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1461
If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
  • A. 30o
  • B. 42o
  • C. 45o
  • D. 50o
View Answer & Discuss (5) JAMB 1992
1462
Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?
  • A. Gamma rays, ultraviolet rays, X- rays, infra - red rays
  • B. Gamma rays, X-rays, ultraviolet rays, infra-red rays
  • C. infra-red rays, ultraviolet rays, X-rays, gamma rays
  • D. Gamma rays, ultraviolet rays, infra-red rays, X-rays
View Answer & Discuss (9) JAMB 1992
1463
The angle between the direction of the earth's magnetic field and the horizontal is called the
  • A. angle of deviation
  • B. magnetic declination
  • C. magnetic meridian
  • D. angle of dip
View Answer & Discuss (1) JAMB 1992
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1464
Calculate the force acting on an electron of charge 1.6 x 10-19C placed in an electric field of intensity 108Vm-1
  • A. 1.6 x 10-11N
  • B. 1.6 x 10-14N
  • C. 1.6 x 10-16N
  • D. 1.0 x 10-16N
View Answer & Discuss (1) JAMB 1992
1465

When an ebolite rod is rubbed with fur, it has

  • A. no charge at all
  • B. a negative charge
  • C. a positive charge
  • D. negative and positive charges
View Answer & Discuss (4) JAMB 1992
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