Science 8 Semester 1 Final
(70).webp "Science 8 Semester 1 Final - Quiz")
Questions and Answers
- 1.
Knowledge gained by observing the natural world is _____.
- A.
Not part of physical science
- B.
A theory
- C.
Science
Correct Answer
C. ScienceExplanation
Observing the natural world and gaining knowledge from it is considered science. Science involves the systematic study of the natural world through observation, experimentation, and analysis. It encompasses various disciplines such as biology, chemistry, physics, and more. By observing the natural world, scientists can gather data and formulate theories and hypotheses to explain phenomena and make predictions. Therefore, the statement "knowledge gained by observing the natural world is science" is a valid explanation.Rate this question:
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- 2.
The first step in the Scientific Method is to _________.
- A.
Test your hypothesis
- B.
Create a hypothesis
- C.
Make an observation
- D.
Ask a question
Correct Answer
C. Make an observationExplanation
The first step in the Scientific Method is to make an observation. This involves gathering information or data about a particular phenomenon or problem. By making an observation, scientists can identify patterns, trends, or anomalies that can lead to the formulation of a hypothesis. It is through careful observation that scientists can begin to ask questions and develop a hypothesis to test. Therefore, making an observation is the initial step in the Scientific Method.Rate this question:
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- 3.
A hypothesis is _________.
- A.
All of the choices
- B.
Created before you can perform an experiment
- C.
A very important part of the Scientific Method
- D.
An educated guess
Correct Answer
A. All of the choicesExplanation
A hypothesis is a statement or explanation that is created before conducting an experiment, and it is an essential component of the Scientific Method. It is an educated guess that is based on previous knowledge or observations. Therefore, the correct answer is that a hypothesis encompasses all of the given choices.Rate this question:
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- 4.
Scientists often use these types of calculations to help them determine what kind of substance they are dealing with.
- A.
Density
- B.
Volume
- C.
Weight
- D.
Mass
Correct Answer
A. DensityExplanation
Density is a measure of how much mass is contained in a given volume of a substance. It is calculated by dividing the mass of the substance by its volume. Scientists use density calculations to identify substances because different substances have different densities. By comparing the density of an unknown substance to the densities of known substances, scientists can determine what kind of substance they are dealing with.Rate this question:
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- 5.
Which of the following actions would involve both physical and chemical properties?
- A.
Building a bridge that does not rust
- B.
Removing a stain from a piece of clothing
- C.
Chopping up vegetables
- D.
Choosing clothing based on weather
Correct Answer
A. Building a bridge that does not rustExplanation
Building a bridge that does not rust involves both physical and chemical properties. The physical property involved is the structure and design of the bridge, ensuring it is built with materials that are resistant to rust. The chemical property involved is the use of anti-corrosion coatings or alloys that prevent the bridge from reacting with oxygen and water, which are the main causes of rust formation. Therefore, this action requires an understanding of both the physical and chemical properties of materials to achieve the desired outcome.Rate this question:
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- 6.
A characteristic of a substance that can be observed without changing the substance is called a(n) _______.
- A.
Physical property
- B.
Constant property
- C.
Essential property
- D.
Chemical property
Correct Answer
A. Physical propertyExplanation
A physical property is a characteristic of a substance that can be observed or measured without changing the substance itself. It refers to properties such as color, shape, size, density, melting point, boiling point, and conductivity. These properties can be determined through simple observation or by conducting experiments. Unlike chemical properties, physical properties do not involve any chemical reactions or changes in the composition of the substance. Therefore, a physical property can be observed and measured without altering the substance in any way.Rate this question:
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- 7.
What is a measure of the gravitational force on an object called?
- A.
Mass
- B.
Weight
- C.
Volume
- D.
Matter
Correct Answer
B. WeightExplanation
Weight is a measure of the gravitational force on an object. It is the force with which an object is pulled towards the center of the Earth or any other celestial body. Weight is dependent on the mass of the object as well as the strength of the gravitational field it is in. Mass, on the other hand, is a measure of the amount of matter in an object and is constant regardless of the location. Therefore, weight is the correct answer as it specifically refers to the gravitational force on an object.Rate this question:
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- 8.
A scientist immerses an irregularly shaped object into a beaker of water and notes how far the water rises. What property of the object is the scientist measuring?
- A.
Mass
- B.
Density
- C.
Weight
- D.
