Class 12 Physics Chapter 7 important questions
Class 12 Physics Chapter 7 important questions
Practice these questions of Class 12 Physics Chapter 7 important questions to get more marks in your class 12 physics board exam.
Long Type -
1. Define alternating current, its peak value and its r.m.s. value. Derive relationship between them after evaluating the expression for rms value .
Bihar Board -2011
2.Find out an expression for root mean square value of an alternating current.
2.Find out an expression for root mean square value of an alternating current.
Bihar Board -2021
3. Discuss LCR circuit by phasor diagram.
3. Discuss LCR circuit by phasor diagram.
4. Describe the principle , construction and working of a transformer.
Bihar Board -2019
OR
Explain construction, working and uses of a transformer.
Bihar Board -2022
Short Type -
1. Define mean value and root mean square value of alternating current.
Bihar Board- 2013
2. Establish the relation between mean value and peak value of AC.
Bihar Board- 2019
3. Define inductive reactance, capacitive reactance and impedance.
4. What are reactance and impedance in alternating current circuit ?
Bihar Board- 2019
5. What do you mean by inductive reactance?
Bihar Board- 2020
OR
What is inductive reactance?
Bihar Board- 2014
6. Explain capacitive reactance?
Bihar Board- 2022
7. What is choke coil?
8. Explain the use of motor starter or choke coil.
Bihar Board- 2016
9. Why is core of transformer laminated ?
Bihar Board- 2012
10. What is transformer ? What is transformation ratio?
Bihar Board- 2014
11. What is transformer ? What do you meant its efficiency ?
Bihar Board- 2013
12. What is the use of step-up transformer?
Bihar Board- 2020
13. Name the energy losses in a transformer.
Bihar Board- 2015
14. Explain copper loss in a transformer.
Bihar Board- 2021
15. What is transformer steel ?
16. What do you mean by resonant circuit and resonant frequency?
17. Explain electrical resonance.
Bihar Board- 2021
18. What do you meant by Q-factor ?
19. What is L-C oscillation?
20. Hot wire instrument is used to measure Ac. Why?
21. What do you mean by power co-efficient?
22. What is electric power? Obtain expression for average power. 
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