Please refer to CBSE Class 12 Physics HOTs Current Electricity. Download HOTS questions and answers for Class 12 Physics. Read CBSE Class 12 Physics HOTs for Chapter 3 Current Electricity below and download in pdf. High Order Thinking Skills questions come in exams for Physics in Class 12 and if prepared properly can help you to score more marks. You can refer to more chapter wise Class 12 Physics HOTS Questions with solutions and also get latest topic wise important study material as per NCERT book for Class 12 Physics and all other subjects for free on Studiestoday designed as per latest CBSE, NCERT and KVS syllabus and pattern for Class 12
Chapter 3 Current Electricity Class 12 Physics HOTS
Class 12 Physics students should refer to the following high order thinking skills questions with answers for Chapter 3 Current Electricity in Class 12. These HOTS questions with answers for Class 12 Physics will come in exams and help you to score good marks
HOTS Questions Chapter 3 Current Electricity Class 12 Physics with Answers
ONE MARK QUESTIONS
Question. Define the terms conductivity of a conductor?On what factors do it depend?
Answer : Conductivity is the reciprocal of resistivity,It depends upon no density of electrons and Average relaxation time.
Question. V – I graph for a metallic wire at two different temperatures T1 and T2 is as shown in the figure. Which of the two temperatures is higher and why?
Answer : For metallic wire R=V/I increases with temperature, hence T1 will be higher.
Question. A 10 V battery of negligible internal resistance is connected across a 200 V battery and a resistance as shown in the figure find the value of current in the circuit.
Answer : I=200-10/38=190/38=5Amp.
Question. When electrons drift in a metal from lower to higher potential, does it mean that all the free electrons of the metal are moving in the same direction?
Answer : No, Maximum no of electrons will drift opposite to the direction of higher potential
Question. Show on a graph the variation of resistivity with temperature for a typical semiconductor?
Question. Two metallic resistors are connected first in series and then in parallel across a d.c. supply. Plot of I – V graph is shown for the two cases. Which one represents a parallel combination of the resistors and why?
Answer : In parallel combination less resistance will be the equivalent resistance, therefore A will represent parallel combination.
TWO MARKS QUESTIONS
Question. Calculate the current drawn from the battery by the network of resistors shown in figure
Answer : As the circuit is similar to a whaetstone bridge 5 Ω resistor can be removed ,then R=2Ω
Hence i=2 amp.
Question. Using the concept of drift velocity of charge carriers in a conductor, deduce the relationship between current density and resistivity of the conductor.
Answer : j= I/A = n e V d j =σ E =1/ρE
Question. A variable resistor R is connected across a cell of emf E and internal resistance r as shown in the figure. Draw a plot showing the variation of (i) terminal voltage V and (ii) the current I, as a function of R. (Image 4)
Question. Two electric bulbs P and Q have their resistances in the ratio of 1: 2. They are connected in series across a battery. Find the ratio of the power dissipation in these bulbs.
Answer : P = V2/R hence the ratio will be 2:1
THREE MARKS QUESTIONS
Question. A 16 Ω resistance wire is bent to form a square. A source of emf 9 V is connected across one of its sides as shown. Calculate the current drawn from the source. Find the potential difference between the ends C and D.
If now the wire is stretched uniformly to double the length and once again the same cell is connected in the same way, across one side of the square formed, what will now be the potential difference across one of its diagonals?
Question. A cell of emf ‘E’ and internal resistance ‘r’ is connected across a variable load resistor R. Draw the plots of the terminal voltage V versus (i) R and (ii) the current I.
It is found that when R = 4 , the current is 1 A and when R is increased to 9 , the current reduces to 0.5 A. Find the values of the emf E and internal resistance r.
Answer : E=1(4+r)=0.5(9+r), Solving r=1Ω,E=5V
Question. A potential difference V is applied across a conductor of length L and diameter D. How is the drift velocity, Vd, of charge carriers in the conductor affected when (i) V is halved, (ii) L is doubled and (iii) D is halved? Justify your answer in each case.
Answer : Drift velocity halved
Drift velocity halved
Drift velocity halved
Question. A resistance R draws current from a potentiometer, the potentiometer AB, has a total resistance R, a voltage V is applied to the potentiometer.
Derive an expression for the voltage across R when the sliding contact is in the middle of potentiometer wire.
Answer : Vac=2VR/4R+Ro
FIVE MARKS QUESTIONS
Question. Use Kirchhoff’s rules , calculate the current in the arm AC of the given circuit
On what principle does the meter bridge work? Why are the metal strips used in the bridge?
