Online Test For Second Semester Electrician Students(Module 1 Cell And Batteries)
Questions and Answers
- 1.
Which one do you like?
- A.
Option 1
- B.
Option 2
- C.
Option 3
- D.
Option 4
Correct Answer
A. Option 1 -
- 2.
Which device convertssunlight into electrical energy
- A.
Photo voltaic cell
- B.
Liquid crystal diode
- C.
Light emitting diode
- D.
Light dependentresistor
Correct Answer
A. Photo voltaic cellExplanation
A photo voltaic cell is a device that converts sunlight into electrical energy. It does this through the photovoltaic effect, where photons from sunlight excite electrons in the cell's semiconductor material, creating a flow of electricity. This process allows the photo voltaic cell to generate electrical power from sunlight, making it an efficient and renewable energy source.Rate this question:
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- 3.
Which law secondary cell works?
- A.
Lenzs law
- B.
Jouls law
- C.
Faradays laws of electrolysis
- D.
Faradays laws of electromagnetic induction
Correct Answer
C. Faradays laws of electrolysisExplanation
The correct answer is "faradays laws of electrolysis." Faraday's laws of electrolysis describe the relationship between the amount of substance produced or consumed during an electrolytic reaction and the quantity of electricity passed through the electrolyte. This law explains the process of electrolysis, where an electric current is used to drive a non-spontaneous chemical reaction. Lenz's law, Joule's law, and Faraday's laws of electromagnetic induction are unrelated to the functioning of secondary cells.Rate this question:
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- 4.
What is the unit of electric charge?
- A.
Volt
- B.
Watt
- C.
Ampere
- D.
Coulomb
Correct Answer
D. CoulombExplanation
The unit of electric charge is coulomb. The coulomb is a fundamental unit of charge in the International System of Units (SI). It represents the amount of electric charge transported by a constant current of one ampere in one second. The coulomb is commonly used to measure the quantity of charge in electrical systems and is essential in understanding the behavior of electric currents and electromagnetic interactions.Rate this question:
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- 5.
How the capacity of batteries is specified
- A.
Volt
- B.
Watt
- C.
Volt ampere
- D.
Ampere hour
Correct Answer
D. Ampere hourExplanation
The capacity of batteries is specified in ampere hour, which is a unit of electrical charge. It represents the amount of electrical charge that a battery can deliver over a certain period of time. This unit is commonly used to measure the capacity of batteries because it takes into account both the current (amperes) and the duration (hours) for which the battery can provide a steady flow of current. Therefore, ampere hour is the most appropriate unit to specify the capacity of batteries.Rate this question:
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- 6.
What is the name of defect that bending of plates in secondary cells?
- A.
Buckling
- B.
Local action
- C.
partial short
- D.
Hard sulphation
Correct Answer
A. BucklingExplanation
Buckling is the correct answer because it refers to the defect of bending in plates in secondary cells. Buckling occurs when the plates in a battery become deformed or distorted, typically due to excessive pressure or stress. This can lead to reduced battery performance and potential damage to the battery. Therefore, buckling is the appropriate term to describe the bending of plates in secondary cells.Rate this question:
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- 7.
What is the formula to calculate the mas depositedduring electrolysis
- A.
M=it gm
- B.
M=zit gm
- C.
M=it/z gm
- D.
M=z/it gm
Correct Answer
B. M=zit gmExplanation
The formula to calculate the mass deposited during electrolysis is M = zit gm. This formula takes into account the charge of the ions (z), the current (i), and the time (t) to determine the amount of mass deposited. The product of z, i, and t gives the total charge passed during electrolysis, which is then multiplied by the molar mass (g/mole) to obtain the mass deposited.Rate this question:
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- 8.
What is the out put voltage of lithium cell?
- A.
1.2v
- B.
1.5v
- C.
1.8v
- D.
