Class 12 Physics · Chapter 5 · Test 2
Impedance, RC and RL
43 MCQs
43 questions · 35 min · 43 marks
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Sample questions
The first 5 of 43. Try each one, then tap to see the answer.
Question 1
An inductor (coil or choke) is a component with:
- ALarge resistance and no inductance
- BLarge self-inductance and negligible resistance
- CZero self-inductance
- DOnly capacitance
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Answer: B
An inductor has a large self-inductance and negligible resistance and stores energy in a magnetic field.
Question 2
In an AC circuit containing only an inductor the current:
- ALeads the voltage by 90°
- BIs in phase with the voltage
- CLags behind the voltage by 90°
- DLags behind the voltage by 180°
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Answer: C
The voltage across the inductor leads the current by 90° (π/2).
Question 3
The inductive reactance of an inductor is:
- AXL = 1/2πfL
- BXL = 2πfL
- CXL = L/2πf
- DXL = f/L
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Answer: B
XL = ωL = 2πfL.
Question 4
For direct current (f = 0) the inductive reactance is:
- AInfinite
- BEqual to R
- CZero
- DEqual to 1 Ω
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Answer: C
XL = 2πfL = 0 for DC.
Question 5
An inductor:
- ABlocks DC and allows AC
- BAllows DC and blocks AC (more at high frequency)
- CBlocks both DC and AC
- DAllows both equally
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Answer: B
XL is zero for DC and large at high frequency so it passes DC but opposes AC.
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