Quantum Field Theory in Curved Spacetime MCQs with Answers

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Quantum Field Theory in Curved Spacetime Online Quiz

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• Test Name: Quantum Field Theory in Curved Spacetime MCQ Quiz Practice
• Type: Quiz Test
• Total Questions: 40
• Total Marks: 40
• Time: 40 minutes

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Quantum Field Theory in Curved Spacetime

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1 / 40

What is the role of the stress-energy tensor in QFT in curved spacetime?

Describes the distribution of matter and energy

Measures temperature distribution

Quantizes the gravitational field

2 / 40

What is the relationship between entropy and the event horizon of a black hole?

Entropy is independent of the horizon

Entropy is inversely proportional

Entropy is proportional to the horizon area

3 / 40

What is the role of the metric tensor in curved spacetime?

Describes the geometric properties of spacetime

Measures the energy of particles

Quantizes the electromagnetic field

4 / 40

What is the significance of the Rindler coordinates?

Describe rotating frames

Describe spherical coordinates

Describe a uniformly accelerated frame

5 / 40

What is the Casimir effect?

Magnetic field interaction

Particle-antiparticle annihilation

Force between uncharged, conducting plates due to quantum vacuum

6 / 40

What is the effect of spacetime curvature on quantum field modes?

Alters the frequency and amplitude of modes

Has no effect on the modes

Only affects high-energy modes

7 / 40

Who derived the theory of black hole radiation?

Roger Penrose

Stephen Hawking

Jacob Bekenstein

8 / 40

What concept explains the thermal nature of black hole radiation?

Hawking temperature

Entropy

Planck's constant

9 / 40

What does the term "vacuum polarization" mean?

Complete vacuum state

Zero point energy

Modification of the vacuum by virtual particles

10 / 40

What is the nature of quantum fluctuations in curved spacetime?

Large, predictable changes

Small, random changes in quantum fields

Constant, non-random changes

11 / 40

Which theorem is crucial for understanding QFT in curved spacetime?

Noether's theorem

Bell's theorem

Carnot's theorem

12 / 40

What does QFT in curved spacetime primarily study?

Quantum fields in flat spacetime

Classical fields in curved spacetime

Quantum fields in a non-flat background

13 / 40

What is a primary tool for studying QFT in curved spacetime?

Newtonian mechanics

Path integral formulation

Classical wave equations

14 / 40

What is a key concept in semiclassical gravity?

Fully quantizing gravity

Treating gravity classically and matter quantum mechanically

Disregarding quantum effects in gravity

15 / 40

What is the primary effect studied in Hawking radiation?

Quantum teleportation

Cosmic microwave background radiation

Black hole evaporation

16 / 40

What is the significance of the Bogoliubov transformation in QFT in curved spacetime?

Describes wavefunction collapse

Measures particle spin

Relates different vacuum states

17 / 40

What is the name of the radiation predicted to be emitted by black holes?

Cherenkov radiation

Bremsstrahlung

Hawking radiation

18 / 40

Which field equation is solved in a curved spacetime background in QFT?

Einstein field equations

Newton's laws

Maxwell's equations

19 / 40

How is the effective action used in QFT in curved spacetime?

Measures particle energy

Encodes all quantum effects in a classical background

Describes wavefunctions

20 / 40

What is meant by "backreaction" in semiclassical gravity?

Ignoring quantum field effects

Only considering classical fields

Effect of quantum fields on the spacetime geometry

21 / 40

What is the Bunch-Davies vacuum?

A high-energy particle state

A particular vacuum state in de Sitter space

A vacuum state in Minkowski space

22 / 40

What is the Unruh effect?

Entanglement of distant particles

Particle creation near event horizons

Perception of a thermal bath by an accelerated observer

23 / 40

What is the Euclidean path integral approach?

A method to compute quantum amplitudes in imaginary time

A method for classical mechanics

A computational tool in thermodynamics

24 / 40

What is the role of an observer's acceleration in the Unruh effect?

Increases particle velocity

Creates a perception of a thermal bath

Decreases particle mass

25 / 40

What is the significance of the horizon temperature in black hole physics?

Describes classical orbits

Determines the radiation spectrum

Measures gravitational waves

26 / 40

What does the term "renormalization" refer to in QFT?

Ignoring certain quantum effects

Calculating exact solutions

Removing infinities from calculations

27 / 40

What does the term "vacuum state" refer to in QFT?

A state with no particles

The lowest energy state

A state with maximal particles

28 / 40

What is the significance of a conformal field theory in curved spacetime?

Describes non-relativistic systems

Measures classical trajectories

Invariance under angle-preserving transformations

29 / 40

What is the primary consequence of the equivalence principle in QFT in curved spacetime?

Constant speed of light

Local physics is the same in all free-fall frames

Gravitational force quantization

30 / 40

What equation is modified for use in curved spacetime?

Pauli equation

Schrödinger equation

Klein-Gordon equation

31 / 40

Which concept connects quantum mechanics and general relativity in curved spacetime?

String theory

Classical mechanics

Quantum gravity

32 / 40

What is the impact of a strong gravitational field on quantum fields?

Has no impact

Causes particle annihilation

Causes particle creation

33 / 40

How does the cosmological constant affect quantum fields in curved spacetime?

Has no effect on quantum fields

Only affects classical fields

Alters the dynamics of quantum fields

34 / 40

How does the AdS/CFT correspondence relate to QFT in curved spacetime?

Measures classical field dynamics

Provides a duality between a gravity theory in AdS space and a CFT

Describes quantum tunneling

35 / 40

In what context does the term "spontaneous symmetry breaking" appear in QFT?

When a symmetric state leads to asymmetric outcomes

When symmetry is always preserved

When particles remain symmetric

36 / 40

What is the significance of the Hartle-Hawking state?

A proposed ground state for the universe

A state of maximal entropy

A classical solution to Einstein's equations

37 / 40

What does the term "event horizon" mean?

Boundary beyond which nothing can escape

Surface of a neutron star

Region of intense magnetic fields

38 / 40

What does the term "geodesic" refer to?

A straight line in flat spacetime

A path of a charged particle in a magnetic field

The shortest path between two points in curved spacetime

39 / 40

Which theoretical physicist is well-known for contributions to QFT in curved spacetime?

Albert Einstein

Stephen Hawking

Richard Feynman

40 / 40

What phenomenon is associated with particle creation in an expanding universe?

Cosmological particle production

Black hole evaporation

Quantum tunneling

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