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1461
All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
  • A. 120J
  • B. 60Jg-1
  • C. 120Jg-1
  • D. 1500J
  • E. 1500Jg-1
View Answer & Discuss (3) JAMB 1979
1462
The speed of light in air is 3 x 108ms-1. If the refractive index of light from air-to-water is \(\frac{4}{3}\), then which of the following is the correct value of the speed of light in water?
  • A. 4 x 108ms-1
  • B. 2.25 x 108ms-1
  • C. \(\frac{4}{9}\) x 108ms-1
  • D. 2.25 x 102ms-1
  • E. 4.33 x 108ms-1
View Answer & Discuss (6) JAMB 1979
1463
On which of the following is the operation of a moving coil galvanometer based?
  • A. Magnetic effect of electric current
  • B. Electromagnetic induction
  • C. Chemical reaction produced by electricity
  • D. Force on current carrying conductor in a magnetic field
  • E. Electrical energy and power
View Answer & Discuss (1) JAMB 1979
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1464

A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is?

  • A. a little above half of its initial energy
  • B. a little below half of its initial energy
  • C. a half of its initial energy
  • D. a little above its initial energy
  • E. a little below its initial energy
View Answer & Discuss (12) JAMB 1979
1465
It is known that a neutron exists in a light atomic nucleus. Which of the following also exists in the nucleus?
  • A. an electron
  • B. a \(\beta\)-particle
  • C. an \(\alpha\)-particle
  • D. a proton
  • E. an atom
View Answer & Discuss (5) JAMB 1979
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