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Quizzes Created: 2 | Total Attempts: 109,193
Questions: 20 | Viewed: 94,552


The layer of gas covering the earth is called:

Answer: Atmosphere
The atmosphere is the name for the layer of gases that surrounds the Earth. It is made up of several gases, including oxygen and nitrogen, which are essential for life on our planet. This layer protects us from the harmful rays of the sun and helps keep the Earth's temperature stable. Unlike the hydrosphere, which includes all water on Earth, and the lithosphere, which is the Earth's solid outer layer, the atmosphere is all about the gases that make up the air we breathe. The troposphere is just one part of the atmosphere where weather happens.

The speed of light has been calculated to be 186,000.

Answer: Miles per second
The speed of light is incredibly fast, measured at about 186,000 miles per second. This speed is a fundamental constant in physics, known as "c," and it means that light can travel from the Earth to the Moon in just over a second! Light's speed is the same in a vacuum and doesn't change, making it a crucial part of many scientific theories and calculations, such as Einstein's theory of relativity. This speed isn't just for light but also applies to all electromagnetic radiation, including radio waves, microwaves, and X-rays.

A distance of one mile is about:

Answer: 1.6 kilometers
One mile is approximately 1.6 kilometers. This conversion is useful for understanding distances when traveling between places that use different measurement systems. In countries that use the metric system, kilometers are the standard unit of distance, while miles are commonly used in the United States and a few other countries. Knowing that one mile is about 1.6 kilometers helps with quick conversions and better understanding of distances, whether you're running a race, driving, or planning a trip in different parts of the world.

The largest object in the solar system is:

Answer: A star
The largest object in our solar system is the Sun, which is a star. It makes up about 99.86% of the solar system's total mass. The Sun is so massive that its gravity holds all the planets, asteroids, comets, and other objects in orbit around it. Stars like the Sun are huge balls of gases, primarily hydrogen and helium, undergoing nuclear fusion to produce light and heat. This energy is essential for life on Earth and influences the climate and conditions on all other planets in our solar system.

When a scientist uses the process of reasoning, it means that he 

Answer: Makes inferences on the basis of observations
When a scientist uses the process of reasoning, it means that he makes inferences on the basis of observations. This means that the scientist uses logical thinking and analysis to draw conclusions from the data and evidence gathered through observations. Reasoning allows scientists to make connections, identify patterns, and make educated guesses or predictions based on the information they have collected. It is an essential step in the scientific method and helps scientists to understand and explain the natural world.

An instrument that is used to map the ocean floor is called?

Answer: A SONAR
A SONAR (Sound Navigation and Ranging) is the instrument used to map the ocean floor. It works by emitting sound waves underwater and measuring how long it takes for the echoes to return after bouncing off the seabed or other underwater features. This data helps create detailed maps of the ocean floor, revealing its various landscapes—like mountains, valleys, and trenches. SONAR technology is crucial for navigation, underwater exploration, and scientific research, helping to understand marine environments better. The other instruments listed serve different purposes related to water but are not specifically used for mapping the ocean floor.

When scientists refer to the hydrosphere, they mean:

Answer: Water of the earth
The hydrosphere refers to all the water on Earth, including oceans, lakes, rivers, groundwater, and even water vapor in the atmosphere. It is an essential component of Earth's system and plays a crucial role in various processes such as weather, climate, and the water cycle. Therefore, when scientists refer to the hydrosphere, they are specifically referring to the water present on Earth.

Chemical elements that are usually present in only very small amounts are called?

Answer: Trace elements
 Chemical elements that are typically found in very small amounts are known as "trace elements." These elements, despite their minimal presence, are crucial for various biological and chemical processes. For example, in living organisms, trace elements like iron, zinc, and copper are vital for health but are needed only in tiny quantities. Similarly, in environmental science, trace elements can refer to minor but important components of soils and rocks. Understanding trace elements helps in studying nutrient deficiencies and pollution levels.

The Milky Way is a 

Answer: Galaxy
 The Milky Way is classified as a galaxy. A galaxy is a massive, gravitationally bound system that contains stars, stellar remnants, gas, dust, and dark matter. The Milky Way specifically is a barred spiral galaxy, which means it has a central bar-shaped structure made of stars and spiral arms that emanate from this bar. It's our home galaxy, containing our Solar System and billions of other stars, with their own planets. Galaxies like the Milky Way are fundamental components of the universe, helping astronomers understand the large-scale structure of the cosmos.

The brightest star in the sky other than our sun is:

Answer: Sirius
Sirius, also known as the Dog Star, is the brightest star in the night sky when viewed from Earth, other than our Sun. It's located in the constellation Canis Major and is a part of what astronomers call a binary star system, which includes a main sequence star, Sirius A, and a fainter white dwarf, Sirius B. The brightness of Sirius is due to its luminosity and its relatively close proximity to Earth. It's a very important star for astronomical studies and has been significant in various cultures' folklore and mythology.

A scale of temperature that uses absolute zero, the lowest possible temperature for its zero points is called 

Answer: Kelvin scale
The Kelvin scale is a temperature scale that uses absolute zero as its zero point. Absolute zero, defined as 0 Kelvin, represents the lowest possible temperature, where the motion of atoms theoretically stops. The Kelvin scale is crucial in the fields of science and engineering because it provides a precise measure of thermal energy. Temperatures on this scale are written as "Kelvin" or "K" (not degrees Kelvin). This scale is particularly useful in scientific experiments where temperature differences and absolute temperatures need to be accurately measured and compared.

