JEE Main Current Electricity PYQ Important Questions

JEE Main Current Electricity PYQ Important Questions: One of the most significant JEE Main physics exam topics is current electricity. Candidates studying for JEE Mains should be aware that approximately 4-5 questions from this section are asked each year.  Similarly, applicants who are adequately prepared, especially for the current electricity part, are expected to surpass the JEE Main cutoff with relative ease. To understand the toughness level of the questions asked, educators and previous year's toppers advise students to practise JEE Main current electricity questions from past years. Moreover, it enables students to gain an upper hand by assisting them to comprehend the type of questions that the authorities ask on current electricity. With this information, students can regularly practise questions and solidify their foundational ideas. Along with the most significant sections and books students can consult when preparing for the JEE Main physics paper in general and the current electricity section in particular, we have also provided the previous year current electricity questions from JEE Main here in this article.

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JEE Main Year Wise Weightage of Current Electricity Questions

In order to prepare effectively for the JEE Main physics exam, students must be aware of the importance of current electricity. The year wise weightage of current electricity in JEE Main has been mentioned in the below table.

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Important JEE Main Current Electricity Questions

To learn about the current electricity questions from the previous year, candidates studying for boards and JEE Main should examine this section. We have included all the answers and a thorough explanation of each question for the benefit of the applicants.

Q1: Drift speed of electrons, when 1.5 A of current flows in a copper wire of cross-sectional area 5 mm2 is v. If the electron density of copper is 9 × 1028/m3 the value of v in mm/s is close to (Take charge of electron to be = 1.6 × 10–19 C)

(A) 3

(B) 0.2

(C) 2

(D) 0.02

Correct Answer: (D) 0.02

Q2: Two equal resistances when connected in series to a battery consume electric power of 60 W. If these resistances are now connected in parallel combination to the same battery, the electric power consumed will be

(A) 240 W

(B)120 W

(C) 60 W

(D) 30 W

Correct Answer: (A) 240 W

Q3: A current of 2 mA was passed through an unknown resistor which dissipated a power of 4.4 W. Dissipated power when an ideal power supply of 11 V is connected across it is

(A) 11 × 10–4 W

(B) 11 × 10–5 W

(C) 11 × 105 W

(D) 11 × 10–3 W

Correct Answer: (B) 11 × 10–5 W

Q4: An ideal battery of 4 V and resistance R are connected in series in the primary circuit of a potentiometer of length 1 m and resistance 5Ω. The value of R, to give a potential difference of 5 mV across 10 cm of potentiometer wire is

(A) 490

(B) 495

(C) 395

(D) 480

Correct Answer: (C) 395

Q5: A cell of internal resistance r drives current through an external resistance R. The power delivered by the cell to the external resistance will be maximum when

(A) R = 0.001 r

(B) R = r

(C) R = 2r

(D) R = 1000 r

Correct Answer: (B) R = r

Q6: A metal wire of resistance 3 is elongated to make a uniform wire of double its previous length. This new wire is now bent and the ends joined to make a circle. If two points on this circle make an angle 60° at the centre, the equivalent resistance between these two points will be

(A) (7/2) Ω

(B) (5/2) Ω

(C) (12/5) Ω

(D) (5/3) Ω

Correct Answer: (D) (5/3) Ω

Q7: On interchanging the resistances, the balance point of a meter bridge shifts to the left by 10 cm. The resistance of the combination is 1 kΩ. How much was the resistance on the left slot before the interchange?

(A) 990

(B) 505

(C) 550

(D) 910

Correct Answer: (C) 550

Q8: A constant voltage is applied between two ends of a metallic wire. If the length is halved and the radius of the wire is doubled, the rate of heat developed in the wire will be

(A) Increased 8 Times

(B) Unchanged

(C) Doubled

(D) Halved

Correct Answer: (A) Increased 8 Times

Q9: A heating element has a resistance of 100 Ω at room temperature. When it is connected to a supply of 220 V, a steady current of 2 A passes in it and the temperature is 500°C more than room temperature. What is the temperature coefficient of resistance of the heating element?

(A) 1×10– 4 °C–1

(B) 2 × 10– 4 °C–1

(C) 0.5 × 10– 4 °C–1

(D) 5 × 10– 4 °C–1

Correct Answer: (B) 2 × 10– 4 °C–1

Q10: A uniform wire of length l and radius r has a resistance of 100 Ω. It is recast into a wire of radius r/2.The resistance of new wire will be

(A) 400 Ω

(B)100 Ω

(C) 200 Ω

(D)1600 Ω

Correct Answer: (D)1600 Ω

Q11: A 2 W carbon resistor is colour coded with green, black, red and brown, respectively. The maximum current which can be passed through this resistor is

(A) 20 mA

(B) 0.4 mA

(C) 100 mA

(D) 63 mA

Correct Answer: (A) 20 mA

Q12: In a large building, there are 15 bulbs of 40 W, 5 bulbs of 100 W, 5 fans of 80 W and 1 heater of 1 kW. The voltage of the electric mains is 220 V. The minimum capacity of the main fuse of the building will be

(A) 14 A

(B) 8 A

(C) 10 A

(D) 12 A

Correct Answer: (D) 12 A

Q13: If a wire is stretched to make it 0.1% longer, its resistance will

(A) Increase By 0.05%

(B) Increase By 0.2%

(C) Decrease By 0.2%

(D) Decrease By 0.05%

Correct Answer: (B) Increase By 0.2%

Q14: A thermocouple is made from two metals, antimony and bismuth. If one junction of the couple is kept hot and the other is kept cold then, an electric current will

(A) Flow From Antimony To Bismuth At The Cold Junction

(B) Flow From Antimony To Bismuth At The Hot Junction

(C) Flow From Bismuth To Antimony At The Cold Junction

(D) Not Flow Through The Thermocouple

Correct Answer: (A) Flow From Antimony To Bismuth At The Cold Junction

Q15: The resistance of a wire is 5 ohm at 50°C and 6 ohm at 100°C. The resistance of the wire at 0°C will be

(A) 3 ohm

(B) 2 ohm

(C) 1 ohm

(D) 4 ohm

Correct Answer: (D) 4 ohm

JEE Main Current Electricity Previous Year Question Paper

Candidates can check the previous year question papers of current electricity here in the given table below.

JEE Main Current Electricity Syllabus

To adequately prepare for the exam, candidates must have a solid understanding of the current electricity topics covered in the JEE Main syllabus. It becomes difficult for students to plan their preparation without a thorough grasp. We have provided a complete syllabus for JEE main current electricity in this section to enhance the efforts of each candidate. Candidates can access the links in the table below to get the whole physics syllabus as well as the latest current electricity syllabus.

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Topic Wise Weightage of Current Electricity

Since current electricity is a crucial topic in JEE Mains exam students must know the weightage every section of current electricity has for the JEE Main exam. Experts and academicians recommended that aspirants must prepare all the topics in this section and not go for selective studies, however the focus must be on the important sections of current electricity as well. The current electricity topic wise weightage of each section is briefly mentioned in the table below.

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Important Books to Prepare for Current Electricity

Aspirants can refer to the list of important books for current electricity in this section.

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The above-mentioned importance of current electricity extends beyond JEE Mains to other competitive admission tests like JEE Advanced and GATE, among others. Professors assert that students who have a firm grasp of the fundamental ideas underlying current electricity are capable of passing not just the JEE main or advanced tests but also the GATE and numerous other admission exams held by universities and institutions. We have listed the key books for candidates in this page, along with the JEE Main current electrical questions from prior years for candidates to excel their level of preparation smoothly.