JAC 12th Physics Ch 7 Important Questions 2024 Alternating Current

JAC 12th Physics Ch 7 Important Questions 2024 Alternating Current : झारखण्ड बोर्ड कक्षा 12th सभी विद्यार्थियों के लिए Physics Unit 4. में Chapter 7 Alternating Current (AC) के पिछले वर्षो में जो भी प्रश्न पूछे गए हैं, उनकी चर्चा हम इसमें करेंगे तो इन Important Questions को पढ़ लीजिए.

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 2024 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 2024 में अच्छे अंक प्राप्त कर सकते हो.

यदि आप ऐसे ही सभी विषयों के Chapterwise Important 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.

JAC 12th Physics Ch 7 Important Questions 2024 – Overview

🏢Name of the Organization	Jharkhand Academic Council, Ranchi
🗂️Category	Physics
✍️Years	2006-2023
👨‍🎓Class	12th
📋Exam Mode	Offline
📒Stream	Science
📑Subject	Physics
📝Chapter	7. Alternating Current
🌐official website	jac.jharkhand.gov.in
💖Telegram	join us

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JAC 12th Physics Previous Years Important Questions –

Q1. Distinguish between resistance, reactance and impedance of an AC circuits(2006)
Q2. Explain the working principle of AC generator. (2007)
Q3. A series LCR circuit with R =25ohm , L=1.5H and C= 30 μF is connected to a variable frequency 220V a.c. supply. What is the average power transferred to the circuit in one complete cycle when the frequency of the supply equals the natural frequency of the circuit? (2007)
Q4. Obtain an expression for power in a.c. circuits. What will be the power consumed in a pure inductor? (2008)

Q5. Obtain expression for the impedance of a series LCR circuit. (2008)
Q6. The equation of an alternating current is I=20Sin300πt . Calculate the frequency and rms value of current. (2010)
Q7. An a.c. source of frequency 50Hz is connected to a 50mH inductor and a bulb. The bulb glows with some brightness. Calculate the capacitance of the capacitor to be connected in series with the circuit, so the bulb glows with maximum brightness. (2011)
Q8. A circuit containing 80mH inductor, 60 μF capacitor and 15 ohm resistor connected to a 230V , 50Hz supply. Obtain average power transferred to each element or circuit and total power absorbed . (2012)

Q9. In LCR circuit the voltage across each component of L, C and R is 50 V. The voltage across LC combination will be -(2012)
a. 50V
b. 50 √2 V
c. 100V
d. 0V
Q10. An emf of 230 V with frequency 50Hz is applied to a circuit containing a capacitor of capacitance 5uF in series with a resistance of 1000 ohm. Find the rate at which energy (power) is dissipated in a circuit. (2013)
Q11. Give expressions for reactance of an inductance and a capacitance. How do they vary with applied frequency? (2014)
Q12. The phase difference between current and voltage in an A.C. circuit containing capacitance only is-(2015)
a. 0°
b. 90°
c. 180°
d. 45°

Q13. What do you mean by reactance and impedance in AC circuit prove that the average power dissipated in an AC circuit containing inductance only is zero. What a choke coil? (2015)
Q14. Derive an expression for instantaneous current in a series LCR circuit if connected to an alternating EMF. Obtain the condition for resonance. (2016)
Q15. The ratio of root mean square value and peak value office alternating current is-(2016)
a. 1/√2
b. √2
c. 1/2
d. 2√2

Q16. If f be the phase difference between alternating current and EMF then power factor is [2017]
(a) tan ϕ
(b) cos²ϕ
(c) sin ϕ
(d) cosϕ

Q17. In a step up Transformer the number of turns in the primary and secondary coils are respectively N₁ and N₂ then- (2017)
a. N₁>N₂
b. N₁<N₂
c. N₁=N₂
d. N₁=0
Q18. The equation of an alternating current I = 20sin 200πt. Calculate frequency, peak value and rms value of current. (2017)

Q19. A 60μF capacitor is connected to a 110V , 60 Hz a.c supply. Determine the root mean square value of the current in the circuit. (2018, 2022)
Q20. Define reactance and impedance in AC circuit. Derive expression for instantaneous current in series LCR circuit if connected to a alternating EMF. (2019)

Q21. Derive an expression for average or mean value of alternating current for half cycle. (2020, 2022)
Q22. Derive an expression for RMS value of alternating current for one full cycle.(2020, 2022)

Q23. Define inductive reactance(X_L) [2022]

Class 12th Physics Important Questions chapterwise list :

Units	Physics	Important Questions
1.	1. Electric Charges and Fields	Click Here
	2. Electric Potential and Capacitance	Click Here
2.	3. Electric current	Click Here
3.	4. Moving Charges and Magnetism 5. Magnetism and Matter	Click Here
4.	6. Electromagnetic Induction	Click Here
	7. Alternating Current	Click Here
5.	8. Electromagnetic Waves	Click Here
6.	9. Ray Optics	coming soon
	10. wave Optics	coming soon
7.	11. Dual Nature of Radiation and Matter	Coming Soon
8.	12. Atoms 13. Nuclei	Click Here
9.	14. Semiconductors	Coming Soon
10.	15. Communication	Coming Soon

Important Links :

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