Neets Quiz 1 MCQ With Answers

When electrolyte comes in contact with the skin, the immediate first aid treatment that should be given is to flush the affected area with fresh water. This is because fresh water helps to dilute and remove the electrolyte from the skin, reducing the risk of further damage or injury. Flushing with fresh water can help to minimize the potential harmful effects of the electrolyte on the skin and prevent any potential complications.

A battery with a capacity of 600 ampere-hours should provide 3 amperes for a maximum of 200 hours. This can be calculated by dividing the battery capacity (600) by the current (3). The result is 200, indicating that the battery can provide 3 amperes for 200 hours before it is completely drained.

When selecting a primary cell as a power source, all of the factors mentioned should be considered. The power requirement is important to ensure that the cell can provide enough power for the intended application. The type of electrolyte used is significant as it affects the cell's performance and lifespan. The container material is also crucial as it determines the cell's durability and compatibility with the environment. Considering all of these factors is necessary to make an informed decision and choose the most suitable primary cell for the specific power needs.

The construction of a NICAD cell differs from a lead-acid cell in all three aspects mentioned. The electrolyte used in a NICAD cell is typically potassium hydroxide, while a lead-acid cell uses sulfuric acid. The material of the anode in a NICAD cell is usually made of cadmium, whereas a lead-acid cell has a lead anode. Similarly, the material of the cathode differs as well, with a NICAD cell using nickel oxide and a lead-acid cell using lead dioxide. Therefore, all of the above options are correct.

The advantages of using a manganese-dioxide-alkaline-zinc cell over the zinc-carbon cell include better voltage stability, longer storage life, and the ability to operate over a wide temperature range. The manganese-dioxide-alkaline-zinc cell provides a more stable voltage output, ensuring consistent performance. It also has a longer storage life, meaning it can be stored for longer periods without losing its charge. Additionally, it can operate effectively in a wide range of temperatures, making it more versatile in various environments.

Electrochemical action refers to the process that occurs inside a cell. This term describes the chemical reactions and electrical currents that take place within a cell, such as in a battery or in biological cells. It involves the movement of ions and electrons, leading to the conversion of chemical energy into electrical energy or vice versa.

A battery is rated according to a 20-hour rate of discharge at 300 ampere-hours. This means that the battery is designed to deliver its rated capacity of 300 ampere-hours over a period of 20 hours. To calculate the maximum current that will allow the battery to deliver its rated capacity, we divide the rated capacity (300 ampere-hours) by the discharge time (20 hours). This gives us a current of 15 amperes. Therefore, the maximum current that will allow the battery to deliver its rated capacity is 15 amperes.

Shorting of a cell refers to the act of connecting the anode and cathode terminals of the cell directly without any load in the circuit. This creates a low resistance path for the current to flow, bypassing the intended load. As a result, a large amount of current is drawn from the cell, which can lead to overheating, damage, or even explosion of the cell. Therefore, shorting a cell is considered unsafe and can result in the degradation or failure of the cell.

An electrical cell is designed to convert chemical energy into electrical energy. This is achieved through a chemical reaction that takes place within the cell, causing a flow of electrons and generating an electric current. The chemical energy stored in the cell's components, such as the electrolyte and electrodes, is converted into electrical energy that can be used to power various devices or systems.

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The correct answer is "Each of the above". This means that all of the conditions mentioned in the options can cause the primary cell to be completely discharged. If the cathode is completely eaten away, there will be no more material available for the cell to generate electricity. If the active ingredient in the electrolyte is used up, the chemical reaction that produces electricity will no longer occur. And if the voltage of the cell is reduced to zero, it means that there is no more electrical potential difference to drive the flow of electrons. Therefore, all of these conditions can lead to a completely discharged primary cell.

The three basic parts of a cell are electrodes, electrolyte, and container. Electrodes are the conductive materials that allow the flow of electrons in and out of the cell. The electrolyte is a solution that contains ions and facilitates the movement of these ions between the electrodes. The container holds the electrodes and electrolyte together, providing a physical structure for the cell.

The common name for a manganese dioxide-alkaline zinc cell is an alkaline cell. This type of cell is commonly used in household devices such as remote controls, flashlights, and toys. It is known for its long-lasting power and ability to provide a steady voltage output. The alkaline cell gets its name from the alkaline electrolyte used in the cell, which is typically potassium hydroxide.

