Essential Physics Practice Exam
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Which one of the following is a conductor?
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Straw
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Metal
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Wool
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Wool
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Take this quiz to help you prepare for your final. You will want a calculator and your equation list from your review handy.
I will not see the results of your quiz unless you print out or email me the completion certificate. Do this if you want some bonus points! (email: rachael. Hubbard@has-k12. Org)
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- 2.
The phase with the most energetic molecules is
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Solid
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Liquid
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Gas
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Absolute zero
Correct Answer
A. GasExplanation
Gas molecules have the highest energy compared to molecules in other phases. In the gas phase, molecules are not bound together and are free to move around rapidly and collide with each other. This constant motion and collision result in higher kinetic energy, making gas molecules more energetic than those in the solid or liquid phases. Absolute zero, on the other hand, refers to the lowest possible temperature where all molecular motion ceases, so it does not represent a phase with energetic molecules.Rate this question:
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- 3.
The push or pull on an object causing it to accelerate is
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Speed
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Density
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Force
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Mass
Correct Answer
A. ForceExplanation
Force is the correct answer because it is the push or pull on an object that causes it to accelerate. Acceleration is directly proportional to the force applied on an object, according to Newton's second law of motion. The greater the force, the greater the acceleration. Therefore, force is the fundamental factor that causes an object to change its motion.Rate this question:
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- 4.
Like charges
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Attract
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Repel
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Balance one another
Correct Answer
A. RepelExplanation
Like charges repel each other because they have the same charge. According to the principle of electrostatics, like charges create an electric field that pushes them away from each other. This is due to the fact that like charges have a mutual force of repulsion, causing them to move apart and maintain a certain distance between them.Rate this question:
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- 5.
____ waves would cause a sunburn
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Gamma
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Radio
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UV
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X-ray
Correct Answer
A. UVExplanation
UV waves would cause a sunburn. UV stands for ultraviolet, which is a type of electromagnetic radiation that is emitted by the sun. When the skin is exposed to UV radiation for a prolonged period of time, it can cause damage to the skin cells, leading to a sunburn. UV rays are classified into three types: UVA, UVB, and UVC. UVB rays are primarily responsible for sunburns, as they have a shorter wavelength and higher energy compared to UVA rays. Therefore, it is important to protect the skin from UV radiation by wearing sunscreen, protective clothing, and seeking shade.Rate this question:
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- 6.
The phase of matter with a definite chape and volume is
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Plasma
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Liquid
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Gas
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Solid
Correct Answer
A. SolidExplanation
A solid is the phase of matter that has a definite shape and volume. Unlike liquids and gases, solids do not flow and maintain their shape and volume under normal conditions. The particles in a solid are closely packed together and have strong intermolecular forces that hold them in place. This arrangement allows solids to maintain their shape and volume, making them distinct from other phases of matter.Rate this question:
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- 7.
Tension breaker: Pizza is
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Delicious
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Just ok
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Gross
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For sissies
Correct Answer
A. DeliciousExplanation
The given correct answer "delicious" suggests that pizza is enjoyable and flavorful. It implies that the taste of pizza is highly satisfying and appealing to most people. This answer indicates that the person who chose it finds pizza to be a delicious food option.Rate this question:
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- 8.
The average speed of a car that travels 150 km in 3 hours is
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10 km/h
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25 km/h
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50 km/h
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100 km/h
Correct Answer
A. 50 km/hExplanation
The average speed of a car is calculated by dividing the total distance traveled by the total time taken. In this case, the car travels 150 km in 3 hours. Dividing 150 km by 3 hours gives an average speed of 50 km/h.Rate this question:
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- 9.
Ohms () is the unit of measurement for
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Current
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Resistance
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Voltage
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Temperature
Correct Answer
A. ResistanceExplanation
The unit of measurement for resistance is Ohms. Resistance is a property of a material that hinders the flow of electric current. It is measured in Ohms, symbolized by the Greek letter omega (Ω). Resistance is important in determining the amount of current that can flow through a circuit and is used in various electrical calculations and circuit designs.Rate this question:
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- 10.