Volume
Correct Answer
D. VolumeExplanation
The scientist is measuring the volume of the irregularly shaped object. Volume refers to the amount of space occupied by an object, and in this case, it is determined by measuring the displacement of water when the object is immersed in it. The other options, mass, density, and weight, are not directly related to the measurement being performed in this scenario.Rate this question:
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- 9.
When a candle is lit, the wick burns and the wax melts. These are examples of ________.
- A.
Only chemical properties
- B.
Neither chemical nor physical properties
- C.
Only physical properties
- D.
Both chemical and physical properties
Correct Answer
D. Both chemical and physical propertiesExplanation
When a candle is lit, the wick burning is a chemical property because it involves a chemical reaction between the fuel (wick) and the oxygen in the air, resulting in the release of heat and light. On the other hand, the wax melting is a physical property because it does not involve a chemical reaction, but rather a change in the state of matter from solid to liquid due to the application of heat. Therefore, both the burning of the wick and the melting of the wax demonstrate both chemical and physical properties.Rate this question:
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- 10.
The force that causes some liquids to form round drops is _______.
- A.
Surface tension
- B.
Melting
- C.
Boiling
- D.
Viscosity
Correct Answer
A. Surface tensionExplanation
Surface tension is the force that causes some liquids to form round drops. Surface tension is a property of liquids that arises due to the cohesive forces between the molecules at the surface. These cohesive forces create a "skin" or "film" on the surface of the liquid, causing it to minimize its surface area and form spherical droplets. This phenomenon is commonly observed in water droplets on a surface or in the formation of soap bubbles. Melting, boiling, and viscosity are not directly related to the formation of round drops in liquids.Rate this question:
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- 11.
When a chemical reaction between oxygen gas and hydrogen gas occurs _______.
- A.
Oxygen atoms are lost
- B.
Atoms in both substances are rearranged
- C.
No chemical changes takes place
- D.
No physical change takes place
Correct Answer
B. Atoms in both substances are rearrangedExplanation
In a chemical reaction between oxygen gas and hydrogen gas, the atoms in both substances are rearranged. This means that the individual atoms of oxygen and hydrogen combine to form new molecules, in this case, water (H2O). The reaction involves the breaking of bonds between oxygen atoms and hydrogen atoms and the formation of new bonds between oxygen and hydrogen atoms to create water molecules. Therefore, the answer choice "atoms in both substances are rearranged" accurately describes the process that occurs during this chemical reaction.Rate this question:
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- 12.
When silica in the form of sand is melted into glass _______.
- A.
A chemical reaction occurs
- B.
No physical change takes place
- C.
No new substances are formed
- D.
A new substance is formed
Correct Answer
C. No new substances are formedExplanation
When silica in the form of sand is melted into glass, no new substances are formed. This is because the process of melting sand to form glass is a physical change rather than a chemical reaction. The silica molecules in the sand rearrange themselves when heated, but they do not undergo a chemical reaction to form any new substances. Instead, they simply change their physical state from solid to liquid, and then cool and solidify to form glass.Rate this question:
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- 13.
The state of matter with a fixed shape and volume is a _____.
- A.
Particle
- B.
Gas
- C.
Liquid
- D.
Solid
Correct Answer
D. SolidExplanation
A solid is a state of matter that has a fixed shape and volume. In a solid, the particles are tightly packed together and have very little freedom to move. This results in a rigid structure that maintains its shape and volume. Unlike liquids and gases, solids do not flow or take the shape of their container. Instead, they maintain a specific geometric shape and their particles vibrate in place. Examples of solids include ice, wood, and metal.Rate this question:
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- 14.
Ammonia is a liquid at room temperature. Which of the following statements about the particles in the liquid is true?
- A.
They have no attraction toward one another.
- B.
They have a weak attraction toward one another.
- C.
They are tightly bound together.
- D.
They have a rigid structure.
Correct Answer
B. They have a weak attraction toward one another.Explanation
The correct answer is "They have a weak attraction toward one another." This is because in a liquid state, the particles are close together but still have enough energy to move around and slide past each other. The weak attraction between the particles allows them to stay close together but not in a rigid structure like a solid.Rate this question:
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- 15.
When a liquid freezes, the particles _______.
- A.
Break away from each other
- B.
Move faster
- C.
Slow down but still move in place
- D.
Stop moving
Correct Answer
C. Slow down but still move in placeExplanation
When a liquid freezes, the particles slow down but still move in place. Freezing is the process in which a liquid changes into a solid state due to the decrease in temperature. As the temperature decreases, the kinetic energy of the particles decreases, causing them to slow down. However, the particles still maintain their positions and continue to vibrate in place, forming a rigid structure characteristic of a solid. Therefore, the correct answer is that the particles slow down but still move in place.Rate this question:
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- 16.
