Monthly Student Online Competition

12th Class Physics Chapter 16 MCQs with Answers

12th Class Physics Chapter 16 MCQs

Prepare thoroughly for Alternating Current (AC) with 12th Class Physics Chapter 16 MCQs. Topics include AC circuits, RMS values, and power factor. Trending terms like alternating current quiz, AC circuit MCQs, and physics power factor test enhance learning and rankings.

What is the frequency of the alternating current (AC) supplied to most households in the
United States?
a) 50 Hz
b) 60 Hz
c) 50 kHz
d) 60 kHz

Answer
b) 60 Hz

In an AC circuit, the current:
a) Always flows in one direction
b) Always flows in the opposite direction
c) Reverses direction periodically
d) Remains constant over time

Answer
c) Reverses direction periodically

The peak value of an AC voltage is 100V. What is its root mean square (RMS) value?
a) 50V
b) 70.7V
c) 100V
d) 141.4V

Answer
b) 70.7V

In an AC circuit, the power is calculated using the:
a) Peak voltage
b) Peak current
c) RMS voltage
d) RMS current

Answer
d) RMS current

What is the phase difference between the voltage and current in a purely resistive AC
circuit?
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
a) 0 degrees

In an AC circuit, the impedance of a pure inductor is proportional to the:
a) Frequency of the AC
b) Amplitude of the AC
c) Phase difference between voltage and current
d) Resistance of the circuit

Answer
a) Frequency of the AC

What is the phase difference between the voltage and current in a purely inductive AC
circuit?
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
c) 90 degrees

Which component of an AC circuit leads to energy dissipation and heating?
a) Capacitor
b) Inductor
c) Resistor
d) Transformer

Answer
c) Resistor

What is the phase difference between the voltage and current in a purely capacitive AC
circuit?
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
c) 90 degrees

In an AC circuit, the impedance of a pure capacitor is inversely proportional to the:
a) Frequency of the AC
b) Amplitude of the AC
c) Phase difference between voltage and current
d) Resistance of the circuit

Answer
a) Frequency of the AC

What is the relationship between the peak voltage (Vp) and the RMS voltage (Vrms) in an
AC circuit?
a) Vp = Vrms
b) Vp = 2 * Vrms
c) Vp = √2 * Vrms
d) Vp = √3 * Vrms

Answer
c) Vp = √2 * Vrms

In an AC circuit, the power factor is the cosine of the angle between:
a) Voltage and resistance
b) Voltage and current
c) Current and resistance
d) Voltage and reactance

Answer
b) Voltage and current

Which type of circuit consists of both resistive and reactive elements in an AC circuit?
a) Series circuit
b) Parallel circuit
c) RLC circuit
d) Purely resistive circuit

Answer
c) RLC circuit

What is the relationship between the capacitive reactance (X
c) and the frequency (f) in an
AC circuit?
a) Xc = 1/f
b) Xc = f
c) Xc = f^2
d) Xc = √f

Answer
a) Xc = 1/f

What is the unit of capacitive reactance (X
c)?
a) Ohm
b) Henry
c) Farad
d) Siemens

Answer
a) Ohm

What is the relationship between the inductive reactance (XL) and the frequency (f) in an
AC circuit?
a) XL = 1/f
b) XL = f
c) XL = f^2
d) XL = √f

Answer
b) XL = f

What is the unit of inductive reactance (XL)?
a) Ohm
b) Henry
c) Farad
d) Siemens

Answer
a) Ohm

What is the total impedance of a series RLC circuit?
a) The sum of resistive, capacitive, and inductive impedances
b) The product of resistive, capacitive, and inductive impedances
c) The difference between resistive, capacitive, and inductive impedances
d) The reciprocal of resistive, capacitive, and inductive impedances

Answer
a) The sum of resistive, capacitive, and inductive impedances

In an AC circuit, when the resistance is equal to the reactance, the power factor is:
a) 0
b) 1
c) √2
d) 2