Answer : I1 = -12/13 A
I2 = -8/13 A
I1+ I2 = -8/13 + -12/13=-20/13A
Question. In the figure a long uniform potentiometer wire AB is having a constant potential gradient along its length. The null points for the two primary cells of emfs E1and E2 connected in the manner shown are obtained at a distance of 120 cm and 300 cm from the end A.
Find E1 / E2 and position ofnull point for the cell E1.
How is the sensitivity of a potentiometer increased?
Answer : 7/3,
Question. Draw a circuit diagram of a potentiometer .State its working principle. Derive the necessary formula to describe how it is used to compare the emfs of the two cells.
Write two possible causes for one sided deflection in a potentiometer experiment.
Answer : E1/E2 = l1/l2 (derive it)
The emf of the driver cell may be less than the secondary cell
Very high resistance connected in series with the drver cell circuit
One mark questions
1. Magnesium is used for making standard resistors, why?
2. The sequence of bands marked on a carbon resistor are: Red, Red, Red, Silver. Write the value of resistance with tolerance.
3. A wire of resistively ρ is stretched to three its initial length, what will be its new resistively.
4. If p.d.v applied across a conductor is increased to 2v, how will the draft velocity of the electrons change?
5. A 10Ω thick wire is stretched so that its length becomes three times. Assuming thatthere is no change in its density on stretching. Calculate the resistance of new wire.
6. You are given 8 Ω resistor. What length of wire of resistance 120 Ωm-1 should be joined in parallel with it to get a value of 6 Ω ?
7. Three resistance 3Ω,6Ω and 9Ω are connected to a battery. In which of them will the powerdissipation be maximum if
a) They are all connected in parallel
b) They are all connected in series Give reason.
8. A silver wire has a resistance of 2.1Ω at 27.5˚c and a resistance of 2.7Ω at 100˚c. determine the temperature coeff. of resistivity of silver.
9. Give any two applications super conductors.
10. Two wire of equal length one copper and manganin have same resistance , which wire is thicker?.
11. Why manganin is used for making standard resistor?
12. A copper wire of resistivity r is stretched to reduce its diameter to half of its previous value .What will be the new resistances?
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CBSE Class 12 Physics Chapter 3 Current Electricity HOTS
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HOTS for Physics CBSE Class 12 Chapter 3 Current Electricity
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Chapter 3 Current Electricity HOTS Physics CBSE Class 12
All HOTS given above for Class 12 Physics have been made as per the latest syllabus and books issued for the current academic year. The students of Class 12 can refer to the answers which have been also provided by our teachers for all HOTS of Physics so that you are able to solve the questions and then compare your answers with the solutions provided by us. We have also provided lot of MCQ questions for Class 12 Physics in the HOTS so that you can solve questions relating to all topics given in each chapter. All study material for Class 12 Physics students have been given on studiestoday.
Chapter 3 Current Electricity CBSE Class 12 HOTS Physics
Regular HOTS practice helps to gain more practice in solving questions to obtain a more comprehensive understanding of Chapter 3 Current Electricity concepts. HOTS play an important role in developing an understanding of Chapter 3 Current Electricity in CBSE Class 12. Students can download and save or print all the HOTS, printable assignments, and practice sheets of the above chapter in Class 12 Physics in Pdf format from studiestoday. You can print or read them online on your computer or mobile or any other device. After solving these you should also refer to Class 12 Physics MCQ Test for the same chapter
CBSE HOTS Physics Class 12 Chapter 3 Current Electricity
CBSE Class 12 Physics best textbooks have been used for writing the problems given in the above HOTS. If you have tests coming up then you should revise all concepts relating to Chapter 3 Current Electricity and then take out print of the above HOTS and attempt all problems. We have also provided a lot of other HOTS for Class 12 Physics which you can use to further make yourself better in Physics.
You can download the CBSE HOTS for Class 12 Physics Chapter 3 Current Electricity for latest session from StudiesToday.com
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HOTS stands for "Higher Order Thinking Skills" in Chapter 3 Current Electricity Class 12 Physics. It refers to questions that require critical thinking, analysis, and application of knowledge
Regular revision of HOTS given on studiestoday for Class 12 subject Physics Chapter 3 Current Electricity can help you to score better marks in exams
Yes, HOTS questions are important for Chapter 3 Current Electricity Class 12 Physics exams as it helps to assess your ability to think critically, apply concepts, and display understanding of the subject.