The way in which energy travels the length of a metal is
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Radiation
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Convection
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Conduction
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Conviction
Correct Answer
A. ConductionExplanation
Conduction is the correct answer because it refers to the process of energy transfer through direct contact between particles in a substance, such as metal. In conduction, energy is transferred from higher energy particles to lower energy particles, causing them to vibrate and pass on the energy to neighboring particles. This transfer occurs without the actual movement of the particles themselves.Rate this question:
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- 11.
Electromagnetic waves with the longest wavelengths have
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The highest energy
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The lowest frequency
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The most damaging effects
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The highest frequency
Correct Answer
A. The lowest frequencyExplanation
Electromagnetic waves with the longest wavelengths have the lowest frequency. Frequency refers to the number of wave cycles that pass a given point in a second. Longer wavelengths correspond to a lower frequency, as the wave cycles take more time to complete. In the electromagnetic spectrum, waves with longer wavelengths include radio waves and microwaves. These waves have lower energy compared to waves with higher frequencies, such as X-rays and gamma rays. Therefore, the correct answer is the lowest frequency.Rate this question:
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- 12.
Energy is measured in
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Newtons
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Amps
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Joules
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Kilograms
Correct Answer
A. JoulesExplanation
Energy is a physical quantity that is measured in joules. Joules are the standard unit of measurement for energy in the International System of Units (SI). Newtons are a unit of force, amps are a unit of electric current, and kilograms are a unit of mass. None of these units are appropriate for measuring energy. Therefore, the correct answer is joules.Rate this question:
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- 13.
Ultraviolet light is an example of
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Heat energy
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Electromagnetic energy
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Potential energy
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Electrical energy
Correct Answer
A. Electromagnetic energyExplanation
Ultraviolet light is a form of electromagnetic energy. Electromagnetic energy consists of waves that vary in frequency and wavelength, and ultraviolet light falls within this spectrum. It is characterized by its high energy and shorter wavelength compared to visible light. Ultraviolet light is commonly associated with the sun's rays and is responsible for causing sunburns and tanning.Rate this question:
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- 14.
Between A and B the car
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Slowed down
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Sped up
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Had no acceleration
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Stopped
Correct Answer
A. Had no accelerationExplanation
The correct answer is "had no acceleration" because the sentence states that the car was between A and B. The options "slowed down," "sped up," and "stopped" all indicate a change in speed or motion, which contradicts the statement that the car had no acceleration. Therefore, the only option left is "had no acceleration," which implies that the car maintained a constant speed between points A and B.Rate this question:
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- 15.
Energy produced by the sun is
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Nuclear
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Chemical
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Electrical
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Mechanical
Correct Answer
A. NuclearExplanation
The sun produces energy through nuclear reactions, specifically nuclear fusion. In the sun's core, hydrogen atoms combine to form helium, releasing a tremendous amount of energy in the process. This energy is then radiated outwards as sunlight and other forms of electromagnetic radiation. Therefore, the correct answer is nuclear.Rate this question:
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- 16.
Pedaling a bike is an example of
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Potential energy
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Thermal energy
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Mechanical energy
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Heat energy
Correct Answer
A. Mechanical energyExplanation
Pedaling a bike involves the conversion of human energy into the mechanical energy required to move the bike. Mechanical energy refers to the energy associated with the motion and position of objects. When a person pedals a bike, they apply force to the pedals, which causes the bike to move. This movement is a form of mechanical energy, as it involves the transfer of energy from the person's muscles to the bike's wheels. Therefore, pedaling a bike is an example of mechanical energy.Rate this question:
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- 17.
Between which interval was the greatest negative acceleration?
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AB
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BC
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CD
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DE
Correct Answer
A. BCExplanation
The greatest negative acceleration occurred between points B and C.Rate this question:
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- 18.
All Energy adheres to the Law of Conervation of Energy. Why is a light bulb not 100% efficient?
