21. Which component is used to store electrical charge?
a) Inductor
b) Capacitor
c) Resistor
d) Transformer
Answer: b) Capacitor
22. What is the basic unit of capacitance?
a) Ampere
b) Ohm
c) Volt
d) Farad
Answer: d) Farad
23. What is the formula for capacitance?
a) C = Q/V
b) C = V/Q
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c) C = Q^2/V
d) C = V^2/Q
Answer: a) C = Q/V
24. What is the symbol for an inductor in a circuit diagram?
a) Straight line
b) Zigzag line
c) Circle
d) Arrow
Answer: b) Zigzag line
25. Which component is used to store electrical energy in a magnetic field?
a) Inductor
b) Capacitor
c) Resistor
d) Transformer
Answer: a) Inductor
