1.
What is the pulling force that the Earth exerts on every object near it?
Correct Answer
D. Gravity
Explanation
Gravity is the pulling force that the Earth exerts on every object near it. It is the force that attracts objects towards the center of the Earth. This force is responsible for keeping objects on the Earth's surface and giving weight to objects. Gravity is a fundamental force of nature and is responsible for the motion of celestial bodies, the tides, and many other phenomena.
2.
Which of these is a conditional energy?
Correct Answer
D. Potential Energy
Explanation
Potential energy is a type of energy that is associated with an object's position or state. It is stored energy that has the potential to be converted into other forms of energy, such as kinetic energy. Unlike dirty energy or swamp energy, which are not specific types of energy, potential energy is a well-defined concept in physics. Therefore, potential energy is the correct answer as it meets the criteria of being a conditional energy.
3.
What law describes resistances?
Correct Answer
D. Ohm's Law
Explanation
Ohm's Law describes the relationship between resistance, current, and voltage in an electrical circuit. It states that the current flowing through a conductor is directly proportional to the voltage applied across it and inversely proportional to the resistance of the conductor. This law is named after the German physicist Georg Simon Ohm, who first formulated it in 1827.
4.
What do electricians use to test circuits?
Correct Answer
A. Continuity Tester
Explanation
Electricians use a continuity tester to test circuits. This device is used to check if there is an uninterrupted path for the flow of electric current in a circuit. It helps to identify any breaks or faults in the circuit by indicating whether there is continuity or a break in the electrical connection. A ruler is not used for testing circuits, and a thermometer is used to measure temperature, not to test circuits. Circus peanuts have no relevance to testing circuits.
5.
What circuit is put on a piece of chemically bathed plastic?
Correct Answer
C. Printed Circuit
Explanation
A printed circuit is a circuit that is created by printing conductive material onto a piece of chemically bathed plastic. This allows for the creation of a compact and efficient circuit that can be easily mass-produced. Plasticizers are substances added to plastic to increase its flexibility, but they are not circuits themselves. Artificial circuits and ringed circuits are not commonly used terms in the context of circuitry.
6.
What are circuits that have only one path for electricity to flow?
Correct Answer
A. Series Circuits
Explanation
Series circuits are circuits that have only one path for electricity to flow. In a series circuit, the components are connected end to end, forming a single loop. This means that the current flowing through each component is the same. If one component in a series circuit fails or is removed, the entire circuit is broken and no current can flow. Therefore, series circuits are characterized by having a single path for electricity to flow.
7.
What is an area where atomic magnets point in the same direction called?
Correct Answer
B. Domain
Explanation
A domain is an area where atomic magnets point in the same direction. In a material, the arrangement of atomic magnets determines its magnetic properties. When the atomic magnets align and point in the same direction within a specific region, it forms a domain. Domains are important in understanding how magnetic materials behave and interact with magnetic fields.
8.
What measurement is defined as using one kilowatt in one hour?
Correct Answer
D. Kilowatt-Hour
Explanation
A kilowatt-hour is the correct measurement for using one kilowatt in one hour. It is a unit of energy equal to the amount of energy used by a one-kilowatt device in one hour. This measurement is commonly used to determine electricity consumption and billing.
9.
Who defined the radius of a black hole?
Correct Answer
B. Schwartzchild
Explanation
Schwartzchild is the correct answer because he was the first to provide a mathematical solution to Einstein's field equations that described the geometry of a black hole. This solution, known as the Schwartzchild metric, includes a parameter called the Schwartzchild radius, which defines the size of the event horizon of a black hole. Therefore, Schwartzchild defined the radius of a black hole through his metric.
10.
Which of the following is NOT true of static magnetic fields?
Correct Answer
A. They Are SpHerically Symmetric
Explanation
Static magnetic fields are not spherically symmetric. Spherical symmetry means that the field has the same strength and direction at all points on a sphere centered on the source of the field. However, static magnetic fields have a specific direction and strength that can vary at different points in space, depending on the source of the field. Therefore, they do not exhibit spherical symmetry.
11.
Paul Dirac, in his relativistic treatment of quantum mechanics, predicted what elementary particle later observed by Carl Anderson?
Correct Answer
A. Positrons
Explanation
In his relativistic treatment of quantum mechanics, Paul Dirac predicted the existence of a new elementary particle. This particle, later observed by Carl Anderson, is known as a positron. Positrons are the antiparticles of electrons, carrying a positive charge instead of a negative charge. Dirac's prediction of the positron was a significant contribution to the field of particle physics and provided further evidence for the existence of antimatter.
12.
How many quarks make up a proton?
Correct Answer
D. Three
Explanation
A proton is made up of three quarks. Quarks are elementary particles that are the building blocks of protons and neutrons. Protons consist of two up quarks and one down quark, which gives them a positive charge. The combination of these three quarks creates the overall structure and properties of a proton.
13.
Why does your voice sounds higher after you breathe helium?
Correct Answer
D. The Speed And Density Of Helium Compared To Air
Explanation
Helium has a lower density and higher speed of sound compared to air. When we inhale helium, it replaces the air in our vocal tract. The lower density of helium causes the sound waves to travel faster, resulting in a higher pitch when they reach our ears. This change in the speed and density of the medium through which the sound waves propagate leads to the auditory illusion of a higher voice.
14.
Which is not true of concave lenses?
Correct Answer
D. They're Useful As Magnifying Lenses
Explanation
Concave lenses are used to correct near-sightedness, so the statement "They're Used To Correct Near-Sightedness" is true. The focal length of a concave lens is defined to be negative, which means that the lens diverges light rays. This is also true. Concave lenses only produce virtual images, as the light rays appear to diverge from a virtual focal point. Lastly, concave lenses are not useful as magnifying lenses, as they cause objects to appear smaller. Therefore, the statement "They're Useful As Magnifying Lenses" is not true.
15.
Albert Einstein received the 1921 Nobel Prize for formulating the theory that explained what phenomenon?
Correct Answer
D. pHotoelectric Effect
Explanation
Albert Einstein received the 1921 Nobel Prize for formulating the theory of the photoelectric effect. This theory explained the phenomenon of how light can eject electrons from a material's surface. Einstein's work on the photoelectric effect provided strong evidence for the particle-like behavior of light and laid the foundation for the development of quantum mechanics.