Which Bureau of Indian Standards specification applies to ethanol-blended motor gasoline?
- A.IS 1460
- B.IS 2796
- C.IS 17021
- D.IS 15607
Correct answer
Explanation
The correct answer is IS 17021. This is the Bureau of Indian Standards specification for ethanol-blended motor gasoline, and E20 petrol supplied by the three public sector oil marketing companies across the country is required to conform to it. The standard, as amended in August 2025, prescribes the methods by which ethanol content must be determined, namely Fourier Transform Infrared Spectroscopy, water extraction under its Annex C, or gas chromatography. Where gas chromatography is used, the sample must first be diluted in equal proportion with oxygenate-free petrol and the result corrected against a certified reference material. The ministry's objection to the Karnataka certificates was precisely that they mentioned ethanol by gas chromatography without naming the test method, the dilution step or the reference material. Options A, B and D are other Indian standards and do not cover ethanol-blended petrol.
Read the full article: E20 Petrol Passes Quality Test in 893 Samples Nationwide
Practice Questions
How many E20 petrol samples were tested and found compliant across 27 States and Union Territories?
- A.456 samples
- B.893 samples
- C.1,250 samples
- D.2,393 samples
Show answer
Under the Quality Coordination Cell exercise of the oil marketing companies and the Centre for High Technology, 893 E20 samples were drawn from depots and retail outlets in 27 States and Union Territories and tested for ethanol content, and every one of them fell inside the prescribed band of 19…
Read the full explanation →What ethanol content was recorded on average in the samples tested in Karnataka?
- A.19.30 per cent
- B.21.50 per cent
- C.26 per cent
- D.31 per cent
Show answer
All 56 samples tested in Karnataka, taken from different locations and from all three oil marketing companies, conformed to the prescribed specification, with ethanol content ranging between 19 and 20 per cent and averaging that figure.
Read the full explanation →Since ethanol supply year 2014-15, how much foreign exchange has the ethanol blending programme saved?
- A.More than Rs 62,000 crore
- B.More than Rs 1.01 lakh crore
- C.More than Rs 1.66 lakh crore
- D.More than Rs 1.97 lakh crore
Show answer
The ministry listed four cumulative outcomes of the blending programme since ethanol supply year 2014-15: foreign exchange savings above that amount, substitution of about 316 lakh metric tonnes of crude oil, avoidance of about 952 lakh metric tonnes of carbon dioxide, and transfers of more than Rs 1.66 lakh crore…
Read the full explanation →Which body's sub-committee invokes the stages of GRAP in the National Capital Region?
- A.Central Pollution Control Board (CPCB)
- B.Commission for Air Quality Management (CAQM)
- C.India Meteorological Department (IMD)
- D.Delhi Pollution Control Committee (DPCC)
Show answer
It is the CAQM's Sub-Committee on GRAP that met on 6 November 2026, studied the air quality data and forecasts, and decided to put Stage-III into effect across the whole NCR.
Read the full explanation →Delhi's daily average AQI on 6 November 2026, which led to the invoking of GRAP Stage-III, was:
- A.328
- B.382
- C.412
- D.450
Show answer
According to the daily AQI bulletin of the Central Pollution Control Board (CPCB) for 6 November 2026, Delhi recorded a daily average Air Quality Index of 382, which lies in the 'Very Poor' category.
Read the full explanation →