2004 - WAEC Physics Past Questions and Answers - page 4
31
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
correct option: b
Users' Answers & Comments32
A magnified and virtual image of a near object is produced by
A
prism binoculas
B
astronomical telescope
C
periscope
D
simple microscope
correct option: d
Users' Answers & Comments33
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
34
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
correct option: c
Users' Answers & Comments35
The sound from a vibrating tuning sound is when the tip of its stem is placed on a wooden table than when in air because
A
the friction between the table and the tuning fork generates additional energy
B
air molecules obsorb sound wave but wood transmit sound waves
C
the table increases the frequency of the turning fork
D
a large mass of air is set into vibration by the table
correct option: d
Users' Answers & Comments36
Charges on a conductor are
A
evenly distributed over a surface of any shape
B
concentrate on the inner surface of the conductor
C
concentrate at the outer flat surface of the conductor
D
generally concentrated at sharply curved surface
correct option: d
Users' Answers & Comments37
Which of following functions is performed by manganese IV oxide in the Lenclanche cell?
A
control of local action
B
depolarisation of the cell
C
regulating current flow in the cell
D
reduction of the internal resistance of the cell
correct option: b
Users' Answers & Comments38
A car fuse marked 3A operates optimally on a 12V battery, calculate the resistance of the fuse
A
36.0\(\Omega\)
B
15.0\(\Omega\)
C
9.0\(\Omega\)
D
4.0\(\Omega\)
39
Find the cost of running a 60W lamp for 24 hours. If 1kW hr cost 5 naira
A
14.4 naira
B
12.5 naira
C
7.2 naira
D
2.0 naira
correct option: c
Cost = P(Kwh) x Cost per KW
= \(\frac{60 \times 24}{1000} \times N5 = N7.2\)
Users' Answers & Comments= \(\frac{60 \times 24}{1000} \times N5 = N7.2\)
40
The quantity of electric charge stored in a capacitor is measured in
A
farad
B
ampere
C
coulomb
D
volt
correct option: c
Users' Answers & Comments