JKCET SERIES

Physics

Alternating Current

11 previous year questions.

Volume: 11 Ques

Yield: Medium

High-Yield Trend

1

2018

1

2017

1

2016

1

2015

1

2013

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2012

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2011

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2009

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2008

2

2003

Chapter Questions
11 MCQs

01

PYQ 2003

medium

physics ID: jkcet-20

The current gain a of a transistor is The transistor is connected to common base configuration. What would be the change in collector current when base current changes by ?

1

1.2 mA

2

12 mA

3

24 mA

4

36 mA

02

PYQ 2003

medium

physics ID: jkcet-20

In a full wave rectifier circuit operating from main frequency, the fundamental frequency in the ripple would be

1

25 Hz

2

50 Hz

3

70.7 Hz

4

100 Hz

03

PYQ 2008

medium

physics ID: jkcet-20

In L-C-R series circuit the resonance condition in terms of capacitive reactance () and inductive reactance (is

1

2

3

4

04

PYQ 2009

medium

physics ID: jkcet-20

In AC circuit Ohm's law is applicable for

1

instantaneous values of current and voltage only

2

rms values of current and voltage only

3

peak values of current and voltage only

4

all values of current and voltage

05

PYQ 2011

medium

physics ID: jkcet-20

In the case of an inductor

1

voltage lags the current by

2

voltage leads the current by

3

voltage leads the current by

4

voltage leads the current by

06

PYQ 2012

medium

physics ID: jkcet-20

What is the resonance frequency of a driven oscillator?

1

2

3

4

07

PYQ 2013

medium

physics ID: jkcet-20

A signal is applied in a circuit of inductance of and resistance The impedance offered by the circuit is

1

2

3

4

08

PYQ 2015

medium

physics ID: jkcet-20

In a transformer the number of primary turns is four times that of the secondary turns. Its primary is connected to an source of voltage . Then,

1

Current through its secondary is about four times that of the current through its primary

2

Voltage across its secondary is about four times that of the voltage across its primary

3

Voltage across its secondary is about two times that of the voltage across its primary

4

Voltage across its secondary is about times that of the voltage across its primary

09

PYQ 2016

easy

physics ID: jkcet-20

For an ideal step-down transformer, the quantity which is constant for both the coils is

10

PYQ 2017

medium

physics ID: jkcet-20

A resistance of is connected in series with a capacitance of . The combination is connected to source of angular frequency . Then

1

the voltage leads the current by

2

the current leads the voltage by

3

the current leads the voltage by

4

the voltage leads the current by

11

PYQ 2018

medium

physics ID: jkcet-20

If the mains voltage is then the peak voltage approximately is

1

2

3

4