Chapter 14: Gases And Plasmas
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A one-ton blimp hovers in the air. The buoyant force acting on it is
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Zero.
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One ton.
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Less than one ton.
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More than one ton.
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This quiz in Chapter 14: Gases and Plasmas explores key concepts such as the energy sources of atmospheric molecules, differences between gases and plasmas, reasons why atmospheric molecules remain earth-bound, and the characteristics of atmospheric pressure and mass.
Quiz Preview
- 2.
The air in this room has
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Mass.
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Weight.
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Energy.
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All of these
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None of these
Correct Answer
A. All of theseExplanation
The air in a room possesses mass because it is made up of molecules that have mass. It also has weight because weight is the force exerted by gravity on an object, and air is affected by gravity. Additionally, air molecules possess kinetic energy due to their constant motion, so the air in the room also has energy. Therefore, the correct answer is "all of these."Rate this question:
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- 3.
When gas in a container is squeezed to half its volume, its density
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Halves.
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Doubles.
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Quadruples.
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Remains the same.
Correct Answer
A. Doubles.Explanation
When gas in a container is squeezed to half its volume, the same amount of gas particles are now occupying a smaller space. This means that the gas particles are now closer together, resulting in an increase in density. Therefore, the density of the gas doubles when it is squeezed to half its volume.Rate this question:
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- 4.
The faster a fluid moves, the
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Greater its internal pressure.
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Less its internal pressure.
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Internal pressure is unaffected.
Correct Answer
A. Less its internal pressure.Explanation
This is because as a fluid moves faster, its kinetic energy increases. According to Bernoulli's principle, an increase in kinetic energy results in a decrease in pressure. Therefore, the faster a fluid moves, the less its internal pressure.Rate this question:
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- 5.
When a common fluorescent lamp is on, the mercury vapor inside is actually in a
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Gaseous state.
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Liquid state.
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Plasma state.
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Solid state.
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None of these
Correct Answer
A. Plasma state.Explanation
When a common fluorescent lamp is on, the electricity passing through the lamp excites the mercury vapor inside, causing it to emit ultraviolet light. This ultraviolet light then interacts with the phosphor coating on the inside of the lamp, causing it to emit visible light. Plasma is a state of matter in which atoms are ionized and have free-moving electrons and ions. In a fluorescent lamp, the mercury vapor is ionized, creating a plasma state where the atoms are excited and emit light. Therefore, the correct answer is plasma state.Rate this question:
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- 6.
Atmospheric molecules do not fly off into outer space because of
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Their relatively high speeds.
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Their relatively low densities.
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Earth gravitation.
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Cohesive forces.
Correct Answer
A. Earth gravitation.Explanation
The reason atmospheric molecules do not fly off into outer space is due to Earth's gravitation. Gravity pulls the molecules towards the Earth's surface, preventing them from escaping into outer space. The other options, such as their speeds, low densities, and cohesive forces, do not play a significant role in keeping the molecules within the atmosphere.Rate this question:
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- 7.
When gas in a container is squeezed to half its volume and the temperature remains the same, the gas pressure
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Halves.
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Doubles.
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Quadruples.
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Remains the same.
Correct Answer
A. Doubles.Explanation
When gas in a container is squeezed to half its volume and the temperature remains the same, the gas pressure doubles. This is because according to Boyle's Law, the pressure of a gas is inversely proportional to its volume when the temperature is constant. Therefore, when the volume is halved, the pressure must double to maintain the same temperature.Rate this question:
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- 8.
When water is turned on in a shower, the shower curtain moves towards the water. This has to do with
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Capillary action.
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Surface tension.
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Heat capacity.
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Pressure of a moving fluid.
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None of these
Correct Answer
A. Pressure of a moving fluid.Explanation
When water is turned on in a shower, the shower curtain moves towards the water because of the pressure of the moving fluid. As water flows out of the showerhead, it creates a high-pressure zone that pushes against the curtain, causing it to move. This phenomenon is similar to how wind can push objects in its path. Capillary action, surface tension, and heat capacity do not directly explain the movement of the shower curtain in this scenario.Rate this question:
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- 9.
