MCQ on Electric potential difference and Ohm’s law

MCQ on Electric potential difference and Ohm’s law

MCQ on Electric potential difference and Ohm’s law. Practice Electric potential difference and Ohm’s law Multiple Choice Questions and Explanation.

Practice MCQ Questions with Answers for Electric potential difference and Ohm’s law students will gain deep knowledge in Electric potential difference and Ohm’s law Quiz Questions. You can practice all MCQ Questions for Class 10 Physics with Answers for CBSE Board Exam.

Students in this part we are going to learn application based examples n Electric potential difference and Ohm’s law. So let’s start the interesting journey.

Electric potential difference and Ohm’s law

MCQs

Q.1) Amount of work done in bringing a unit positive charge from one end to another end of conductor is called as

a) resistance b) electric current c) potential difference     d) power

Ans: c)

Explanation: c) potential difference = work done/ unit charge

Q.2) Amount of work need to by one coulomb of charges to maintain the potential difference of one volt is

a) one erg b) one calorie c)one watt   d) one joule

Ans: c)

Explanation: d) 1 volt potential difference = 1 joule work done/ 1 coulomb charge

Q.3) SI unit of potential difference is…..

a) volt b) ampere c)watt d) joule

Ans: a)

Explanation: a) SI unit of potential difference is named after Sir Volta

Q.4) A charge of 10 coulomb flow through the conductor for 2 sec, the electric current flowing through the conductor is….

a) 2 A b) 3 A c)4A            d) 5 A

Ans: d)

Explanation: d)

Explanation: d) electric current = charge / time= 10/2 = 5 A

Q.5) A charge of 6 C flows through the copper wire for 2 s connected across cell of potential difference 25 V, the work done is…

a) 100 J b) 150 J c)200 J        d) 250 J

Explanation: b) potentil difference=W/Q

W = VQ

W = 25 × 6 = 150 J

Q.6) Work of 100 joule is done against the potential difference of 9 V; the charges carried in conductor are…..

a) 11 C b) 12 C c)13 C                  d) 14 C

Ans: a)

 

Explanation: a) potential difference,V=W/Q

Q = W/V = 100/9 = 11 C

 

Q.7) Current of 5 ampere is flowing in wire for 2 minutes when p.d. of 20 volt is connected across it; the work done during this is…..

 

a) 1.2× 102 J

b) 1.2× 103  J

c) 1.2 × 104  J

d) 1.2 × 104  J

Explanation: d) potentil difference,V=W/Q

W = VQ = V I t = 20 × 5 × 120

= 12000 joule

Q.8) In a electric circuit work done of 100 J is required to maintain a potential difference of 12 V for 5 sec. Current flowing through the conductor is….

a) 1.5 A

b) 1.7 A

c)1.9 A

d) 2.1 A

Ans: b)

Q.9) Find the potential difference across terminals of copper wire if 4 coulomb of charge performs work of 200 joules

a) 50 V

b) 40 V

c)30 V

d) 30 V

Ans: d)

Explanation: d) potential difference,V=200/4=50 V

Q.10) Total number of electrons that flows through copper wire when connected across pd of 10 V and carries charge of 2 C is….

a) 1.00 × 1019

b) 1.75 × 1019

c)1.25 × 1019

d) 1.50 × 1019

Explanation: c) Total charge = no.of electrons × charge of electron

Q.10) Total number of electrons that flows through copper wire when connected across pd of 10 V and carries charge of 2 C is….

a) 1.00 × 1019

b) 1.75 × 1019

c)1.25 × 1019

d) 1.50 × 1019

Explanation: c) Total charge=no. of electrons × charge of electron

Q.11) Potential difference is measured by instrument……………….

a) ammeter

b) voltmeter

c) potentiometer

d) all of these

Ans: b)

Explanations: b) voltmeter is used to measure p.d. across terminals of conductor.

Q.12) Voltmeter is always connected in…………across battery to measure potential difference provided in circuit.

a) parallel b) series c) both a and b               d) none of these

Ans: a)

Explanations: a) voltmeter is connected in parallel across terminals of battery.

Q.13) A charge of 50 C is transferred from a cloud to ground due to potential difference of 8 MV, energy consumed during this is….

a) 1× 108 joule

b) 2× 108 joule

c) 3 × 108 joule

d) 4× 108 joule

Ans: d)

Explanations: d) potential difference, V = W/Q

Work done=energy consumed = VQ =  8 × 106 ×50=4× 108  joule

Q.14) A wire of resistance 10 kΩ connected across battery of pd 220 V, current flowing through the wire is……..

Ans: b)

Q.15) Which of the following physical conditions of conductor should be kept constant to verify Ohm’s law for the given conductor…..

a) length                 b) area of cross-section             c) temperature       d) all of these

Ans: d)

Explanations: d) temperature, length and area of cross-section should be constant so as to use Ohm’s law.

Q.16) Which of the following equation represents Ohm’s law correctly?

Q.19) A metallic conductor carries current of 2 mA has resistance of 1 MΩ, potential difference across the terminals of conductor is….

a) 1 kV

b) 10 kV

c) 2 kV

d) 20 kV

Ans: c)

Explanations: c) By Ohm’ s law, V=IR

V = 2× 10-3 × 1 ×106 = 2 × 103  V

Q.18) Ohm’s law does not hold good for……

a) DC circuit b) high resistances c) small potential differences     d) semiconductor

Ans: d)

Explanations: d) for semiconductors the graph of potential difference vs electric current is not a remains straight line.

Q.19) The graph of potential difference vs electric current for ohmic conductor is….

a) Straight line passing through origin b) exponentially decreasing curve

c) Exponentially decreasing curve d) straight line intercepting at Y-axis.

Ans: a)

Explanation: Since V is directly proportional to I, graph is always straight line passing through origin.

Q.20) Which of the following conductors in fig is obeying Ohm’s law?

Ans: c)

Explanation: c)Since V is directly proportional to I, graph is always straight line passing through origin.

Updated: May 5, 2021 — 9:25 pm

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