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JAC 12th Physics Important Questions 2023[Ch.3]

JAC 12th Physics Important Questions 2023 [Ch.3] Exam: झारखण्ड बोर्ड कक्षा 12th सभी विद्यार्थियों के लिए Physics Chapter 3. Electric Current पिछले वर्षो में जो भी प्रश्न पूछे गए हैं, उनकी चर्चा हम इसमें करेंगे इनमें हम Subjective Questions तथा Objective Questions को देखेंगे तो इन Important Questions को पढ़ लीजिए.

JAC 12th Physics Important Questions 2023[Ch.3]
JAC 12th Physics Important Questions 2023 [Ch.3]

रांची: झारखंड एकेडमिक काउंसिल ( JAC Board) कक्षा JAC 12th Physics Important Question के पिछले वर्षों के सभी महत्वपूर्ण प्रश्न (important Questions) आपको यहाँ पर बताए जा रहे है, जो बोर्ड परीक्षा 2023 के लिए बहुत महत्वपूर्ण है. अगर आप इन सभी प्रश्नों को याद कर लेते हो तो अवश्य ही आप JAC Board class 12th Physics exam 2023 में अच्छे अंक प्राप्त कर सकते हो.यदि आप ऐसे ही सभी विषयों के Chapterwise Questions उत्तर चाहते हैं तो हमारे वेबसाइट www.jharkhandlab.com से जुड़े रहे.

विद्यार्थी इसका उत्तर स्वयं करें। ये सारे प्रश्न आपके परीक्षा (JAC 12th Physics Important Question For Board Exams)में बार – बार पूछे जा रहे है। इसमें आपको सभी chapter का अलग-अलग पिछले 16 से 17 वर्षों के महत्वपूर्ण प्रश्न मिलेंगे। यानि 2006-2022 इसमें आपको ये भी बताया जा रहा है कि कौन से प्रश्न किस तरह से एवं कितने marks के पूछे  जा रहें है।

यदि वैसे छात्र छात्राएं जो प्रश्नों के उत्तर नहीं कर पाते हैं, वो कुछ दिन प्रतीक्षा करें. आप यहाँ से Questions-answers डाउनलोड कर सकते हैं.

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JAC 12th Physics Previous Years Important Questions-

Q1. State and explain Kirchhoff’s rules. (3 Marks) [JAC-2006]
Q2. If two resistors are connected in series , the equivalent resistance becomes 8Ω. If the same are connnected in parallel , the equivalent resistance is 1.5Ω.Find individual resistance . (3 Marks) [JAC-2006]
Q3. What is the si unit of resistivity? (1 Marks)[JAC-2007]
Q4. What are kirchhoff’s rules for an electrical circuit ? Apply the rules to obtain the condition of a wheatstone bridge. (5 Marks) [JAC-2007]


Q5. . If two resistors are connected in series , the equivalent resistance becomes 16Ω. If the same are connnected in parallel , the equivalent resistance is 3Ω.Find individual resistance . (3 Marks) [JAC-2008]
Q6. How resistance of a resistor depends on its temperature? (2 Marks)[JAC-2009]
Q7. What do you unfderstand by driift velocity and mobility? (2 Marks) [JAC-2009, 2013]
Q8. If two resistors are connected in series , the equivalent resistance becomes 18Ω. If the same are connnected in parallel , the equivalent resistance is 4Ω. Find individual resistance . (3 Marks) [JAC-2009]


Q9. Define electric current. (1 Marks) [JAC-2010]
Q10. State Ohm’s law and derive the relation 𝐽 = 𝜎𝐸. (5 Marks) [JAC-2010, 2012]
Q11. When is a wheatstone bridge is most sensitive? (1 Marks) [JAC-2011]
Q12. What is drift velocity ? What is relation between drift velocity and current? (2 Marks) [JAC-2011]
Q13. Define EMF of a cell. (2 Marks) [JAC-2012]


Q14. Explain with the help of circuit diagram how the value of can be determined by using a wheatstone bridge? Derived formula used. (5 Marks) [JAC-2012]
Q15. Show that in parallel grouping of a number of cell the value of current will be same as that due to a single cell when internal resistance of cell negligible in comparison to external resistance in circuit. (2 Marks)[JAC-2013]
Q16. Calculate the equivalent resistance of the network between x and y. (3 marks)[JAC-2013]

