Electromagnetic Induction & Alternating Currents [NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Physics]: Questions 38 - 41 of 215
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Question 38
Question MCQ▾
In the circuit, E = 10 volt, R1 = 5.0 ohm, R2 = 10 ohm and L = 5.0 henry. The current just after the switch S is pressed is.
Choices
Choice (4) | Response | |
---|---|---|
a. | 2.0A | |
b. | 6.0A | |
c. | 5.0A | |
d. | 3.0A |
Question 39
Question MCQ▾
An alternating current of frequency is flowing in a circuit containing a resistor of resistance R and a choke of inductance L in series. The impedance of this circuit is
Choices
Choice (4) | Response | |
---|---|---|
a. | ||
b. | ||
c. | ||
d. |
Question 40
Question Assertion-Reason▾
Assertion(Ꭺ)
The alternating current lags behind the emf by a phase angle of , when ac flows through an inductor.
Reason(Ꭱ)
The inductive reactance increases as the frequency of ac source decreases.
Choices
Choice (4) | Response | |
---|---|---|
a. | Both Ꭺ and Ꭱ are false | |
b. | Ꭺ is true but Ꭱ is false | |
c. | Ꭺ is false but Ꭱ is true | |
d. | Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ |
Question 41
Question MCQ▾
Large transformer, when used for some time, become hot and are cooled by circulating oil. The heating of transformer is due to
(1) Heating effect of current
(2) Hysteresis loss
(3) Chemical effect of current
(4) Magnetic effect of current
Select the correct answers and mark it according to the following
Choices
Choice (4) | Response | |
---|---|---|
a. | 1,2 and 3 are correct | |
b. | 1 and 2 are correct | |
c. | 1 and 3 are correct | |
d. | 2 and 4 are correct |