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PHYSICS MCQs

Total Questions : 3767 | Page 43 of 377 pages
Question 421. If the phase difference between two points is 120° for a wave with velocity of 360 m/s and frequency 500 Hz, then path difference between the two points is
  1.    1 cm
  2.    6 cm
  3.    12 cm
  4.    24 cm
 Discuss Question
Answer: Option D. -> 24 cm
Question 422. The frequency of ultrasound wave is typically
  1.    Above 20 kHz
  2.    Above 20,000 kHz
  3.    Below 20 kHz
  4.    Below 02 kHz
 Discuss Question
Answer: Option A. -> Above 20 kHz
Question 423. Why are we able to hear short wave broadcasts better than long wave broadcasts ?
  1.    Short waves are more energetic than long waves.
  2.    Short waves are unaffected by atmospheric disturbances.
  3.    Short wave broadcasts are made by nearby radio stations.
  4.    By convention, short waves are meant for long distances, whereas long waves are reserved for short distances.
 Discuss Question
Answer: Option A. -> Short waves are more energetic than long waves.
Question 424. Which of the following has the highest frequency?
  1.    Cosmic rays
  2.    X-rays
  3.    Radio waves
  4.    Microwaves
 Discuss Question
Answer: Option A. -> Cosmic rays
Question 425. Matter waves are
  1.    De Broglie waves
  2.    Electromagnetic waves
  3.    Transverse waves
  4.    Longitudinal waves
 Discuss Question
Answer: Option A. -> De Broglie waves
Question 426. Two waves, each of amplitude 1.5 mm and frequency 10 Hz, are travelling in opposite direction with a speed of 20 mm/s. The distance in mm between adjacent nodes is :
  1.    1.0
  2.    1.2
  3.    1.5
  4.    2.0
 Discuss Question
Answer: Option A. -> 1.0
Question 427. Intensity of any wave is proportional to which of the following?
  1.    Amplitude
  2.    Square of amplitude
  3.    Square root of amplitude
  4.    Cube of amplitude
 Discuss Question
Answer: Option B. -> Square of amplitude
Question 428. Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?
  1.    It is narrow band of high-velocity wind.
  2.    It follows the wave path near the tropopause at elevations of 8 km to 15 km.
  3.    Jet streams are typically continuous over long distances.
  4.    In summer, the polar front jet achieves its maximum force.
 Discuss Question
Answer: Option B. -> It follows the wave path near the tropopause at elevations of 8 km to 15 km.
Question 429. If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
  1.    4 : 1
  2.    2 : 1
  3.    1 : 16
  4.    1 : 4
 Discuss Question
Answer: Option D. -> 1 : 4
Question 430. When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are
  1.    Longitudinal
  2.    Transverse
  3.    Both longitudinal and transverse
  4.    Waves are not produced
 Discuss Question
Answer: Option B. -> Transverse

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