2011 - WAEC Physics Past Questions and Answers - page 4
31
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
correct option: a
\(f_1 - f_2 = \frac{1}{T}\)
12 - 10 = \(\frac{1}{2}\)
= 0.5
Users' Answers & Comments12 - 10 = \(\frac{1}{2}\)
= 0.5
32
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
correct option: b
Users' Answers & Comments33
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
correct option: c
Users' Answers & Comments34
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 = \(\frac{GM^2}{R^2}\)
correct option: b
Users' Answers & Comments35
The capacitance of a parallel-plate capacitor
A
decreases when the seperation between the plate decreases
B
increases when the optential difference between the plates is increased
C
is greater without a dielectric material between the plates than with a dielectric
D
is greater with a dielectric between the plates than without a dielectric.
correct option: d
Users' Answers & Comments36
When the pointed end of an uncharged optical pin is brought near the cap cf a positively charged electroscope, it is observed that the gold
A
collapse slowly
B
vibrate
C
are not affected
D
diverge rapidly
correct option: a
Users' Answers & Comments37
Which of the following substances does not conduct electricity?
A
graphite
B
glass
C
sulphuric acid
D
table salt solution
correct option: b
Users' Answers & Comments39
An ammeter with a full scale deflection of 10mA has an internal resistance 0.5\(\Omega\). calculate the resistance of the shunt required to adapt it to read up to 3A
A
0.0167\(\Omega\)
B
0.0130\(\Omega\)
C
0.0250\(\Omega\)
D
0.1000\(\Omega\)
correct option: a
\(R_2 = \frac{I_1R_1}{I_2} = \frac{0.01 \times 5}{2.99}\)
= 0.0167
Users' Answers & Comments= 0.0167
40
The resistivity, \(\mathit{P}\), of a material of length l, cross-sectional area A, resistance R, is given by the equation
A
\(\mathit{P} = \frac{RA}{l}\)
B
\(\mathit{P} = \frac{l}{RA}\)
C
\(\mathit{P} = \frac{Rl}{A}\)
D
\(\mathit{P} = \frac{R}{Al}\)
correct option: a
Users' Answers & Comments