# This Physics Quiz Is Really Hard, So We'll Be Impressed If You Get Even 10 Right

By: Lauren Lubas
4 min
Image: Jon Feingersh Photography Inc / DigitalVision / Getty Images

Every action has an equal and opposite reaction. Someone took math and science and forced them together, and the reaction to that was physics. Physics is one of the most difficult subjects for people to wrap their minds around because it takes the concepts that hard sciences like biology give us and adds the most difficult math equations you can think of. Just knowing the basics of physics is a lot for one brain to handle, and in this quiz, we're taking it to a whole new level. We're exploring the concepts, equations, laws and theories that made physics what it is today: really, really hard to understand.

We know this quiz is going to be tough, but we promise to start you off with a few easier questions to warm you up ... just don't be surprised if you get a few of these wrong. As a matter of fact, we don't expect you to get more than 10 right, but we'll be really impressed if you do.

What are you waiting for? An object at rest will remain at rest until an outside force moves it ... It's time to be that outside force and scroll down to start answering questions!

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Can you tell us what a watt is?
Unit for power
Unit for force
Unit for pressure
Unit for weight

In general, watts refer to how much power is in an electrical circuit. If you're ever out buying light bulbs, you will see the wattage of bulbs can be different. This shows how much light the bulb can produce, if put in a proper socket.

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A ball breaks through a window and continues moving at a constant speed. Why didn't the window stop it?
Microwaves
Inertia
The window resisted the break.
The ball doesn't abide by the rules of physics.

Inertia is an object's ability to resist change based on the composition of an object. This means that the ball didn't change momentum as it crashed through the glass because it was denser than the glass itself.

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If you fall with no force other than gravity, what kind of fall are you in?
Sea fall
Free fall
Gravitational fall
Marker fall

When someone or something is in a free fall, there is no other force affecting their speed or acceleration than gravity. For example, a skydiver simply falls from the plane and allows gravity to help them accelerate.

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Two things are pressed together and there is no heat transfer. What is this called?
Anticlimactic
Thermal equilibrium
Unusable data
Microtransfer

Thermal equilibrium is a term used for two different objects that are of the same temperature. There is no heat transfer between them because neither is taking heat or releasing heat.

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What is the ratio of the size of an object compared to the size of the image of an object?
Enhancement
Magnification
Microfication
Telescopic ratio

There are times when science has a tendency to make things a little more complicated than they have to be. Physics is no different. Magnification is when the image of something is a different size than the actually object.

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If two light nuclei come together to form a heavier nucleus, what is happening?
Nuclear fission
Nuclear fusion
Nuclear meltdown

When nuclear fusion occurs, you will also see a reaction in the form of a release or absorption of energy. Nuclear fusion requires extremely high temperatures to actually happen.

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Why does it appear that some bugs can walk on water?
They have floating legs.
They don't really land on the water.
Microabrasian
Surface tension

Surface tension isn't exclusive to water. As a matter of fact, nearly every liquid has some amount of surface tension. This property of liquids functions very much like a membrane over it, adding resistance.

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If something is infrasonic, what is it?
Humans can't hear it.
It annoys humans.
It disrupts human hearing.
It injures human hearing.

Infrasonic sound waves at a frequency so low that it cannot be heard by human ears. This frequency has to be less than 20Hz. However, if the pressure is high enough, humans can still perceive it.

What kind of series is the Lyman series?
Podcast series
Spectral series
Book series

The hydrogen atom is rather unique. The Lyman series refers to a group of lines (or a spectral series) within the ultraviolet region on the hydrogen spectrum. It is created when electrons move from one energy level to another within the atom.

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Can you tell us what a half-life is?
The amount of mass that is lost after 50 years
The pressure that is needed to disintegrate half of the atoms in an element
The amount of time it takes for half of the atoms in an element to disintegrate
The outside forces that disintegrate an atom

A half-life also refers to the time it takes for the radioactivity of an isotope to be cut in half. Many elements have half-lifes that are much longer than you'd think. For example, Plutonium 239's half-life is over 24,000 years.

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The force with which a body is attracted to the center of the Earth based on its mass is called what?
Height
Weight
Mass
Milligrams

While many people think of weight as how heavy something is, in physics terms, weight actually refers to force. You can figure out the weight of something by multiplying mass by gravity.

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What exactly is a vibration?
Pressure
Time multiplied by speed
Light
A back and forth motion

Sound waves create vibrations. These vibrations are actually just a consistent motion that repeats itself, moving back and forth. The oscillations come from an equilibrium point and fan outward.

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What is work?
Pressure multiplied by force
Heat multiplied by pressure
Force multiplied by displacement
A unit of measurement for mass

While many believe that work is something that you show up to every day, the true definition of work requires something to move or function. You can push on a brick wall until you're sweating, but if that wall doesn't move, you're not doing any work.

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Matter and energy can both pass through what?
An open system
A closed system
An electrical system
The Fornum system

There are open systems and closed systems. In open systems, mass and energy can be lost or gained from the environment alone. On the other hand, closed systems don't interact with their environments.

What do you have to do to a spectral line to get the Zeeman effect?
Expose it to heat
Expose it to water
Expose it to cold
Expose it to a magnet

A spectral line is a dark or bright line that occurs in a uniform spectrum. When you place a magnet to this spectrum, you can see the line begin to spit off. This is the Zeeman effect.

This Old Tony
According to Hooke's law, stress and what are directly proportional in an elastic limit?
Sprain
Strain
Mass
Width

When it comes to elasticity, Hooke's law explains what is needed to expand or contract a spring. The law states that stress and strain applied to an object must be proportional to achieve a goal.

