Waec Physics 2004 Past Questions and Answers

Question 31:

• WAEC 2004

A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m. Calculate the height of the image of the man produced by the camera

A. 0.18m
B. 0.50m
C. 1.62m
D. 18.00m

Question 32:

• WAEC 2004

During a thunderstorm, lightning and thunder occurred simultaneously in the atmosphere. An observer on the earth surface's sees the lightning flash shortly before hearing the thunder. This is because the

A. Atmospheric pressure is higher at the surface than at the higher altitudes
B. Speed of sound is less than that of light
C. Temperature of the atmosphere decreases with altitude
D. Atmospheric density decreases with altitude

Question 33:

• WAEC 2004

A magnified and virtual image of a near object is produced by

A. Prism binoculas
B. Astronomical telescope
C. Periscope
D. Simple microscope

Question 34:

• WAEC 2004

A girl stand 80m away from a tall cliff and blows a whistle. If the speed of sound in air is 330ms^-1, how long would it take for her to hear the echo of the sound?

A. 2.062s
B. 0.970s
C. 0.485s
D. 0.242s

Question 35:

• WAEC 2004

Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To

A. Increase the intensity of sound waves
B. Increases the loudness of the sound waves
C. Reduce the effect of revibration of sound waves
D. Decreases thr frequency of sound waves