2.5v
Correct Answer
D. 2.5vExplanation
The output voltage of a lithium cell is typically around 3.7 volts. However, it is important to note that lithium cells can come in various voltages depending on their specific chemistry and design. Therefore, it is incorrect to state that the output voltage of a lithium cell is 2.5 volts.Rate this question:
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- 9.
What is the method of charging if the battery is to be charged for short duration at higher rate?
- A.
Initial charge
- B.
Boost charge
- C.
Trickle charge
- D.
Freshening charge
Correct Answer
B. Boost chargeExplanation
Boost charging is the method of charging a battery for a short duration at a higher rate. This is done to quickly replenish the battery's charge and bring it to a suitable level for normal use. Boost charging is commonly used when a battery needs to be charged quickly, such as in emergency situations or when there is limited time available for charging. This method helps to provide a rapid charge to the battery, allowing it to be used again in a shorter amount of time.Rate this question:
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- 10.
Which electrolyte used to carbon zinc dry cells?
- A.
Dilute sulphuric acid
- B.
Ammonium chloride
- C.
Pottassium hydroxide
- D.
Concentrated hydrochloric acid
Correct Answer
B. Ammonium chlorideExplanation
Ammonium chloride is used as an electrolyte in carbon zinc dry cells. It helps to facilitate the flow of electrons between the zinc anode and the carbon cathode, allowing the cell to generate electrical energy. Ammonium chloride also helps to prevent the build-up of zinc oxide on the anode, which can hinder the cell's performance. Therefore, ammonium chloride is the correct answer for the electrolyte used in carbon zinc dry cells.Rate this question:
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- 11.
Which effect causes by passsing electric curent in liquids?
- A.
Heating
- B.
Lighting
- C.
Magnetic
- D.
Chemical
Correct Answer
D. ChemicalExplanation
Passing an electric current through liquids can cause a chemical effect. This is because the movement of electrons can break down molecules and create new chemical compounds. This process is known as electrolysis and is commonly used in various applications such as electroplating, water splitting, and electrolytic cells.Rate this question:
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- 12.
Which material is used to make negative plates in lead acid battery?
- A.
Lead dioxide
- B.
Sponge lead
- C.
Lead peroxide
- D.
Lead sulphate
Correct Answer
B. Sponge leadExplanation
Sponge lead is used to make negative plates in a lead-acid battery. The negative plates in a lead-acid battery are made from a porous and spongy form of lead, known as sponge lead. This material allows for a larger surface area and increased contact with the electrolyte, which enhances the battery's performance and efficiency. Sponge lead is chosen for its ability to efficiently store and release electrical energy during the battery's charging and discharging cycles.Rate this question:
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- 13.
Which technique is used to control the corrosion of metal surface?
- A.
Anodic protection
- B.
Cathodic protection
- C.
Electrolytic protection
- D.
Electrotatic protection
Correct Answer
B. Cathodic protectionExplanation
Cathodic protection is a technique used to control the corrosion of metal surfaces. It involves making the metal surface the cathode of an electrochemical cell, which results in the reduction of corrosion by supplying electrons to the metal surface. This technique is commonly used in industries such as oil and gas, maritime, and infrastructure to protect metal structures from corrosion caused by environmental factors such as moisture and saltwater.Rate this question:
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- 14.
Which cell is most often used in digital watches ?
- A.
Voltaic
- B.
Lithium
- C.
Mercury
- D.
Silver oxide
Correct Answer
C. MercuryExplanation
Mercury cells are commonly used in digital watches due to their high energy density, long shelf life, and stable voltage output. They provide a reliable power source for digital watch movements, ensuring accurate timekeeping. Additionally, mercury cells are small and lightweight, making them suitable for compact electronic devices like watches.Rate this question:
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- 15.
What is the effect if one cell is connected with reverse polarity in parallel combination circuit?
- A.
Voltage become zero
- B.
Become open circuit
- C.
Will get short circuited
- D.
