Defence GK Questions 2026

The Buland Darwaza, the lofty gateway on the south side of the Jama Masjid at Fatehpur Sikri, was raised by Akbar in 1575 to mark his conquest of Gujarat.

The Qutub Minar in Mehrauli, Delhi, rises to about 72.5 metres, which is taken as 73 metres in answer keys.

The Jama Masjid of Delhi, whose formal name is Masjid-i-Jahan-Numa, was built by Shah Jahan between 1650 and 1656 as the congregational mosque of his new capital Shahjahanabad.

The Gol Gumbaz stands at Bijapur, now called Vijayapura, in Karnataka. It is the tomb of Muhammad Adil Shah of the Adil Shahi dynasty of Bijapur and was completed in the middle of the seventeenth century.

Doab, from the Persian words for two and water, is the name for the tract of land between two rivers.

The Purvanchal or Eastern Hills are the southward continuation of the Himalayas beyond the eastern bend of the Brahmaputra, and they are made up of the Patkai Bum, the Naga Hills, the Manipur Hills and the Mizo or Lushai Hills.

Majuli lies in the Brahmaputra in Assam and is counted the largest river island in the world. The Brahmaputra carries an enormous load of silt from a young, rapidly eroding basin, and because its channel is braided and shifts often, it has built large islands and sandbars called chars.

The Pir Panjal is the longest and most important range of the Lesser or Himachal Himalaya, running from the Jhelum through Jammu and Kashmir towards Himachal Pradesh and separating the Kashmir valley from the Jammu plains.

The Himalayas were raised when the northward-moving Indian plate collided with the Eurasian plate and the sediments of the shallow Tethys Sea between them were compressed into great folds and thrust upward.

Kanchenjunga rises to 8,586 metres on the Sikkim-Nepal border and is the highest peak in India's undisputed territory, as well as the third highest in the world after Everest and K2.

Nathu La lies in eastern Sikkim on the old trade route from Gangtok to Lhasa and is one of the passes on India's border with the Tibet region of China; Jelep La, also in Sikkim, is the other.

Bhangar is the older alluvial deposit of the Northern Plains. It forms terraces that stand above the present flood level, so fresh silt no longer reaches it, and long leaching has left calcareous concretions called kankar in its profile.

The Bhabar is a narrow belt about 8 to 16 kilometres wide, laid along the foot of the Shiwalik range, where the rivers leaving the hills drop their coarsest load.

Karewas are thick beds of glacial clay, silt and other lake sediments laid down in the Kashmir valley, which lies between the Pir Panjal and the Greater Himalaya.

Duns are flat-floored longitudinal valleys formed where rivers coming out of the Lesser Himalaya were held up behind the rising Shiwalik and filled the depression with gravel and silt.

The Himadri is the innermost and northernmost of the three parallel Himalayan ranges, with an average height of about 6,000 metres.

Mendeleev arranged the elements by increasing atomic mass in 1869 and left blank spaces where his pattern demanded an element that was not yet known.

After discovering the electron in 1897, J. J. Thomson pictured the atom as a sphere of positive charge with negatively charged electrons stuck in it, a picture often compared to plums in a pudding or seeds in a watermelon.

Isotopes are atoms of the same element, so they have the same number of protons and therefore the same atomic number, but they carry different numbers of neutrons, which makes their mass numbers differ.

The modern periodic table has seven horizontal rows, called periods, and eighteen vertical columns, called groups.