General Science is the knowledge section of RRB ALP under CEN 01/2026. The CEN defines it as Physics, Chemistry and Life Sciences of Class 10 level in CBT-1, and CBT-2 Part A adds Basic Science and Engineering: units and measurements, mass, weight and density, work, power and energy, speed and velocity, heat and temperature, basic electricity, levers and simple machines, engineering drawing, occupational safety and health, environment education and IT literacy. The notes on this page are GK24's topic-wise GK notes for RRB ALP, written as short facts, formulas and tables so that a topic can be revised in one sitting. Physics notes cover motion, force, gravitation, work and energy, sound, light, electricity and magnetism; Chemistry notes cover matter, atoms and molecules, chemical reactions, acids, bases and salts, metals and non-metals, carbon compounds and the periodic table; Life Sciences notes cover the cell, life processes, control and coordination, reproduction, heredity, diseases and the environment. Topics that appear in both CBT-1 General Science and CBT-2 Basic Science and Engineering, such as units, energy, heat and electricity, are marked so that one reading serves two papers. Each note ends with the previous-year questions asked on it, and the quizzes on this site draw from the same topics, so a weak quiz score points back to the note to reread.
The dimensions of force are:
Newton's second law gives force = mass × acceleration. Mass has the dimension [M], and acceleration is velocity divided by time, that is [L T⁻¹] ÷ [T] = [L T⁻²].
Read the full explanation →Water has the highest density at nearly ______ Kelvin.
Water is densest at about 4 degrees Celsius, and 4 plus 273 gives roughly 277 kelvin. Most liquids keep shrinking as they cool, but water behaves oddly: below 4 degrees Celsius it starts to expand again because its molecules begin forming the open, hexagonal pattern of ice.
Read the full explanation →Which of the following is an element with atomic number 30 as per the modern periodic table?
Zinc has atomic number 30, meaning every zinc atom has 30 protons in its nucleus. It is the last element of the first transition series in period 4 of the modern periodic table, with the electronic configuration [Ar] 3d10 4s2, and it is placed in group 12.
Read the full explanation →Which of the following devices is used to measure relatively high temperatures, such as encountered in furnaces?
A pyrometer measures very high temperatures, such as those of furnaces, kilns and molten metal, without touching the hot object.
Read the full explanation →Beriberi is a disease caused due to deficiency of ________
Beriberi is caused by a lack of thiamine, which is vitamin B1. Thiamine helps the body turn carbohydrates into energy and keeps nerves and the heart working, so its shortage weakens muscles and nerves (dry beriberi) or causes swelling and heart failure (wet beriberi).
Read the full explanation →People with which of the following blood groups are considered as the universal recipient?
A person with AB positive blood can receive red cells from every ABO and Rh group, so AB+ is called the universal recipient.
Read the full explanation →After the regularisation of 14 services in August 2026, how many Amrit Bharat services are in operation?
During August 2026 fourteen Amrit Bharat services were converted from special trains into regular trains, and that conversion took the total number of Amrit Bharat services to this figure.
Read the full explanation →What was the cumulative number of commissioned Gati Shakti Cargo Terminals as on 31 August 2026?
Five new Gati Shakti Cargo Terminals were commissioned during August 2026, which took the cumulative count to this figure at the end of the month.
Read the full explanation →How much freight did Indian Railways load in August 2026?
Indian Railways loaded that quantity during August 2026 and recorded a year-on-year growth of 5.4 per cent. Freight revenue in the same month rose by 6.27 per cent over the corresponding month of the previous year, which shows that the freight business strengthened in value as well as in volume.
Read the full explanation →Which work was sanctioned at a cost of ₹233 crore?
The work replaces existing panel interlocking with Electronic Interlocking, which is computer-based signalling in place of ageing relay-based systems, giving higher reliability, quicker fault diagnosis, easier maintenance and greater operational flexibility, besides supporting the roll-out of Kavach.
Read the full explanation →The new bypass line between Adra and Joychandipahar is part of which corridor?
The bypass of 11 km, sanctioned at ₹272 crore in South Eastern Railway, will separate train paths and provide a two-way connection to a third line that is planned on the route.
Read the full explanation →Kavach is best described as which kind of system?
The release sets out four things it does, and each of them is worth remembering separately because questions are framed on them.
Read the full explanation →Kavach Version 4.0 has been sanctioned for the remaining sections of which railway division?
Indian Railways approved Kavach Version 4.0 on the sections of this division that were still without the system, covering 712 route kilometres at a total cost of ₹170 crore.
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