Read and download free pdf of CBSE Class 12 Physics Current Electricity Worksheet Set C. Download printable Physics Class 12 Worksheets in pdf format, CBSE Class 12 Physics Chapter 3 Current Electricity Worksheet has been prepared as per the latest syllabus and exam pattern issued by CBSE, NCERT and KVS. Also download free pdf Physics Class 12 Assignments and practice them daily to get better marks in tests and exams for Class 12. Free chapter wise worksheets with answers have been designed by Class 12 teachers as per latest examination pattern
Chapter 3 Current Electricity Physics Worksheet for Class 12
Class 12 Physics students should refer to the following printable worksheet in Pdf in Class 12. This test paper with questions and solutions for Class 12 Physics will be very useful for tests and exams and help you to score better marks
Class 12 Physics Chapter 3 Current Electricity Worksheet Pdf
Current Electricity MCQ Questions with Answers Class 12 Physics Chapter 3
VERY SHORT ANSWER QUESTIONS
Question. What happens if the galvanometer and cell are interchanged at the balance point of the bridge? Would the galvanometer show any current?
Answer. No change . The galvanometer will not show any current
Question. Two wires A and B of the same material and having same length have their cross-sectional areas in the ratio 1:4. What would be the ratio of heat produced in the wires when same voltage is applied?
Answer. 𝑃=𝑉2/𝑅 since voltage is same power is inversely proportional to resistance
𝑃1/𝑃2=𝑅2/𝑅1=𝐴1/𝐴2=1:16
Question. A potential difference V is applied across a conductor of length L. How is the drift velocity affected when V is doubled and L is halved?
Answer. 𝑉 =𝑒𝜄𝑉/𝑚𝐿 and hence becomes 4 times
Question. Plot a graph showing the variation of resistance of conducting wire as a function of its radius, keeping the length of the wire and its temperature as constant
Answer. 𝑅 𝛼1/𝑟2 graph is rectangular hyperbola
Question. Two wires A and B of the same material having length in the ratio 1:2 and radii in the ratio 2:1. What is the ratio of the resistance?
Answer. 𝑅 𝛼𝐿𝐴 𝑅1𝑅2=(𝐿1𝐿2)𝑥 (𝐴2𝐴1)= 2:1
Question. Three identical cells each of emf 2V and internal resistance 0.2Ω are connected in series to an external resistor of 7.4 Ω. Calculate the current in the circuit
Answer. E effective= 6
r effective = 0.6
Total resistance 7.4+0.6=8
I = 6/8=.75A
Question. Distinguish between emf and terminal voltage
Answer. Definition given in summary
Question. Why alloys like constantan are used for making standard resistors?
Answer. Low value for temperature coefficient of resistance. Hence resistance wont vary much with change in temperature
Question. Distinguish between ohmic and non ohmic devices. Give one example each
Answer. Given in summary
(I) electric field
(ii) current density (iii) mobility of the electron
at a point on the conductor as one moves from end A to end B
Answer. 𝐸 = 𝑉 /𝐿 𝐼𝑅 /𝐿=𝐼/𝐿 (𝜌𝐿/𝐴)=𝐼𝜌/𝐴
E is proportional to 1/A hence decreases from end A to end B
J =I/A
Hence j decreases from end A to B
μ= 𝑒𝜄/𝑚 hence constant
CASE BASED QUESTIONS
1. An electric cell is source of energy that maintains a continuous flow of charge in a circuit. it changes chemical energy into electrical energy. It has two electrodes – positive and negative. Electric cell has to do some work in maintaining the current through a circuit. The work done by the cell in moving unit positive charge through the whole circuit is called the emf of the cell.
Question. When two electrodes of a cell are immersed in an electrolytic solution the charges are exchanged between
(i) Positive electrode and electrolyte only
(ii) Negative electrode and electrolyte only
(iii) Both electrodes and electrolyte
(iv) Directly between two electrodes
Answer. C
Question. The current flowing in the sell is
(i) I = E /(R+r)
(ii) I = E/R
(iii) I=E/r
(iv) I = (R+r)/E
Answer. A
Question. The maximum current that can be drawn from a cell is for
(i) R = infinity
(ii) R = finite non-zero resistance
(iii) R = 0
(iv) R =r
Answer. D
Question. When R is infinite, then potential difference V between P and N is
(i) E
(ii) 2E
(iii) E/2
(iv) E/4
Answer. A
Assertions & Reasons Questions Following questions consider two statements: one labelled as statement-1 and another as statement-2. Study both statements and mark your answer using the codes given blow.
A. Both Statement-1 and Statement-2 are true and Statement-2 is correct explanation of Statement-1.
B. Both Statement-1 and Statement-2 are true and Statement-2 is not a correct explanation of Statement-1.
C.Statement-1 is true but statement-2 is false.
D.Statement-1 is false and statement-2 is true. E. Statement-1 is false and also statement-2 is true.
Question. Statement-1 Free electrons in conductor are always in state of continuous random motion.
Statement-2 The random motion of free electrons is due to thermal energy of the conductor.
Answer. A
Question. Statement-1 Drift velocity of electrons in a conductor increase on increasing the temperature of the conductor.
Statement-2 On increasing the temperature of a conductor, resistivity of the conductor increases.
Answer. D
Question. Statement-1 For metals relaxation time for electrons decreases with increase in temperature.
Statement-2 With the increase in temperature, number of collision per unit time that electrons made with lattice ion also increases.
Answer. B
Question. Statement-1 Fuse wire has high resistance and low melting point.
Statement-2 Fuse wire is for small current flow only.
Answer. C
Question. Statement-1 Power rating of resistance is not so important when used in a circuit.
Statement-2 The resistance value changes with temperature.
Answer. B
Question. Statement-1 After a long use, a potentiometer is declared to be less sensitive
Statement-2. The potential gradient of a potentiometer depends on the area of cross section of the wire used.
Answer. A
Question. Statement-1 In meter bridge experiment, a high resistance is always connected in series with a galvanometer.
Statement-2 As resistance increases current through the circuit increases.
Answer. C
Question. Statement-1 In a balanced Wheatstone’s bridge no current runs across the galvanometer.
Statement-2. The terminals of the path across which the galvanometer is connected are at the same potential.
Answer. A
Question. Statement-1 Kirchhoff’s junction law follows from conservation of charge.
Statement-2. Kirchhoff’s loop law follows from conservative nature of electric field.
Answer. B
Please click on below link to download CBSE Class 12 Physics Current Electricity Worksheet Set C
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CBSE Class 12 Physics Chapter 3 Current Electricity Worksheet
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Worksheet for Physics CBSE Class 12 Chapter 3 Current Electricity
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Chapter 3 Current Electricity worksheet Physics CBSE Class 12
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Chapter 3 Current Electricity CBSE Class 12 Physics Worksheet
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Worksheet for CBSE Physics Class 12 Chapter 3 Current Electricity
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