Suspend a pair of Ping-Pong balls from two strings so there is a small space between them. If you blow air between the balls, they will swing
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Toward each other.
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Apart from each other.
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Away from the air stream, but not necessarily toward or apart from each other.
Correct Answer
A. Toward each other.Explanation
When air is blown between the Ping-Pong balls, it creates a region of low pressure. This low pressure area causes the balls to move towards each other. This is because the higher pressure outside the low pressure region pushes the balls towards the area of lower pressure, causing them to swing towards each other.Rate this question:
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- 10.
Atmospheric pressure is caused by the
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Density of the atmosphere.
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Weight of the atmosphere.
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Temperature of the atmosphere.
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Effect of the sun's energy on the atmosphere.
Correct Answer
A. Weight of the atmosphere.Explanation
Atmospheric pressure is caused by the weight of the atmosphere. The air molecules in the atmosphere have mass and are pulled towards the Earth's surface due to gravity. As a result, the weight of the atmosphere exerts pressure on the Earth's surface and all objects within it. This pressure decreases with increasing altitude since there is less atmosphere above. Therefore, the weight of the atmosphere is responsible for the atmospheric pressure experienced at any given location.Rate this question:
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- 11.
In a vacuum a marshmallow becomes
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Larger.
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Smaller.
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Flat.
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A hollow shell.
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None of the above choices
Correct Answer
A. Larger.Explanation
In a vacuum, the air pressure is significantly reduced or eliminated. This causes the air trapped inside the marshmallow to expand, making it larger. Without the external air pressure pushing against it, the marshmallow can expand freely. Therefore, in a vacuum, a marshmallow becomes larger.Rate this question:
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- 12.
If a strong wind from the west breaks a window in the north wall of a house, most of the glass will fall
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Upward.
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Inside the house.
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Outside the house.
Correct Answer
A. Outside the house.Explanation
When a strong wind from the west breaks a window in the north wall of a house, the majority of the glass will fall outside the house. This is because the force of the wind will push the shattered glass fragments away from the house, causing them to fall in the direction of the wind. Additionally, the force of gravity will also contribute to the glass falling outside rather than inside the house.Rate this question:
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- 13.
The depth to which an inverted drinking glass must be pushed beneath the surface of water so that the volume of enclosed air is squeezed to half is
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76 cm.
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10.3 m.
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14.7 m.
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20.6 m.
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29.4 m.
Correct Answer
A. 10.3 m. -
- 14.
Which of the following bodies is comprised mostly of plasma?
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Earth
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Moon
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Sun
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All of these
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None of these
Correct Answer
A. SunExplanation
The Sun is comprised mostly of plasma. Plasma is a state of matter in which atoms are ionized, meaning they have lost or gained electrons. The Sun is a massive ball of hot, glowing gases, primarily hydrogen and helium, which are in a plasma state due to the extreme temperatures and pressures. Plasma is often referred to as the fourth state of matter, and it is the most abundant state in the universe. The Earth and Moon, on the other hand, are primarily composed of solid and liquid materials, not plasma.Rate this question:
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- 15.
Most of the mass of material that makes up a plasma is
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Electrically neutral.
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Always positively charged.
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Always negatively charged.
Correct Answer
A. Electrically neutral.Explanation
Plasma is a state of matter in which atoms or molecules have been ionized, resulting in the presence of free electrons and positive ions. Despite the presence of charged particles, the overall mass of the plasma is electrically neutral because the number of positive ions is equal to the number of free electrons. This balance between positive and negative charges ensures that the plasma as a whole remains electrically neutral.Rate this question:
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- 16.
Most of the matter in the universe is in the
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Solid state.
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Liquid state.
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Gaseous state.
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Plasma state.
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None of these
Correct Answer
A. Plasma state.Explanation
The correct answer is plasma state. Plasma is considered the fourth state of matter and is formed when a gas is heated to extremely high temperatures or subjected to a strong electric field. In this state, the atoms or molecules are stripped of their electrons, resulting in a collection of positively charged ions and negatively charged electrons. Plasma is found in stars, lightning, and certain types of man-made devices like plasma TVs. Therefore, most of the matter in the universe is in the plasma state.Rate this question:
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- 17.
