Electromagnetic Induction & Alternating Currents [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 102 - 105 of 215
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Question 102
Question Assertion-Reason▾
Assertion(Ꭺ)
When capacitive reactance is smaller than the inductive reactance in LCR current, e. m. f. leads the current.
Reason(Ꭱ)
The phase angle is the angle between the alternating e. m. f. and alternating current of the circuit.
Choices
Choice (4) | Response | |
---|---|---|
a. | Ꭺ is true but Ꭱ is false | |
b. | Ꭺ is false but Ꭱ is true | |
c. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ | |
d. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ |
Question 103
Question MCQ▾
In a series LCR circuit, resistance R = 10 Ω and the impedance Z = 20 Ω . The phase difference between the current and the voltage is,
Choices
Choice (4) | Response | |
---|---|---|
a. | 90° | |
b. | 45° | |
c. | 60° | |
d. | 30° |
Question 104
Question MCQ▾
A 10 ohm resistance, 5 mH inductance coil and 10 µF capacitor are joined in series. When a suitable frequency alternating current source is joined to this combination, the circuit resonates. If the resistance is halved, the resonance frequency
Choices
Choice (4) | Response | |
---|---|---|
a. | is halved | |
b. | is quadrupled | |
c. | remains unchanged | |
d. | is doubled |
Question 105
Question Assertion-Reason▾
Assertion(Ꭺ)
Choke coil is preferred over a resistor to adjust current in an ac circuit.
Reason(Ꭱ)
Power factor for inductance is zero.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ | |
b. | Both Ꭺ and Ꭱ are false | |
c. | Ꭺ is false but Ꭱ is true | |
d. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |