Relativistic Mechanics MCQs with Answers

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Relativistic Mechanics Online Quiz

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• Test Name: Relativistic Mechanics MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Relativistic Mechanics

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1 / 40

What is the concept that time can slow down for an object in motion relative to a stationary observer?

Length contraction

Mass increase

Time dilation

2 / 40

What is the significance of the constant speed of light in special relativity?

It only applies in a vacuum

It varies with the observer's speed

It is the same for all observers regardless of their motion

3 / 40

What is the impact of relativistic speeds on space?

Space remains unchanged

Space expands in the direction of motion

Space contracts in the direction of motion

4 / 40

What is the consequence of traveling close to the speed of light on aging?

Aging speeds up

Aging remains the same

Aging slows down

5 / 40

What are the Lorentz transformations?

Equations for wave functions

Equations describing gravitational fields

Equations that relate space and time coordinates between two inertial frames

6 / 40

What is the relativistic momentum of an object?

p = γmv

p = m/a

p = mv

7 / 40

What does the theory of special relativity primarily deal with?

High velocities close to the speed of light

Low velocities

Quantum mechanics

8 / 40

What phenomenon results from the relativistic increase in mass with velocity?

Mass-energy equivalence

Time dilation

Length contraction

9 / 40

Who proposed the theory of special relativity?

Albert Einstein

Niels Bohr

Isaac Newton

10 / 40

What happens to the mass of an object as it approaches the speed of light?

It remains constant

It increases

It decreases

11 / 40

What is an inertial frame of reference?

A frame of reference with gravitational forces

A frame of reference that is accelerating

A frame of reference that is not accelerating

12 / 40

What is the twin paradox?

A hypothesis about star formation

A thought experiment where one twin ages slower than the other due to high-speed travel

A theory about identical particles

13 / 40

What is the principle of relativity?

The speed of light is infinite

Gravity affects only large masses

The laws of physics are the same in all inertial frames of reference

14 / 40

What is the relationship between energy and momentum for a photon?

E = pc

E = hν

E = mc^2

15 / 40

What is the twin paradox intended to illustrate?

Length contraction

Mass increase

Time dilation

16 / 40

What is the spacetime interval?

The time taken for light to travel between two points

The distance between two stars

A measure of the separation between two events in spacetime

17 / 40

What is length contraction?

Objects moving at high speeds become heavier

Objects moving at high speeds appear shorter in the direction of motion

Objects moving at high speeds appear longer

18 / 40

What does special relativity say about simultaneity?

Events that are simultaneous in one frame may not be simultaneous in another

Simultaneity is absolute

All observers agree on simultaneity

19 / 40

What is the speed of light in a vacuum?

Approximately 299,792 km/s

Approximately 500,000 km/s

Approximately 150,000 km/s

20 / 40

What is the relativistic effect on the kinetic energy of a moving object?

It remains constant

It decreases

It increases more rapidly than at low speeds

21 / 40

What is the effect of gravity on light as predicted by general relativity?

Light is absorbed by gravity

Light speeds up in the presence of gravity

Light bends in the presence of gravity

22 / 40

What happens to the observed frequency of light when an object moves towards the observer at high speed?

The frequency remains the same

The frequency decreases (redshift)

The frequency increases (blueshift)

23 / 40

What is rest mass?

The mass of an object when it is not moving

The mass of an object in motion

The mass of an object under gravitational force

24 / 40

What is the concept that the laws of physics are the same in all inertial frames?

Principle of uncertainty

Principle of relativity

Principle of equivalence

25 / 40

What is the relativistic Doppler effect?

The change in frequency of light or sound due to the relative motion of source and observer

The bending of light by gravity

The redshift of distant galaxies

26 / 40

What does the variable γ (gamma) represent in relativistic equations?

The gravitational constant

The Lorentz factor

The Planck constant

27 / 40

What is the relativistic effect on objects moving at speeds close to the speed of light?

Length contraction and time dilation

Increase in temperature

Increase in gravitational force

28 / 40

What happens to clocks moving at relativistic speeds compared to those at rest?

They stop

They run slower

They run faster

29 / 40

What is relativistic aberration?

The shift in the frequency of light due to motion

The bending of light by gravity

The apparent change in the direction of light due to relative motion

30 / 40

What is the energy-momentum relation in special relativity?

p = mv

E^2 = (pc)^2 + (mc^2)^2

E = mc^2

31 / 40

What is the proper length?

The length of an object in a gravitational field

The length of an object measured in its rest frame

The length of an object measured in motion

32 / 40

What is the significance of Minkowski spacetime?

It is the model of space in Newtonian physics

It is the measure of time in classical mechanics

It is the mathematical model combining space and time into a four-dimensional continuum

33 / 40

What is the term for the maximum speed limit in the universe according to special relativity?

The speed of sound

The speed of light

The escape velocity

34 / 40

What is the difference between general relativity and special relativity?

General relativity deals with high speeds, special relativity does not

General relativity includes gravity, special relativity does not

Special relativity includes gravity, general relativity does not

35 / 40

What is the famous equation derived from special relativity?

F = ma

E = hν

E = mc^2

36 / 40

What does it mean when an object's velocity approaches the speed of light?

Its mass approaches zero

Its mass remains constant

Its mass approaches infinity

37 / 40

What is proper time?

The time measured by a stationary observer

The time interval measured by a clock moving with the observer

The time interval between two distant stars

38 / 40

What is relativistic velocity addition?

The increase in velocity due to gravity

The formula for adding velocities in a relativistic context

The decrease in velocity due to friction

39 / 40

What is the meaning of "light cone" in relativity?

A device used to measure the speed of light

The path of a star's light in space

The surface that represents the possible directions light can travel through spacetime

40 / 40

What is relativistic mass?

The increase in mass of an object as it approaches the speed of light

The mass lost in a nuclear reaction

The mass of an object at rest

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