JAC 12th Physics Important Questions 2023[Ch.3]
JAC 12th Physics Important Questions 2023[Ch.3] 1

Q17. As temperature increases , the resistance of a conductor : (1 marks) [JAC 2014]
a) increases
b) deceases
c) remain constant
d) depends upon conductor
Q18. Write formula for equivalent resistance for the combination of resistance in
a) series,
b) parallel. (1+1=2 marks) [JAC –2014]
Q19. What is Kichhoff’s point (junction) rule for electric network? If equivalent resistance between P and Q is 10Ω, find R. (1+2=3 Marks) [JAC –2014]
Q20. What is drift velocity ? Establish Ohm’s law for conductors using idea of drift velocity. (3 Marks) [JAC –2015]


Q21. Define EMF of a cell. Mention two differences between emf and potential differences. (2 marks) [JAC- 2016]
Q22. As temperature increases , the resistance of a conductor :- (1 marks) [JAC –2017]
a) remain unchanged
b) increases
c) decreases
d) none of these
Q23. Two cells of emf E1 and E2 and internal resistance r1and r2 respectively are connected in parallel. Equivalent emf of the combination is – (1 Marks) [JAC –2017]
a) 𝐸1 𝑟2+𝐸2 𝑟1 /𝑟1+𝑟2
b) 𝐸1𝑟1+𝐸2𝑟2 /𝑟1+𝑟2
c) 𝐸1 + 𝐸2/2
d) 𝐸1 + 𝐸2


Q24. Define drift velocity and derived an expression for it. Deduce Ohm’s law using the concept of drift velocity. (5 marks) [JAC –2017]

Q25. 1 kilowat-hour (Kwh) is equal to
(1 marks) [JAC –2018]
a) 3.6 × 106 𝐽
b) 3.6 × 1010𝐽
c) 6.3 × 106 𝐽
d) 6.3 × 1010𝐽
Q26. For a conductor the relation between current density (𝐽 ), conductivity(𝜎)and electric field intensity(𝐸) :-
(1 marks) [JAC –2018]
a) 𝐽 = 𝜎𝐸
b) 𝑗 =𝜎𝐸
c) 𝐽 = 𝐸𝜎
d) None of these
Q27. Define internal resistance of a cell. State two factors on which it depends. (2 marks) [JAC –2018]

Q28. Explain with circuit daigram the parallel combination of identical cell obtain the condition for maximum current in external resistance connected with the combination.
(3 marks) [JAC –2018]
Q29. If a uniform wire of resistance of 16Ω is cut into four equal parts and attached in parallel combination, the equivalent resistance is – (1 marks) [JAC –2020]
a) 1Ω
b) 4Ω
c) 1/4Ω
d) 1/16Ω
Q30. Kirchhoff’s point rule is a direct consequence of law of conservation of – (1 marks) [JAC –2020]
a) Energy
b) Linear momentum
c) Angular momentum
d) Charges

Q31. What are the factors on which the resistance of a conductor depends ? Give the corresponding relation.(2 marks) [JAC –2020]

2022 1st term Previous Years Objective Questions-

Q32. Ohm’s law is valid when the temperature of conductor is –
a. Very law
b. Very high
c. Varying
d. Constant

Q33. Why is the wheatstone bridge more accurate than other methods of measuring resistances?
a. It is null method
b. It is based on Kirchhoff’s laws
c. It has four resistance
d. It does not involved Ohm’s law

Q34. Drift velocity Vd varies with the intensity of electric field as per the relation
a. Vd α E²
b. Vd α 1/E
c. Vd α √E
d. Vd α E
Q34. Kirchhoff’s loop roll is based on the conservation of
a. Mass
b. Charge
c. Energy
d. None of these


Q35. In this series combination of two or more than two resistances
a. The current through each resistance is same
b. The voltage through each resistance is same
c. Neither current nor Voltage through each resistance is same
d. Both current and voltage through each resistance are same.
Q36. In parallel combination of n cells, we obtain
a. more voltage
b. more electric current
c. less voltage
d. less electric current


Q37. Activity of alloy manganin-
a. Is nearly independent of temperature
b. Increases rapidly with increase in temperature
c. Decreases with increase in temperature
d. Increases rapidly with decrease in temperature
Q38. 6.4A current age of flowing in a conductor then the number of electrons flowing per second will be –
a. 4×10^19
b. 3× 10^19
c. 2×10^-20
d. 2.5 × 10^-20

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