Physics 1990 Waec Past Questions and Answers

Question 36 :

• WAEC 1990

The eye defect illustrated by the diagram above is

A. Astigmatism
B. Long sightedness
C. Loss accommodation
D. Short sightedness
E. Colour blindness

Question 37 :

• WAEC 1990

A simple microscope forms an image twice the size of the object. If the focal length of the lens of the microscope is 20m, how far is the object from the lens?

A. 10m
B. 20m
C. 30m
D. 40m
E. 60m

Question 38 :

• WAEC 1990

Which of the following pairs of light rays shows the widest separation in the spectrum of white light?

A. Yellow and red
B. Orange and green
C. Violet and blue
D. Blue and green
E. Red and indigo

Question 39 :

• WAEC 1990

Given that the gravitational constant is 7 X 10^-11 Nm2kg^-2, what is the force of attraction between 10⁶kg mass of lead hanging one metre away from a 10³kg mass of iron?

A. 7 x10^-20N
B. 7 x 10^-5N
C. 7x10^-2N
D. 7x10³N
E. 7x10⁰N

Question 40 :

• WAEC 1990

Calculate the current in the 3Ω resistor shown in
the diagram above.

A. 3.0A
B. 4.0A
C. 4.3A
D. 12.0A
E. 39.0A