SSC CGL GK Questions 2026

The Earth's orbit is a slight ellipse, and it reaches aphelion, its greatest distance of about 152 million kilometres, in early July, while perihelion, its least distance of about 147 million kilometres, comes in early January.

The Gregorian cycle of 400 years contains 97 leap years, so it holds 146,097 days, and dividing that by 400 gives exactly 365.2425 days for the mean year.

The Calendar Reform Committee, set up under the chairmanship of the physicist Meghnad Saha, recommended a unified national calendar, and the Saka calendar was adopted with effect from 22 March 1957, which was the first day of Chaitra in the Saka year 1879.

Twice a year, about 21 March and about 23 September, the Sun's vertical rays fall on the Equator, the circle of illumination passes through both poles, and day and night are of equal length over the whole Earth, which is what the Latin root of the word equinox, meaning equal…

On this date, the June solstice, the Sun's rays fall vertically on the Tropic of Cancer at 23.5 degrees north, so the Northern Hemisphere receives its longest day and shortest night while the Southern Hemisphere has its shortest day.

Move forward one year at a time, adding one odd day for an ordinary span and two when a 29 February falls inside it.

A year repeats another year's calendar when the odd days between them add up to a multiple of seven and both years are of the same kind, ordinary or leap.

The Julian calendar, in use from 46 BC, assumed a year of exactly 365.25 days, which is about eleven minutes longer than the true tropical year of roughly 365.2422 days, so it gained a day about every 128 years and the equinox slid out of place.

Under the Gregorian rule a year divisible by four is a leap year, but a century year is a leap year only if it is also divisible by 400.

Thursday, 4 October 1582 was followed immediately by Friday, 15 October 1582, so ten dates vanished while the sequence of weekdays continued unbroken; the correction was needed because the Julian year of 365.25 days was about eleven minutes too long and had pushed the spring equinox ten days out of…

He issued the bull Inter gravissimas in February 1582 and the new calendar took effect that October, correcting the drift that had built up in the older system and tightening the rule for leap years.

Portable Network Graphics applies the deflate algorithm, which rearranges and encodes the pixel data without discarding any of it, so the decompressed image is identical to the original, pixel for pixel; it also supports an alpha channel for partial transparency.

Blender is a free and open-source suite in which an artist builds three dimensional models, applies materials and lighting, animates them along a timeline and then renders the frames into a finished image or film; it also carries sculpting, simulation and video editing tools.

The number of colours a pixel can hold is two raised to the power of its bit depth, so eight bits give two to the eighth, that is 256 possible values.

MIDI stands for Musical Instrument Digital Interface, a standard of the early nineteen eighties by which synthesisers, keyboards and computers exchange messages about which note begins, how hard it is struck, how long it lasts and which instrument voice should sound.

CMYK stands for cyan, magenta, yellow and key or black, and it is a subtractive model: the inks sit on white paper and subtract wavelengths from the light falling on it, so adding all of them together moves the result towards black.

In computer graphics the three basic two-dimensional transformations are translation, rotation and scaling.

Scalable Vector Graphics stores a picture as mathematical descriptions of lines, curves and shapes written in XML, so the browser redraws it at whatever size is asked for and the edges stay perfectly sharp.

PSD, the Photoshop Document, keeps every layer, mask, channel and adjustment separately so that the artist can go back and change any of them, which an exported JPEG or PNG cannot do because those flatten the picture into one grid of pixels.

MPEG stands for Moving Picture Experts Group, and the group defined three audio layers of rising complexity within its MPEG-1 standard; the third layer gave the file extension.mp3.