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Which of the following statements is true?
- In order to convert a galvanometer in to an ammeter, a small resistance must be connected in parallel with the galvanometer's coil.
- If the diameter of a w ire is reduced to half its previous value, then its resistance will increase four times.
- During charging of a lead accumulator, the density of sulphuric acid in the accumulator increases.
- In the electrolysis of water oxygen is given off at the cathode.
- a)I, II, III and IV
- b)II, III and IV
- c)I, III and IV
- d)I, II and III
Correct answer is option 'D'. Can you explain this answer?
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Which of the following statements is true? In order to convert a galva...
I. In order to convert a galvanometer into an ammeter, a small resistance must be connected in parallel with the galvanometer's coil.
This statement is true because a galvanometer is a device used to measure small electric currents, while an ammeter is used to measure larger currents. To convert a galvanometer into an ammeter, a small resistance called a shunt must be connected in parallel with the galvanometer's coil. The shunt diverts a portion of the current away from the galvanometer, allowing it to measure the remaining current accurately.
II. If the diameter of a wire is reduced to half its previous value, then its resistance will increase four times.
This statement is true because resistance is inversely proportional to the cross-sectional area of a wire. The cross-sectional area of a wire is directly proportional to the square of its diameter. So, if the diameter of a wire is reduced to half its previous value, the cross-sectional area will be reduced to one-fourth of its original value. Since resistance is inversely proportional to the cross-sectional area, the resistance will increase four times.
III. During charging of a lead accumulator, the density of sulfuric acid in the accumulator increases.
This statement is true because a lead-acid battery, also known as a lead accumulator, consists of electrodes immersed in a sulfuric acid solution. During the charging process, electrical energy is converted into chemical energy, causing the lead plates in the battery to undergo a chemical reaction and convert to lead sulfate. This reaction results in an increase in the density of sulfuric acid in the accumulator.
IV. In the electrolysis of water, oxygen is given off at the cathode.
This statement is false. In the electrolysis of water, water molecules are split into hydrogen and oxygen gas using an electric current. At the cathode (negative electrode), hydrogen gas is given off, while at the anode (positive electrode), oxygen gas is given off. So, the correct statement would be that oxygen is given off at the anode, not the cathode.
Based on the explanations provided, the correct answer is option 'D' - I, II, and III.
This statement is true because a galvanometer is a device used to measure small electric currents, while an ammeter is used to measure larger currents. To convert a galvanometer into an ammeter, a small resistance called a shunt must be connected in parallel with the galvanometer's coil. The shunt diverts a portion of the current away from the galvanometer, allowing it to measure the remaining current accurately.
II. If the diameter of a wire is reduced to half its previous value, then its resistance will increase four times.
This statement is true because resistance is inversely proportional to the cross-sectional area of a wire. The cross-sectional area of a wire is directly proportional to the square of its diameter. So, if the diameter of a wire is reduced to half its previous value, the cross-sectional area will be reduced to one-fourth of its original value. Since resistance is inversely proportional to the cross-sectional area, the resistance will increase four times.
III. During charging of a lead accumulator, the density of sulfuric acid in the accumulator increases.
This statement is true because a lead-acid battery, also known as a lead accumulator, consists of electrodes immersed in a sulfuric acid solution. During the charging process, electrical energy is converted into chemical energy, causing the lead plates in the battery to undergo a chemical reaction and convert to lead sulfate. This reaction results in an increase in the density of sulfuric acid in the accumulator.
IV. In the electrolysis of water, oxygen is given off at the cathode.
This statement is false. In the electrolysis of water, water molecules are split into hydrogen and oxygen gas using an electric current. At the cathode (negative electrode), hydrogen gas is given off, while at the anode (positive electrode), oxygen gas is given off. So, the correct statement would be that oxygen is given off at the anode, not the cathode.
Based on the explanations provided, the correct answer is option 'D' - I, II, and III.
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Which of the following statements is true? In order to convert a galvanometer in to an ammeter, a small resistance must be connected in parallel with the galvanometers coil. If the diameter of a w ire is reduced to half its previous value, then its resistance will increase four times. During charging of a lead accumulator, the density of sulphuric acid in the accumulator increases. In the electrolysis of water oxygen is given off at the cathode.a)I, II, III and IVb)II, III and IVc)I, III and IVd)I, II and IIICorrect answer is option 'D'. Can you explain this answer?
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Which of the following statements is true? In order to convert a galvanometer in to an ammeter, a small resistance must be connected in parallel with the galvanometers coil. If the diameter of a w ire is reduced to half its previous value, then its resistance will increase four times. During charging of a lead accumulator, the density of sulphuric acid in the accumulator increases. In the electrolysis of water oxygen is given off at the cathode.a)I, II, III and IVb)II, III and IVc)I, III and IVd)I, II and IIICorrect answer is option 'D'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Which of the following statements is true? In order to convert a galvanometer in to an ammeter, a small resistance must be connected in parallel with the galvanometers coil. If the diameter of a w ire is reduced to half its previous value, then its resistance will increase four times. During charging of a lead accumulator, the density of sulphuric acid in the accumulator increases. In the electrolysis of water oxygen is given off at the cathode.a)I, II, III and IVb)II, III and IVc)I, III and IVd)I, II and IIICorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is true? In order to convert a galvanometer in to an ammeter, a small resistance must be connected in parallel with the galvanometers coil. If the diameter of a w ire is reduced to half its previous value, then its resistance will increase four times. During charging of a lead accumulator, the density of sulphuric acid in the accumulator increases. In the electrolysis of water oxygen is given off at the cathode.a)I, II, III and IVb)II, III and IVc)I, III and IVd)I, II and IIICorrect answer is option 'D'. Can you explain this answer?.
Which of the following statements is true? In order to convert a galvanometer in to an ammeter, a small resistance must be connected in parallel with the galvanometers coil. If the diameter of a w ire is reduced to half its previous value, then its resistance will increase four times. During charging of a lead accumulator, the density of sulphuric acid in the accumulator increases. In the electrolysis of water oxygen is given off at the cathode.a)I, II, III and IVb)II, III and IVc)I, III and IVd)I, II and IIICorrect answer is option 'D'. Can you explain this answer? for UPSC 2024 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about Which of the following statements is true? In order to convert a galvanometer in to an ammeter, a small resistance must be connected in parallel with the galvanometers coil. If the diameter of a w ire is reduced to half its previous value, then its resistance will increase four times. During charging of a lead accumulator, the density of sulphuric acid in the accumulator increases. In the electrolysis of water oxygen is given off at the cathode.a)I, II, III and IVb)II, III and IVc)I, III and IVd)I, II and IIICorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for UPSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is true? In order to convert a galvanometer in to an ammeter, a small resistance must be connected in parallel with the galvanometers coil. If the diameter of a w ire is reduced to half its previous value, then its resistance will increase four times. During charging of a lead accumulator, the density of sulphuric acid in the accumulator increases. In the electrolysis of water oxygen is given off at the cathode.a)I, II, III and IVb)II, III and IVc)I, III and IVd)I, II and IIICorrect answer is option 'D'. Can you explain this answer?.
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