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CBSE

Subject

Physics

NEET Physics : Alternating Current

Multiple Choice Questions

51.

If frequency of R-L circuit is f then impedance will be

$\sqrt{R^{2} + {(2 πfL)}^{2}}$
R² + ( 2 $π$ f² )²
$\sqrt{(R^{2} + {Lπf}^{2})}$
R² + (2 $π$ f )²

52.

Two sinusoidal waves of intensity I having same frequency and same amplitude interferes constructively at a point. The resultant intensity at a point will be

53.

What is the mechanical equivalent of spring constant kin LC oscillating circuit?

$\frac{1}{L}$
$\frac{1}{C}$
$\frac{L}{C}$
$\frac{1}{L C}$

54.

In an electrical containing L, C and R which of the following does not denote the dimensions and frequency?

LC
$\frac{1}{\sqrt{L C}}$
$\frac{1}{RC}$
$\frac{R}{L}$

55.

In given series LCR circuit R = 4Ω, X_L = 5 Ω and X_C = 8Ω, the current

Leads the voltage by tan^-1(3/4).
Leads the voltage by tan^-1(5/8)
Lags the voltage by tan^-1(3/4)
Lags the voltage by tan^-1(5/8)

56.

Reciprocal of impedance is

susceptance
conductance
admittance
transconductance

57.

Which of the following parameter in the series LCR circuit is analogous to driving force F(t) in mechanics?

$\frac{V_{0}}{L}$
inductance L
capacitance C
voltage V₀

58.

Alternating current cannot be measured by D.C ammeter because

A.C cannot pass through D.C parameter
A.C changes direction
average value of current for complete cycle is zero
D.C ammeter will get changed

59.

In an AC circuit, voltage V = V₀sinωt and inductor L is connected across the circuit. Then the instantaneous power will be

$\frac{V_{0}^{2}}{2 ωL} sinωt$
$\frac{- V_{0}^{2}}{2 ωL} sinωt$
$\frac{- V_{0}^{2}}{2 ωL} \sin 2 ωt$
$\frac{V_{0}^{2}}{ωL} \sin 2 ωt$

60.

In a series LCR circuit, the voltage across the resistance, capacitance and inductance is 10 V each. If the capacitance is short circuited the voltage across the inductance will be

140 V
10 $\sqrt{2}$ V
10/ $\sqrt{2}$ V
20 V

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