Relativity topics include: Einstein’s special theory on relativity, lorentz transformation equations, mass energy relation and mass variation with velocity. Relativity is a theory that states that space and time are relative concepts, not absolute. It also states that all motion must be defined relative to a frame of reference. Albert Einstein's theory of relativity is made up of two interrelated theories: special relativity and general relativity. Special relativity applies to physical phenomena without gravity. General relativity, also known as Einstein's theory of gravity, is the... Show more

Relativity topics include: Einstein’s special theory on relativity, lorentz transformation equations, mass energy relation and mass variation with velocity.

Relativity is a theory that states that space and time are relative concepts, not absolute. It also states that all motion must be defined relative to a frame of reference.

Albert Einstein's theory of relativity is made up of two interrelated theories: special relativity and general relativity.

Special relativity applies to physical phenomena without gravity. General relativity, also known as Einstein's theory of gravity, is the current description of gravitation in modern physics  

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Engineering Physics Practice Test: Relativity

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25 Questions

1. Rayleigh-Jean’s law holds good for which of the following?

High energyShorter wavelengthHigh temperatureLonger wavelength

2. How fast does a rocket have to move relative to an observer for its length to be contracted to 95% of its original length?

0.5 c0.4 c0.2 c0.3 c

3. The binding energy of an electron to a proton (i.e., hydrogen atom) is 13.6 eV. The loss of mass in the formation of one atom of hydrogen is _____________

2.42 X 10-35 Kg5.19 X 10-35 Kg3.34 X 10-35 Kg4.58 X 10-35 Kg

4. Which basic law is used for the derivation of mass variation with velocity?

Law of conservation of massLaw of conservation of MomentumLaw of conservation of Kinetic EnergyLaw of conservation of Energy

5. The length of a rod seems shorter to an observer when it moves in a specific direction. What change would he observe when the direction of rod changes by 180^o?

The length of the rod remains the sameThe length of the rod increasesThe rod becomes even smallerThe rod has the length equal to its proper length

6. Which of the following is Einstein’s mass energy relation?

E2 – p2c2 = m02c4E = mc2Ek = mv2/c2Ek = (m – m0)c2

7. A rod of length 1m moves with a speed of 0.5 c. How much length contraction takes place?

50 %14 %10 %35 %

8. When a particle is moving with a velocity of light c relative to S, its velocity as observed by an observer in the frame S^’ is _____________

c0.75 c0.5 cZero

9. A man, who weighs 60 kg on earth, weighs 61 kg on a rocket, as measured by an observer on earth. What is the speed of the rocket?

5.5 X 108 m/s2.5 X 107 m/s5.5 X 107 m/s2.5 X 108 m/s

10. The orbit of mercury is changing slightly due to the sun’s gravity.

Don't knowFalseMaybeTrue

11. As an object approaches the speed of light, it’s mass becomes _____________

InfiniteDoubleZeroRemains Same

12. The rest mass of a photon is equal to ___________

Inertial massRelativistic massZeroGravitational mass

13. Two particles approach each other with a velocity of 0.9 c. What is their relative velocity as observed by A?

0.99 c0.94 c0.9 c0

14. An object of length 1 m is moving at speed 0.5c. To an observer at rest relative to the object, the length of the object seems to be ___________

0.5 m1 m0.14 m0.86 m

15. From the graph, what should be the velocity as observed from frame S?

0.6 c0.9 c0.8 c0.7 c

16. Calculate the de-Broglie wavelength of an electron which has been accelerated from rest on application of potential of 400volts.

0.2514 Å0.5125 Å0.6135 Å0.1653 Å

17. The lowest possible mass of a particle is its _____________

Gravitational massInertial massRest massRelativistic mass

18. A man, who weighs 60 kg on earth, weighs 61 kg on a rocket, as measured by an observer on earth. What is the speed of the rocket?

5.5 X 107 m/s2.5 X 108 m/s2.5 X 107 m/s5.5 X 108 m/s

19. Which of the following is associated with an electron microscope?

Magnetic wavesMatter wavesElectrical wavesElectromagnetic waves

20. Which of the following is called as non-mechanical waves?

Matter wavesElectrical wavesMagnetic wavesElectromagnetic waves

21. The energy distribution is not uniform for any given temperature in a perfect black body.

TrueMaybeFalseDon't know

22. In Lorentzian relativity, if two events are simultaneous for one observer, they will be simultaneous for all other observers as well.

TrueMaybeFalseDon't know

23. In the case v << c, Lorentz transformation is the same as ____________

Galilean transformationEinstein’s transformationMaxwell’s transformationPlanck’s transformation

24. If the direction of velocity is changed by 180o simultaneously, the mass would _____________

Not ChangeChange simultaneouslyDecreaseIncrease

25. The speed of light is a limiting velocity, unattainable by a material body.

MaybeTrueFalseDon't know