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Physics 1986 JAMB Past Questions

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21
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 & Discuss (2) JAMB 1986
22
If the refractive index of glass is 1.5, what is the critical angle at the air-glass interface?
  • A. sin-1\(\frac{1}{2}\)
  • B. sin-1\(\frac{2}{3}\)
  • C. sin-1\(\frac{3}{4}\)
  • D. sin-1\(\frac{8}{9}\)
View Answer & Discuss (4) JAMB 1986
23
A dentist obtains a linear magnification of 4 of a hole in a tooth by placing a concave mirror at a distance, of 2.0cm from the tooth. The radius of Curvature of the mirror is
  • A. 5.3cm
  • B. 3.2cm
  • C. 2.7cm
  • D. 1.6cm
View Answer & Discuss (22) JAMB 1986
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24
What is the effect of the increase in the size of the hole of a pin-hole camera on the image? it
  • A. gives a blurred image
  • B. corrects for chromatic aberration
  • C. magnifies the image
  • D. brings the image into a sharper focus
View Answer & Discuss (4) JAMB 1986
25

A pencil is placed vertically between a concave mirror and its focal point. The image of the pencil in the mirror will be

  • A. real, inverted and diminished
  • B. virtual, inverted and enlarged
  • C. real, erect and enlarged
  • D. virtual, erect and enlarged
View Answer & Discuss (5) JAMB 1986
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