Having a low viscosity means _______.
- A.
The liquid forms very round drops
- B.
The liquid forms very flat drops
- C.
The liquid moves very slowly
- D.
The liquid moves very quickly
Correct Answer
D. The liquid moves very quicklyExplanation
Having a low viscosity means that the liquid moves very quickly. Viscosity refers to the resistance of a fluid to flow. A low viscosity indicates that the fluid has a low resistance to flow, allowing it to move easily and quickly. This is because the intermolecular forces within the liquid are weak, allowing the molecules to move past each other with little resistance. As a result, the liquid flows rapidly, without much hindrance or sluggishness.Rate this question:
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- 17.
Having low surface tension means _______.
- A.
The liquid forms very round drops
- B.
The liquid forms very flat drops
- C.
The liquid moves very slowly
- D.
The liquid moves very quickly
Correct Answer
B. The liquid forms very flat dropsExplanation
When a liquid has low surface tension, it means that the molecules at the surface of the liquid are not strongly attracted to each other. As a result, the liquid does not form cohesive spherical droplets, but instead spreads out and forms flat drops. This is because the weak forces between the molecules cannot hold the droplet shape together, causing it to spread out and flatten.Rate this question:
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- 18.
When elements form mixtures, the elements ________.
- A.
Combine in a specific mass ratio
- B.
React to form a new substance with new properties
- C.
Always change their physical state
- D.
Keep their original properties
Correct Answer
D. Keep their original propertiesExplanation
When elements form mixtures, they keep their original properties. This means that the individual elements in the mixture retain their own characteristics and do not undergo any chemical reactions or transformations. They may physically mix together, but they do not combine in a specific mass ratio or react to form a new substance with new properties. Therefore, the correct answer is that the elements keep their original properties when forming mixtures.Rate this question:
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- 19.
How could a sugar cube be dissolved more quickly in water?
- A.
Add more water.
- B.
Crush the sugar cube.
- C.
Cool the water.
- D.
Let the cube sit in the water.
Correct Answer
B. Crush the sugar cube.Explanation
Crushing the sugar cube increases its surface area, allowing more water molecules to come into contact with the sugar. This increases the rate of dissolution, as more sugar molecules can be surrounded and pulled away from the solid cube by the water molecules. Adding more water would dilute the solution, but not necessarily dissolve the sugar faster. Cooling the water might slow down the dissolution process, as colder water molecules move slower. Letting the cube sit in the water would eventually dissolve the sugar, but it would take more time compared to crushing the cube.Rate this question:
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- 20.
What is an object that appears to stay in place and that helps you detect motion in another object?
- A.
An increase in velocity
- B.
A black whole
- C.
A reference point
- D.
A Newton
Correct Answer
C. A reference pointExplanation
A reference point is an object that appears to stay in place and helps detect motion in another object. It is a fixed location or object that is used as a comparison to determine if another object is moving or not. By observing the relative position of the other object in relation to the reference point, one can detect any motion or changes in position.Rate this question:
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- 21.
To calculate an object’s average acceleration, you need to know ________.
- A.
Average speed, distance, and the time it takes to change velocity
- B.
Starting velocity, final velocity, and time it takes to change velocity
- C.
Starting point, endpoint, and the object’s mass
- D.
Starting velocity, distance traveled, and speed
Correct Answer
B. Starting velocity, final velocity, and time it takes to change velocityExplanation
To calculate an object's average acceleration, you need to know the starting velocity, final velocity, and the time it takes to change velocity. This is because acceleration is the rate at which velocity changes over time. By knowing the starting and final velocities, as well as the time it takes for the change to occur, one can calculate the average acceleration using the formula: average acceleration = (final velocity - starting velocity) / time.Rate this question:
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- 22.
The gravitational pull is greater between two objects that ________.
- A.
Are moving at greater speed
- B.
Are farther apart
- C.
Have rougher surfaces
- D.
Have greater masses
Correct Answer
D. Have greater massesExplanation
The gravitational pull between two objects is determined by their masses. The greater the mass of an object, the stronger its gravitational pull. Therefore, when two objects have greater masses, the gravitational pull between them will be greater.Rate this question:
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- 23.
What is the net force on an object when you combine a force of 10 N north with a force of 5 N south?
- A.
5 N north
- B.
50 N north
- C.
15 N north
- D.