A plasma differs from a gas in that
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A plasma differs from a gas in that
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It is hotter than a gas.
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It is electrically conducting.
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Its atoms are boosted to higher atomic numbers.
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All of these
Correct Answer
A. It is electrically conducting.Explanation
A plasma differs from a gas in that it is electrically conducting. Unlike a gas, which consists of neutral atoms or molecules, a plasma is made up of charged particles, such as ions and free electrons. These charged particles allow a plasma to conduct electricity and respond to electric and magnetic fields. This property of being electrically conducting is a fundamental characteristic that distinguishes a plasma from a gas.Rate this question:
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- 18.
In drinking soda or water through a straw, we make use of
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Capillary action.
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Surface tension.
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Atmospheric pressure.
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Bernoulli's principle.
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None of these
Correct Answer
A. Atmospheric pressure.Explanation
When we drink soda or water through a straw, we make use of atmospheric pressure. When we suck on the straw, we create a lower pressure inside the straw than the atmospheric pressure outside. This pressure difference causes the liquid to rise up the straw and into our mouths. Capillary action refers to the ability of a liquid to flow against gravity in a narrow tube, which is not applicable in this scenario. Surface tension is the force that causes the surface of a liquid to behave like a stretched elastic sheet, but it is not directly involved in drinking through a straw. Bernoulli's principle relates to the relationship between the speed and pressure of a fluid, but it is not relevant in this context.Rate this question:
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- 19.
A suction cup sticks to a wall. It is
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Pulled to the wall by the vacuum.
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Pushed to the wall by the atmosphere.
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Both of these
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Both of these
Correct Answer
A. Pushed to the wall by the atmosphere.Explanation
The suction cup sticks to the wall because it is pushed to the wall by the atmosphere. The atmosphere exerts pressure on the surface of the suction cup, creating a force that pushes it against the wall. This atmospheric pressure is greater than the pressure inside the suction cup, causing it to stick to the wall.Rate this question:
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- 20.
About how high can water be theoretically lifted by a vacuum pump at sea level?
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Less than 10.3 m
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More than 10.3 m
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10.3 m
Correct Answer
A. 10.3 mExplanation
A vacuum pump works by creating a partial vacuum, which decreases the pressure in a closed system. At sea level, the maximum height that water can be lifted by a vacuum pump is 10.3 meters. This is because the atmospheric pressure at sea level can support a column of water approximately 10.3 meters high. If the water column is higher than this, the atmospheric pressure will not be sufficient to lift it, and the water will not be able to be lifted any higher.Rate this question:
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- 21.
The Bernoulli effect causes passing ships to be drawn together when the ships are close and moving in
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The same direction.
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Opposite directions.
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Either the same or opposite directions.
Correct Answer
A. Either the same or opposite directions.Explanation
The Bernoulli effect is the phenomenon where an increase in the speed of a fluid (in this case, water) results in a decrease in pressure. When two ships are close to each other and moving in the same direction, the faster-moving ship creates an area of low pressure between the ships, causing them to be drawn together. Similarly, when the ships are moving in opposite directions, the difference in pressure on either side of the ships causes them to be drawn towards each other. Therefore, the Bernoulli effect can cause passing ships to be drawn together either when they are moving in the same direction or in opposite directions.Rate this question:
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- 22.
A common 5-liter metal can will float in air if it is
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Evacuated of air.
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Filled with a very large amount of helium.
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Thrown high enough.
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A can will not float in air unless the displaced air weighs more than the can and its contents.
Correct Answer
A. A can will not float in air unless the displaced air weighs more than the can and its contents.Explanation
The given answer explains that a can will not float in air unless the displaced air weighs more than the can and its contents. This is because the principle of buoyancy states that an object will float in a fluid if the weight of the fluid displaced by the object is greater than the weight of the object itself. In this case, the can will only float if the weight of the air it displaces is greater than the weight of the can and its contents combined.Rate this question:
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- 23.
