SSC CHSL GK Questions 2026

A seismograph holds a heavy mass that tends to stay still while the ground and the frame of the instrument move during a tremor; the relative motion is magnified and traced as a seismogram, from which the arrival times of the primary, secondary and surface waves are read.

In 1895, while working with a discharge tube, Roentgen found an unknown radiation that passed through cardboard and flesh but was stopped by bone and metal, and made a screen coated with a fluorescent salt glow.

In 1928 Fleming noticed that a mould of the genus Penicillium which had contaminated a culture plate in his London laboratory had killed the staphylococcus bacteria around it, and he named the active substance penicillin.

A fathometer, also called an echo sounder, sends a pulse of sound from the hull of a ship to the sea floor and times the returning echo; since the speed of sound in sea water is known, the time gives the depth.

A lactometer is a floating instrument that measures the relative density of milk. Pure milk has a density slightly greater than that of water, so adding water lowers the reading and the float sinks deeper, which is how dilution is detected.

A barometer measures the pressure of the atmosphere, and the mercury barometer invented by Evangelista Torricelli in 1643 does so by balancing the weight of the air against a column of mercury about 76 centimetres high at sea level.

Elektron is the Greek name for amber, the fossilised tree resin which the ancient Greeks found would attract straw, feathers and bits of dust after being rubbed with fur.

Working independently in the 1830s, Michael Faraday in England and Joseph Henry in the United States showed that a changing magnetic flux through a circuit sets up an electromotive force in it, and that the effect depends on the rate of change of flux rather than on the flux itself.

In 1932 Chadwick bombarded beryllium with alpha particles and showed that the highly penetrating radiation given off consisted of neutral particles with almost the same mass as a proton.

In 1897 Thomson passed an electric discharge through a gas at very low pressure and showed that the cathode rays produced were a stream of identical negatively charged particles, far lighter than any atom and the same whatever gas or electrode was used.

Its full name is the Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act, and it recognises individual rights over land that such families were cultivating, community rights over grazing grounds and water bodies, and rights over minor forest produce, while making the gram sabha the authority…

The Forest Survey of India divides forest cover by the proportion of ground shaded by the tree canopy.

The Forest Survey of India, set up in 1981, has its headquarters at Dehradun in Uttarakhand, the city that is also home to the Forest Research Institute and the Indira Gandhi National Forest Academy, which makes Dehradun the centre of forestry work in the country.

In the early 1970s, in the Arabari range of the Midnapore district of West Bengal, foresters stopped treating villagers as encroachers and instead gave them a share in the protection and in the produce of a degraded sal forest; the forest recovered remarkably, and the experiment became the model for…

The National Forest Policy of 1952 laid down that about thirty-three per cent of the country's geographical area should carry forest or tree cover, and it broke that national figure into about sixty per cent for the hill and mountain regions, where slopes must be held against erosion and landslides…

The Appiko movement started in 1983 in the Uttara Kannada district of Karnataka, in the Western Ghats, where villagers walked into the forest and hugged trees marked for felling by contractors; Panduranga Hegde organised it after studying the Chipko movement of the Himalaya.

Van Mahotsav is observed in the first week of July, which is chosen because the monsoon has arrived over most of the country by then and a newly planted sapling has the best chance of surviving.

The movement began in 1973 in the Chamoli district of the Garhwal Himalaya, which was then part of Uttar Pradesh and has been in the new State of Uttarakhand since 2000.

Successive assessments by the Forest Survey of India have placed Madhya Pradesh first among the States in the absolute area under forest cover, a position it owes to its very large size and to the extensive teak and sal forests of the Satpura, Vindhya and Baghelkhand tracts.

The Bishnoi community of western Rajasthan follows the twenty-nine tenets laid down by Guru Jambheshwar in the fifteenth century, several of which forbid the felling of green trees and the killing of animals, and it is for this reason that khejri groves and herds of blackbuck survive in the desert…