RRB NTPC GK Questions 2026

The pulmonary veins carry oxygen-rich blood from the lungs into the left atrium. In double circulation, blood passes through the heart twice in each full round.

Metals produce a ringing sound when struck, a property called sonority, which is why bells are made of metal. Sonorous means 'producing a deep, ringing sound'.

Power is the reciprocal of focal length in metres, and 10 cm is 0.1 m, so P = 1 ÷ 0.1 = 10 D. The power of a lens measures how strongly it converges or diverges light.

X-rays are electromagnetic waves made of uncharged photons, so electric and magnetic fields cannot bend them. Electric and magnetic fields exert force only on charged particles: a charge q feels a force qE in an electric field and qvB in a magnetic field.

Fourth-generation computers, from about 1971, were built around the microprocessor, a whole CPU on a single chip. Computer generations are named after the main switching technology of the time.

Carbon monoxide binds with haemoglobin far more strongly than oxygen does, so the blood can no longer carry enough oxygen.

The great majority of plant viruses carry their genes as single-stranded RNA. Viruses contain either DNA or RNA, never both, wrapped in a protein coat.

India marks 21 May as Anti-Terrorism Day because former Prime Minister Rajiv Gandhi was assassinated on that day in 1991.

In ecology, a population is defined by three things together: one species, one place and one time. Ecology studies life in levels.

Cyclohexane, C 6 H 12, has 6 C–C single bonds and 12 C–H single bonds, 18 single bonds in all and no double or triple bond.

Silver and copper are the two best conductors of heat among metals. Metals conduct heat because their free electrons carry energy quickly through the solid.

Velocity multiplied by time is displacement, so the area between a velocity-time graph and the time axis gives the displacement.

A bacterium is a prokaryote, so its DNA lies in an irregular region called the nucleoid, with no nuclear membrane around it.

Photo 51 is the X-ray diffraction photograph of DNA that revealed its helical shape. The picture was taken in May 1952 at King's College London by Rosalind Franklin and her student Raymond Gosling.

Twenty crests and twenty troughs make twenty complete waves in 0.1 second, so the frequency is 200 Hz and the wavelength is 330 ÷ 200 = 1.65 m. One complete wave, or one cycle, contains one crest and one trough (for sound, one compression and one rarefaction).

Dr Anupam Sharma, Distinguished Scientist and Director General (Technology Management), said at the Bengaluru curtain-raiser that business in the semiconductor-related segment is expected to rise to 200 billion dollars by 2035.

The conclave is being organised jointly by 12 ministries and departments, and the whole exercise is guided by the Principal Scientific Adviser to the Government of India.

The Emerging Science, Technology and Innovation Conclave, shortened to ESTIC-2026, is to be held there from 27 to 29 October 2026, and DRDO will lead its thematic session on semiconductors and next-generation chips.

The correct answer is the Ministry of Communications, under which the Department of Posts functions and which announced the campaign.

Passengers on selected flights received kits containing postcards, wrote their messages during the journey at about 30,000 feet and then dropped the cards into letter boxes that India Post had kept specially at the airports where they landed, from where the cards moved into the normal postal stream for delivery.