SSC CHSL GK Questions 2026

When a material becomes superconducting it pushes the magnetic field out of its interior and behaves as a perfect diamagnet, an effect reported by Meissner and Ochsenfeld in 1933; it is the reason a small magnet can be made to hover above a cooled superconductor, as in magnetic levitation demonstrations.

The Dutch physicist Kamerlingh Onnes, who had already succeeded in liquefying helium, cooled mercury with it in 1911 and found that its electrical resistance disappeared completely below about 4.2 kelvin, the first observation of superconductivity.

Coherence means that the waves in the beam keep a constant phase relationship, so crest marches with crest; this is a direct result of stimulated emission, since each new photon is emitted in phase with the photon that caused it, and it is what makes holography and interference work with…

Maiman built the first operating laser in 1960, using a rod of synthetic ruby, that is chromium ions in aluminium oxide, pumped by a flash lamp, and it emitted pulses of deep red light.

The device works by stimulated emission, in which a photon passing an excited atom makes it fall to a lower level and emit a second photon identical in frequency, phase and direction, so one photon becomes two and the light is amplified.

The work function of a metal is the least energy needed to free an electron from its surface, and it is equal to Planck's constant multiplied by the threshold frequency of that metal; caesium and potassium have low work functions, which is why they respond to visible light.

By Einstein's photoelectric equation, the photon gives energy equal to Planck's constant times the frequency, part of which is spent as the work function, so the maximum kinetic energy left with the electron rises with frequency and is independent of how bright the light is.

The citation for the prize refers to his services to theoretical physics and especially to his discovery of the law of the photoelectric effect, the equation in which the energy of a photon equals the work function plus the maximum kinetic energy of the emitted electron.

In 1887, while studying the sparks produced across a gap between two electrodes, Hertz noticed that the spark passed more easily when ultraviolet light fell on the electrodes, which was the first observation of the photoelectric effect; Hallwachs and Lenard then studied it systematically.

The Charter of the United Nations was drawn up at the United Nations Conference on International Organization held in San Francisco, USA, from April to June 1945, and was signed there on 26 June 1945.

World Humanitarian Day is marked every year on 19 August to honour aid workers who have been killed or injured while helping others, and to draw attention to people affected by crises.

The order constituting the committee sets that period and also requires the panel to complete the consultative process it has been asked to undertake before submitting its recommendations.

The code was introduced in that year as a voluntary, industry-led self-regulatory mechanism meant to promote ethical pharmaceutical marketing and to regulate the interactions between pharmaceutical companies and healthcare professionals.

The correct answer is Dr. M. Srinivas, a Member of NITI Aayog, who has been named the Chairperson of the committee set up by the Department of Pharmaceuticals to examine the framework governing pharmaceutical marketing practices.

He won the bronze in the Men's 100m T44 sprint, and the Prime Minister noted that adding this medal to his gold-winning world record performance in the 400m made it a memorable campaign for him at these Games.

Nimisha Chakkungalparambil Suresh finished second in this event and the Prime Minister said that her dedication and hard work had brought another proud moment for Indian para athletics, wishing her well for future competitions.

He defended the title he already held in the Men's Club Throw F51 and set a fresh Games Record while doing so, which is why the Prime Minister called the achievement a source of pride for the nation.

India filled all three places on the podium in this event: Sumit won the gold medal, Mahendra Gurjar took the silver with a Games Record and Sandip Sanjay Sargar claimed the bronze, also with a Games Record.

The 2015 film 'The Man Who Knew Infinity' tells the life of the Indian mathematician Srinivasa Ramanujan and is based on Robert Kanigel's 1991 biography of the same name.

B cells and T cells are lymphocytes, the white blood cells of the adaptive immune system that recognise and fight specific bacteria, viruses and other pathogens.