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PHYSICS MCQs

Total Questions : 3767 | Page 44 of 377 pages
Question 431. When a light wave is reflected from a mirror, there is a change in its
  1.    Frequency
  2.    Amplitude
  3.    Wavelength
  4.    Velocity
 Discuss Question
Answer: Option B. -> Amplitude
Question 432. A doppler effect occurs when a source of sound moves
  1.    Away from you
  2.    Towards you
  3.    Both A & B
  4.    None of the above
 Discuss Question
Answer: Option C. -> Both A & B
Question 433. Stationary wave is formed by
  1.    A transverse wave superposing a longitudinal wave
  2.    Two waves of the same speed superposing
  3.    Two waves of same frequency travelling in the same direction
  4.    Two waves of same frequency travelling in the opposite direction
 Discuss Question
Answer: Option D. -> Two waves of same frequency travelling in the opposite direction
Question 434. Ultrasound devices operate with minimum frequency from
  1.    20kHz
  2.    35 kHz
  3.    45 kHz
  4.    60 kHz
 Discuss Question
Answer: Option A. -> 20kHz
Question 435. Which of the following is not a transverse wave?
  1.    Light waves
  2.    Radio waves
  3.    Sound waves
  4.    All the above
 Discuss Question
Answer: Option C. -> Sound waves
Question 436. What is the name of the device used to convert alternating current into direct current ?
  1.    Ammeter
  2.    Galvanometer
  3.    Rectifier
  4.    Transformer
 Discuss Question
Answer: Option C. -> Rectifier
Question 437. A Step-Up transformer increases
  1.    Power
  2.    Current
  3.    Frequency
  4.    Voltage
 Discuss Question
Answer: Option D. -> Voltage
Question 438. A transformer
  1.    Converts DC to AC
  2.    Is used to decrease or increase AC voltage
  3.    Converts AC voltage to D.C. voltage
  4.    Converts electrical energy into mechanical energy
 Discuss Question
Answer: Option B. -> Is used to decrease or increase AC voltage
Question 439. In AC circuits, AC meters measure
  1.    Mean values
  2.    Rms values
  3.    Peak values
  4.    Mean square values
 Discuss Question
Answer: Option B. -> Rms values
Question 440. Which sources produce alternating current (AC)?
  1.    Solar power plants
  2.    Hydro-electric generators
  3.    Batteries
  4.    All of the above
 Discuss Question
Answer: Option B. -> Hydro-electric generators

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