Correct answers are highlighted in green. Click on the correct answer for further reading on the topic.
Sci-Five | The Hindu Science Quiz: on fundamental forces and gravity
This artist’s concept released October 30, 2017 shows a black hole with an accretion disk - a flat structure of material orbiting the black hole – and a jet of hot gas, called plasma. NASA/JPL-Caltech/Handout
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1 / 5 |
Of the four fundamental forces of nature, these are three – electromagnetic, gravitational, strong nuclear forces. What is the fourth?
- Electroweak
- Weak nuclear
- Weak gravitational
- Frictional
Weak Nuclear force – This is a force that is responsible for radioactive decay of particles.
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2 / 5 |
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?
- Sheldon Glashow, Peter Higgs and Stephen Hawking
- Sheldon Glashow, Abdus Salam and Steven Weinberg
- Albert Einstein, James Franck and Gustav Hertz
- None of the above
Sheldon Glashow, Abdus Salam and Steven Weinberg were awarded for unifying electromagnetic and weak interactions.
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3 / 5 |
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?
- Light particle
- Field quantum
- Gauge boson
- Higgs boson
Gauge bosons act as intermediaries in bringing about various interactons.
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4 / 5 |
Before they came to be known as black holes, these objects were named after the first person to envision them. What is this term?
- Schwarzschild singularity
- Event horizon
- Naked singularity
- None of the above
Schwarzschild singularity: Soon after Einstein published his equations of general theory of relativity, Karl Schwarzschild found a solution such that when matter was confined within a small radius, there would be a point within of infinite curvature and density. This later developed into the idea of a black hole.
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5 / 5 |
What is the surface around a black hole that represents the distance of approach beyond which even light cannot escape?
- Caustic curve
- Potential surface
- Event Horizon
- None of the above
Event Horizon. If an object or particle enters the event horizon surrounding a black hole, it cannot ever escape the gravitational pull of the black hole.
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