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Physics 1989 JAMB Past Questions

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11
An electric heater is used to melt a block of ice of mass 1.5kg. If the heater is powered by a 12V battery and a current of 20A flows through the coil, calculate the time taken to melt the block of ice at 0oC. [specific latent heat of fusion of ice = 336 x 103Jkg-1]
  • A. 76.0min
  • B. 35.0min
  • C. 21.0min
  • D. 2.9min
View Answer & Discuss (2) JAMB 1989
12
From the kinetic theory of gases, temperature is a
  • A. form of energy and is proportional to the total kinetic energy of the molecules
  • B. form of energy and is proportional to the average kinetic energy of the molecules
  • C. physical property and is proportional to the total kinetic energy of the molecules
  • D. physical property and is proportional to the average kinetic energy of the molecules
View Answer & Discuss (5) JAMB 1989
13

A vibrator of frequency 60Hz is used in generating transverse stationary waves in a long thin wire, If the average distance between successive nodes on the wire is 45cm, find the speed of the transverse waves in the wire.

  • A. 27ms-1
  • B. 54ms-1
  • C. 90ms-1
  • D. 108ms-1
View Answer & Discuss (16) JAMB 1989
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14

When the tension in a sonometer wire is doubled, the ratio of the new frequency to the initial frequency is?

  • A. \(\frac{1}{\sqrt2}\)
  • B. \(\frac{1}{2}\)
  • C. \(\sqrt2\)
  • D. 2
View Answer & Discuss (14) JAMB 1989
15
In a sound wave in air, the adjacent rarefactions and compressions are separated by a distance of 17cm. If the velocity of the sound wave is 340ms-1. Determine the frequency
  • A. 10Hz
  • B. 20Hz
  • C. 1000Hz
  • D. 5780Hz
View Answer & Discuss (14) JAMB 1989
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