No effect will function normally
Correct Answer
C. Will get short circuitedExplanation
If one cell is connected with reverse polarity in a parallel combination circuit, it means that the positive terminal of one cell is connected to the negative terminal of the other cell. This creates a short circuit because the current flows in the opposite direction through the cells, causing a high amount of current to flow between them. As a result, the cells will get short-circuited, which can lead to damage or malfunctioning of the circuit.Rate this question:
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- 16.
What is the function of fine selector switch in battery charger?
- A.
Elect of current rating
- B.
Selection of charging time
- C.
Selection of voltage range
- D.
Selection of charging method
Correct Answer
A. Elect of current ratingExplanation
The function of the fine selector switch in a battery charger is to select the desired current rating for charging the battery. This switch allows the user to choose the appropriate current level based on the battery's specifications and charging requirements. By selecting the correct current rating, the charger can provide the optimal charging current to ensure efficient and safe charging of the battery.Rate this question:
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- 17.
What i s the effect on out put power with respect to temperature in solar cells?
- A.
No effect change in temperature
- B.
Increase with increase in temperature
- C.
Decrease with increase in temperature
- D.
Decrease with decrease in temperature
Correct Answer
D. Decrease with decrease in temperatureExplanation
The output power of solar cells decreases with a decrease in temperature. This is because as the temperature decreases, the efficiency of the solar cells decreases, resulting in a lower output power.Rate this question:
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- 18.
What purpose the hydrometr is used during charging of battery?
- A.
Determine the AH capacity
- B.
Assess the battery voltage level
- C.
Assess the discharge level of battery
- D.
Determine the specific gravity of electrolysis
Correct Answer
D. Determine the specific gravity of electrolysisExplanation
The hydrometer is used during the charging of a battery to determine the specific gravity of the electrolyte. The specific gravity of the electrolyte is a measure of its density and can indicate the state of charge of the battery. As the battery charges, the specific gravity of the electrolyte increases, indicating that the battery is becoming fully charged. By measuring the specific gravity, the user can determine if the battery is properly charging and if it has reached its full capacity. This helps to ensure that the battery is functioning correctly and can provide accurate information about its charge level.Rate this question:
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- 19.
What is the formula for faradays first law of electrolysis?
- A.
M=z/it
- B.
M=zit
- C.
M=it/z
- D.
M=zt/i
Correct Answer
B. M=zitExplanation
The formula for Faraday's first law of electrolysis is M = zit, where M represents the mass of the substance deposited or liberated at the electrode, z is the electrochemical equivalent, i is the current, and t is the time. This formula shows the relationship between the amount of substance deposited or liberated during electrolysis and the current and time.Rate this question:
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- 20.
Which is used as an electrolyte in lead acid battery?
- A.
Hydrochloric acid
- B.
Ammonium chloride
- C.
Pottassium hydroxide
- D.
Diluted sulphuric acid
Correct Answer
D. Diluted sulphuric acidExplanation
Diluted sulfuric acid is used as an electrolyte in lead-acid batteries. This is because sulfuric acid dissociates into hydrogen ions (H+) and sulfate ions (SO4^2-) in solution, allowing for the flow of electric current. The hydrogen ions participate in the redox reactions that occur during the charging and discharging of the battery, while the sulfate ions help maintain electrical neutrality. Additionally, sulfuric acid is able to provide the necessary acidity for the reactions to occur efficiently.Rate this question:
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- 21.
What is the out come at the positive plate,after the chemical reaction in lead acid battery during charging
- A.
Sponge lead
- B.
Lead peroxide
- C.
Lead sulphate
- D.
Lead slphate+water
Correct Answer
B. Lead peroxideExplanation
During the charging process of a lead-acid battery, a chemical reaction occurs at the positive plate. This reaction involves the conversion of lead dioxide (PbO2) into lead peroxide (PbO4), which is the correct answer. Lead peroxide is formed as a result of the charging process and is essential for the battery's functionality. It helps in the conversion of electrical energy into chemical energy, allowing the battery to store and release electricity efficiently.Rate this question:
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