Answer
b) 1

What is the power factor of an AC circuit with purely resistive elements?
a) 0
b) 0.5
c) 1
d) √2

Answer
c) 1

What is the power factor of an AC circuit with purely inductive elements?
a) 0
b) 0.5
c) 1
d) √2

Answer
a) 0

What is the power factor of an AC circuit with purely capacitive elements?
a) 0
b) 0.5
c) 1
d) √2

Answer
a) 0

Which component is used to improve the power factor of AC circuits?
a) Capacitor
b) Inductor
c) Resistor
d) Transformer

Answer
a) Capacitor

The phase difference between the voltage and current in a purely resistive AC circuit is:
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
a) 0 degrees

The phase difference between the voltage and current in a purely capacitive AC circuit is:
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
c) 90 degrees

The phase difference between the voltage and current in a purely inductive AC circuit is:
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
b) 45 degrees

In an AC circuit, the impedance of a pure capacitor is:
a) Directly proportional to the capacitance and inversely proportional to the frequency
b) Inversely proportional to the capacitance and directly proportional to the frequency
c) Directly proportional to both capacitance and frequency
d) Inversely proportional to both capacitance and frequency

Answer
b) Inversely proportional to the capacitance and directly proportional to the frequency

In an AC circuit, the impedance of a pure inductor is:
a) Directly proportional to the inductance and directly proportional to the frequency
b) Inversely proportional to the inductance and directly proportional to the frequency
c) Directly proportional to both inductance and frequency
d) Inversely proportional to both inductance and frequency

Answer
a) Directly proportional to the inductance and directly proportional to the frequency

What is the name of the process in which an alternating current changes its direction periodically?
a) Polarization
b) Induction
c) Oscillation
d) Reversal

Answer
d) Reversal

In an AC circuit, the voltage across a resistor and an inductor are 90 degrees out of phase. What type of circuit is this?
a) Series RLC circuit
b) Parallel RLC circuit
c) Purely resistive circuit
d) Purely inductive circuit

Answer
a) Series RLC circuit

The peak value of an AC current is 5A. What is its RMS value?
a) 3.5A
b) 5A
c) 7.07A
d) 10A

Answer
c) 7.07A

What is the unit of inductance?
a) Ohm
b) Henry
c) Farad
d) Siemens

Answer
b) Henry

What is the unit of capacitance?
a) Ohm
b) Henry
c) Farad
d) Siemens

Answer
c) Farad

The phase difference between the voltage and current in a purely resistive AC circuit is:
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
a) 0 degrees

The phase difference between the voltage and current in a purely capacitive AC circuit is:
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
c) 90 degrees

The phase difference between the voltage and current in a purely inductive AC circuit is:
a) 0 degrees
b) 45 degrees
c) 90 degrees
d) 180 degrees

Answer
b) 45 degrees

In an AC circuit, the impedance of a pure capacitor is:
a) Directly proportional to the capacitance and inversely proportional to the frequency
b) Inversely proportional to the capacitance and directly proportional to the frequency
c) Directly proportional to both capacitance and frequency
d) Inversely proportional to both capacitance and frequency

Answer
b) Inversely proportional to the capacitance and directly proportional to the frequency

In an AC circuit, the impedance of a pure inductor is:
a) Directly proportional to the inductance and directly proportional to the frequency
b) Inversely proportional to the inductance and directly proportional to the frequency
c) Directly proportional to both inductance and frequency
d) Inversely proportional to both inductance and frequency

Answer
a) Directly proportional to the inductance and directly proportional to the frequency

What is the name of the process in which an alternating current changes its direction periodically?
a) Polarization
b) Induction
c) Oscillation
d) Reversal

Answer
d) Reversal

In an AC circuit, the voltage across a resistor and an inductor are 90 degrees out of phase. What type of circuit is this?
a) Series RLC circuit
b) Parallel RLC circuit
c) Purely resistive circuit
d) Purely inductive circuit

