OAT Physics Practice Test 2023 Questions and Answers

A man walks three blocks (30 m) east and then another five blocks (50 m) north to the drug store (point A)

What distance did he walk?

A submarine sends out a sonar signal (sound wave) in a direction directly downward. It takes 2.3 s for the sound wave to travel from the submarine to the ocean bottom and back to the submarine. How high up from the ocean floor is the submarine? (The speed of sound in water is 1,490 m/s.)

A 1,000 kg rocket ship, traveling at 100 m/s, is acted on by an average force of 20 kN applied in the direction of its motion for 8 s. What is the change in velocity of the rocket?

An object is moving uniformly in a circle whose diameter is 200 m. If the centripetal acceleration of the object is 4 m/s 2 , what is the time for one revolution of the circle?

A tractor pulls a log that has a mass of 500 kg along the ground for 100 m. The rope (between the tractor and the log) makes an angle of 30° with the ground, and is acted on by a tensile force of 5,000 N.
How much work does the tractor do?

A 2,000 kg experimental car can accelerate from zero to 30 m/s in 6.3 s. What is the average power of the engine needed to achieve this acceleration?

A 2,000 kg rollercoaster car is brought to the top of a 150 m long section of track that is inclined at 30° with the horizontal. The speed of the car is 3 m/s at the top.

In the absence of friction, what is the change in kinetic energy when going from the top to the bottom of the track?

Two billiard balls, one moving at 0.5 m/s and the other at rest, undergo a perfectly elastic collision.
If the masses of the billiard balls are equal and the speed of the stationary one after the collision is 0.5 m/s, then what is the speed of the other ball after the collision?

If, in a reversible process, 6.66 × 10⁴ J of heat is used to change a 200 g block of ice to water at a temperature of 273 K, what is the change in the entropy of the system?

A 20 m steel rod at 10°C is dangling from the edge of a building and is just 2.5 cm from the ground. If the rod is now heated to 90°C, what is its increase in length?

Thermal equilibrium exists when

A hydraulic press has two pistons. One piston of radius 5 cm pushes down on an enclosed fluid and has a 45 kg weight resting on it. The other, larger piston has a radius of 20 cm. What force is needed on the larger piston to keep the press in equilibrium?

A wooden block floats in the ocean with half its volume submerged. Find the density of the wood Pb if the density of seawater is 1,024 kg/m³

An anchor made of iron weighs 833 N on the deck of a ship. If the anchor is now suspended in seawater by a massless chain, what is the tension in the chain? The density of iron is 7,800 kg/m³ , and the density of seawater is 1,024 kg/m³ .

Water flows from a pipe of diameter 0.15 m into one of diameter 0.20 m. If the speed in the 0.15 m pipe is 4.88 m/s, what is the speed in the 0.20 m pipe?

A positive charge of +1 × 10⁻⁵ C is located one meter away from another positive charge of +2 × 10⁻⁵ C. At what point along the line between the two charges is the electric field equal to zero?

A metal sphere, R, has a charge of − q coulombs. An identical metal sphere, S, has a charge of +2 q coulombs. The magnitude of the electrical force on S due to R is F newtons

The magnitude of the electric force on R due to S is

A metal sphere, R, has a charge of − q coulombs. An identical metal sphere, S, has a charge of +2 q coulombs. The magnitude of the electrical force on S due to R is F newtons

If an electron were placed midway between R and S, the resultant electric force on the electron would be

A positive charge of + Q is fixed at point R a distance d away from another positive charge of +2 Q fixed at point S. Point A is located midway between the charges, and point B is a distance d/2 from the +2 Q charge

In which direction will a positive charge move if placed at point A?

Given an electric dipole, the electric potential is zero

The voltage across the terminals of an isolated 3 μF capacitor is 4 V. If a piece of ceramic having dielectric constant k = 2 is placed between the plates, find: the new charge on the capacitor.

A charge of 2 μC flows from the positive terminal of a 6 V battery, through a 100 Ω resistor, and back through the battery to the positive terminal. What is the total voltage drop experienced by the charge?

If the resistance of two conductors of equal cross- sectional area and equal lengths are compared, it is found that they are in the ratio 1:2. The resistivities of the materials from which they are constructed must therefore be in what ratio?

A transformer is a device that takes an input voltage and produces an output voltage that can be either larger or smaller than the input voltage depending on the transformer design. Although the voltage is changed by the transformer, energy is not, so the input power equals the output power. A particular transformer produces an output voltage that is 300% of the input voltage. What is the ratio of the output current to the input current?

The energy stored in a fully charged capacitor is given by E = (1/2) CV2 . In a typical cardiac defibrillator, a capacitor charged to 7,500 V has a stored energy of 400 W・s. If the charge Q and voltage V on a capacitor are related by Q = CV, what is the charge on the capacitor in the cardiac defibrillator?

A 10.0 Ω resistor carries a current that varies as a function of time as shown below. What energy has been dissipated by the resistor after 5 s?

A traveling sinusoidal wave is described by y = (0.006) sin(67.7 x − 1.71 t). Assume units of meters and seconds. Find the: amplitude.

A certain sound level is increased by 20 dB. By how much does its intensity increase?

An object is placed at the center of curvature of a concave mirror. The image it creates must be

When monochromatic light is refracted as it passes from air to glass, which of the following does not remain the same? (Assume that the wave is fully transmitted.)

Which phenomenon would cause monochromatic light entering the prism along path AB to leave along path CD?

What is the difference in ionization energy for a hydrogen atom with its electron in the ground state and a hydrogen atom with its electron in the n = 4 state?

When a hydrogen atom electron falls to the ground state from the n = 2 state, 10.2 eV of energy is emitted. What is the wavelength of this radiation? (Use 1 eV = 1.60 × 10⁻¹⁹ J, h = 6.63 × 10−34 J・s)

The masses of four different objects taken with different scales were 23.04 g, 7.12 g, 0.0088 g and 5.423 g. What is the total mass of all four objects to the proper number of significant digits?

Consider the following statements about Newton’s law:

I. A newton is a fundamental unit.
II. Mass and acceleration are inversely related when the force is constant.
III. Newton’s first law can be derived from Newton’s second law.
IV. Newton’s second law can be derived from the universal law of gravity.

Which of the following statements are true?

A 10-kg plastic block is at rest on a flat wooden surface. The coefficient of static friction between wood and plastic is 0.6 and the coefficient of kinetic friction is 0.5. How much horizontal force is needed to start the plastic box moving?

A 75-kg ice skater moving eastward at 5 m/s collides with a 100-kg skater moving northward at 4 m/s. Anticipating the collision, they hug each other and produce an inelastic collision. What is their final speed?

A ball is released from a certain height along a frictionless track that does a loop-the-loop. The loop-the-loop part of the track is a perfect circle of radius R. At what height above the ground must the ball be released from in order to not fall off the track when it gets to the top of the loop-the-loop?

Two waves, each of which has an amplitude of A, cross paths. At the point where they cross, the peak of one wave meets the trough of another wave. What is the resulting amplitude at the point where the waves cross?

Two tuning forks have a frequency of 500 Hz and 504 Hz and the same amplitude. How much time is there between beats?