Distilled water should be added to the electrolyte to bring it to the proper level. This is because distilled water is pure and does not contain any impurities or minerals that could affect the chemical reactions happening in the battery. Adding tap water, sulfuric acid, or potassium hydroxide could introduce impurities or alter the chemical composition of the electrolyte, which could negatively affect the battery's performance.

Connecting the negative terminal of a voltage source to the cathode of the cell and the positive terminal of the voltage source to the anode of the cell will recharge a secondary cell. This is because during the recharge process, the flow of electrons is reversed, causing the chemical reactions in the cell to be reversed as well. This allows the cell to store energy again, replenishing its charge.

To flush a hydrometer, fresh water should be used. This is because fresh water is a neutral liquid that does not contain any chemicals or substances that could potentially contaminate the hydrometer or affect its accuracy. Using sulfuric acid or salt water could be corrosive and damage the hydrometer, while a solution of baking soda and water could introduce foreign particles or residues that may interfere with the readings. Therefore, fresh water is the safest and most suitable option for flushing a hydrometer.

When a battery is being charged at the proper rate, steady gassing may occur. Gassing is the process in which hydrogen and oxygen gases are released from the electrolyte in the battery. Steady gassing refers to a controlled and consistent release of these gases, which is normal during the charging process. It indicates that the battery is functioning correctly and the charging rate is appropriate. Intermittent or violent gassing would suggest an issue with the charging process, such as overcharging or a faulty battery.

When all the lead sulfate in a lead-acid cell is converted to sulfuric acid, lead peroxide, and sponge lead, it indicates that the cell is fully charged. This conversion process is a result of the charging process, where electrical energy is used to convert the lead sulfate back into its original components. Therefore, when this conversion is complete, it signifies that the cell has reached its maximum capacity and is ready for use.

The correct answer is "Lead peroxide, sponge lead, sulfuric acid, and water." In a fully charged lead-acid cell, the anode is made of lead peroxide, the cathode is made of sponge lead, and the electrolyte is sulfuric acid and water. This composition allows for the chemical reactions necessary for the cell to function properly. Zinc, carbon, and water are not the correct components for a fully charged lead-acid cell. Carbon, lead, sulfuric acid, and water are also not the correct components. Nickel, cadmium, potassium hydroxide, and water are the components of a nickel-cadmium battery, not a lead-acid cell.

The lead-acid cell is an example of a secondary cell because it can be recharged and reused multiple times. Unlike primary cells, which are disposable and cannot be recharged, secondary cells can be regenerated by passing an electric current through them in the opposite direction of discharge. The lead-acid cell is commonly used in automotive batteries and other applications that require a reliable and rechargeable power source.

In a dry cell, the consistency of the electrolyte is paste. This means that the electrolyte is in a semi-solid state, with a thick and sticky texture. The paste consistency allows for better contact between the electrolyte and the electrodes, ensuring efficient flow of ions and electricity within the cell. It also helps to prevent leakage and maintain the stability of the cell.

Normal routine charges follow the nameplate data in restoring a battery to its charged condition during the ordinary cycle of operation. This means that the charging process is carried out according to the manufacturer's specifications and recommendations for the specific battery. The normal routine charge is designed to ensure that the battery is restored to its optimal charged state without causing any damage or overcharging.

Silver-zinc cells are commonly used in emergency equipment batteries. These batteries are designed to provide reliable power during critical situations such as power outages or emergencies. They offer high energy density, long shelf life, and good performance at high temperatures. Due to these characteristics, silver-zinc cells are suitable for powering emergency equipment like flashlights, radios, medical devices, and emergency backup systems.

The first step in performing maintenance on a secondary-cell battery is to check the technical manual for information on the specific type of battery. This is important because different types of batteries may have different maintenance requirements and procedures. The technical manual will provide guidance on how to properly maintain and care for the specific type of battery being used.

When local action occurs in a cell, impurities rise to the surface of the electrolyte. Local action refers to the occurrence of small-scale chemical reactions within the cell that do not contribute to the overall functioning of the cell. These reactions can cause the formation of impurities, which then accumulate and rise to the surface of the electrolyte. This can lead to reduced efficiency and performance of the cell over time.

