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Special and General Relativity Quiz
RF Cafe Quiz #82

RF Engineering Quizzes - RF Cafe WebsiteAll RF Cafe Quizzes make great fodder for employment interviews for technicians or engineers - particularly those who are fresh out of school or are relatively new to the work world. Come to think of it, they would make equally excellent study material for the same persons who are going to be interviewed for a job. Bonne chance, Viel Glück, がんばろう, buena suerte, удачи, in bocca al lupo, 행운을 빕니다, ádh mór, בהצלחה, lykke til, 祝你好運. Well, you know what I mean: Good luck!

Click here for the complete list of RF Cafe Quizzes.

Note: Some material based on books have quoted passages.

Quiz #82: Special and General Relativity - RF CafeEinstein's theories of relativity revolutionized our understanding of space, time, and gravity. Special Relativity (1905) rests on two postulates: the laws of physics are the same in all inertial frames, and the speed of light in vacuum is constant for all observers. From these flow time dilation, length contraction, relativistic mass, and the famous equation E=mc². General Relativity (1915) extends these ideas to include acceleration and gravity by treating gravity not as a force but as the curvature of spacetime caused by mass and energy. The equivalence principle - that gravitational acceleration is locally indistinguishable from inertial acceleration - is its cornerstone. Importantly, General Relativity fully subsumes Special Relativity: in regions where gravity is negligible (flat spacetime), GR reduces exactly to SR. All SR predictions hold within GR as a limiting case. This quiz tests key concepts from both theories, including the twin paradox, gravitational time dilation, black holes, and the experimental evidence that confirmed them. Whether you are a physics student or a curious mind, these questions will sharpen your grasp of the most profound ideas in modern physics.


1. In Special Relativity, what happens to the length of an object moving relative to an observer?






2. Which principle states that no experiment can distinguish between a uniform gravitational field and constant acceleration?






3. In Special Relativity, if two events are simultaneous in one inertial frame, are they simultaneous in all frames?






4. According to General Relativity, what causes the phenomenon we perceive as gravity?






5. The twin paradox involves one twin traveling at high speed and returning younger. Which effect explains this?






6. Which of the following is a prediction of General Relativity that was confirmed by Eddington's 1919 expedition?






7. In Special Relativity, the relativistic momentum of a particle increases without bound as its speed approaches:






8. Which property of time is predicted by General Relativity near a massive object?






9. According to Special Relativity, the mass of an object at rest is 1 kg. If it moves at 0.866c, its relativistic mass is approximately:






10. Does General Relativity fully incorporate all principles of Special Relativity?






Quizzes from vintage electronics magazines (and many custom RF Cafe-generated quizzes) such as Popular Electronics, Electronics-World, QST, Radio-Electronics, and Radio News were published over the years - some really simple and others not so simple. Robert P. Balin created most of the quizzes for Popular Electronics. This is a listing of all I have posted thus far.

RF Cafe Quizzes

Vintage Electronics Magazine Quizzes

Vintage Electronics Magazine Quizzes
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About the RF Cafe™ Website ©1996-2026

Kirt Blattenberger - RF Cafe WebmasterRF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a lady's voice announced "You've Got Mail" when a new message arrived...

Webmaster: Kirt Blattenberger  |     BSEE - KB3UON - AMA92498  |  USAF Radar Technician

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