Waec Physics 2011 Past Questions and Answers

Question 31:

• WAEC 2011

The focal length of the eye-piece of an astronomical telescope is f₁, while the focal length of the object is f₂. Fro normal adjustment, the angular magnification is given by

A. \(\frac{f_2}{f_1}\)
B. 1 - \(\frac{f_2}{f_1}\)
C. \(\frac{f_2}{f_1}\) - 1
D. \(\frac{f_1}{f_2}\)

Question 32:

• WAEC 2011

two sound waves have frequencies of 12Hz and 10Hz. Calculate their beats period

A. 0.5s
B. 1.0s
C. 1.2s
D. 2.0s

Question 33:

• WAEC 2011

The main difference between echo and reverberation is that

A. Reverberation is reflected sound while echo is refracted sound
B. The time interval between incident sound and reflecte sound is shorter for reverbration
C. The amplitude of an echo is greater
D. Reverberation is from acoustic speakers while echo comes from clifts

Question 34:

• WAEC 2011

Which of the following statements about the electromagnetic waves is correct?

A. Radio waves have longer frequencies than x-rays
B. X-rays have the longest wavelength
C. Some of the waves travel at 3.0 x 10⁸ms^-1
D. White light occupies a region beyond ultraviolet rays

Question 35:

• WAEC 2011

The correct relationship between "G" and "g" in a gravitational field is given by the equation (Where the symbols have their usual meanings)

A. G = \(\frac{GM}{R}\)
B. G = \(\frac{GM}{R^2}\)
C. G = \(\frac{GM^2}{R}\)
D. G = \(\frac{GM^2}{R^2}\)