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Do you know what an ice-point is?
The temperature ice cracks under atmospheric pressure
The pressure used to create ice without changing temperature
The mass of ice before it stops floating
The temperature ice melts based on regular atmospheric pressure

The ice-point and the melting-point of ice are the same thing. It seems odd to call a melting-point an ice-point, but the temperature is consistent. It is either 32 degrees F or 0 degrees C.

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What is the steam-point of water?
100 degrees F
212 degrees F
50 degrees F
32 degrees F

A steam-point doesn't necessarily refer to the temperature of the water itself. It actually is more specific to the steam above boiling water. In any case, at sea level, the steam-point of water is 212 degrees F.

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When a system changes but the temperature does not, what is it called?
Interthermal process
Semi-thermal process
Anti-thermal process
Isothermal process

An isothermal process is necessary for creating reactions at slower speeds. They usually happen when the system (or the thing being changed) is changed very slowly with the help of a thermal reservoir or a heat bath.

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Do you know which frequency is considered a ultrasonic sound?
19,254 Hz
17,201 Hz
21,574 Hz
4,748 Hz

Ultra sonic sound is any sound wave that has a frequency that is higher than a human's ability to hear it properly. That means any frequency over 20,000 Hz is considered ultrasonic.

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What is the lowest energy state of an atom called?
Rest state
Fall state
Microstate
Ground state

The ground state of an atom is also called the zero-point energy of the system. The opposite of the ground state is known as the excited state, which is an a state that is anything above the ground state.

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Do you know what luminosity is?
The amount of light that creates heat from a source
The amount of time it takes for light to become visible
The distance light is able to travel from a stationary source
The amount of energy radiated from a source per second

In physics, luminosity doesn't necessarily have to refer to light. It can refer to energy that isn't visible as well. It mostly refers to the amount of radiation that is emitted from a single source.

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Can you pick the wave that is NOT considered a mechanical wave?
Sound wave
Water wave
Light wave
Jump rope wave

The only item on this list that is not a mechanical wave is a light wave. Light waves are considered electromagnetic waves because they can travel through a vacuum (like space), whereas mechanical waves cannot.

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Can you figure out which of these has nearly zero electrical resistance?
Megaconductor
Ultraconductor
Superconductor
Insulation

When it comes to the way electricity moves, nearly everything gives a little resistance. However, there are some materials that will reduce the resistance almost to zero under the right conditions.

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Which law states that the radius vector joining the planet to the sun covers equal areas in equal intervals of time?
Kepler's first law of planetary motion
Kepler's second law of planetary motion
Newton's fourth law of gravity
Lenz's law

In the 1600s, Kepler created three laws of planetary motion based on his observations of the stars. Each of these laws still holds up today based on our reviews of how the planets move and interact with other celestial bodies.

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What is the ideal gas equation?
G = MC^2
M = GHB
PV = nRT
Y=N^6

The ideal gas equation describes the state of a hypothetical gas (or ideal gas). The P, V and T stand for pressure, volume and absolute temperature. The n represents moles of gas while R stands for the constant of the ideal gas.

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Which of these does NOT effect natural frequency?
Size
Composition
Shape
Air resistance

To properly record the natural frequency of an oscillating object, you have to first ensure that there are no external forces affecting it. This will help you understand how the object moves without outside factors.

Do you know what this equation is for? Q = I^2 Rt
Kelvin's law of heating
Relative mass
Joule's law of heating
Kinetic energy

Joule's law of heating defines the heat that is produced by an object. In this equation, the I stands for the current flowing through a resistor (represented by the r) over a given time (t). Q represents the heat that is produced.

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Do you remember Newton's third law of motion?
An object in motion will stay in motion until an outside force stops it.
There is no third law of motion.
Every action has an equal and opposite reaction.
The gravitational attraction of two particles is proportional to their mass.

There are three laws of motion, according to Newton. While you might not be able to see the fact that every action has an equal and opposite reaction (because it can be subtle sometimes), this law has yet to be disproved.

Which of these describes the spin orientation of an electron?
Spin quantum number
Spinnerette
Quantum angle number
Tilt axis number

The energy state of electron waves have four different descriptions. Of these four descriptions, the spin quantum number represents the orientation as it relates to an outside magnetic field.

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What is the lowest frequency a wave can vibrate freely known as?
Fundamental frequency
Ground frequency
Low frequency
No frequency

For those who study frequencies, the fundamental frequency is referred to as the fundamental. It is the lowest possible frequency of a wave form. For example, in music, it is the lowest pitch of a note.

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If a nucleus contains three protons and two neutrons, what is its mass number?
Five
There isn't enough information to answer this question.
Six
Nine

In order to figure out the mass number of a nucleus, you have to first know how many protons and neutrons it has. If you know these two numbers, simply add them together and you have the mass number.

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How would you describe thermal capacity to someone?
The amount of outside heat added to something to raise its temperature by one degree
The amount of heat something can hold
The amount of heat a solid can withstand before turning into a liquid
The amount of heat something releases.

When you consider the definition of thermal capacity, it's important to note that the entire object or body needs to raise by one degree before the proper capacity can be calculated.

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You're running an experiment to figure out how much heat you need to convert something from a liquid to a gas. What are you looking for?
The latent heat of vaporization
The despondent heat of vaporization
The vapor point
The Kelvin code

The latent heat of vaporization refers to the amount of heat that is needed to convert a specified amount of liquid into its gaseous form. Here's the catch: when you're looking for the latent heat of vaporization, you can't change the temperature of the liquid. You simply have to add energy.

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How many watts are in one unit of horsepower?
746
521
198
Horsepower is not measured in watts