RRB Group D GK Questions 2026

Amplitude is the maximum displacement of a particle of the medium from its rest position, and the energy carried by a wave increases with the square of the amplitude.

Convert the units first: 1 kilohertz is 1000 hertz and 50 centimetres is 0.5 metre. The speed is frequency multiplied by wavelength, that is 1000 multiplied by 0.5, which gives 500 metres per second.

Pitch is the characteristic of a sound by which the brain judges it as shrill or flat, and it is decided by the frequency of the wave.

The speed of a wave is the product of its frequency and its wavelength, so the speed here is 50 hertz multiplied by 4 metres, that is 200 metres per second.

The Fourth Buddhist Council met in Kashmir under the patronage of the Kushana ruler Kanishka I. Vasumitra presided over it and Ashvaghosha acted as his deputy, and its work of collecting commentaries on the canon went with the open division of Buddhism into the Mahayana and Hinayana schools.

The Nasik cave inscription praising Gautamiputra Satakarni was issued in the name of his mother Gautami Balashri, in the reign of her grandson.

Milindapanho means the questions of Milinda, and Milinda is the Indian name of the Indo-Greek king Menander, who ruled in the north-west in the second century BCE.

The Junagadh rock inscription of about 150 CE was issued by Rudradaman I, the Shaka ruler of the Western Kshatrapa line.

Brihadratha was the last ruler of the Mauryan dynasty. About 185 BCE his own commander-in-chief Pushyamitra Sunga killed him, according to tradition at a review of the army, and took the throne at Pataliputra.

The panel showing the submission of the mad elephant Nalagiri, sent by Devadatta to kill the Buddha and calmed by him in the street of Rajagriha, is among the best known carvings of the Amaravati stupa on the lower Krishna in Andhra Pradesh.

The Gathasaptasati, also written as Gatha Saptasati, is an anthology of seven hundred short verses compiled by the Satavahana king Hala.

Ashvaghosha was a Buddhist monk and Sanskrit poet at the court of the Kushana ruler Kanishka I. He wrote the Buddhacharita, a life of the Buddha in Sanskrit verse, and the Saundarananda, and he acted as deputy to Vasumitra at the Fourth Buddhist Council held in Kashmir.

Nahapana belonged to the Kshaharata family of the Shakas, the Western Kshatrapas who ruled in western India, and not to the Kushanas at all.

The main Kushana capital was Purushapura, the modern Peshawar, which Kanishka I developed as his seat of power. As the empire spread into the Ganga-Yamuna plain, Mathura on the Yamuna became its second capital and the southern headquarters of the family.

El Nino is the periodic warming of the surface water of the central and eastern Pacific off the coast of Peru and Ecuador, and the name, meaning the child, was given by fishermen because it appears around Christmas.

These are low pressure systems, that is temperate cyclones, which form over the Mediterranean and the Caspian region and travel eastwards with the westerly jet stream.

These are the violent evening thunderstorms of the months before the monsoon in West Bengal, Bihar, Jharkhand and Assam, and the name means the calamity of the month of Baisakh because the squalls can flatten huts and trees.

Mawsynram lies in the Khasi hills, and the neighbouring Cherrapunji, now called Sohra, stands close behind it.

The south-west monsoon normally sets in over the Kerala coast about the first of June, and the sudden heavy downpour that marks its arrival is called the burst of the monsoon.

In the Koeppen classification as applied to India, the semi-arid steppe climate marked BShw covers parts of Punjab, Haryana, western Uttar Pradesh and the drier interior of the peninsula, where rainfall is low but not as low as in a true desert.