Chapter 2: Mechanical Properties of fluids
Chapter 3: Kinetic Theory of gases and Radiation
Chapter 4: Thermodynamics
Chapter 5: Oscillations
Chapter 6: Superposition of Waves
Chapter 7: Wave Optics
Chapter 8: Electrostatics
Chapter 9: Current Electricity
Chapter 10: Magnetic Effect of Electric Current
Chapter 11: Magnetic materials
Chapter 12: Electromagnetic Induction
Chapter 13: AC Circuits
Chapter 14: Dual Nature Of Radiation And Matter
Chapter 15: Structure of Atoms and Nuclei
Chapter 16: Semiconductors Devices
Chapter 9: Current Electricity
SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 9 Current Electricity MCQ’S
1 Mark Each
Kirchhoff’s second law (voltage law) is based on ______
conservation of charge
conservation of mass
conservation of energy
conservation of momentum
When unknown resistance is determined by meter bridge, the error due to contact resistance is minimised by ______
connecting both the resistances only in one gap
interchanging the position of known and unknown resistances
using uniform wire
obtaining the null point near the ends of the wire
The SI unit of the potential gradient is ______
The instrument which can measure terminal potential difference as well as electromotive force (emf) is ______
Wheatstone’s meter bridge
When the null point is obtained in the potentiometer, the current is drawn from the ______
both main and cell battery
neither main nor cell battery
If the potential gradient of a wire decreases, then its length ______
none of the above
Four resistances 4 Ω,8Ω, XΩ and 12Ω are connected in a series to form Wheatstone’s network. If the network is balanced, the value of X is ______
SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 9 Current Electricity Very Short Answer
1 Mark Each
State Kirchhoff’s first (current) law.
State Kirchhoff’s second (voltage) law.
What is the basis of Kirchhoff’s current law and voltage law?
Are Kirchhoff’s laws applicable to both AC and DC circuits?
Define Potential Gradient.
On what factors does the potential gradient of the wire depend?
What is the SI unit of potential gradient?
State any one use of a potentiometer.
A voltmeter has a resistance of 100 Ω. What will be its reading when it is connected across a cell of emf 6 V and internal resistance 20 Ω?
In a meter bridge, two unknown resistances R and S, when connected between the two gaps, give a null point is 60 cm from one end. What is the ratio of R and S?
SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 9 Current Electricity Short Answer I
2 Marks Each
What are the disadvantages of a potentiometer over a voltmeter?
Distinguish between a potentiometer and a voltmeter.
Distinguish between an ammeter and a voltmeter.
How do you calculate the shunt required to increase the length small n times?
Define: electrical circuit
Calculate the value of the shunt resistance when connected across a galvanometer of resistance 18Ω will allow 1/10 th of the current to pass through the galvanometer.
Four resistances 6Ω, 6Ω, 6Ω and 18Ω form a Wheatstone bridge. Find the resistance which connected across the 18Ω resistance will balance the network.
The maximum safe voltage that can be measured using a galvanometer of resistance G is Vm . Find the resistance to be connected in series with the galvanometer so that it becomes a voltmeter of range nVm.
SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 9 Current Electricity Short Answer II
3 Marks Each
Explain with a neat circuit diagram. How you will determine the unknown resistances using a meter bridge.
State any two sources of errors in the meter-bridge experiment. Explain how they can be minimized.
What is a potential gradient? How is it measured? Explain.
Describe how a potentiometer is used to compare the EMFs of two cells by connecting the cells individually.
A cell of e.m.f 1.5V and negligible internal resistance is connected in series with a potential meter of length 10 m and the total resistance of 20 Ω. What resistance should be introduced in the resistance box such that the potential drop across the potentiometer is one microvolt per cm of the wire?
In a meter bridge, the balance point is found to be at 39.5 cm from the end A when the resistor R is 12.5 Ω (right gap).
a) Determine the resistance of X (left gap).
b) Determine the balance point of the bridge if X and R are interchanged?
c) What happens if the galvanometer and cell are interchanged at the balance point of the bridge?
The emf of a standard cell is 1.5V and is balanced by a length of 300 cm of a potentiometer with a 10 m long wire. Find the percentage error in a voltmeter that balances at 350 cm when its reading is 1.8 V.
SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 Chapter 9 Current Electricity Long Answer
4 Marks Each
Describe with the help of a neat circuit diagram how you will determine the internal resistance of a cell by using a potentiometer. Derive the necessary formula.
Describe how a potentiometer is used to compare the emf's of two cells by the combination method.
State the uses of a potentiometer.
Why is a potentiometer preferred over a voltmeter for measuring emf?
Chapter 9: Current Electricity
SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 chapter 9 - Current Electricity
SCERT Maharashtra Question Bank solutions for 12th Standard HSC Physics Maharashtra State Board 2021 chapter 9 (Current Electricity) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board 12th Standard HSC Physics Maharashtra State Board 2021 solutions in a manner that help students grasp basic concepts better and faster.
Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. SCERT Maharashtra Question Bank textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.
Concepts covered in 12th Standard HSC Physics Maharashtra State Board 2021 chapter 9 Current Electricity are Current Electricity, Kirchhoff’s Laws of Electrical Network, Wheatstone Bridge, Potentiometer, Galvanometer.
Using SCERT Maharashtra Question Bank 12th Board Exam solutions Current Electricity exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in SCERT Maharashtra Question Bank Solutions are important questions that can be asked in the final exam. Maximum students of Maharashtra State Board 12th Board Exam prefer SCERT Maharashtra Question Bank Textbook Solutions to score more in exam.
Get the free view of chapter 9 Current Electricity 12th Board Exam extra questions for 12th Standard HSC Physics Maharashtra State Board 2021 and can use Shaalaa.com to keep it handy for your exam preparation