MHT-CET SERIES

Physics

Alternating Current

31 previous year questions.

Volume: 31 Ques

Yield: High

High-Yield Trend

7

2025

2

2024

2

2022

14

2020

2

2018

1

2016

1

2010

1

2006

1

2005

Chapter Questions
31 MCQs

01

PYQ 2005

easy

physics ID: mht-cet-

In series L-C-R circuit, the capacitance is changed from C to 2C. The inductance should be changed from L to ... to obtain same resonance frequency.

1

4L

2

L/2

3

L/4

4

2L

02

PYQ 2006

medium

physics ID: mht-cet-

ln an AC circuit, the current lags behind the voltage by /3. The components of the circuit are

1

R and L

2

L and C

3

R and C

4

only R

03

PYQ 2010

medium

physics ID: mht-cet-

Average power in the circuit depends upon

1

current

2

phase difference only

3

emf

4

current, emf and phase difference

04

PYQ 2016

medium

physics ID: mht-cet-

Alternating current of peak value ampere flows through the primary coil of the transformer. The coefficient of mutual inductance between primary and secondary coil is 1 henry. The peak e.m.f. induced in secondary coil is (Frequency of)

1

2

3

4

05

PYQ 2018

medium

physics ID: mht-cet-

An ideal transformer converts a.c. to a.c. to transmit a power of . If primary coil has turns, then alternating current in secondary coil is

1

2

3

4

06

PYQ 2018

easy

physics ID: mht-cet-

An alternating voltage volt is connected to capacitor through AC ammeter. The reading of ammeter is

1

2

3

4

07

PYQ 2020

medium

physics ID: mht-cet-

In series LCR circuit, resistance is 18 and impedance is 33 . An r.m.s. voltage of 220 V is applied across the circuit. The true power consumed in a.c. circuit is

1

400 V

2

600 V

3

800 V

4

200 V

08

PYQ 2020

medium

physics ID: mht-cet-

A sonometer wire of length is in resonance with a frequency 250 Hz. If the length of wire is increased to, then 2 beats per second are heard. The ratio of lengths of wire will be

1

2

3

4

09

PYQ 2020

medium

physics ID: mht-cet-

Assuming the earth to be a sphere of uniform density, the ratio of acceleration due to gravity on the earth's surface to its value at halfway towards the centre of the earth, will be

1

2

3

4

10

PYQ 2020

medium

physics ID: mht-cet-

A stone of mass attached at one end of a long string is whirled in a horizontal circle. The string makes an angle of with the vertical. Then the centripetal force acting on the stone is (,)

1

2

3

4

11

PYQ 2020

medium

physics ID: mht-cet-

In a series LCR circuit at resonance, the applied e.m.f. of the source and current in the circuit are:

1

out of phase.

2

differ in phase by rad.

3

in phase.

4

differ in phase by rad.

12

PYQ 2020

medium

physics ID: mht-cet-

The phase difference between the voltage and the current in an a.c. circuit is . If the frequency is 50 Hz, then the phase difference is equivalent to a time of:

1

2

3

4

13

PYQ 2020

medium

physics ID: mht-cet-

In the differential equation of linear simple harmonic motion, the term represents

1

restoring force per unit mass per unit displacement

2

restoring force per unit displacement

3

restoring force per unit mass

4

acceleration per unit mass per unit displacement

14

PYQ 2020

medium

physics ID: mht-cet-

An alternating current of frequency 50 Hz has the peak value as 14.14 A. The time taken by the alternating current in reaching from zero to maximum value and r.m.s. value of current will be respectively

1

0.025 s, 5 A

2

0.005 s, 5 A

3

0.005 s, 10 A

4

0.025 s, 10 A

15

PYQ 2020

medium

physics ID: mht-cet-

A resistance of, inductor of self-inductance and a capacitor of unknown capacitance are connected in series to an a.c. source of and . When the current and voltage are in phase, the capacitance and power dissipated respectively are

1

2

3

4

16

PYQ 2020

medium

physics ID: mht-cet-

The density of a metal at normal pressure is . When it is subjected to an excess pressure, the density becomes . If is the bulk modulus of the metal, then the ratio is

1

2

3

4

17

PYQ 2020

medium

physics ID: mht-cet-

An ammeter of resistance 20 gives full scale deflection when 1 mA current flows through it. What is the maximum current that can be measured by connecting 4 resistors each of 16 in parallel with the meter?

1

6 mA

2

8 mA

3

4 mA

4

2 mA

18

PYQ 2020

medium

physics ID: mht-cet-

In an LCR circuit, inductive reactance is and capacitive reactance is . The resistance is found to be . The probable impedance of the combination is

1

2

3

4

19

PYQ 2020

medium

physics ID: mht-cet-

In a capacitive circuit, the reactance of capacitor at frequency is . What will be its reactance at frequency ?

1

2

3

4

20

PYQ 2020

medium

physics ID: mht-cet-

An alternating e.m.f. is given by . In what time the e.m.f. will have half its maximum value, if starts from zero? (T = Time period)

1

2

3

4

21

PYQ 2022

easy

physics ID: mht-cet-

In LCR series resonance circuit, choose the wrong statement

1

Resonance occurs at X L = X C

2

At resonance, current has a maximum value

3

At resonance, circuit is purely inductive

4

At resonance, impedance is minimum

22

PYQ 2022

easy

physics ID: mht-cet-

A condenser of capacity ‘C’ is charged to a potential difference of ‘V 1 ’. The plates of the condenser are then connected to an ideal inductor of inductance ‘L’. The current through an inductor when the potential difference across the condenser reduces to ‘V 2 ’ is

1

2

3

4

23

PYQ 2024

medium

physics ID: mht-cet-

A series LCR circuit is subjected to an AC signal of . If the voltage across the inductor () is, then the current in this circuit is:

1

2

3

4

24

PYQ 2024

medium

physics ID: mht-cet-

In an a.c. circuit, voltage and current are given by: The average power dissipated in one cycle is:

1

2

3

4

25

PYQ 2025

medium

physics ID: mht-cet-

When a capacitor is connected in series LR circuit, the alternating current flowing in the circuit}

1

remains constant

2

increases

3

decreases

4

is zero

26

PYQ 2025

medium

physics ID: mht-cet-

In the case of constant '' and '' of a transistor (and are current ratios)

1

2

3

4

27

PYQ 2025

medium

physics ID: mht-cet-

If '' and '' are the wavelengths of the first member of the Balmer and Paschen series, in hydrogen atom respectively, then the ratio of respective frequencies,, is

1

2

3

4

28

PYQ 2025

medium

physics ID: mht-cet-

The de-Broglie wavelength of a neutron at is ''. What will be its wavelength at ?

1

2

3

4

29

PYQ 2025

easy

physics ID: mht-cet-

In an LC circuit, the inductance is and the capacitance is . What is the frequency of oscillation of the circuit?

1

2

3

4

30

PYQ 2025

easy

physics ID: mht-cet-

An AC voltage is applied across a capacitor of capacitance . What is the rms value of the current through the capacitor?

1

2

3

4

31

PYQ 2025

hard

physics ID: mht-cet-

Given the voltage equation and capacitance, calculate the RMS current.

1

2

3

4