Static GK makes up most of the General Awareness syllabus of RRB JE, and General Science adds a larger block of its own. CEN 04/2026 lists Indian geography, the culture and history of India including the freedom struggle, Indian Polity and Constitution, the Indian Economy and environmental issues concerning India and the world. In CBT-1 these share 15 questions with current affairs, while General Science, which the CEN defines as Physics, Chemistry and Life Sciences up to the 10th Standard CBSE syllabus, has 30 questions of its own. CBT-2 repeats the General Awareness syllabus in 15 questions and adds 15 on Physics and Chemistry, 10 on Basics of Computers and Applications and 10 on Basics of Environment and Pollution Control. This page holds GK24's topic-wise GK notes for RRB JE: Polity, History, Geography, the Economy, Art and Culture, Environment and Ecology, General Science and Computer basics. Each note is a set of short facts and tables in English and Hindi that can be revised in one sitting. Read one topic, solve its quiz and previous-year questions, and return to it a week later. With 15 General Awareness questions spread over eight areas, breadth matters more than depth, while General Science rewards thorough revision of Class 10 concepts.
Which one of the following cannot be polarised?
Polarisation means restricting the vibrations of a wave to one plane, which is only possible if the vibrations are perpendicular to the direction of travel.
Read the full explanation →The resolving power of an astronomical telescope can be increased by
The smallest angular separation a telescope can resolve is 1.22 times the wavelength divided by the diameter of the objective, so a larger aperture means a smaller limit of resolution and a greater resolving power.
Read the full explanation →A person standing in a room can hear someone speaking in the next room through an open door but cannot see the speaker. The reason is that
Diffraction, the bending of a wave round an edge, is appreciable only when the obstacle or opening is of the same order of size as the wavelength.
Read the full explanation →Two Polaroids are placed one behind the other. The light coming out is completely cut off when the angle between their planes of transmission is
By Malus's law the intensity transmitted by the second Polaroid is the intensity falling on it multiplied by the square of the cosine of the angle between the two transmission planes.
Read the full explanation →In Young's double slit experiment the width of a fringe will increase if
The fringe width equals the wavelength multiplied by the distance of the screen and divided by the separation of the two slits.
Read the full explanation →The brilliant colours seen in a soap bubble or in a thin film of oil spread on water are caused by
The light reflected from the upper surface of the thin film and the light reflected from the lower surface travel slightly different distances and interfere.
Read the full explanation →The phenomenon that establishes the transverse nature of light waves is
Only a transverse wave, in which the vibrations are at right angles to the direction of travel, can have those vibrations restricted to a single plane by a Polaroid.
Read the full explanation →When a thin glass plate of refractive index 1.5 is introduced in one of the arms of a Michelson interferometer using light of wavelength 5890 angstrom, there is a shift of 10 fringes. The thickness of the plate is
Inserting a plate of thickness t in one arm makes the light cross it twice, so the extra path introduced is twice the thickness times the quantity refractive index minus one.
Read the full explanation →The headlights of a distant car are 1.4 m apart. If the diameter of the pupil of the eye is 3 mm, what is the maximum distance at which the two headlights can be resolved? Consider the headlights as point sources of wavelength 500 nm.
By the Rayleigh criterion the smallest angle the eye can resolve is 1.22 times the wavelength divided by the diameter of the pupil, that is 1.22 multiplied by 500 nanometres and divided by 3 millimetres, which comes to about 2.03 times ten to the power minus four radian.
Read the full explanation →Brewster's law is (where the symbol mu stands for the refractive index and i_p for the polarising angle)
Brewster found that when unpolarised light falls on a transparent surface at one particular angle of incidence, called the polarising angle, the reflected light is completely plane polarised, and at that angle the refractive index of the surface equals the tangent of the polarising angle.
Read the full explanation →'One Nation, One Time', referred to at the CIML meeting, is the name of which Indian project?
Smt. Nidhi Khare, Secretary in the Department of Consumer Affairs, described 'One Nation, One Time' as this project, whose aim is to make accurate, reliable and traceable Indian Standard Time available throughout the country.
Read the full explanation →What was the theme of the international seminar held at the opening of the CIML meeting in New Delhi?
The programme in New Delhi began with an international seminar on that theme, and the first session of the committee followed it.
Read the full explanation →The International Committee of Legal Metrology (CIML) is the governing committee of which international organisation?
CIML is the committee of the OIML, and the meeting in New Delhi brings together delegates, officials and technical experts from member countries to take forward cooperation on measurement standards, protection of consumers and fair trade.
Read the full explanation →Which edition of the Meeting of the International Committee of Legal Metrology (CIML) is India hosting in New Delhi in October 2026?
India is hosting the 61st Meeting of the International Committee of Legal Metrology at New Delhi, and the sittings run from 26 to 28 October 2026.
Read the full explanation →Which two countries were cited as already making wide use of flex fuel technology?
While explaining the amendment, the Ministry noted that flex fuel technology is already in use in these countries, where vehicles are built to operate on a range of ethanol and petrol blends drawn from a single fuel tank.
Read the full explanation →E85 fuel contains up to what share of ethanol by volume?
E85 is a blend of petrol and ethanol in which ethanol forms up to that share by volume. In this notation the letter E denotes ethanol while the number indicates the proportion of ethanol present in the fuel, which is why E100 refers to a fuel consisting predominantly of ethanol.
Read the full explanation →Which rules has the Ministry of Road Transport and Highways amended to support E85 and E100 flex fuel vehicles?
The Ministry notified amendments to these rules so that vehicles capable of running on E85 and other high ethanol fuels can be certified and brought into use.
Read the full explanation →How many thematic areas does ESTIC 2026 cover?
The conclave covers twelve key thematic areas, which include System and Synthetic Biology, advanced manufacturing, energy technologies, artificial intelligence, semiconductors and advanced healthcare, and the whole exercise is tied to the vision of Viksit Bharat 2047.
Read the full explanation →Who was the Chief Guest at the ESTIC 2026 curtain raiser hosted by ICGEB New Delhi?
He graced the curtain raiser as Chief Guest, spoke of India's growing scientific capabilities and the potential of biotechnology to drive national development, and cited the development of COVID-19 vaccines as an instance of basic biological research leading to life-saving innovation.
Read the full explanation →Which body is organising the Emerging Science, Technology and Innovation Conclave (ESTIC 2026)?
ESTIC 2026 is a flagship national platform organised by CSIR under the guidance of the Office of the Principal Scientific Adviser to the Government of India, and it is scheduled for 27 to 29 October 2026 at Bharat Mandapam in New Delhi.
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