NDA GK Questions 2026

Streptococcus mutans turns dietary sugar, especially sucrose, into a sticky slime that glues it to the teeth. The bacterium makes enzymes called glucosyltransferases that join the glucose units of sucrose into sticky chains called glucans.

These three oxides, made by heating limestone with clay, form the compounds that make cement set and harden. Portland cement was patented by Joseph Aspdin in England in 1824, and named after Portland stone, which the set cement resembled.

The weight we feel is really the push of the floor on us, and in orbit that push disappears. The space station and the astronaut are both in free fall around the Earth.

In 1611 the English East India Company opened its first factory on the east coast at Masulipatam, the chief port of the Golconda kingdom.

A thermocouple has no liquid that can freeze, so suitable types can read temperatures far below −200°C. A thermocouple is made of two wires of different metals joined at a junction.

Kepler's third law says the square of a planet's orbital period is proportional to the cube of the semimajor axis of its orbit.

A convex lens forms an image at the same distance as the object only when the object sits at 2f, and here 2f works out to 4R/3.

The correct answer is B, Pavapuri, in Nalanda district of Bihar, where a marble temple stands in a lotus tank at the spot held to be the place of his nirvana; Diwali is observed by Jains as the anniversary of that event.

The Torah, the first five books of the Hebrew scripture, is kept as a scroll in the synagogue and read aloud in worship; Judaism traces itself to Abraham and Moses and holds Jerusalem as its holy city.

The correct answer is A, the Bahai faith, founded by Bahaullah in nineteenth century Persia, whose scripture is the Kitab-i-Aqdas and whose Indian house of worship is the marble building at New Delhi shaped like a lotus in bloom, open to people of every religion and holding no images.

The migration of the Prophet Muhammad and his followers from Mecca to Medina in the year 622 is called the Hijra, and the Islamic lunar calendar counts its years from it, which is why its years are marked Hijri.

The correct answer is B, Confucius, the Chinese teacher whose conversations and sayings were gathered by his disciples into the Analects, a work on duty, family order, learning and good government that shaped Chinese official life for centuries.

The correct answer is B, agiary, the Parsi fire temple in which a consecrated flame is kept burning as the symbol of truth and purity; the highest grade of such a temple is called an Atash Behram, and most of them in India are in Gujarat and Mumbai, where Parsi…

The correct answer is A, Rishabhanatha, also called Adinath, the first of the twenty-four Tirthankaras of the present age, whose symbol is the bull and who is mentioned even in some Hindu texts.

The correct answer is C, Guru Arjan Dev, the fifth Guru, who compiled the Adi Granth in 1604 and installed it in the Harmandir Sahib at Amritsar.

The correct answer is B, Zoroastrianism, the faith founded by Zoroaster in ancient Persia and followed in India by the Parsis, whose place of worship is the fire temple or agiary and whose scripture is the Zend Avesta.

The correct answer is C, Sarnath, near Varanasi, where the Buddha preached to his first five disciples in the deer park; the event is called the Dharmachakrapravartana, the turning of the wheel of law, and it is from the Sarnath lion capital that India took its state emblem.

The Tripitaka, meaning three baskets, is the Buddhist canon written in Pali and divided into the Vinaya Pitaka on monastic discipline, the Sutta Pitaka of the Buddha's discourses and the Abhidhamma Pitaka of philosophical analysis.

Subrahmanyan Chandrasekhar showed that a white dwarf, which is supported against gravity by the pressure of degenerate electrons, cannot have a mass greater than about 1.4 times the mass of the Sun; beyond that limit the star collapses further, and the work brought him the Nobel Prize in Physics in…

India's first satellite was named after the ancient astronomer and mathematician Aryabhata, was built by the Indian Space Research Organisation and was launched in April 1975 from the Soviet Union, since India had no launch vehicle of its own at the time; it carried experiments in X-ray astronomy and solar…