1.
Who developed the Second Law of Motion that is described by the equation F=ma?
Correct Answer
D. Isaac Newton
Explanation
Isaac Newton developed the Second Law of Motion, which is described by the equation F=ma. This law states that the force acting on an object is equal to the mass of the object multiplied by its acceleration. Newton's contribution to physics and his formulation of the laws of motion revolutionized our understanding of how objects move and interact with each other.
2.
Momentum is to force as angular momentum is to what?
Correct Answer
B. Torque
Explanation
Momentum is a measure of an object's motion, while force is the cause of that motion. Similarly, angular momentum is a measure of an object's rotational motion, and torque is the cause of that rotational motion. Torque is the rotational equivalent of force, so it is the correct analogy for the relationship between momentum and force. Barycenter refers to the center of mass in a system, work is the transfer of energy, and moment of inertia is a property of an object related to its rotational inertia.
3.
In a circuit, what is the ratio of the voltage drop and current flow between two points?
Correct Answer
D. Resistance
Explanation
Resistance is the correct answer because it represents the ratio of voltage drop to current flow in a circuit. Resistance is a measure of how much a material or component opposes the flow of electric current. It is measured in ohms (Î©) and is determined by the material's properties and the physical dimensions of the component. A higher resistance value indicates a greater opposition to current flow, resulting in a larger voltage drop across the component.
4.
If you throw a ball in the air, what curve does it trace out?
Correct Answer
C. Parabola
Explanation
When a ball is thrown in the air, it follows a parabolic trajectory. This is because the force of gravity acts on the ball, causing it to accelerate downwards. As a result, the ball follows a curved path known as a parabola. The shape of a parabola is determined by the equation y = ax^2 + bx + c, where a, b, and c are constants. The path of the ball can be described by this equation, with the vertex of the parabola representing the highest point the ball reaches before falling back down. Therefore, the correct answer is Parabola.
5.
What kind of electromagnetic radiation arises only from nuclear excitations?
Correct Answer
C. Gamma Rays
Explanation
Gamma rays are a type of electromagnetic radiation that arises only from nuclear excitations. When an atomic nucleus undergoes an energy transition or decay, it emits gamma rays. These high-energy photons have the shortest wavelengths and highest frequencies in the electromagnetic spectrum. Gamma rays are commonly produced by radioactive decay, nuclear reactions, and nuclear explosions. They have various applications in medicine, industry, and research, including cancer treatment, sterilization, and imaging. Unlike microwaves, X-rays, and ultraviolet light, which can also be produced by other processes, gamma rays specifically originate from nuclear excitations.
6.
According to Ohm's Law, what would the resistance be in a circuit with 40 volts and 8 amps?
Correct Answer
D. 5 Ohms
Explanation
According to Ohm's Law, the resistance in a circuit can be calculated by dividing the voltage (V) by the current (I). In this case, the voltage is 40 volts and the current is 8 amps. Therefore, the resistance would be 40 volts divided by 8 amps, which equals 5 Ohms.
7.
What is the Doppler effect?
Correct Answer
B. The Observed Change In Frequency Of A Moving Object
Explanation
The Doppler effect refers to the observed change in frequency of a moving object. This phenomenon occurs when there is relative motion between the source of a wave (such as sound or light) and an observer. As the source moves closer to the observer, the frequency of the waves appears higher, resulting in a higher pitch (for sound waves) or a shift towards the blue end of the spectrum (for light waves). Conversely, as the source moves away from the observer, the frequency appears lower, resulting in a lower pitch or a shift towards the red end of the spectrum. This effect is commonly experienced with sound waves from a moving vehicle or with the light from distant stars.
8.
Which of these is a scientific definition for the term "matter"?
Correct Answer
B. Anything That Has A Mass
Explanation
The scientific definition of "matter" is anything that has a mass. Mass is a fundamental property of matter and refers to the amount of substance present in an object. This definition is based on the understanding that matter is composed of atoms and molecules, which have mass. Therefore, anything that possesses mass, regardless of its size or state, is considered to be matter.
9.
In math, "pi" is equal to?
Correct Answer
B. 3.141592654
Explanation
Pi is a mathematical constant that represents the ratio of a circle's circumference to its diameter. It is approximately equal to 3.141592654. It is an irrational number, meaning it cannot be expressed as a simple fraction, and its decimal representation goes on forever without repeating. Pi is used in various mathematical calculations and is a fundamental concept in geometry and trigonometry.
10.
What is the closest value of pi?
Correct Answer
D. 3.14
Explanation
The closest value of pi is 3.14. This is because pi is approximately equal to 3.14159, and 3.14 is the closest value given in the options provided.
11.
What is the energy of motion called?
Correct Answer
B. Kinetic Energy
Explanation
Kinetic energy refers to the energy possessed by an object due to its motion. It is the energy that an object possesses when it is in motion and is dependent on its mass and velocity. This energy can be transferred from one object to another and can be converted into other forms of energy. Therefore, kinetic energy is the appropriate term to describe the energy of motion.
12.
Which scientific term means "measure of resistance to flow in a liquid"?
Correct Answer
C. Viscosity
Explanation
Viscosity is the scientific term that refers to the measure of resistance to flow in a liquid. It describes the internal friction of a fluid and determines how easily it flows. Liquids with high viscosity, such as honey or molasses, flow slowly, while liquids with low viscosity, like water or oil, flow more easily. Viscosity is an important property in various scientific and industrial applications, including the study of fluid dynamics, lubrication, and the design of pipelines and pumps.
13.
Which scientific term means "curved inwards"?
Correct Answer
A. Concave
Explanation
Concave is the correct answer because it refers to a scientific term that means "curved inwards." In scientific terminology, concave is used to describe a surface or an object that has a curved shape with an inward curvature. This term is commonly used in fields such as physics and optics to describe the shape of lenses, mirrors, and other curved surfaces.
14.
Which scientific term is defined as a physical particle with a negative charge?
Correct Answer
A. Electron
Explanation
An electron is a scientific term that is defined as a physical particle with a negative charge. It is a fundamental subatomic particle that orbits around the nucleus of an atom. Electrons play a crucial role in determining the chemical and physical properties of matter and are involved in various processes such as electricity, magnetism, and chemical bonding.
15.
What is the term for the capacity of a body or system to do work?
Correct Answer
C. Energy
Explanation
Energy is the term used to describe the capacity of a body or system to do work. It is a fundamental concept in physics and refers to the ability to exert force or cause a change in the state or motion of an object. Energy can exist in various forms, such as kinetic energy (energy of motion), potential energy (stored energy), thermal energy (heat), and electrical energy. It is a fundamental quantity in understanding and explaining the behavior of physical systems.
16.
Which scientific term is best defined as "a measure of frequency"?
Correct Answer
C. Hertz (Hz)
Explanation
Hertz (Hz) is the correct answer because it is a scientific term that is defined as "a measure of frequency." Frequency refers to the number of cycles or oscillations of a wave that occur in a second. Hertz is commonly used to measure the frequency of electromagnetic waves, sound waves, and other types of waves. It is named after the German physicist Heinrich Hertz, who made significant contributions to the study of electromagnetism.