NDA GK Questions 2026

Carborundum, or silicon carbide (SiC), is one of the hardest substances known, so it can grind, cut and polish other materials, which is what an abrasive must do.

Too little fluoride in drinking water leaves tooth enamel weak, so teeth decay more easily and develop cavities, called dental caries.

The inner planets are the four that orbit the Sun inside the asteroid belt: Mercury, Venus, Earth and Mars. The asteroid belt between Mars and Jupiter divides the solar system into two groups.

At spring tide the pulls of the Sun and the Moon add up, so the tidal range is at its greatest.

Potassium carbonate comes from a strong base and a weak acid, so statement 1 is wrong, while statements 2 and 3 are right.

When water is short, leaves make more abscisic acid (ABA), which makes the guard cells lose water and close the stomata, so the plant loses less water through transpiration.

Every biological molecule, from sugars and fats to proteins and DNA, is built on a skeleton of carbon atoms, which is why carbon is called the basic building block of life.

In the southern hemisphere the Coriolis force turns winds to the left, not the right. The Coriolis force is an apparent force caused by the Earth's rotation.

A hydrogen bomb fuses light hydrogen nuclei, while a uranium bomb splits heavy uranium-235 nuclei. In nuclear fission a heavy nucleus such as uranium-235 absorbs a neutron and splits into two lighter nuclei, releasing energy and two or three more neutrons.

The nucellus is the diploid tissue of the ovule itself, while the synergids, the egg and the antipodals are haploid cells of the embryo sac.

Antarctica is the highest continent on average, and Mount Vinson is its highest peak. Antarctica's average elevation is about 2,500 metres, far above that of any other continent; Asia, the next highest, averages under 1,000 metres.

Both were killed in 1942 during the Quit India Movement, Matangini Hazra in Bengal and Lakshman Naik in Odisha. The Quit India Movement began after the Congress passed the Quit India resolution in Bombay on 8 August 1942, with Gandhi's call of 'Do or Die'.

The base is made thin and lightly doped so that most charge carriers from the emitter cross it to the collector.

Flint glass contains lead oxide, which gives it a high refractive index and clarity, so it is used for lenses and prisms of optical instruments.

Lysosomes bud off from the Golgi apparatus as small membrane-bound sacs packed with digestive enzymes. The hydrolytic enzymes of a lysosome are first made on ribosomes attached to the rough endoplasmic reticulum.

The Sea of Azov joins the Black Sea through the narrow Kerch Strait, east of the Crimean peninsula. The Sea of Azov is bordered by Russia and Ukraine and is often called the shallowest sea in the world, with a maximum depth of only about 14 metres.

In a centripetal pattern streams flow inward from all sides into a central lake or basin, like spokes pointing to a hub.

For resistors in parallel the reciprocals add: 1/11 + 1/22 + 1/33 = 11/66 = 1/6, so the equivalent resistance is 6 Ω. Taking 66 as the common denominator, 1/11 becomes 6/66, 1/22 becomes 3/66 and 1/33 becomes 2/66.

Rhizopus, the bread mould, feeds on dead and decaying organic matter, which is exactly what a saprophyte does. A saprophyte gets its food by releasing digestive enzymes onto dead matter such as stale bread, fruit or leaf litter and then absorbing the simple nutrients that result.

Jordan lies north of the peninsula in the Levant, while Kuwait, Oman and Yemen are all on the Arabian Peninsula.