Jamb Physics 1986 Past Questions and Answers

Question 21:

• JAMB 1986

A lens of focal length 12.0cm forms an upright image three times the size of a real object. The distance between the object and the images is

A. 8.0cm
B. 16.0cm
C. 24.0cm
D. 32.0cm

Question 22:

• JAMB 1986

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

Question 23:

• JAMB 1986

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\(\frac{8}{9}\)

Question 24:

• JAMB 1986

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

Question 25:

• JAMB 1986

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