PHYS 165 Module 6 | Physics Exam Q&A | Portage
Learning
These are 100 original multiple-choice practice questions for PHYS 165 Module 6.
Since exact module content varies by institution, this set assumes Module 6 serves as a
capstone module covering special relativity, quantum physics, atomic physics,
nuclear physics, particle physics, cosmology, and a comprehensive review of
physics concepts. They are not official examination questions and are not copied from
any textbook, test bank, or copyrighted source.
Question 1:
Which postulate is part of Einstein’s special theory of relativity?
A. The speed of light in a vacuum is constant for all inertial observers.
B. Mass is always conserved in nuclear reactions.
C. Time is absolute for all observers.
D. Space and time are independent.
Correct answer: A
Rationale:
Special relativity assumes the speed of light in a vacuum is the same for all inertial
observers.
Question 2:
The second postulate of special relativity states that:
A. The laws of physics are the same in all inertial reference frames.
B. Only mechanical laws are relative.
C. The speed of light depends on the observer.
D. Absolute motion can be detected.
Correct answer: A
Rationale:
The laws of physics are invariant in all inertial frames.
Question 3:
The time dilation formula is:
,A. Δt = γΔt₀
B. Δt = Δt₀/γ
C. Δt = γ/Δt₀
D. Δt = Δt₀ + γ
Correct answer: A
Rationale:
Δt = γΔt₀, where γ = 1/√(1 − v²/c²).
Question 4:
Proper time is the time interval measured:
A. In the rest frame of the event
B. By the fastest-moving observer
C. In any frame
D. Only in a gravitational field
Correct answer: A
Rationale:
Proper time is measured by an observer at rest relative to the event.
Question 5:
Length contraction is given by:
A. L = L₀/γ
B. L = γL₀
C. L = L₀γ²
D. L = L₀ + γ
Correct answer: A
Rationale:
L = L₀/γ; objects are shortened along the direction of motion.
Question 6:
Proper length is the length measured:
A. In the rest frame of the object
B. By the fastest observer
C. In any frame
D. Only at high temperature
,Correct answer: A
Rationale:
Proper length is measured in the object’s rest frame.
Question 7:
Relativistic momentum is:
A. p = γmv
B. p = mv
C. p = γm/v
D. p = m/γv
Correct answer: A
Rationale:
p = γmv, which approaches mv at low speeds.
Question 8:
The rest energy of a particle is:
A. E₀ = mc²
B. E₀ = ½mv²
C. E₀ = mgh
D. E₀ = hf
Correct answer: A
Rationale:
Rest energy is E₀ = mc².
Question 9:
The total relativistic energy is:
A. E = γmc²
B. E = mc²
C. E = ½mv²
D. E = mgh
Correct answer: A
Rationale:
Total energy E = γmc².
, Question 10:
Relativistic kinetic energy is:
A. K = (γ − 1)mc²
B. K = ½mv²
C. K = γmc²
D. K = mc²
Correct answer: A
Rationale:
K = (γ − 1)mc², reducing to ½mv² at low speeds.
Question 11:
As an object’s speed approaches c, its relativistic momentum:
A. Approaches infinity
B. Approaches zero
C. Stays constant
D. Becomes negative
Correct answer: A
Rationale:
γ increases without bound as v → c, so momentum approaches infinity.
Question 12:
Relativistic addition of velocities ensures that:
A. No speed exceeds c
B. Speeds can exceed c
C. Velocities simply add
D. Light slows down
Correct answer: A
Rationale:
The relativistic velocity addition formula never yields a speed greater than c.
Question 13:
GPS satellites must correct for:
Learning
These are 100 original multiple-choice practice questions for PHYS 165 Module 6.
Since exact module content varies by institution, this set assumes Module 6 serves as a
capstone module covering special relativity, quantum physics, atomic physics,
nuclear physics, particle physics, cosmology, and a comprehensive review of
physics concepts. They are not official examination questions and are not copied from
any textbook, test bank, or copyrighted source.
Question 1:
Which postulate is part of Einstein’s special theory of relativity?
A. The speed of light in a vacuum is constant for all inertial observers.
B. Mass is always conserved in nuclear reactions.
C. Time is absolute for all observers.
D. Space and time are independent.
Correct answer: A
Rationale:
Special relativity assumes the speed of light in a vacuum is the same for all inertial
observers.
Question 2:
The second postulate of special relativity states that:
A. The laws of physics are the same in all inertial reference frames.
B. Only mechanical laws are relative.
C. The speed of light depends on the observer.
D. Absolute motion can be detected.
Correct answer: A
Rationale:
The laws of physics are invariant in all inertial frames.
Question 3:
The time dilation formula is:
,A. Δt = γΔt₀
B. Δt = Δt₀/γ
C. Δt = γ/Δt₀
D. Δt = Δt₀ + γ
Correct answer: A
Rationale:
Δt = γΔt₀, where γ = 1/√(1 − v²/c²).
Question 4:
Proper time is the time interval measured:
A. In the rest frame of the event
B. By the fastest-moving observer
C. In any frame
D. Only in a gravitational field
Correct answer: A
Rationale:
Proper time is measured by an observer at rest relative to the event.
Question 5:
Length contraction is given by:
A. L = L₀/γ
B. L = γL₀
C. L = L₀γ²
D. L = L₀ + γ
Correct answer: A
Rationale:
L = L₀/γ; objects are shortened along the direction of motion.
Question 6:
Proper length is the length measured:
A. In the rest frame of the object
B. By the fastest observer
C. In any frame
D. Only at high temperature
,Correct answer: A
Rationale:
Proper length is measured in the object’s rest frame.
Question 7:
Relativistic momentum is:
A. p = γmv
B. p = mv
C. p = γm/v
D. p = m/γv
Correct answer: A
Rationale:
p = γmv, which approaches mv at low speeds.
Question 8:
The rest energy of a particle is:
A. E₀ = mc²
B. E₀ = ½mv²
C. E₀ = mgh
D. E₀ = hf
Correct answer: A
Rationale:
Rest energy is E₀ = mc².
Question 9:
The total relativistic energy is:
A. E = γmc²
B. E = mc²
C. E = ½mv²
D. E = mgh
Correct answer: A
Rationale:
Total energy E = γmc².
, Question 10:
Relativistic kinetic energy is:
A. K = (γ − 1)mc²
B. K = ½mv²
C. K = γmc²
D. K = mc²
Correct answer: A
Rationale:
K = (γ − 1)mc², reducing to ½mv² at low speeds.
Question 11:
As an object’s speed approaches c, its relativistic momentum:
A. Approaches infinity
B. Approaches zero
C. Stays constant
D. Becomes negative
Correct answer: A
Rationale:
γ increases without bound as v → c, so momentum approaches infinity.
Question 12:
Relativistic addition of velocities ensures that:
A. No speed exceeds c
B. Speeds can exceed c
C. Velocities simply add
D. Light slows down
Correct answer: A
Rationale:
The relativistic velocity addition formula never yields a speed greater than c.
Question 13:
GPS satellites must correct for:
