2010 - WAEC Physics Past Questions and Answers - page 4
31
Which of the following electromagnetic wave has the longest wavelength?
A
radio-waves
B
gamma rays
C
infrared waves
D
ultraviolet rays
correct option: a
Users' Answers & Comments32
The amplitude of a sound wave determines its
A
frequency
B
quality
C
loudness
D
pitch
correct option: c
Users' Answers & Comments33
As the air column of length L in an air pipe decreases, the frequency of the sationary wave emitted
A
decreases
B
increases
C
varies as L2
D
varies as \(\sqrt{L}\)
correct option: a
Users' Answers & Comments34
A positively charged glass rod is placed near the cap of a positively charged electroscope. The divergence of the leaf is observed to
A
decrease
B
increase
C
remain the same
D
increase and collapse immediately
correct option: b
Users' Answers & Comments35
Capacitors are used in the following devices, except
A
water pumping machines
B
ceiling fans
C
electric irons
D
television sets
correct option: c
Users' Answers & Comments36
Use the diagram above to calculate the current, I.
A
0.60A
B
0.97A
C
1.03A
D
5.00A
correct option: b
\(\frac{1}{R} = \frac{1}{R_1} + \frac{1}{R_2}\)
= \(\frac{1}{6} + \frac{1}{4}\)
R = \(\frac{12}{5} = 2.5\Omega\)
R = 2.4 + 10 = 12.4
V = IR
I = \(\frac{v}{R} = \frac{12}{12.4} = 0.97\)
Users' Answers & Comments= \(\frac{1}{6} + \frac{1}{4}\)
R = \(\frac{12}{5} = 2.5\Omega\)
R = 2.4 + 10 = 12.4
V = IR
I = \(\frac{v}{R} = \frac{12}{12.4} = 0.97\)
37
Determine the potential difference. V across the parallel resistors
A
2.0V
B
2.3V
C
3.0V
D
0.7V
38
A galvanometer of internal resistance 50\(\Omega\) and full scale deflection of 20 mA is converted into a voltmeter by connecting a resistor of resistance 1950\(\Omega\) in series to it. Calculate the maximum voltage that can be read by the voltmeter
A
20V
B
30V
C
38V
D
40V
39
In the wiring of houses, the fuse is connected to the wire coloured
A
blue
B
brown
C
yellow
D
yellow and green
correct option: b
Users' Answers & Comments40
Which of the following factors does not affect the electric resistance of wire?
A
length
B
mass
C
temperature
D
cross-sectional area
correct option: b
Users' Answers & Comments