Free Alternating Current MCQs with Answers
592 Alternating Current MCQs from Physics, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Alternating current varies periodically, so phase relationships become essential when current passes through a resistor, capacitor or inductor. The chapter distinguishes resistance from capacitive and inductive reactance, explains phase lead and lag, and connects changing electric and magnetic fields with the production and properties of electromagnetic waves.
Last updated
Read the Alternating Current notesFree MDCAT chapter notes with key terms592 questions · page 27 of 30
- A. γ rays
- B. UV
- C. Microwaves
- D. X rays
Explanation: Electromagnetic radiation consists of various types of waves with different wavelengths.
Correct answer: Microwaves- A. 1.0 x 10^6 Hz
- B. 1.0 x 10^9 Hz
- C. 1.0 x 10^12 Hz
- D. 1.0 x 10^15Hz
Explanation: The frequency of electromagnetic waves, including ultraviolet radiation, is often measured in hertz (Hz), where 1 Hz is equivalent to one…
Correct answer: 1.0 x 10^15Hz- A. Infrared
- B. X-rays
- C. UV
- D. Gamma rays
Explanation: The electromagnetic spectrum consists of various types of radiation, each with a different wavelength.
Correct answer: Infrared- A. 10-10
- B. 10-8
- C. 10-4
- D. 10-12
Explanation: The value for the wavelength of X-rays is 10-10 corresponding to frequencies in the range of 30 petahertz (PHz) to 30 exahertz (EHz).
Correct answer: 10-10- A. Cell
- B. Skin
- C. Hair
- D. All of these
Explanation: The dosage of radiations is measured in sieverts or microsieverts given by the formula:De = D x RBE where D = energy from radiation / mass…
Correct answer: All of these- A. Gamma rays
- B. Light
- C. Radio waves
- D. All of these
Explanation: All of the above waves belong to electromagnetic waves. In space, electromagnetic waves travel at the same speed which is the speed of…
Correct answer: All of these- A. speed of electromagnetic waves
- B. Frequency of light
- C. speed of light
- D. Frequency of electromagnetic waves
Explanation: Accelerating electromagnetic charges, such as electrons, radiate electromagnetic waves, which are a combination of electric and magnetic…
Correct answer: speed of light- A. 10 kHz
- B. 0.1 MHz
- C. 1 kHz
- D. 1000Hz
Explanation: Explanation:Frequency is measured in Hertz (Hz). Higher frequency means more cycles per second.1 kHz = 1000 Hz, 1 MHz = 1,000,000 Hz.0.1…
Correct answer: 0.1 MHz- A. Sonic
- B. Supersonic
- C. Hypersonic
- D. Ultrasonic
- E. infrasonic
Explanation: When an object is moving faster than the speed of sound in a medium, it is considered supersonic.
Correct answer: Supersonic- A. 1/√µ0ε0
- B. 1/2 µ0ε0
- C. 1/µ0ε0
- D. √µ0ε0
- E. µ0ε0
Explanation: Answer : AExplanation : As it is a numerical only one option is correct
Correct answer: 1/√µ0ε0- A. Motion of electric and magnetic fields
- B. Chargeless particles
- C. A static charge
- D. Heat
- E. None of the above
Explanation: Electromagnetic waves are the combination of electric and magnetic field waves produced by moving charges.The creation of all…
Correct answer: Motion of electric and magnetic fields- A. 7800 Å to 1500 Å
- B. 1Å to 100 Å
- C. 4000 Å to 8000 Å
- D. 8000 Å to 10,000 Å
Explanation: The range of wavelengths for visible light is 4000 Å to 8000 Å
Correct answer: 4000 Å to 8000 Å- A. X-rays
- B. Radio waves
- C. Infra red
- D. Visible light
Explanation: The wavelength of electromagnetic waves increases as you move from Gamma to Radio waves.
Correct answer: Radio waves- A. I only.
- B. III only.
- C. I and II.
- D. All of these
Explanation: I. light waves: Yes, as they are electromagnetic waves and the Doppler effect applies to them (e.g., in astronomy). * II.
Correct answer: All of these- A. be longer.
- B. be shorter
- C. become infinite.
- D. remain the same.
Explanation: * Doppler Effect Principle: The Doppler Effect describes the change in frequency or wavelength of a wave in relation to an observer who is…
Correct answer: be shorter536. Which of the following options shows the behaviour of X-rays when it passes through magneticfield?
- A. Option A:They are deflected
- B. Option B:They are absorbed
- C. Option C:They are accelerated
- D. Option D:They are unaffected
Explanation: X-rays are a form of electromagnetic radiation and, unlike charged particles, are not influenced by magnetic fields.
Correct answer: Option D:They are unaffected- A. parallel to the electric field only
- B. perpendicular to the magnetic field only.
- C. parallel to both electric and magnetic fields.
- D. perpendicular to both electric and magnetic fields.
Explanation: The correct answer is Option D: perpendicular to both electric and magnetic fields.
Correct answer: perpendicular to both electric and magnetic fields.- A. Velocity
- B. Intensity
- C. Amplitude
- D. Acceleration
Explanation: In frequency modulation (FM), the frequency of the carrier wave is varied in proportion to the amplitude of the modulating signal while…
Correct answer: Intensity- A. 14.1 A
- B. 10 A
- C. 20 A
- D. 28.2 A
Explanation: The root mean square (rms) value of an alternating current (AC) can be calculated from its peak value using the following formula: Irms =…
Correct answer: 14.1 A- A. 100Hz
- B. 25Hz
- C. 50Hz
- D. 75Hz
Explanation: The equation for the alternating voltage you've provided is in the form of Vt=Vm sin(ωt)where:Vm is the peak voltage, andω is the angular…
Correct answer: 25Hz