OAT Physics Principles 2

Question 1

A projectile is launched horizontally from a cliff 80 m high with an initial speed of 20 m/s. How far from the base of the cliff does it land? (g = 10 m/s²)

Accepted Answer

80 m

Answer

Time to fall: t = √(2h/g) = √16 = 4 s; horizontal range = 20 × 4 = 80 m.

Question 2

Which of the following best describes the work done by a centripetal force on an object moving in a circular path?

Accepted Answer

Zero, because force is perpendicular to velocity

Answer

Centripetal force always points toward the center, perpendicular to the velocity, so it does no work on the object.

Question 3

An ideal gas undergoes an isothermal expansion. Which statement is correct?

Accepted Answer

The gas does positive work and absorbs heat from surroundings

Answer

In an isothermal process, internal energy is constant, so by the first law, heat absorbed equals work done by the gas.

Question 4

Two parallel plates separated by 0.01 m create a uniform electric field. If a proton (charge 1.6 × 10⁻¹⁹ C) accelerates through a potential difference of 100 V, what is its gain in kinetic energy?

Accepted Answer

1.6 × 10⁻¹⁷ J

Answer

ΔKE = qΔV = (1.6 × 10⁻¹⁹ C)(100 V) = 1.6 × 10⁻¹⁷ J.

Question 5

Light travels from glass (n = 1.5) into air (n = 1.0). What is the critical angle for total internal reflection?

Accepted Answer

41.8°

Answer

sin θ_c = n₂/n₁ = 1.0/1.5 = 0.667, so θ_c = sin⁻¹(0.667) ≈ 41.8°.

OAT - Optometry Admission Test Practice Test

OAT - Optometry Admission Test Practice Test

OAT Physics Principles 2