Answer
a) Series RLC circuit

The peak value of an AC current is 5A. What is its RMS value?
a) 3.5A
b) 5A
c) 7.07A
d) 10A

Answer
c) 7.07A

What is the unit of inductance?
a) Ohm
b) Henry
c) Farad
d) Siemens

Answer
b) Henry

What is the unit of capacitance?
a) Ohm
b) Henry
c) Farad
d) Siemens

Answer
c) Farad

In an AC circuit, the power factor is the ratio of:
a) Active power to apparent power
b) Reactive power to active power
c) Apparent power to reactive power
d) Active power to reactive power

Answer
a) Active power to apparent power

Which device is used to improve the power factor in AC circuits?
a) Transformer
b) Inductor
c) Capacitor
d) Resistor

Answer
c) Capacitor

In an AC circuit, the power factor can have a value between:
a) -1 and 1
b) 0 and 1
c) 0 and -1
d) -∞ and ∞

Answer
b) 0 and 1

What is the unit of power factor?
a) Ohm
b) Henry
c) Farad
d) No unit (dimensionless)

Answer
d) No unit (dimensionless)

In an AC circuit, when the power factor is 1, the current and voltage are:
a) In phase
b) 90 degrees out of phase
c) 180 degrees out of phase
d) Not related to each other

Answer
a) In phase

What is the power factor of an ideal purely resistive AC circuit?
a) 0
b) 0.5
c) 1
d) √2

Answer
c) 1

What is the power factor of an ideal purely inductive AC circuit?
a) 0
b) 0.5
c) 1
d) √2

Answer
a) 0

What is the power factor of an ideal purely capacitive AC circuit?
a) 0
b) 0.5
c) 1
d) √2

Answer
a) 0

What is the power factor of a circuit with only resistive and capacitive elements?
a) 0
b) 0.5
c) 1
d) √2

Answer
b) 0.5

What is the power factor of a circuit with only resistive and inductive elements?
a) 0
b) 0.5
c) 1
d) √2

Answer
b) 0.5

What is the power factor of a circuit with only capacitive and inductive elements?
a) 0
b) 0.5
c) 1
d) √2

Answer
a) 0

What is the power factor of a circuit with a combination of resistive, capacitive, and inductive elements?
a) 0
b) 0.5
c) 1
d) √2

Answer
b) 0.5

What is the power factor of an AC circuit with a purely resistive load?
a) 0
b) 0.5
c) 1
d) √2

Answer
c) 1

What is the power factor of an AC circuit with a purely inductive load?
a) 0
b) 0.5
c) 1
d) √2

Answer
a) 0

What is the power factor of an AC circuit with a purely capacitive load?
a) 0
b) 0.5
c) 1
d) √2

Answer
a) 0

In an AC circuit, the impedance of a pure inductor is:
a) Directly proportional to the inductance and directly proportional to the frequency
b) Inversely proportional to the inductance and directly proportional to the frequency
c) Directly proportional to both inductance and frequency
d) Inversely proportional to both inductance and frequency

Answer
a) Directly proportional to the inductance and directly proportional to the frequency

What is the name of the process in which an alternating current changes its direction periodically?
a) Polarization
b) Induction
c) Oscillation
d) Reversal

Answer
d) Reversal

If you are interested to enhance your knowledge regarding  Physics, Chemistry, Biology, and Computer please click on the link of each category, you will be redirected to dedicated website for each category.

Was this article helpful?
YesNo
See Also  12th Class Chemistry Chapter 3 MCQs with Answers
Facebook
Twitter
LinkedIn
WhatsApp
Pinterest
Telegram
Picture of YFP

YFP

YFP empower the youth with the ability to nurture their communication and leadership skills at a common national platform resulting in greater self-confidence and personal growth.

Leave a Reply

Your email address will not be published. Required fields are marked *