be considered for SPPT shortlisting (SC/ST 5% relaxation as notified); SPPT is qualifying
Assessment: Section A Professional Knowledge/General Science 50; Section B Numerical Ability 20, Reasoning 20, General Awareness 10. Duration 120 minutes.
Time limit: 120 minutes
Exam fee: ₹300; SC/ST/PwBD/Ex-Servicemen exempt (Advt IOCL/MKTG/HO/REC/2025)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

Junior Operator Grade I Study Tips from Top Performers

1Treat Section A as half the paper—science and professional basics must clear a separate 35% sectional floor.

2Do not ignore the 10 GA marks; they are part of Section B's 50-mark block with its own sectional minimum.

3Practice numerical sets with full working; operator papers reward unit conversions and percentage work.

4After CBT readiness, separately train for SPPT using only the physical/skill guidance in the official advertisement.

5Keep certificates ready—scrutiny of uploaded documents occurs after CBT before SPPT calls.

Frequently Asked Questions

What is the IOCL Junior Operator CBT pattern?

The CBT has 100 objective questions in 120 minutes: Section A Professional Knowledge/General Science (50) and Section B Numerical (20), Reasoning (20), and General Awareness (10).

Is SPPT part of the merit score?

No. For Junior Operator posts, SPPT is qualifying in nature. CBT performance is used for shortlisting; candidates must still qualify SPPT to proceed.

What CBT scores are needed to be shortlisted for SPPT?

Generally at least 35% in Section A and Section B separately and 40% overall (with 5% relaxation for SC/ST as notified in the advertisement).

What is the application fee?

₹300 non-refundable for applicable candidates. SC/ST/PwBD/Ex-Servicemen candidates are exempt from the application fee.

What is the age limit?

Typically minimum 18 and maximum 26 years for Unreserved candidates as on the advertisement's reference date, with notified category relaxations.