Airplane flight best illustrates
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Archimedes' principle.
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Pascal's principle.
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Bernoulli's principle.
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Boyle's law.
Correct Answer
A. Bernoulli's principle.Explanation
Airplane flight best illustrates Bernoulli's principle. According to Bernoulli's principle, as the speed of a fluid (or air) increases, its pressure decreases. In the case of an airplane, the curved shape of the wings causes the air to move faster over the top surface compared to the bottom surface. This creates a pressure difference, with lower pressure on top and higher pressure on the bottom, resulting in lift. This lift force allows the airplane to overcome gravity and stay in the air. Therefore, airplane flight is a prime example of Bernoulli's principle in action.Rate this question:
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- 24.
A balloon is buoyed up with a force equal to the
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Weight of air it displaces.
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Density of surrounding air.
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Atmospheric pressure.
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Weight of the balloon and contents.
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All of these
Correct Answer
A. Weight of air it displaces.Explanation
The correct answer is "weight of air it displaces." When a balloon is filled with air or gas, it displaces an amount of air equal to its volume. According to Archimedes' principle, an object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid it displaces. In this case, the balloon experiences a buoyant force equal to the weight of the air it displaces, which allows it to float in the surrounding air. The other options, such as density of surrounding air, atmospheric pressure, and weight of the balloon and contents, are not accurate explanations for why a balloon is buoyed up.Rate this question:
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- 25.
Alcohol is less dense than water. If alcohol is used to make a barometer on a day when atmospheric pressure is normal, the height of the alcohol column would be
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Less than 10.3 m.
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More than 10.3 m.
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10.3 m.
Correct Answer
A. More than 10.3 m.Explanation
Alcohol is less dense than water, so if it is used to make a barometer, the height of the alcohol column would be more than 10.3 m. This is because the height of the column in a barometer is directly proportional to the density of the liquid used. Since alcohol is less dense than water, the column would need to be taller to balance the atmospheric pressure.Rate this question:
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- 26.
Wind blowing over the top of a hill
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Increases atmospheric pressure there.
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Decreases atmospheric pressure there.
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Does not affect atmospheric pressure there.
Correct Answer
A. Decreases atmospheric pressure there.Explanation
When wind blows over the top of a hill, it creates a phenomenon known as Bernoulli's principle. According to this principle, as the wind moves faster over the hill, the air pressure decreases. This is because the faster-moving air creates a lower pressure zone. As a result, the atmospheric pressure over the top of the hill decreases. Therefore, the correct answer is that wind blowing over the top of a hill decreases atmospheric pressure there.Rate this question:
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- 27.
In a vacuum, an object has no
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Buoyant force.
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Mass.
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Weight.
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Temperature.
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All of these
Correct Answer
A. Buoyant force.Explanation
In a vacuum, there is no medium or fluid to exert a buoyant force on an object. Buoyant force is the upward force exerted by a fluid on a submerged or immersed object, which counteracts the weight of the object. In the absence of a fluid, there is no buoyant force acting on the object. Therefore, the correct answer is buoyant force.Rate this question:
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- 28.
The main difference between gases and plasmas has to do with
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The kinds of elements involved.
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Interatomic spacing.
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Electrical conduction.
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Fluid pressure.
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The proportion of matter to antimatter in the universe.
Correct Answer
A. Electrical conduction.Explanation
The main difference between gases and plasmas is electrical conduction. Gases are composed of neutral atoms or molecules that do not conduct electricity, while plasmas are made up of charged particles (ions and electrons) that can conduct electricity. This is because plasmas have enough energy to ionize atoms, causing them to lose or gain electrons and become charged. As a result, plasmas can carry electrical currents and exhibit unique properties such as the ability to generate magnetic fields and emit light.Rate this question:
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- 29.
A bubble of air released from the bottom of a lake
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Rises to the top at constant volume.
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Becomes smaller as it rises.
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Becomes larger as it rises.
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Alternately expands and contracts as it rises.
