Class 12 Physics Important Questions | Chapter 9 Current Electricity

Here we have a given Class 12 Physics Important Questions for Maharashtra Board HSC Examination 2023. Every students want to score good marks in Class 12 Board Exam,but number of students don't know how to score good marks. Dear students, given following questions had been asked in earlier HSC Board Examinations. From this post, you will know which type of questions had been asked in earlier Board Exams and same questions or same type of questions will be asked in your upcoming examination. If you study all these questions, you will get very good marks in your board examinations, Because so many questions from the following given questions will be asked in your upcoming examination.Therefore go through our Class 12 Physics Important Questions which are given in chapter-wise manner and simply try to solve these questions to score very good marks in Physics and obviously, you will! Best wishes to all dear students for your upcoming Maharashtra State Board Exam 2023.

यहां हमारे पास महाराष्ट्र बोर्ड HSC परीक्षा 2023 के लिए कक्षा 12वीं के Physics के महत्वपूर्ण प्रश्न दिए गए हैं। प्रत्येक छात्र कक्षा 12वीं की बोर्ड परीक्षा में अच्छे अंक प्राप्त करना चाहते हैं, लेकिन कई छात्र यह नहीं जानते कि अच्छे अंक कैसे प्राप्त करें। प्रिय छात्रों, नीचे दिए गए प्रश्न पिछले एचएससी बोर्ड परीक्षाओं में पूछे गए थे। इस पोस्ट से आप जानेंगे कि पिछली बोर्ड परीक्षाओं में किस प्रकार के प्रश्न पूछे गए थे और आपकी आगामी परीक्षा में भी इसी प्रकार के प्रश्न पूछे जाएंगे। यदि आप इन सभी प्रश्नों का अध्ययन करते हैं, तो आप अपनी बोर्ड परीक्षाओं में बहुत अच्छे अंक प्राप्त करेंगे, क्योंकि निम्नलिखित दिए गए प्रश्नों में से बहुत सारे प्रश्न आपकी आगामी परीक्षा में पूछे जाएंगे। इसलिए हमारे कक्षा 12 के भौतिकी के महत्वपूर्ण प्रश्नों को देखें जो अध्याय में दिए गए हैं | फिजिक्स में बहुत अच्छे अंक प्राप्त करने के लिए इन प्रश्नों को बुद्धिमान तरीके से हल करने का प्रयास करें और जाहिर है, आप करेंगे! सभी प्रिय छात्रों को आपकी आगामी महाराष्ट्र राज्य बोर्ड परीक्षा 2023 के लिए शुभकामनाएं।


Class 12 Physics Important Questions

Class 12 Physics Important Questions | Chapter 9 Current Electricity

• Explain how a moving coil galvanometer is converted into an ammeter. Derive the necessary formula. (March 2012)

• In a potentiometer the balancing length of the wire is found to be 2.5 m for a cell of e.m.f. 1.5 V. Find the balancing length of the wire for another cell of e.m.f. 1.2 V on the same potentiometer. (March 2012, July 2018)

• Draw neat labelled circuit diagram to determine internal of cell by using resistance of potentiometer. (March 2013)

• A cell balances against a length of 200 cm on a potentiometer wire when it is shunted by a resistance of 8 ohm. The balancing length reduces by 40 cm when it is shunted by a resistance of 4 ohm. Calculate the balancing length when the cell is in open circuit. Also calculate the internal resistance of the cell. (March 2013)

• State and explain principle of potentiometer. (Oct 2013)

• A galvanometer has a resistance of 16 ohm. It shows full scale deflection when a current of 20 mA is passed through it. The only shunt resistance available is 0.06 ohm which is not appropriate to convert a galvanometer into an ammeter. How much resistance should be connected in series with the coil of galvanometer so that the range of ammeter is 8 A? (Oct 2013)

• Four resistances 4 ohm, 8 ohm X ohm and 6 ohm are connected in a series so as to form Wheatstone's network. If the network is balanced, find the value of 'X'. (Oct 2013)

• Two diametrically opposite points of a metal ring are connected to two terminals of the left gap or metrebridge. The resistance of 11 ohm is connected in right gap. If null point is obtained at a distance of 45 cm from the left end, find the resistance of metal ring. (March 2014)

• A potentiometer wire has a length of 4 m and a resistance of 5 ohm. What resistance should be connected in series with a potentiometer wire and a cell of e.m.f. 2 V having internal resistance 1 ohm to get a potential gradient of 10-3 V/cm? (Oct 2014)


• Resistance of a potentiometer wire is 0.1 ohm/cm. A cell of e.m.f. 1.5 V is balanced at 300 cm on this potentiometer wire. Calculate the current and balancing length for another cell of e.m.f. 1.4 V on the same potentiometer wire. (March 2015)

• State any two possible sources of errors in metrebridge experiment. How can they be minimised? (Oct 2015)

• A potentiometer wire has a resistance per unit length of 0.1 ohm/m. A cell of e.m.f. 1.5 V balances against 300 cm length of the wire. Find the current through potentiometer wire. (Oct 2015)

• Describe Kelvin's method to determine the resistance of a galvanometer by using a metrebridge. (March 2016)

• The combined resistance of a galvanometer of resistance 500 ohm and its shunt is 21 ohm. Calculate the value of shunt. (March 2016)

• A moving coil galvanometer has a resistance of 25 ohm and gives a full scale deflection for a current of 10 mA. How will you convert it into a voltmeter having range 0 - 100 V? (July 2016)

• A voltmeter has a resistance of 100 ohm. What will be its reading when it is connected across a cell of e.m.f. 2 V and internal resistance 20 ohm. (July 2016)

• A potentiometer wire has a length of 2 m and resistance of 10 ohm. It is connected in series with resistance 990 ohm and a cell of e.m.f. 2 V. Calculate the potential gradient along the wire. (July 2016)

• State the advantages of potentiometer over voltmeter. (March 2017)

• An unknown resistance is placed in the left gap and resistance of 50 ohm is placed in the right gap of a metrebridge. The null point is obtained at 40 cm from the left end. Determine the unknown resistance. (March 2017)

• Explain how moving coil galvanometer is converted into a voltmeter. Derive the necessary formula. (March 2017)

• When a resistance of 12 ohm is connected across a cell, its terminal potential difference is balanced by 120 cm length of potentiometer wire. When the resistance of 18 ohm is connected across the same cell, the balancing length is 150 cm. Find the balancing length when the cell is in open circuit. Also calculate the internal resistance of the cell. (July 2017)

• Explain with neat circuit diagram, how will you determine the unknown resistance X by using a metrebridge experiment. (March 2018)

• When a resistor of 5 ohm is connected across the cell, its terminal potential difference is balanced by 150 cm of potentiometer wire and when a resistance of 10 ohm is connected across the cell, the terminal potential difference is balanced by 175 cm of the same potentiometer wire. Find the balancing length when the cell is in open circuit and the internal resistance of the cell. (March 2019)

• State Kirchhoff's second law for a closed circuit. How will you minimize the errors in Kelvin's method? (July 2019)

• Two resistances X and Y in the two gaps of a metrebridge gives a null point dividing the wire in the ratio 2:3. If each resistance is increased by 30 ohm, the null point divides the wire in the ratio 5:6, Calculate the value of X and Y. (March 2020)


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