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New light bulbs are 100% efficient
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All energy transfers lose energy in the form of heat
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Tungsten wire in light bulbs are weak
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Of all energy transfers, light bulbs are least efficient
Correct Answer
A. All energy transfers lose energy in the form of heat -
- 19.
When submimation occurs,
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Solid is converted to gas
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Solid is converted to liquid
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Gas is converted to liquid
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Water melts
Correct Answer
A. Solid is converted to gasExplanation
When sublimation occurs, solid is converted directly into gas without going through the liquid phase. This process happens when the temperature and pressure conditions are such that the solid particles gain enough energy to break their intermolecular bonds and escape into the gas phase. This is exemplified by substances like dry ice (solid carbon dioxide) which sublimes at room temperature, going from a solid state directly to a gaseous state.Rate this question:
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- 20.
Frequency is measured in
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Meters
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Hertz
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Decibels
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Meters per second
Correct Answer
A. HertzExplanation
Frequency is a measure of how many cycles or oscillations occur in a given time period. It is commonly used to describe the rate at which a wave, such as sound or electromagnetic waves, repeats itself. Hertz is the unit used to measure frequency, representing one cycle per second. Therefore, Hertz is the correct answer as it is the appropriate unit for measuring frequency.Rate this question:
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- 21.
Why do you hear thunder after you see lightning?
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Light and sound travel at the same speeds
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Sound is faster than light
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Light is faster than sound
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Sound is faster in certain temperatures
Correct Answer
A. Light is faster than soundExplanation
When lightning occurs, it produces both light and sound. Light travels at a much faster speed than sound, which is why we see the flash of lightning before we hear the thunder. The speed of light is approximately 299,792 kilometers per second, while the speed of sound is only around 343 meters per second. This significant difference in speed causes the delay between seeing the lightning and hearing the thunder.Rate this question:
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- 22.
A police using a radar gun is using ___ waves
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Gamma
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Radio
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UV
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X-ray
Correct Answer
A. RadioExplanation
A police using a radar gun is using radio waves. Radar guns use radio waves to detect the speed of moving vehicles. These waves are transmitted from the radar gun and bounce off the target vehicle, then the radar gun measures the time it takes for the waves to return. Based on this time measurement, the radar gun can calculate the speed of the vehicle. Therefore, the correct answer is radio.Rate this question:
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- 23.
Current is measured using
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Coulombs
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Amps
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Ohms
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Volts
Correct Answer
A. AmpsExplanation
Current is measured using amps, which is short for amperes. Amps is a unit of measurement for electric current. It represents the rate at which electric charge flows in a circuit. Coulombs, ohms, and volts are also related to electric current but they are not used to directly measure it. Coulombs measure the quantity of electric charge, ohms measure resistance, and volts measure electric potential difference. Therefore, the correct answer is amps.Rate this question:
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- 24.
Bats use ____ to locate food and navigate
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Acoustics
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Resonance
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Echolocation
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Infrared
Correct Answer
A. EcholocationExplanation
Bats use echolocation to locate food and navigate. Echolocation is a process where bats emit high-frequency sounds and listen to the echoes that bounce back from objects in their surroundings. By analyzing the time it takes for the sound to return and the changes in frequency, bats can determine the location, distance, and size of objects. This ability allows them to navigate in the dark and find their prey with remarkable precision.Rate this question:
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- 25.
A wave has a wavelength of 3 m and a frequency of 6Hz. What is the speed of the wave?
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2 m/s
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9 m/s
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18 m/s
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0.5 m/s
Correct Answer
A. 18 m/sExplanation
The speed of a wave can be calculated by multiplying the wavelength by the frequency. In this case, the wavelength is 3 m and the frequency is 6 Hz. Multiplying these values together gives us a speed of 18 m/s.Rate this question:
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- 26.
