GRE Physics Practice Test 1

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Online GRE Physics Practice Test 1 for different Competitive Exams, Entrance Tests & Job Interviews. Test yourself. Take various online tests and find out how well you score before appearing in your upcoming interviews and written tests.

Instructions

Welcome to our FREE online test. Beware of anyone asking for money to take this test.

Total questions: 20

Time limit: 30 minutes

Each question is worth 1 point, and there are no penalties for wrong answers.

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Time remaining: 30:00
1. A particle moves in a circular path with a constant speed. Which of the following statements is true about its acceleration?
  1. The acceleration is zero because the speed is constant.
  2. The acceleration is directed toward the center of the circle.
  3. The acceleration is tangential to the path.
  4. The acceleration is inversely proportional to the radius.
2. A 2 kg block slides down a frictionless inclined plane at 30 degrees to the horizontal. What is its acceleration along the plane? (g = 9.8 m/s²)
  1. 9.8 m/s²
  2. 4.9 m/s²
  3. 8.5 m/s²
  4. 2.45 m/s²
3. Match the following quantum numbers with their correct descriptions:
  1. n – Spin of the electron
  2. l – Orbital angular momentum
  3. m_l – Principal energy level
  4. s – Magnetic quantum number
4. A scientist observes that light passing through a double-slit produces an interference pattern. If the slit separation is halved, what happens to the fringe spacing?
  1. It remains unchanged.
  2. It decreases by a factor of √2.
  3. It doubles.
  4. It becomes four times larger.
5. Arrange the following electromagnetic waves in increasing order of wavelength: (1) X-rays (2) Radio waves (3) Visible light (4) Gamma rays
  1. 4, 1, 3, 2
  2. 4, 1, 3, 2
  3. 2, 3, 1, 4
  4. 1, 4, 2, 3
6. The work function of a metal is 2.3 eV. What is the minimum frequency of light required to eject electrons from its surface? (h = 4.14 × 10⁻¹⁵ eV·s)
  1. 3.6 × 10¹⁴ Hz
  2. 1.8 × 10¹⁵ Hz
  3. 5.56 × 10¹⁴ Hz
  4. 6.7 × 10¹³ Hz
7. A parallel-plate capacitor has a capacitance of 10 µF. If the distance between the plates is doubled while keeping the charge constant, what is the new capacitance?
  1. 20 µF
  2. 5 µF
  3. 10 µF
  4. 40 µF
8. A 500-word passage describes a thermodynamic cycle involving isothermal and adiabatic processes. Which of the following is true for an ideal gas in an isothermal expansion?
  1. The internal energy increases.
  2. No work is done by the gas.
  3. The temperature remains constant.
  4. Heat is lost by the system.
9. Assertion: In a uniform magnetic field, a charged particle moves in a helical path if it has a velocity component perpendicular to the field. Reason: The parallel component of velocity remains unchanged, while the perpendicular component causes circular motion.
  1. Both assertion and reason are false.
  2. The assertion is true, but the reason is false.
  3. Both assertion and reason are true, and the reason explains the assertion.
  4. The assertion is false, but the reason is true.
10. The half-life of a radioactive element is 8 days. What fraction of the original sample remains after 24 days?
  1. 1/16
  2. 1/8
  3. 1/8
  4. 1/2
11. A standing wave is formed on a string fixed at both ends. If the length of the string is L, what is the wavelength of the third harmonic?
  1. L
  2. 2L/3
  3. 2L/3
  4. L/2
12. In a Young’s double-slit experiment, the intensity of light at a point where the path difference is λ/4 is I. What is the maximum possible intensity?
  1. I
  2. 2I
  3. 4I
  4. I/2
13. A hydrogen atom transitions from the n=3 to n=1 state. Which of the following describes the emitted photon?
  1. It has a longer wavelength than a n=2 to n=1 transition.
  2. Its energy is less than that of a n=4 to n=2 transition.
  3. Its energy equals the difference between the n=3 and n=1 levels.
  4. It is in the microwave region of the spectrum.
14. A cylindrical conductor of radius R carries a current I uniformly distributed across its cross-section. What is the magnetic field at a distance r < R from the center?
  1. Zero
  2. Proportional to 1/r
  3. Proportional to r²
  4. Proportional to r
15. A thermodynamic system undergoes a cyclic process. Which of the following must be zero for the entire cycle?
  1. Work done
  2. Heat transfer
  3. Entropy change
  4. Change in internal energy
16. A particle of mass m is in a one-dimensional infinite potential well of width L. If the energy of the ground state is E, what is the energy of the first excited state?
  1. E
  2. 2E
  3. 4E
  4. 8E
17. A beam of unpolarized light passes through two polarizers. The first polarizer is oriented at 30° to the vertical, and the second at 60° to the vertical. What fraction of the initial intensity is transmitted?
  1. 1/8
  2. 3/8
  3. 1/4
  4. 1/2
18. A satellite orbits Earth in a circular path. If the radius of the orbit is doubled, what happens to its orbital speed?
  1. Increases by a factor of 2
  2. Remains unchanged
  3. Decreases by a factor of √2
  4. Decreases by a factor of 2
19. In a nuclear reaction, the mass defect is 0.02 atomic mass units. What is the energy released? (1 amu = 931 MeV)
  1. 0.02 MeV
  2. 9.31 MeV
  3. 18.62 MeV
  4. 465.5 MeV
20. A 100-word passage describes a gas expanding adiabatically. Which statement is true?
  1. The temperature increases.
  2. Heat is added to the system.
  3. The pressure remains constant.
  4. The internal energy decreases.

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