NEET: #2 | AC & DC Definition | Exam Video Class Lectures

Q:

In the diagram, two sinusoidal voltages of the same frequency are shown. What is the frequency and the phase relationship between the voltages?

	Frequency in Hz	Phase lead of $N$ over $M$ in radians
1.	$0.4$	$-\pi/4$
2.	$2.5$	$-\pi/2$
3.	$2.5$	$+\pi/2$
4.	$2.5$	$-\pi/4$

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Q:

An ideal inductor connected to a cell is shown in figure. Select the correct relations between readings of ammeters $A_{1} a n d A_{2}$ $A_{1} a n d A_{2}$ just after the switch is closed and a long time after closing the switch

$1 . A_{1} > A_{2}; A_{1} < A_{2}$ $1 . A_{1} > A_{2}; A_{1} < A_{2}$
$2 . A_{1} > A_{2}; A_{2} = A_{1}$ $2 . A_{1} > A_{2}; A_{2} = A_{1}$
$3 . A_{1} < A_{2}; A_{1} < A_{2}$ $3 . A_{1} < A_{2}; A_{1} < A_{2}$
$4 . A_{1} < A_{2}; A_{1} = A_{2}$ $4 . A_{1} < A_{2}; A_{1} = A_{2}$

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Q:

A direct current of $2~\text{A}$ and an alternating current having peak value $2~\text{A}$ flow through two identical resistances at the same time. The ratio of heat produced in the two resistance will be:
1. $1:1$
2. $1:2$
3. $2:1$
4. $4:1$

65%

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Q:

Given below are two statements.

Assertion (A):	When a current $I=(3+4 \sin \omega t)$ flows in a wire, then the reading of a dc ammeter connected in series is $4$ units.
Reason (R):	A dc ammeter measures only the value of the current amplitude.

1.	Both (A) and (R) are True and (R) is the correct explanation of (A).
2.	Both (A) and (R) are True but (R) is not the correct explanation of (A).
3.	(A) is True but (R) is False.
4.	Both (A) and (R) are False.

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