GRE PHYSICS SUBJECT TEST QUESTION
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. A particle moves in one dimension with position 𝑥(𝑡) = 𝐴𝑡 3 + 𝐵𝑡. The
acceleration is
A. 6𝐴𝑡 + 𝐵
B. 3𝐴𝑡 2
C. 6𝐴𝑡
D. 𝐴𝑡 2
Answer: C
Rationale: Acceleration is the second derivative of position: 𝑣 = 3𝐴𝑡 2 + 𝐵, 𝑎 =
6𝐴𝑡.
2. Which force is conservative?
A. Friction
B. Air drag
C. Gravitational force
D. Viscous damping
Answer: C
Rationale: Gravitational force has a well-defined potential energy.
3. The work done by centripetal force in uniform circular motion is
A. Maximum
, B. Nonzero
C. Infinite
D. Zero
Answer: D
Rationale: Force is perpendicular to velocity, so no work is done.
4. The moment of inertia of a thin ring about its center is
1
A. 𝑀𝑅2
2
B. 𝑀𝑅2
2
C. 𝑀𝑅2
3
5
D. 𝑀𝑅2
2
Answer: B
Rationale: All mass is at distance R from the axis.
5. In simple harmonic motion, maximum speed occurs at
A. Maximum displacement
B. Equilibrium position
C. Turning points
D. Any position
Answer: B
Rationale: Potential energy is minimum and kinetic energy maximum at
equilibrium.
6. The quality factor Q of an oscillator measures
A. Frequency
B. Energy stored
C. Damping
D. Amplitude
, Answer: C
Rationale: Q relates stored energy to energy lost per cycle.
7. The electric field inside a conductor in electrostatic equilibrium is
A. Maximum
B. Non-uniform
C. Finite
D. Zero
Answer: D
Rationale: Charges rearrange to cancel internal electric fields.
8. Gauss’s law relates electric flux to
A. Electric field
B. Surface area
C. Potential
D. Enclosed charge
Answer: D
Rationale: Total flux is proportional to enclosed charge.
9. The SI unit of magnetic flux is
A. Tesla
B. Weber
C. Weber
D. Henry
Answer: C
Rationale: Magnetic flux is measured in webers (Wb).
AND CORRECT ANSWERS (VERIFIED
ANSWERS) PLUS RATIONALES 2026 Q&A
INSTANT DOWNLOAD PDF
1. A particle moves in one dimension with position 𝑥(𝑡) = 𝐴𝑡 3 + 𝐵𝑡. The
acceleration is
A. 6𝐴𝑡 + 𝐵
B. 3𝐴𝑡 2
C. 6𝐴𝑡
D. 𝐴𝑡 2
Answer: C
Rationale: Acceleration is the second derivative of position: 𝑣 = 3𝐴𝑡 2 + 𝐵, 𝑎 =
6𝐴𝑡.
2. Which force is conservative?
A. Friction
B. Air drag
C. Gravitational force
D. Viscous damping
Answer: C
Rationale: Gravitational force has a well-defined potential energy.
3. The work done by centripetal force in uniform circular motion is
A. Maximum
, B. Nonzero
C. Infinite
D. Zero
Answer: D
Rationale: Force is perpendicular to velocity, so no work is done.
4. The moment of inertia of a thin ring about its center is
1
A. 𝑀𝑅2
2
B. 𝑀𝑅2
2
C. 𝑀𝑅2
3
5
D. 𝑀𝑅2
2
Answer: B
Rationale: All mass is at distance R from the axis.
5. In simple harmonic motion, maximum speed occurs at
A. Maximum displacement
B. Equilibrium position
C. Turning points
D. Any position
Answer: B
Rationale: Potential energy is minimum and kinetic energy maximum at
equilibrium.
6. The quality factor Q of an oscillator measures
A. Frequency
B. Energy stored
C. Damping
D. Amplitude
, Answer: C
Rationale: Q relates stored energy to energy lost per cycle.
7. The electric field inside a conductor in electrostatic equilibrium is
A. Maximum
B. Non-uniform
C. Finite
D. Zero
Answer: D
Rationale: Charges rearrange to cancel internal electric fields.
8. Gauss’s law relates electric flux to
A. Electric field
B. Surface area
C. Potential
D. Enclosed charge
Answer: D
Rationale: Total flux is proportional to enclosed charge.
9. The SI unit of magnetic flux is
A. Tesla
B. Weber
C. Weber
D. Henry
Answer: C
Rationale: Magnetic flux is measured in webers (Wb).