The function of the carbon electrode in a zinc-carbon primary cell is to supply a return path for current. When the cell is in use, the carbon electrode allows the flow of electrons from the zinc electrode to the electrolyte, completing the circuit and allowing the current to flow. Without the carbon electrode, the current would not be able to return to complete the circuit, and the cell would not be able to function properly.

A battery is a device that converts chemical energy into electrical energy. It consists of one or more cells, where each cell contains two electrodes (a positive and a negative) and an electrolyte. When a cell is connected to a circuit, a chemical reaction occurs within the cell, causing electrons to flow from the negative electrode to the positive electrode, creating an electrical current. Therefore, a minimum of one cell is necessary to form a battery.

Venting the cell is a method used to control polarization in a cell because it allows the release of gas buildup, which can cause polarization. When a cell operates, gas bubbles can form at the electrodes, creating a barrier that hinders the flow of current. Venting the cell provides a way for these gas bubbles to escape, preventing polarization and maintaining efficient cell performance.

Increasing the room ventilation is the appropriate action to take if violent gassing occurs during the charging of a battery. This is because violent gassing indicates that there is excessive gas buildup, which can be dangerous if not properly ventilated. Increasing the room ventilation helps to disperse the gas and prevent any potential hazards. Decreasing the room temperature, increasing or decreasing the charging rate are not directly related to addressing the issue of violent gassing.

When a primary cell is discharging, the cathode becomes positively charged due to a loss of electrons. Negative ions are attracted to the cathode because opposite charges attract each other. Therefore, the positive charge caused by a loss of electrons is what causes negative ions to be attracted to the cathode during the discharge of a primary cell.

In a common type of dry cell, the zinc container serves as the cathode. The cathode is the electrode where reduction reactions occur during the cell's operation. In this type of dry cell, the zinc container acts as the negative terminal and is the site of the reduction reaction, where zinc atoms gain electrons. This reaction provides the necessary flow of electrons for the cell to generate electrical energy. Therefore, the zinc container is the correct answer for the cathode in a common type of dry cell.

When a cell is polarized, it means that the chemical reactions within the cell have caused a buildup of charge on the electrodes, creating an imbalance. This buildup of charge increases the internal resistance of the cell, making it more difficult for current to flow. As a result, the output voltage of the cell decreases because the voltage across the internal resistance also decreases. Therefore, the correct answer is that polarization increases the internal resistance, thereby decreasing the output voltage.

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When a primary cell is discharging, the anode becomes negatively charged due to an excess of electrons. This negative charge attracts the positively charged hydrogen ions, causing the hydrogen to be attracted to the anode.

The mercury cell is described as having a very stable output voltage. This means that the voltage it produces remains consistent over time, regardless of changes in the load or other external factors. This characteristic is advantageous in applications where a stable power supply is required, such as in certain medical devices or precision instruments.

Storing the dry cell in a refrigerated space helps to maximize its shelf life. Low temperatures slow down the chemical reactions that occur within the cell, reducing the rate of self-discharge. This helps to preserve the energy stored in the cell for a longer period of time. Additionally, refrigeration helps to keep the cell cool and prevents it from overheating, which can cause damage to the cell and reduce its lifespan. Therefore, storing the dry cell in a refrigerated space is the best option for obtaining maximum shelf life.

The correct answer is Silver-cadmium. Silver-cadmium cells use potassium hydroxide as the active ingredient in the electrolyte.

The correct answer is "Enough so the float will rise without entering the suction bulb." This is because the hydrometer measures the specific gravity of the electrolyte by measuring the buoyancy of the float. If the float enters the suction bulb, it may affect the accuracy of the reading. Therefore, the electrolyte should be drawn to a level where the float can rise freely without entering the suction bulb.

In a primary cell, the cathode is typically made of a material that is reactive with the electrolyte. As the cell discharges, the chemical reactions at the cathode cause the material to dissolve in the electrolyte. This dissolution of the cathode material is what causes the cathode to be "eaten away" or corroded during the discharge process.

The blotting paper in a dry cell serves the purpose of separating the paste from the zinc. This is important because the paste, which contains the electrolyte, needs to be in contact with the zinc in order to generate the chemical reactions that produce electricity. However, direct contact between the paste and the zinc would cause the reactions to occur too quickly and uncontrollably. The blotting paper acts as a barrier, allowing the electrolyte to filter through slowly and maintain a steady and controlled flow of reactions.

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