Kenya KCSE · Physics

Heat, light and waves

10 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 10 questions

  1. What energy is needed to raise the temperature of 2 kg of water by 10 degrees Celsius? (specific heat capacity of water = 4200 J/kg per degree Celsius)
  2. How is heat transferred through a vacuum?
  3. A steel rod 2.0 m long is heated and its temperature rises by 100 degrees Celsius. If the linear expansivity of steel is 0.000012 per degree Celsius, by how much does it expand?
  4. An object is placed 30 cm in front of a plane mirror. How far is the image from the object?
  5. The speed of a wave of frequency 50 Hz and wavelength 6 m is
  6. A ray of light passes from air into glass. Which statement is correct?
  7. The refractive index of glass is 1.5 and the speed of light in air is 3 x 10^8 m/s. What is the speed of light in the glass?
  8. A ship sends a sound pulse to the sea bed and receives the echo after 0.4 s. If sound travels at 1500 m/s in sea water, what is the depth of the sea?
  9. Which of these waves is longitudinal?
  10. A concave mirror forms a real, inverted image when the object is placed

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