The tendency of matter to resist a change in motion is ___
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Gravity
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Inertia
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Friction
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Resistance
Correct Answer
A. InertiaExplanation
Inertia is the tendency of matter to resist a change in motion. It is a property of matter that causes objects to resist changes in their velocity or direction. This resistance to change is why objects at rest tend to stay at rest, and objects in motion tend to stay in motion, unless acted upon by an external force. Inertia is related to an object's mass, with more massive objects having greater inertia. Therefore, inertia is the correct answer for the given question.Rate this question:
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- 27.
What voltage produces a current of 300 amps with a resistance of 20 Ohms?
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6000 volts
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600 volts
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15 volts
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0.15 volts
Correct Answer
A. 6000 voltsExplanation
The correct answer is 6000 volts. According to Ohm's Law, the voltage is equal to the current multiplied by the resistance. In this case, the current is 300 amps and the resistance is 20 Ohms. Therefore, the voltage can be calculated as 300 amps multiplied by 20 Ohms, which equals 6000 volts.Rate this question:
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- 28.
Sound waves with frequencies above the normal human range of hearing are
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Infrasound
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Untrasound
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Decibels
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Resonance
Correct Answer
A. UntrasoundExplanation
The correct answer is "untrasound." Sound waves with frequencies above the normal human range of hearing are referred to as ultrasound. Ultrasound waves have frequencies higher than 20,000 Hz, which is the upper limit of human hearing. Ultrasound is commonly used in medical imaging, such as ultrasound scans during pregnancy, as well as in various industrial and scientific applications.Rate this question:
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- 29.
Which temperature scale does water have a boiling point of 100 and a freezing point of 0
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Fahrenheit
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Celsius
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Kelvin
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Rankine
Correct Answer
A. CelsiusExplanation
Water has a boiling point of 100 degrees Celsius and a freezing point of 0 degrees Celsius. This means that the Celsius temperature scale is the correct answer. Fahrenheit has a boiling point of 212 degrees and a freezing point of 32 degrees, Kelvin has a boiling point of 373.15 degrees and a freezing point of 273.15 degrees, and Rankine has a boiling point of 671.67 degrees and a freezing point of 491.67 degrees.Rate this question:
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- 30.
The circuit shown below is
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An open circuit
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A series circuit
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A parallel circuit
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Both series and parallel circuits
Correct Answer
A. A parallel circuitExplanation
The circuit shown below is a parallel circuit because there are multiple paths for current to flow. In a parallel circuit, the components are connected in such a way that the current has alternative paths to follow. This means that if one component fails or is removed, the other components can still function independently. In the given circuit, the two resistors are connected in parallel, allowing current to flow through both of them simultaneously.Rate this question:
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- 31.
The temperature in which particles would not be moving
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32 degrees F
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-273 Kelvin
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0 degrees Celsius
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Absolute Zero
Correct Answer
A. Absolute ZeroExplanation
Absolute zero is the temperature at which particles would not be moving. It is the lowest possible temperature, where the kinetic energy of particles reaches its minimum. At this temperature, all molecular motion ceases, and atoms and molecules have no thermal energy. Absolute zero is equivalent to 0 Kelvin or -273 degrees Celsius. 32 degrees Fahrenheit is above absolute zero and particles would still be moving at this temperature.Rate this question:
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- 32.
____ waves can transfer energy without a medium
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Sound
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Electromagnetic
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Longitudinal
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Surface
Correct Answer
A. ElectromagneticExplanation
Electromagnetic waves can transfer energy without a medium because they consist of oscillating electric and magnetic fields that can propagate through empty space. Unlike sound waves, which require a medium (such as air or water) to travel, electromagnetic waves can travel through a vacuum, making them capable of transmitting energy over long distances. This property of electromagnetic waves is fundamental to various technologies, including wireless communication, radio waves, and light.Rate this question:
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- 33.
When white light strikes a black object,
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No light is reflected
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All light is reflected
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Some light is reflected
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Light passes through the object
Correct Answer
A. No light is reflectedExplanation
When white light strikes a black object, no light is reflected. This is because black objects absorb all the wavelengths of light and do not reflect any of them back to our eyes. Instead, the light is converted into heat energy. Therefore, we perceive black objects as being devoid of any reflected light.Rate this question:
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- 34.
