RRB NTPC GK Questions 2026

Trained as a physicist, she turned to agriculture and founded Navdanya, a network of community seed banks that collects, stores and freely exchanges traditional varieties of rice, millet, pulses and oilseeds, and that campaigns against the patenting of seed and of plants long used in India.

The Tawa project on a tributary of the Narmada in Hoshangabad district of Madhya Pradesh brought canal irrigation to black cotton soil that already held water well.

From the late nineteen seventies Jadav Payeng planted saplings year after year on a bare, eroding sandbar of the Brahmaputra near Majuli, and the patch grew into a forest of several hundred hectares that is now called the Molai forest after him.

In 1982 the government proposed to convert the natural sal forests of Singhbhum, then in Bihar and now in Jharkhand, into plantations of teak, which fetches a far higher price as timber.

He carried the Chipko message on foot across the Himalaya and summed up its argument in the phrase that ecology is permanent economy, meaning that a standing forest yields soil, water and pure air for ever while felled timber yields money once.

Through the Tarun Bharat Sangh he revived the johad, the traditional crescent-shaped earthen check dam, across the dry Alwar district of Rajasthan.

At Khejarli near Jodhpur in 1730, the men of the Maharaja of Jodhpur came to fell khejri trees for lime kilns needed to build a new palace.

The Kerala State Electricity Board proposed a hydroelectric dam across the Kunthipuzha river in Palakkad district, which would have submerged a tract of undisturbed tropical evergreen rainforest and the habitat of the lion-tailed macaque.

She has led the Narmada Bachao Andolan since it took shape in 1985 against the Sardar Sarovar and other large dams on the Narmada, arguing that the displaced, many of them tribal, were never given land or proper rehabilitation.

The Appiko movement began in 1983 at Salkani village in the Sirsi taluk of Uttara Kannada district, in the Western Ghats of Karnataka, under Pandurang Hegde.

The movement began in 1973 at Mandal village in Chamoli district of the Garhwal Himalaya, then part of Uttar Pradesh and today in Uttarakhand.

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.

A computer works with digital signals, a series of ones and zeros, while an ordinary telephone line was built to carry an analog voice signal.

The RJ-45 is the eight-position modular plug crimped on to the end of an unshielded twisted pair cable of category 5e or 6 and pushed into the network port of a computer, switch or router.

A walkie-talkie allows both parties to speak and both to listen, so communication is two-way, but the set has a single push-to-talk switch and one person must release it before the other can be heard.

Electromagnetic interference acts on moving charge, so any medium that carries a signal as an electric current can pick up noise from motors, fluorescent lamps, lightning and nearby cables.

The fibre has a core of higher refractive index surrounded by a cladding of lower refractive index. Light that enters the core and meets the boundary at an angle greater than the critical angle is reflected entirely back into the core, with none of it refracted away into the cladding.

In frequency division multiplexing each channel is given its own slice of the frequency band, and a small unused strip called a guard band is left between two neighbouring channels so that one does not spill into the next.