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. Of the four fundamental forces of nature, these are three – electromagnetic, gravitational, strong nuclear forces. What is the fourth?
. One of the goals of particle physics is to construct a unified model of the above four forces of nature. In 1979, Nobel prize was given to three scientists for presenting a unified description of the electromagnetic and weak forces. Which of the following is the right answer?
. The photon is a particle of spin equal to one unit that mediates the electromagnetic interaction or force. What is the common name used to describe such particles that mediate other interactions such as strong interactions, weak interactions etc?
. Before they came to be known as black holes, these objects were named after the first person to envision them. What is this term?
. What is the surface around a black hole that represents the distance of approach beyond which even light cannot escape?
