Waec Physics 1997 Past Questions and Answers

Question 36:

• WAEC 1997

A progressive wave has a wavelength of 50cm. calculate the phase difference between two points at a distance of 20cm apart.

A. 10/3π
B. 5/2 π
C. 4/5 π
D. 2/3 π
E. π/3

Question 37:

• WAEC 1997

An alternating current with a peak value of 5A passes through a resistor of resistance 10Ω. Calculate the rate at which energy is dissipated in the resistor

A. 250W
B. 125W
C. 50W
D. 35.4W
E. 12.5W

Question 38:

• WAEC 1997

The invisible part of the spectrum of a white light consists of the following colors

A. Red, orange and yellow only
B. Infra-red, ultraviolet and blue only
C. Indigo and green only
D. Violet and red only
E. Ultra violet and infra-red only

Question 39:

• WAEC 1997

Which of the following is not true of the similarities between a camera and the human eye?

A. Both the camera and the human eye have light proof interiors
B. Both the camera and the human eye have light sensitive screens
C. Inverted images are formed on the screen in both
D. The distance between the lens and the screen is fixed in both
E. The amount of light entering both the eye and the camera can be adjusted

Question 40:

• WAEC 1997

The magnification produced with a converging lens is 5. If the object is a square wire gauze of side 2cm, calculate the area of the image

A. 100\(cm^3\)
B. 40\(cm^3\)
C. 20\(cm^3\)
D. 10\(cm^3\)
E. 4\(cm^3\)