Practice Test GeeksOAT - Optometry Admission Test Practice Test
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Physics Principles Flashcards

7 cards from real OAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Physics Principles flashcards as text

  1. A 500 kg elevator accelerates upward at 2 m/s². What is the tension in the supporting cable? (g = 10 m/s²)

    Answer: 6000 N

    T − mg = ma → T = m(g + a) = 500(10 + 2) = 6000 N.

  2. Which law states that the total electric flux through a closed surface equals the enclosed charge divided by the permittivity of free space?

    Answer: Gauss's Law

    Gauss's Law relates total electric flux through a closed (Gaussian) surface to the enclosed charge: Φ = Q_enc/ε₀.

  3. A convex lens has a focal length of 20 cm. An object is placed 30 cm from the lens. Where is the image formed?

    Answer: 60 cm on the opposite side

    1/v − 1/u = 1/f → 1/v = 1/20 + 1/30 = 5/60 → v = 60 cm on the opposite side (real image).

  4. Which property of sound determines its perceived loudness?

    Answer: Amplitude

    Loudness is determined by amplitude (or intensity); greater amplitude causes greater pressure variation and louder sound.

  5. A battery of EMF 12 V and internal resistance 1 Ω is connected to a 5 Ω external resistor. What is the terminal voltage?

    Answer: 10 V

    Current I = 12/(1+5) = 2 A; terminal voltage = EMF − Ir = 12 − 2(1) = 10 V.

  6. An object with mass 3 kg moving at 4 m/s collides and sticks to a stationary 1 kg object. What is the velocity after collision?

    Answer: 3 m/s

    Conservation of momentum: (3)(4) = (3+1)v → v = 12/4 = 3 m/s.

  7. Which of the following describes the Doppler effect for light when a source moves away from an observer?

    Answer: Redshift — observed frequency decreases

    When a light source recedes, the wavelength stretches (redshift) and the observed frequency decreases.