5 N south
Correct Answer
A. 5 N northExplanation
When you combine a force of 10 N north with a force of 5 N south, the net force can be calculated by subtracting the smaller force from the larger force. In this case, 10 N - 5 N = 5 N. The direction of the net force is determined by the larger force, which is north in this case. Therefore, the net force on the object is 5 N north.Rate this question:
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- 24.
The difference between speed and velocity is that _________.
- A.
Speed has direction, while velocity does not
- B.
Velocity has direction, while speed does not
- C.
Speed involves time, while velocity does not
- D.
Velocity involves time, while speed does not
Correct Answer
B. Velocity has direction, while speed does notExplanation
The difference between speed and velocity is that velocity has direction, while speed does not. Speed is a scalar quantity that represents how fast an object is moving, while velocity is a vector quantity that not only represents the magnitude of the speed but also the direction in which the object is moving. In other words, speed only considers the magnitude of the motion, while velocity takes into account both magnitude and direction.Rate this question:
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- 25.
To produce change in motion, a force must be a(n) ________.
- A.
Gravitational force
- B.
Frictional force
- C.
Unbalanced force
- D.
Balanced force
Correct Answer
C. Unbalanced forceExplanation
An unbalanced force is necessary to produce a change in motion. When there is an unbalanced force acting on an object, it causes the object to accelerate or decelerate, resulting in a change in its motion. In contrast, a balanced force does not cause a change in motion as the forces acting on the object cancel each other out. Therefore, in order for an object to experience a change in motion, an unbalanced force is required.Rate this question:
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- 26.
When a semi truck drives down the freeway on his huge tires, which type of friction is the truck using to make the drive easier?
- A.
gravitational friction
- B.
Rolling kinetic friction
- C.
Sliding kinetic friction
- D.
Static friction
Correct Answer
B. Rolling kinetic frictionExplanation
The correct answer is rolling kinetic friction. When a semi truck drives down the freeway on its huge tires, it relies on rolling kinetic friction to make the drive easier. Rolling kinetic friction occurs when an object rolls over a surface, and it is generally lower than sliding kinetic friction, which would make it easier for the truck to move forward. Gravitational friction is not a recognized type of friction, and static friction would come into play if the truck was at rest and needed to be set in motion.Rate this question:
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- 27.
A car is traveling down the road at 25 m/s, and then increases their speed to 45 m/s in 5 seconds. What is this car's acceleration?
- A.
5 m/s/s
- B.
4 m/s/s
- C.
3 m/s/s
- D.
2 m/s/s
Correct Answer
B. 4 m/s/sExplanation
The car's initial speed is 25 m/s and its final speed is 45 m/s. The change in speed is 45 m/s - 25 m/s = 20 m/s. The time taken for this change in speed is 5 seconds. Acceleration is defined as the change in velocity divided by the time taken. Therefore, the acceleration of the car is 20 m/s divided by 5 seconds, which equals 4 m/s/s.Rate this question:
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- 28.
A tennis ball is lying still on the tennis court and is not moving due to static friction keeping the ball in place. As soon as it is hit, what happens to the static friction?
- A.
It is converted into kinetic friction.
- B.
It increases due to the movement of the ball.
- C.
It completely disappears and is converted into energy.
- D.
It is still there and has not changed.
Correct Answer
A. It is converted into kinetic friction.Explanation
When the tennis ball is hit, the static friction that was keeping it in place is converted into kinetic friction. Kinetic friction occurs when two surfaces are in relative motion. As the ball starts moving, the static friction is overcome and converted into kinetic friction, which opposes the motion of the ball. This change in friction allows the ball to roll or slide on the tennis court.Rate this question:
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- 29.
Which of the following will increase the acceleration of an object that is pushed by a force?
- A.
Increasing the gravity of the object
- B.
Increasing the mass of the object
- C.
Increasing the force pushing the object
- D.
Decrease the force pushing the object
Correct Answer
C. Increasing the force pushing the objectExplanation
Increasing the force pushing the object will increase the acceleration of the object. According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it. Therefore, by increasing the force pushing the object, the net force acting on it will also increase, resulting in a greater acceleration.Rate this question:
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- 30.
Newton's second law ______.
- A.
None of the above
- B.
Describes that all objects resist motion
- C.
States that forces occur in pairs
- D.
Describes how acceleration, mass, and force are all related
Correct Answer
D. Describes how acceleration, mass, and force are all relatedExplanation
Newton's second law of motion states that the acceleration of an object is directly proportional to the net force applied to it and inversely proportional to its mass. In other words, it describes the relationship between acceleration, mass, and force. This law helps us understand how objects move and how the application of force affects their motion.Rate this question:
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- 31.
