2002 - WAEC Physics Past Questions and Answers - page 4
31
When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon can be called
A
beats
B
diffraction
C
overtones
D
resonance
correct option: a
Users' Answers & Comments32
Which of the following instruments is not a wind instrument?
A
clarinet
B
saxophone
C
trumpet
D
xylophone
correct option: d
Users' Answers & Comments33
Which of the following actions will not cause an increase in the frequency of a vibrating string?
A
increasing the tension of the string
B
decrease the mass per unit lengthof the string
C
decrease the length of the string
D
increasing the cross sectional area of the string
correct option: d
Users' Answers & Comments34
Which of the following items can be used to compare the relative magnitudes of electric charges on two bodies?
A
ebonite rod
B
gold leaf electroscope
C
proof plane
D
the electrophorus
correct option: b
Users' Answers & Comments35
Three capacitors each of capacitance 18\(\mu F\) are connected in series. Calculate the effective capacitance of the capacitors
A
54.00\(\mu F\)
B
18.00\(\mu F\)
C
6.00\(\mu F\)
D
0.17\(\mu F\)
correct option: c
\(\frac{1}{c} = \frac{1}{18} + \frac{1}{18} + \frac{1}{18} = \frac{3}{18}\)
c = 6\(\mu F\)
Users' Answers & Commentsc = 6\(\mu F\)
36
Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. [G = 6.70 x 10-11Nm-2kg-2]
A
6.70 x 10-11N
B
6.70 x 10-10N
C
6.03 x 10-11N
D
6.03 x 10-7N
correct option: d
F = \(\frac{Gm_1m_2}{r^2} = 6.7 \times 10^{11} \times \frac{100 \times 90}{1^2} = 6.03 \times 10^{-7}N\)
Users' Answers & Comments37
The magnitude of the gravitational attraction between the earth and a particle is 40N. If the mass of the particle is 4kg. Calculate the magnitude of the gravitational field intensity of the earth on the particle
A
10.0N kg-1
B
12.6N kg-1
C
25.0N kg-1
D
160.0N kg-1
38
Local actions is normally prevented in a simple electric cell by
A
introducing an oxidizing agent in the acid
B
not drawing current continously for long period
C
amalgamating the surface of the zinc plate
D
using a porous pot to isolate the zinc plate from the acid
correct option: c
Users' Answers & Comments39
The lead-acid accumulator consists of a
A
lead as the positive electrode
B
lead ocide as the negative electrode
C
hydrochloric acid as the electrolyte
D
tetraoxosulphate(VI) acid as the electrolyte
correct option: d
Users' Answers & Comments40
Which of the following actions will not lead to an increase in the induced e.m.f. in a coil of wire rotating between the poles of a magnet? Increasing the
A
strength of the magnet
B
number of turns in the coil
C
speed of location in the coil
D
gap between the poles of the magnet
correct option: d
Users' Answers & Comments