Jamb Physics 1987 Past Questions and Answers

Question 31:

• JAMB 1987

A ray of light is incident at an angle of 30^o on one top surface of a parallel-sided glass block of refractive index 1.5. The ray finally emerges from the lower surface. What is the angular deviation of the emergent ray?

A. 60^o
B. 39^o
C. 28^o
D. 0^o

Question 32:

• JAMB 1987

Four lenses are being considered for use as a microscope objective. Which of the following focal lengths is most suitable?

A. -5mm
B. +5mm
C. -5cm
D. +5cm

Question 33:

• JAMB 1987

If the angle of declination in a place is 10oE, calculate the true geographic bearing if the compass reads N40oE

A. N50^oE
B. N40^oE
C. N30^oE
D. N25^oE

Question 34:

• JAMB 1987

Two capacitance of 6\(\mu\)F and 8\(\mu\)F are connected in series. What additional capacitance must be connected in series with this combination to give a total of 3\(\mu\)F

A. 3\(\mu\)F
B. 16\(\mu\)F
C. 24\(\mu\)F
D. 30\(\mu\)F

Question 35:

• JAMB 1987

When a transformer has more secondary windings than primary windings, it

A. Has a smaller secondary current
B. Has a greater power output
C. Is a step-down transformer
D. Increases the total energy output