Which of the following has the smallest amount of momentum?
- A.
A jet airplane being towed toward an airport
- B.
A track athlete running a race
- C.
A loaded truck driven at high-way speeds
- D.
A baby crawling on the floor
Correct Answer
D. A baby crawling on the floorExplanation
The momentum of an object is directly proportional to its mass and velocity. In this case, the baby crawling on the floor has the smallest amount of momentum because it has a very small mass and a very low velocity compared to the other options. The jet airplane being towed, the track athlete running, and the loaded truck driven at high-way speeds all have significantly larger masses and velocities, resulting in greater momentum.Rate this question:
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- 32.
The momentum of a 3.0 kg puppy that is running with a velocity of 5.0 m/s south is _______.
- A.
15 kg*m/s
- B.
8 kg*m/s south
- C.
2 kg*m/s
- D.
15 kg*m/s south
Correct Answer
D. 15 kg*m/s southExplanation
The momentum of an object is calculated by multiplying its mass and velocity. In this case, the mass of the puppy is given as 3.0 kg and its velocity is given as 5.0 m/s south. Multiplying these values gives us a momentum of 15 kg*m/s. The direction of the momentum is south, as indicated by the given velocity. Therefore, the correct answer is 15 kg*m/s south.Rate this question:
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- 33.
The SI unit for length is the _____.
- A.
Meter
- B.
Liter
- C.
Foot
- D.
Inch
Correct Answer
A. MeterExplanation
The SI unit for length is the meter. The meter is the internationally recognized unit of measurement for length in the metric system. It is defined as the distance that light travels in a vacuum in 1/299,792,458 of a second. Other units such as liter, foot, and inch are not part of the SI system and are used in different contexts or measurement systems.Rate this question:
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- 34.
The SI unit for volume is the _____.
- A.
Gallon
- B.
Quart
- C.
Cup
- D.
Liter
Correct Answer
D. LiterExplanation
The SI unit for volume is the liter. The liter is a metric unit of volume that is commonly used in scientific and everyday measurements. It is equivalent to 1000 milliliters or 1 cubic decimeter. The liter is widely accepted and used internationally as the standard unit for measuring volume in the metric system.Rate this question:
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- 35.
A duck heading south flies 100 meters in 10 second. What is its velocity?
- A.
10 m/s
- B.
10 m/s south
- C.
1000 m/s
- D.
10000 m/s
Correct Answer
B. 10 m/s southExplanation
The velocity of the duck is 10 m/s south because velocity is a vector quantity that includes both magnitude (speed) and direction. In this case, the duck is flying south, so the direction is specified. The magnitude of the velocity is given as 10 m/s, indicating the speed at which the duck is flying.Rate this question:
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- 36.
What is an example of a phase change from a liquid to gas?
- A.
Vaporization
- B.
Melitng
- C.
Freezing
- D.
Sublimation
Correct Answer
A. VaporizationExplanation
Vaporization is the process in which a liquid changes into a gas. This phase change occurs when the temperature of the substance is increased to its boiling point, causing the molecules to gain enough energy to overcome the intermolecular forces holding them together. As a result, the liquid molecules escape from the surface and enter the gas phase. This phase change is commonly observed when water boils and turns into steam.Rate this question:
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- 37.
Pieces of information gathered by scientists to test hypotheses are called data.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Scientists gather pieces of information to test their hypotheses, and this information is called data. Data can be collected through various methods such as experiments, observations, surveys, or simulations. It provides evidence and support for or against a hypothesis, allowing scientists to draw conclusions and make informed decisions. Therefore, the statement "Pieces of information gathered by scientists to test hypotheses are called data" is true.Rate this question:
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- 38.
Everything is made up of matter.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement is true because matter is defined as anything that has mass and takes up space. Everything around us, including objects, substances, and even energy, is made up of matter. Therefore, it is correct to say that everything is made up of matter.Rate this question:
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- 39.
When heat is removed from a substance, the particles start moving faster.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
When heat is removed from a substance, the particles actually slow down rather than moving faster. Heat is a form of energy that causes the particles in a substance to move and vibrate. When heat is taken away, the energy decreases, causing the particles to lose energy and slow down. This is why substances cool down when heat is removed from them. Therefore, the statement that the particles start moving faster when heat is removed is incorrect.Rate this question:
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- 40.
