Class 10 physics ch 1

 Long type of questions a) What do you understand by the term “potential difference”?


b) What is meant by saying that the potential difference between two points is 1 vol


c) What is the potential difference between the terminals of a battery if 250 joules of work is required to transfer 20 coulombs of charge from one terminal of battery to the othe


d) What is a voltmeter? How is a voltmeter connected in the circuit to measure the potential difference between two points. Explain with the help of a diagra


e) State whether a voltmeter has a high resistance or a low resistance. Give reason for your answe


Answe


a) The amount of work done in moving a unit positive charge from one point to the other is defined as the potential difference between the two point


b) The potential difference between two points is 1 volt means 1 joule of work is done to move 1 coulomb of electric charge from one point to anothe


c) Give


Work done = 25


Charge moved = 2


Potential difference =


We know that potential difference is given a


Potential difference = (Work done)/(Charge move


= (250)/(20) = 12


Therefore, 12.5J of potential difference is required for moving 1 coulomb of charge when the work done is 250


d) A voltmeter is defined as the device that is used for measuring the potential difference between the two points in an electric circuit. The voltmeter is usually connected parallel to the two points where the potential difference needs to be measure


Lakhmir Singh Solutions Class 10 Physics Chapter 1 Electricity


e) The voltmeter has a high resistance because voltmeter needs to take a negligible amount of current from an electric circui


Multiple Choice Questio


Q17. The work done in moving a unit charge across two points in an electric circuit is a measure o


a) Curre


b) Potential differen


c) Resistan


d) Pow


Answe


The correct option is b) Potential differenc


Potential difference is the measure of the work done in moving a unit charge across two points in an electric circui


Q18. The device used for measuring potential difference is known a


a) Potentiomet


b) Ammet


c) Galvanomet


d) Voltmet


Answe


The correct option is d) Voltmet


Voltmeter is the device that is used for measuring potential differenc


Q19. Which of the following units could be used to measure electric charg


a) Ampe


b) Jou


c) Vo


d) Coulo


Answe


The correct option d) Coulo


Coulomb is the unit that is used for measuring electric charg


Q20. The unit for measuring potential difference i


a) Wa


b) O


c) Vo


d) k


Answe


The correct option is c) Vo


Volt is the unit used for measuring the potential differenc


Q21. One coulomb charge is equivalent to the charge obtained i


a) 2.6×1019 electro


b) 6.2×1019 electro


c) 2.65×1018 electro


d) 6.25×1018 elensnsnsn:e.ltr:Whlthmtts:e.mbr:mbltleree?e.err:erererers:t.e.r:ercecentf:nst. 1d.J..5d)s: ?0C0Jn,r.s.r:r.m.r?t?


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Questions ch 1 physics of class 10

 Question 1: By what other name is the unit joule/coulomb called ? Solution : Volt Question 2: Which of the following statements correctly defines a volt ? (a) a volt is a joule per ampere. (b) a volt is a joule per coulomb. Solution : (b) a volt is a joule per coulomb. Question 3: (a) What do the letters p.d. stand for ? (b) Which device is used to measure p.d. ? Solution : (a) p.d. stands for potential difference. (b) Voltmeter is used to measure p.d. Did you check the Prevous Year Questions of Class 10 Electricity? Question 4: What is meant by saying that the electric potential at a point is 1 volt ? Solution : Electric potential at a point is 1 volt means 1 joule of work is done in moving 1 unit positive charge from infinity to that point. Question 5: How much work is done when one coulomb charge moves against a potential difference of 1 volt ? Solution : Potential difference = 1 V Charge moved = 1C Work done = Potential difference x Charge moved = 1 x 1 = 1 J Question 6: What ...
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Class =10 physics

                              Light and reflection All short type questions very short answer type questions q1. by what other name is the unit joule/coulomb calle answer the other name of the unit joule/coulomb is vol volt is the si unit of electric potential or of electromotive force. it is represented by the letter v. volt is a representation of the potential difference between the two points of a current-carrying wire of 1 ampere such that when the power dissipates between these two points, it is equal to 1 wat q2. which of the following statements correctly defines a vol a) a volt is a joule per ampe b) a volt is a joule per coulo answe the correct statement that defined a volt is b) a volt is a joule per coulo volt is a joule per coulomb because joule is a unit of work done while coulomb is a unit for the charge. the ratio of work done to the charge is the definition of potential and volt is the unit of pot...
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