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Monday, 17 August 2026
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Physics Past Questions and Answers

Topic: Waves

Jamb Physics Questions - Waves

Question 26:
In order to find the depth of the sea, a ship sends out a sound wave and receives an echo after one second. If the velocity of sound in water is 1500ms-1, what is the depth of the sea?
  • A 0.75km
  • B 1.50km
  • C 2.20km
  • D 3.00km
  • E 3.75km
View Answer & Explanation
Question 27:
When a sound wave passes from air into water its
  • A Speed and frequency increases but its wavelength remains the same
  • B Speed and wavelength increases but its frequency remains the same
  • C Speed decreases
  • D Speed remains the same but its frequency and wavelength change
  • E Speed increases but its frequency and wavelength decreases
View Answer & Explanation
Question 28:
A heavy object is suspended from a string and lowered into water so that it is completely submerged. The object appears lighter because
  • A The density of water is less than that of the object
  • B The pressure is low just below the water surface
  • C It experiences an upthrust
  • D The tension in the string neutralizes part of the weight
View Answer & Explanation
Question 29:
The mode of heat transfer which does not require a material medium is
  • A Conduction
  • B Radiation
  • C Convection
  • D Propagation
View Answer & Explanation
Question 30:
In which of the following arrangements is the wavelength in an increasing order?
  • A Gamma rays, infra-red rays, x-rays, radiowaves
  • B Gamma rays, x-rays, infra-red ray, radiowaves
  • C Radiowaves, x-rays, gamma ray, infra-red rays
  • D Infra-red rays, radiowaves, x-rays, gamma rays
View Answer & Explanation