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None of these
Correct Answer
A. Becomes larger as it rises.Explanation
As the bubble of air rises from the bottom of the lake, the pressure surrounding the bubble decreases. According to Boyle's law, the volume of a gas is inversely proportional to its pressure. Therefore, as the pressure decreases, the volume of the bubble increases, causing it to become larger as it rises.Rate this question:
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- 30.
A swimmer cannot use a long hose to snorkel more than a meter deep because air
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In the lungs cannot easily be expelled.
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Tends to liquify in the snorkel tube.
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Is buoyed up leaving the swimmer breathless.
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At the surface will not freely enter the higher-pressure region in the compressed lungs.
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All of these
Correct Answer
A. At the surface will not freely enter the higher-pressure region in the compressed lungs.Explanation
When a swimmer uses a long hose to snorkel more than a meter deep, the air at the surface will not freely enter the higher-pressure region in the compressed lungs. This is because the pressure increases as the swimmer goes deeper, making it difficult for the air to enter the lungs against the higher pressure. As a result, the swimmer will not be able to breathe properly and may feel breathless.Rate this question:
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- 31.
Compared to all liquids, solids, and gases in the universe, plasmas are the most
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Abundant.
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Rare.
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We don't have enough information at this time.
Correct Answer
A. Abundant.Explanation
Plasmas are the most abundant state of matter in the universe. While solids, liquids, and gases are commonly found on Earth, plasmas are more prevalent in outer space. Plasmas are formed when gas is heated to extreme temperatures, causing the atoms to ionize and become electrically charged. This ionized gas makes up stars, nebulae, and other celestial objects, making plasmas the most abundant form of matter in the universe.Rate this question:
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- 32.
It would be easier to pull evacuated Magdeburg hemispheres apart when they are
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Held upside down.
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At sea level.
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20 km beneath the ocean surface.
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20 km above the ocean surface.
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None of these
Correct Answer
A. 20 km above the ocean surface.Explanation
When the evacuated Magdeburg hemispheres are held upside down, the pressure inside the hemispheres is equal to the atmospheric pressure, making it difficult to pull them apart. However, when they are 20 km above the ocean surface, the atmospheric pressure decreases significantly, reducing the pressure inside the hemispheres. This lower pressure inside the hemispheres makes it easier to pull them apart.Rate this question:
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- 33.
As a woman holding her breath swims deeper and deeper beneath the water's surface, her density
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Increases.
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Decreases.
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Remains the same.
Correct Answer
A. Increases.Explanation
As a woman holds her breath and swims deeper beneath the water's surface, the pressure increases. This increased pressure compresses the air in her lungs, reducing its volume and increasing her density. As density is mass divided by volume, and mass remains constant, the decrease in volume causes an increase in density. Therefore, her density increases as she swims deeper.Rate this question:
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- 34.
The flight of a blimp best illustrates
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The principle of Archimedes.
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Pascal's principle.
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Bernoulli's principle.
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Boyle's law.
Correct Answer
A. The principle of Archimedes.Explanation
The flight of a blimp best illustrates the principle of Archimedes because blimps rely on the principle of buoyancy, which is a direct application of Archimedes' principle. According to Archimedes' principle, an object immersed in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced by the object. In the case of a blimp, the gas inside the blimp is less dense than the surrounding air, causing the blimp to float in the air. This principle allows blimps to stay afloat and be able to navigate through the atmosphere.Rate this question:
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- 35.
Which of the following is an example of matter in a plasma state?
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Dry ice
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A torch flame
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Molten lava
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None of these
Correct Answer
A. A torch flameExplanation
A torch flame is an example of matter in a plasma state because it consists of ionized gas particles, which are electrically charged. In a torch flame, the high temperature causes the gas molecules to lose electrons, resulting in a plasma state. Dry ice is in a solid state, molten lava is in a liquid state, and none of these options represent matter in a plasma state.Rate this question:
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- 36.
The weight of a 1-square-meter column of air that extends from sea level to the top of the atmosphere is
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101 N.
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10,100 N.
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101,000 N.
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101,000,000 N.