Clear glass is ____ while frosted glass is ___
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Opaque, transparent
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Translucent, opaque
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Translucent, transparent
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Transparent, translucent
Correct Answer
A. Transparent, translucentExplanation
Clear glass is transparent, meaning that light can pass through it easily and objects can be seen clearly on the other side. Frosted glass, on the other hand, is translucent, meaning that it scatters and diffuses light, making objects on the other side blurry or indistinct. While some light can still pass through frosted glass, it is not as clear or transparent as clear glass.Rate this question:
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- 35.
If the velocity of an object is 1m/s, then increases to 2 m/s, what will happen to the kinetic energy of the object?
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It is reduced by 2
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It stays the same
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It will double
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It will be multiplied by 4
Correct Answer
A. It will be multiplied by 4Explanation
When the velocity of an object increases from 1 m/s to 2 m/s, the kinetic energy of the object is directly proportional to the square of its velocity. Therefore, when the velocity is doubled, the kinetic energy will be multiplied by 4 (2^2), resulting in an increase in kinetic energy.Rate this question:
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- 36.
When light passes from air to water,
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It speeds up
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It slows down
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It continues at the same speed
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It stops completely
Correct Answer
A. It slows downExplanation
When light passes from air to water, it slows down. This is because light travels at different speeds in different mediums. In air, light travels at a faster speed compared to water. When it enters water, the molecules of the water cause the light to interact and slow down. This change in speed is known as refraction.Rate this question:
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- 37.
Your weight is different than your mass because
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Mass is the force of gravity acting on your weight
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Weight is the force of gravity acting on your mass
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Weight takes kinetic energy into account
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Weight and mass are always the same
Correct Answer
A. Weight is the force of gravity acting on your massExplanation
Weight is the force of gravity acting on your mass. Weight is a measure of the gravitational force pulling an object towards the center of the Earth. It is dependent on the mass of the object and the acceleration due to gravity. Mass, on the other hand, is a measure of the amount of matter in an object and remains constant regardless of the location or gravitational field. Therefore, weight and mass are different because weight is influenced by gravity while mass is not.Rate this question:
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- 38.
Point C represents the melting point of a substance. What would Point E represent?
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Freezing
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Melting
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Sublimation
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Vaporization
Correct Answer
A. VaporizationExplanation
Point E represents vaporization because it is the process by which a substance changes from a liquid to a gas. The melting point, represented by Point C, is the temperature at which a substance changes from a solid to a liquid. Therefore, Point E, which is located after Point C, would represent the next phase transition in which the substance changes from a liquid to a gas.Rate this question:
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- 39.
The speed of a wave is 20m/s and the frequency is 100Hz. What is the wavelength?
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0.2m
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5m
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2000m
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2m
Correct Answer
A. 0.2mExplanation
The speed of a wave is determined by the product of its wavelength and frequency. In this case, the speed is given as 20m/s and the frequency is given as 100Hz. To find the wavelength, we can rearrange the formula to solve for it. Wavelength = Speed / Frequency. Plugging in the values, we get Wavelength = 20m/s / 100Hz = 0.2m. Therefore, the correct answer is 0.2m.Rate this question:
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- 40.
____ waves have the shortest wavelengths
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Gamma
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Radio
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UV
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X-ray
Correct Answer
A. GammaExplanation
Gamma waves have the shortest wavelengths among the given options. Gamma waves are a type of electromagnetic radiation with high frequency and energy. They have wavelengths shorter than UV, x-ray, and radio waves. Gamma waves are often associated with nuclear reactions, radioactive decay, and high-energy particles. Due to their short wavelengths and high energy, gamma waves have the ability to penetrate through matter and are commonly used in medical imaging and radiation therapy.Rate this question:
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- 41.
A 9 volt battery produces a current of 45 amperes. What is the resistance?
