NDA GK Questions 2026

Prachand is the Light Combat Helicopter developed and built by Hindustan Aeronautics Limited, designed to operate from high-altitude bases, which makes it suited to the Siachen and Ladakh sectors where few attack helicopters can carry a useful load.

Rafale is a twin-engine multirole fighter made by Dassault Aviation, the same French company that made the Mirage 2000 flown by India since the 1980s, and the first Indian Rafale squadron was raised at Ambala.

INS Arihant was built under the Advanced Technology Vessel programme and commissioned in 2016; because it carries ballistic missiles, the K-15 Sagarika among them, it completed India's nuclear triad, that is the ability to launch a nuclear weapon from land, from the air and from the sea.

The Kalvari class are conventional diesel-electric attack submarines built at Mazagon Dock Shipbuilders in Mumbai to the Scorpene design under a transfer of technology, and the class includes INS Kalvari, Khanderi, Karanj, Vela, Vagir and Vagsheer.

Tejas is a single-engine multirole fighter designed by the Aeronautical Development Agency and manufactured by Hindustan Aeronautics Limited, the public sector company that also builds the Dhruv helicopter, the Prachand light combat helicopter and the Su-30MKI under licence at Nashik.

The indigenous aircraft carrier, commissioned in September 2022 as INS Vikrant, was designed by the Navy's own design organisation and built at Cochin Shipyard in Kerala, which made India one of the few countries able to build a carrier.

The molecules of the atmosphere are much smaller than the wavelength of visible light, and such particles scatter short wavelengths far more strongly than long ones.

In hypermetropia the eye lens is too weak or the eyeball is too short, so rays from a nearby object are not converged enough and the image falls behind the retina.

The retina carries two kinds of photoreceptor. Cone cells need reasonably bright light to work and respond selectively to different wavelengths, so they give us the sensation of colour; when the cones are defective a person is colour blind.

The refractive index of a transparent medium is not the same for every colour; it rises as the wavelength falls.

Two steps are needed. First, the focal length must be converted to metres: 50 centimetres is 0.5 metre.

The power of a lens measures how strongly it converges or diverges light, and it is defined as one divided by the focal length expressed in metres.

The least distance of distinct vision, also called the near point, is the smallest distance at which an object can be held and still be seen clearly without strain.

The iris is the coloured ring of muscle lying just behind the cornea. By contracting and relaxing it makes the central opening, the pupil, smaller in bright light and larger in dim light, and in this way it regulates how much light falls on the retina.

A soap film is extremely thin, and light reflected from its front surface meets light reflected from its back surface.

The cornea is the thin, transparent, slightly bulging membrane that forms the front surface of the eyeball, and light must pass through it before reaching anything else.

Myopia, or short-sightedness, is the defect in which nearby objects are seen clearly but distant objects look blurred. It arises either because the eye lens has become too converging, that is its focal length is too short, or because the eyeball has grown too long from front to back.

He is credited with the Samaranganasutradhara on architecture and mechanics and the Saraswatikanthabharana on poetics, and with the Bhojashala at Dhar and the great lake and Shiva temple at Bhojpur.

The Chandelas ruled Jejakabhukti, the Bundelkhand region, from Khajuraho and Mahoba, and built the Khajuraho group of temples in the Nagara style between about 950 and 1050; the Lakshmana temple belongs to Yasovarman, the Vishvanatha temple to Dhanga and the great Kandariya Mahadeva temple to Vidyadhara.

In the First Battle of Tarain in 1191 Prithviraja III of Ajmer defeated Muhammad Ghori, who was wounded and carried from the field.