Correct Answer
A. 101,000 N.Explanation
The weight of a column of air is determined by its density and height. As we move higher in the atmosphere, the density of air decreases. However, the height of the column also increases. In this question, the weight of the column is given as 101,000 N, which is the correct answer. This suggests that the density of air decreases enough with height to compensate for the increase in height, resulting in a constant weight for the column of air from sea level to the top of the atmosphere.Rate this question:
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- 37.
A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the same column instead had the same mass of water in it, the height of the water column would be
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1/13.6 times the height of the atmosphere.
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About 3/4 meter.
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10.3 meters.
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About 5.6 kilometers.
Correct Answer
A. 10.3 meters.Explanation
The density of water is about 13.6 times greater than the density of air. Since the mass of the column remains the same, if the same mass of water is used instead of air, the height of the water column would be 1/13.6 times the height of the air column. Therefore, the height of the water column would be approximately 10.3 meters.Rate this question:
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- 38.
Plasmas are a central part of power generation in
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MHD generators.
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Turbo generators.
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Both
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Neither
Correct Answer
A. MHD generators.Explanation
Plasmas are a central part of power generation in MHD generators. MHD generators, or magnetohydrodynamic generators, use the principles of magnetohydrodynamics to convert thermal energy directly into electrical energy. In these generators, a high-temperature plasma is created by heating a gas to extremely high temperatures. This plasma is then passed through a magnetic field, which induces an electric current in the plasma, generating electricity. Therefore, plasmas play a crucial role in the power generation process of MHD generators.Rate this question:
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- 39.
When a gas is heated and becomes a plasma, its electric charge is usually
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Balanced.
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Negative.
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Positive.
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Non-existent.
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None of these
Correct Answer
A. Balanced.Explanation
When a gas is heated and becomes a plasma, its electric charge is usually balanced. This is because plasma is a state of matter where some or all of the electrons have been separated from their parent atoms, creating a mixture of positively charged ions and negatively charged electrons. The positive and negative charges in the plasma are typically equal in magnitude, resulting in a balanced overall electric charge.Rate this question:
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- 40.
As a helium-filled balloon rises in the air, it becomes
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Bigger.
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More dense.
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Heavier.
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All of these
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None of these
Correct Answer
A. Bigger.Explanation
As a helium-filled balloon rises in the air, it becomes bigger. This is because the atmospheric pressure decreases as we go higher in the atmosphere. The helium inside the balloon expands in response to the decrease in pressure, causing the balloon to increase in size.Rate this question:
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- 41.
What is the approximate mass of a 1-square-centimeter column of air that extends from sea level to the top of the atmosphere?
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1 gram
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1 kilogram
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10 kilograms
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100 kilograms
Correct Answer
A. 1 kilogramExplanation
The approximate mass of a 1-square-centimeter column of air that extends from sea level to the top of the atmosphere is 1 kilogram. This is because air has a density of about 1.2 kilograms per cubic meter, and a 1-square-centimeter column of air would have a height of approximately 10,000 meters (the height of the atmosphere). Therefore, the mass of the column can be calculated by multiplying the density by the volume, which is 1.2 kilograms per cubic meter multiplied by 0.0001 cubic meters, resulting in 0.00012 kilograms or 1 kilogram when rounded to the nearest gram.Rate this question:
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- 42.
As a high-altitude balloon sinks lower and lower into the atmosphere, it undergoes a decrease in
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Volume.
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Density.
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Weight.
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Mass.
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None of these
Correct Answer
A. Volume.Explanation
As a high-altitude balloon sinks lower into the atmosphere, the air pressure surrounding the balloon increases. This increased pressure compresses the gas inside the balloon, causing its volume to decrease. The density, weight, and mass of the balloon remain the same, as these properties are determined by the amount of gas and material present in the balloon, which does not change as it descends. Therefore, the correct answer is volume.Rate this question:
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- 43.
An umbrella tends to move upwards on a windy day principally because
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Air gets trapped under the umbrella, warms, and rises.
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Buoyancy increases with increasing wind speed.
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Air pressure is reduced over the curved top surface.