The force of attraction between the earth and the moon is called 

Answer: Gravity
Gravity is the force of attraction between two objects with mass. In this case, it refers to the force of attraction between the Earth and the Moon. This force is responsible for keeping the Moon in orbit around the Earth and is also responsible for tides on Earth. Inertia refers to an object's resistance to change in motion, relativity is a theory of physics, and equivalence is a concept in mathematics. None of these options accurately describe the force of attraction between the Earth and the Moon.

The moon’s gravity is _____________ that of the earth’s.

Answer: 1/6
The moon's gravity is about one-sixth (1/6) that of Earth's. This means that if you weigh 120 pounds on Earth, you would weigh only about 20 pounds on the moon. The moon's weaker gravity is due to its smaller mass compared to Earth. This significant difference in gravitational strength affects everything from the moon's ability to retain an atmosphere to the height and duration of leaps or jumps one could make if standing on the lunar surface. Understanding this helps in planning missions and activities for astronauts visiting the moon.

Which of the following did Sir Isaac Newton discover?

Answer: Law of gravitation
Sir Isaac Newton discovered the law of gravitation. This law states that every object in the universe attracts every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Newton's discovery of this law revolutionized our understanding of the physical world and laid the foundation for modern physics.

Why is it warmer in regions near the equator?

Answer: Regions near the equator get vertical rays from the sun.
Regions near the equator are warmer primarily because they receive sunlight more directly compared to other parts of the world. The sun's rays hit the equator at a near-vertical angle, meaning they are less spread out and more concentrated in energy. This direct exposure results in higher temperatures. The closer proximity to the sun in terms of angle, not distance, is the key factor. This geographical characteristic leads to warmer climates, dense rainforests, and diverse ecosystems around the equatorial belt.

What is the important animal hormone responsible for the control of glucose levels in the blood?

Answer: Insulin
Insulin is the important animal hormone responsible for the control of glucose levels in the blood. It is produced by the pancreas and helps regulate the amount of glucose in the bloodstream. Insulin allows cells to absorb glucose and use it for energy, thus lowering blood sugar levels. Without sufficient insulin, glucose levels can become too high, leading to conditions like diabetes. Thyroxine, cortisol, and prostaglandin are not directly involved in the control of glucose levels in the blood.

A 1,000-kilogram car traveling with a velocity of +20. meters per second decelerates uniformly at -5.0 meters per second2 until it comes to rest.  What is the total distance the car travels as it decelerates to rest?

Answer: 40 m
To find the total distance the car travels as it decelerates to rest, we use the kinematic equation that relates initial velocity, acceleration, and distance traveled: v_f^2 = v_i^2 + 2a * d




v_f is the final velocity (0 m/s, since the car comes to rest),

v_i is the initial velocity (20 m/s),

a is the acceleration (-5.0 m/s^2, because it is deceleration),

d is the distance.

Setting up the equation with these values:

0 = 20^2 + 2 * (-5) * d

0 = 400 - 10d


Solving for d:

10d = 400


d = 40 meters.

Therefore, the car travels a total distance of 40 meters as it decelerates to rest.

What yellowish-orange compound belonging to the vitamin B complex is used to treat pernicious anemia? It is synthesized in the intestinal bacteria and occurs in green plants, fresh fruit, liver, and yeast.  Its formula is C19H19N7O6.

Answer: Folic acid
The yellowish-orange compound belonging to the vitamin B complex that is used to treat pernicious anemia and has the formula C19H19N7O6 is folic acid. Folic acid, also known as folate when found in foods, is crucial for the production and maintenance of new cells, especially during periods of rapid growth such as pregnancy and infancy. It is synthesized by intestinal bacteria and is also found naturally in green plants, fresh fruit, liver, and yeast. Folic acid plays a key role in preventing birth defects and is essential for overall health.

The reaction 2H2O(l) --> 2H2O(g) + O2(g) is forced to occur by use of an externally applied electric current. This procedure is called  

Answer: Electrolysis
 The reaction described, 2H2O(l) --> 2H2O(g) + O2(g), involves splitting water into hydrogen gas and oxygen gas using an externally applied electric current. This process is known as electrolysis. Electrolysis is a method used to drive a chemical reaction that would not otherwise occur on its own by applying electrical energy. In the context of water, electrolysis breaks the bonds between hydrogen and oxygen atoms in water molecules, resulting in the formation of hydrogen gas and oxygen gas. This technique is important in various industrial processes and for producing gases for fuel and other uses.

A student calculated the percent by mass of water in a sample of BaCl2 * H2O to be 16.4% but the accepted value is 14.8%.  What was the student’s percent error?

Answer: (1.6/14.8)*100%
To calculate the student’s percent error in determining the percent by mass of water in a sample of BaCl2 * H2O, we first need to determine the absolute error, which is the difference between the experimental value (16.4%) and the accepted value (14.8%). The absolute error is:16.4% - 14.8% = 1.6%Next, the percent error is calculated by dividing the absolute error by the accepted value and then multiplying by 100 to convert it into a percentage. This is expressed as:(1.6 / 14.8) * 100%Thus, the student's percent error in this calculation is:(1.6 / 14.8) * 100% = 10.81%This result indicates how much the student's measurement deviated from the accepted value in percentage terms.
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