RRB JE GK Questions 2026

MeitY brought out the National Strategy for Additive Manufacturing in February 2022 as the guiding policy framework for 3D printing in India, keeping it aligned with Make in India and Atmanirbhar Bharat.

While the ice floats it displaces a volume of water whose weight equals the weight of the ice, by the law of flotation.

In a liquid, viscosity comes chiefly from cohesion between molecules; heating weakens that cohesion, so the layers slide past one another more easily and the viscosity falls, which is why engine oil becomes thinner as the engine warms and why honey flows freely when it is warmed.

Cohesive forces pull the molecules at the surface of a liquid inward, so the surface behaves like a stretched membrane and takes the smallest area that can enclose the given volume; for a fixed volume the shape of least surface area is a sphere, which is why a free drop…

The correct answer is B, pascal second, equal to a newton second per square metre, which follows from Newton's law of viscosity, where the shearing stress in pascals is divided by the velocity gradient in reciprocal seconds.

Pascal's law says that pressure applied to an enclosed fluid is transmitted undiminished to every part of the fluid and to the walls of the vessel, so a modest push on the brake pedal creates a pressure in the brake fluid that is passed to the wider pistons at every…

In a capillary tube the height of rise is directly proportional to the surface tension of the liquid and inversely proportional to its density and the radius of the tube.

In such a fluid the shearing stress is directly proportional to the rate of shear, so the coefficient of viscosity, which measures the resistance to deformation, keeps the same value whatever the stress applied; water, air, petrol and thin oils behave in this way.

The upthrust on a body is the resultant of the pressure forces of the fluid around it, and that resultant acts through the centre of gravity of the fluid the body has pushed aside, which is why the point is called the centre of buoyancy.

A floating body displaces its own weight of fluid, so the fraction of its volume that lies below the surface equals the ratio of its density to the density of the fluid, here 920 divided by 1000, which is 0.92.

By Archimedes' principle the upthrust on a body equals the weight of the fluid it displaces, and that weight is the volume of the body actually immersed multiplied by the density of the fluid and by the acceleration due to gravity.

Among the roles listed for ITLA is to advise and assist in the review and updating of that policy, alongside capacity building, training and skilling in the logistics sector and the promotion of research and innovation in transport and logistics.

The Cabinet decision asks ITLA to build a unified transport data repository by obtaining relevant transport and logistics datasets from several sources, among them the GSTN e-way bill, FASTag, Vahan, GPS-based systems and urban traffic management systems, and then to carry out analytics such as freight flow and origin-destination studies…

The approval gives the Integrated Transport and Logistics Authority the task of technically appraising infrastructure projects of the Government of India costing that much or more, while financial appraisal continues through the mechanisms that already exist.

Using eight optical spectra recorded at Steward Observatory in the United States during low-brightness phases of the object in October and November 2017, the team estimated the central black hole to weigh no less than that, reading the figure from the width of the oxygen emission line.

OJ 287 is a rare object lying about 4 billion light years away in which two supermassive black holes circle each other on a twelve-year orbit, forming a binary system.

The multi-institutional campaign on the blazar OJ 287 was coordinated by scientists of this institute, which is an autonomous body of the Department of Science and Technology, and the study was led by Dr Alok C. Gupta of the same institute.

A coaxial cable is built around a single solid or stranded copper wire at the axis, which carries the signal.

Infrared lies just below visible light in frequency, and like visible light it is stopped by an ordinary wall.

Transmission media fall into two families. A guided or bounded medium confines the signal to a solid conductor or light pipe, and the three guided media are twisted pair, coaxial cable and optical fibre.