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All of these
Correct Answer
A. Air pressure is reduced over the curved top surface.Explanation
On a windy day, an umbrella tends to move upwards because air pressure is reduced over the curved top surface. As the wind blows, it creates a pressure difference between the upper and lower surfaces of the umbrella. The curved shape of the umbrella causes the air to move faster over the top surface, creating a lower pressure compared to the bottom surface. This pressure difference results in a net upward force on the umbrella, causing it to move upwards. The other options do not fully explain this phenomenon.Rate this question:
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- 44.
Glowing plasma is evident in the light from
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A fluorescent lamp.
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The aurora borealis (northern lights).
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An incandescent lamp.
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Choices A and B are both correct.
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Choices A and C are both correct.
Correct Answer
A. Choices A and B are both correct.Explanation
The explanation for the correct answer, "Choices A and B are both correct," is that glowing plasma is evident in the light from both a fluorescent lamp and the aurora borealis (northern lights). A fluorescent lamp contains a gas that is excited by electricity, causing it to emit light. This light is produced by the glowing plasma within the lamp. Similarly, the aurora borealis is a natural light display that occurs in the Earth's atmosphere when charged particles from the sun collide with atoms and molecules. This collision causes the particles to become excited and emit light, resulting in the glowing plasma seen in the northern lights.Rate this question:
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- 45.
About what percentage of the molecules that make up the atmosphere are below an aircraft that flies at an altitude of 6 kilometers?
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20%
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30%
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40%
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50%
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More than 50%
Correct Answer
A. More than 50%Explanation
At an altitude of 6 kilometers, the majority of the Earth's atmosphere is below the aircraft. Since the atmosphere gradually becomes less dense as altitude increases, it can be inferred that more than 50% of the molecules that make up the atmosphere are below the aircraft at this height.Rate this question:
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- 46.
Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, mercury in the smaller tube will rise
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The same height as in the larger tube.
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Twice as high as mercury in the larger tube.
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Four times as high as mercury in the larger tube.
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More than four times as high as in the larger tube.
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None of these
Correct Answer
A. The same height as in the larger tube.Explanation
The height of mercury in a barometer is determined by the atmospheric pressure pushing down on the mercury in the dish. The pressure is the same regardless of the cross-sectional area of the tube. Therefore, the height of the mercury in the smaller tube will be the same as in the larger tube.Rate this question:
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- 47.
Gas pressure inside an inflated stretched balloon is actually
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Less than air pressure outside the balloon.
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Equal to air pressure outside the balloon.
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Greater than air pressure outside the balloon.
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Impossible to determine without knowing the type of gas.
Correct Answer
A. Greater than air pressure outside the balloon.Explanation
The gas pressure inside an inflated stretched balloon is greater than the air pressure outside the balloon. This is because when the balloon is inflated, the gas molecules inside the balloon collide with the inner surface of the balloon, creating a force that pushes outward. This force, combined with the elasticity of the balloon, causes the gas pressure inside to be greater than the air pressure outside.Rate this question:
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- 48.
Two vertical tubes of equal cross-sectional areas are filled with water and mercury. If water is filled to a depth of 10.3 m and mercury to a depth of 0.76 m, both liquids have equal
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Volumes.
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Densities.
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Weights.
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Viscosity.
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None of these
Correct Answer
A. Weights.Explanation
The weight of a liquid is directly proportional to its depth and density. In this case, the water and mercury are filled to different depths, but since the cross-sectional areas of the tubes are equal, the weight of the water will be equal to the weight of the mercury. Therefore, the correct answer is weights.Rate this question:
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- 49.
A car with closed windows makes a left hand turn. A helium-filled balloon in the car will
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Move to the right.
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Move to the left.
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Move to the front.
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Move to the back.
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Not move.
Correct Answer
A. Move to the left.Explanation
When a car makes a left-hand turn, there is a centrifugal force acting towards the right, pushing objects in the car towards the left. Since the helium-filled balloon is lighter than air, it will be affected by this force and move towards the left side of the car. Therefore, the balloon will move to the left.Rate this question:
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Mar 19, 2023Quiz Edited by
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Dec 18, 2012Quiz Created by
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