A blue liquid changing to green when another liquid is added is evidence of a chemical change.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When a blue liquid changes to green after adding another liquid, it indicates a chemical change. This is because a chemical change involves the formation of new substances with different properties. In this case, the change in color suggests that a chemical reaction has occurred, resulting in the formation of a new compound with a different color. This change in color cannot be reversed by simply removing the added liquid, further supporting the idea that it is a chemical change.Rate this question:
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- 41.
Newton's first law is sometimes called the Law of Inertia.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Newton's first law states that an object at rest will remain at rest, and an object in motion will continue moving at a constant velocity, unless acted upon by an external force. This law is often referred to as the Law of Inertia because it describes the tendency of objects to resist changes in their motion. Inertia is the property of matter that causes it to resist any change in its state of motion. Therefore, it is correct to say that Newton's first law is sometimes called the Law of Inertia.Rate this question:
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- 42.
When you sit in a chair, you are exerting a force downward into the chair. The chair is also pushing against you in the opposite direction.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When you sit in a chair, the force of gravity pulls you downward, causing you to exert a force onto the chair. According to Newton's third law of motion, for every action, there is an equal and opposite reaction. Therefore, the chair pushes back against you with an equal force in the opposite direction. This is why you can feel the chair supporting your weight when you sit on it. Hence, the statement is true.Rate this question:
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- 43.
If you drop an elephant and a penny off the top of the Empire State Building, the elephant will accelerate faster because it is heavier.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because the acceleration due to gravity is the same for all objects regardless of their mass. In a vacuum, both the elephant and the penny would experience the same acceleration, which is approximately 9.8 meters per second squared. However, due to air resistance, the penny would experience more resistance and reach its terminal velocity faster compared to the elephant.Rate this question:
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- 44.
A car and a train are traveling with the same velocity. Therefore, they have the same momentum.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because momentum is not solely determined by velocity. Momentum is the product of an object's mass and velocity. Therefore, even if the car and the train are traveling with the same velocity, their masses are likely to be different, resulting in different momenta.Rate this question:
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- 45.
The Law of Conservation of Momentum states that momentum is transferred between objects.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
The Law of Conservation of Momentum states that momentum is transferred between objects. This means that when two objects interact, the total momentum before the interaction is equal to the total momentum after the interaction. This principle is based on the fact that momentum is a conserved quantity in a closed system, meaning it cannot be created or destroyed, only transferred from one object to another. Therefore, the statement "momentum is transferred between objects" is a correct interpretation of the Law of Conservation of Momentum.Rate this question:
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- 46.
Momentum is the result of both mass and density.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Momentum is actually the product of mass and velocity, not density. Density is a measure of how much mass is contained in a given volume, while momentum is a measure of an object's motion. Therefore, the statement that momentum is the result of both mass and density is incorrect.Rate this question:
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- 47.
Which of the following is/are a(n) example(s) of a chemical change?
- A.
Rusting
- B.
Melting
- C.
Burning
- D.
Freezing
Correct Answer(s)
A. Rusting
C. BurningExplanation
Rusting and burning are both examples of chemical changes. Rusting occurs when iron reacts with oxygen in the presence of moisture, forming iron oxide. This is a chemical reaction that results in a change in the composition and properties of the iron. Burning involves a chemical reaction known as combustion, where a substance reacts with oxygen to produce heat, light, and often new substances. Both rusting and burning involve the rearrangement of atoms and the formation of new substances, indicating a chemical change. Melting and freezing, on the other hand, are examples of physical changes as they only involve a change in the state of matter without any alteration in the chemical composition.Rate this question:
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- 48.
Which of the following is/are a(n) example(s) of a physical change?
- A.
Rusting
- B.
Melting
- C.
Burning
- D.
Freezing
Correct Answer(s)
B. Melting
D. FreezingExplanation
Melting and freezing are examples of physical changes because they involve a change in the state of matter without altering the chemical composition of the substance. In melting, a solid substance changes into a liquid state, while in freezing, a liquid substance changes into a solid state. These changes can be reversed by altering the temperature. Rusting and burning, on the other hand, are examples of chemical changes as they involve a transformation of the substance into a different chemical composition.Rate this question:
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- 49.
Dry Ice is an example of Vaporization.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Dry ice is actually an example of sublimation, not vaporization. Sublimation is the process in which a solid directly transitions into a gas without going through the liquid phase. Dry ice, which is solid carbon dioxide, undergoes sublimation when exposed to room temperature, transforming into carbon dioxide gas. Vaporization, on the other hand, refers to the phase change from a liquid to a gas. Therefore, the correct answer is false.Rate this question:
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