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405 ohms
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5 ohms
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0.2 ohms
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There is no resistance
Correct Answer
A. 0.2 ohmsExplanation
The given answer of 0.2 ohms suggests that the resistance in the circuit is 0.2 ohms. This can be determined using Ohm's Law, which states that resistance (R) is equal to voltage (V) divided by current (I). In this case, the voltage is 9 volts and the current is 45 amperes. Therefore, the resistance can be calculated as 9 volts divided by 45 amperes, which equals 0.2 ohms.Rate this question:
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- 42.
In this diagram, wavelength is labeled __
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A
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B
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C
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D
Correct Answer
A. D -
- 43.
Sound is a ___ wave
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Surface
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Transverse
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Longitudinal
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Electromagnetic
Correct Answer
A. LongitudinalExplanation
Sound is a longitudinal wave because it travels by compressing and expanding the particles of the medium it is passing through. In a longitudinal wave, the particles of the medium vibrate parallel to the direction of the wave propagation. This means that the particles move back and forth in the same direction that the wave is moving.Rate this question:
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- 44.
In the energy transfer diagram of a battery and a light bulb,
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Heat energy is transferred to chemical energy
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Chemical energy is transferred to mechanical energy
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Electrical energy is transferred to mechanical energy
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Electrical energy is transferred to light (electromagnetic) energy
Correct Answer
A. Electrical energy is transferred to light (electromagnetic) energyExplanation
The correct answer is electrical energy is transferred to light (electromagnetic) energy. This is because a battery provides electrical energy, which is then transferred to the light bulb. Inside the light bulb, electrical energy is converted into light energy, which is a form of electromagnetic energy.Rate this question:
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- 45.
What is the speed of the car plotted on this graph?
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5 m/s
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10 m/s
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20 m/s
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50 m/s
Correct Answer
A. 10 m/sExplanation
Based on the given graph, the speed of the car is represented by the y-axis, which indicates the value of 10 m/s. This means that the car's speed is 10 meters per second according to the plotted data.Rate this question:
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- 46.
A magic turtle has a mass of 47kg and can run 31 m/s. What is his kinetic energy?
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22583.5 J
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68479 J
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1739 J
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34239.5 J
Correct Answer
A. 22583.5 JExplanation
The kinetic energy of an object is given by the formula KE = 0.5 * mass * velocity^2. In this case, the mass of the magic turtle is given as 47kg and the velocity is given as 31 m/s. Plugging these values into the formula, we get KE = 0.5 * 47 * (31^2) = 22583.5 J. Therefore, the correct answer is 22583.5 J.Rate this question:
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- 47.
Opaque objects reflect some wavelengths of light a ___ the rest
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Refract
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Absorb
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Diffuse
Correct Answer
A. AbsorbExplanation
Opaque objects are those that do not transmit light. Instead, they absorb most of the wavelengths of light that hit them, reflecting very little or none at all. This absorption of light is what causes these objects to appear dark or non-transparent. Therefore, the correct answer is "absorb".Rate this question:
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- 48.
A car moving at constant velocity has what forces acting upon it? (Check all that apply)
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Friction
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Air resistance
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Gravity
Correct Answer(s)
A. Friction
A. Air resistance
A. GravityExplanation
A car moving at a constant velocity experiences three forces acting upon it: friction, air resistance, and gravity. Friction occurs between the tires and the road surface, which allows the car to move forward. Air resistance is the force exerted by the air on the moving car, opposing its motion. Gravity is the force that pulls the car downward, keeping it on the ground. These three forces work together to maintain the car's constant velocity.Rate this question:
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- 49.
When you drag your book across a table, friction will convert
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Kinetic energy to potential energy
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Kinetic energy to thermal energy
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Potential energy to wavelengths
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Potential energy to kinetic energy
Correct Answer
A. Kinetic energy to thermal energyExplanation
When you drag your book across a table, friction between the book and the table surface will cause the book to slow down. This decrease in kinetic energy is converted into thermal energy, as the friction generates heat. Therefore, the correct answer is "kinetic energy to thermal energy."Rate this question:
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