A stone is dropped into the middle of a pool of water. Which of the following statements is/are correct? I, Spherical waves are set up in the water. II. The water moves outwards to the sides of the pool. III. Energy is transmitted outwards from the centre of disturbance
AI only
BII only
CIII only
DI and III only
EII and III only.
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Question 2002
waec1990
Which of the following is/are necessary for the production of interference with two wave trains? I. The sources must be close to each other. II The waves must have the same frequency. III. The waves must have the same amplitude. IV. The waves must travel with the speed of light.
AI, II and IV only
BI, II and III only
CI and II only
DII, III and IV only
El, III and IV only
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Question 2003
waec1990
The diagram above represents part of a wave motion in air. If the wave travels with a speed of 300ms-1calculate the frequency of the wave.
A360Hz
B300Hz
C250Hz
D150Hz
E100Hz
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Question 2004
waec1990
Which of the following is/are characteristics of sound? I Pitch II. Loudness III. Quality IV Noise
AI only
BII only
CI and II only
Dl, II and III only
EI, II, III and IV
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Question 2005
waec1990
A tuning fork sounds louder when its stem is pressed against a table top than when held in air because
Aa larger mass of air is set vibrating by the table top
Bthe whole table vibrates in resonance
Cthe whole table has acquired a larger frequency
Dthe fork and table have the same frequency
Ethe amplitude of the vibrating fork is increased.
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Question 2006
waec1990
A bat emits a sound wave at a speed of 1650.0ms-1 and receives the echoes 0.15s later. Calculate the distance of the bat from the reflector
A8.75m
B16.50m
C87.75m
D123.75m
E330.00m
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Question 2007
waec1990
When the direction of vibration of the particles of a medium is perpendicular to the direction of travel of a wave the wave transmitted is known as
Asound wave
Btransverse wave
Clongitudinal wave
Dstationary wave
Emechanical wave
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Question 2008
waec1990
Which of the following is not a suitable method for reducing loss of heat from a piece of hot iron?
AWrapping it in cotton wool
Bpainting it black
CPlacing it in a vacuum
DPlacing it on rubber supports
EKeeping it in a closed wooden box
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Question 2009
waec1990
Heat transfer by convection in a liquid is due to the
Atranslatory motion of the molecules of the liquid
Bincreased vibration of the molecules of the liquid about their mean positions
Cexpansion of the liquid as it is heated
Dlatent heat of vaporization of the liquid
Eability of the liquid to evaporate at all temperatures
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Question 2010
waec1990
How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg-1k-1 cools from 85oC to 25oC?
A1.38 x 106 J
B2.53x104J
C7.66x103J
D1.38x103J
E1.27 X103J
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Question 2011
waec1990
lf the temperature of a small quantity of water in a closed container is gradually increased from 0o to 40oC then the density of the water within this range
Aincreases for a while and then decreases
Bdecreases for a while and then increases
Cincreases gradually
Ddecreases gradually
Eremains the same
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Question 2012
waec1990
Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise higher than that of Y only if the
Avolume of P is greater than that of Q
Bspecific heat capacity of P is higher than that of Q
Cdensity of P is greater than that of Q
Ddensity of P is lower than that of Q
Especitic heat capacity of P is lower than that of Q.
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Question 2013
waec1990
Dry hydrogen is trapped by pellet of mercury in a uniform capillary tube closed at one end. If the length of the column of hydrogen at 27°C is 1.0m, at what temperature will the length be 1.20m?
A22.5oC
B32.4oC
C77.0oC
D87.0oC
E360.0oC
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Question 2014
waec1990
A cube made of a metal of linear expansivity is warmed through a temperature of t. lf the initial volume of the cube is V what is the increase in volume of the cube?
A1/3α Vt
B1/2α Vt
Cα Vt
D2α Vt
E3α Vt
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Question 2015
waec1990
The absolute zero temperature is defined as the temperature at which
Athermal motion ceases
Bthe temperature of a gas is 273oC
Cice melts
Dthe volume of a real gas is maximum
Ethe pressure of a real gas is maximum
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Question 2016
waec1990
An object weighs 10.0 N in air and 7.0 N in water. What is its weight when immersed in a liquid of relative density 1.5?
A4.50N
B4.67N
C5.50N
D6.67N
E8.50N
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Question 2017
waec1990
The body P shown in the diagram above is in equilibrium. If the mass Q of the body is 10kg, calculate the tension T in the string. (Take g = 10ms2)
A20/√3N
B20N
C50N
D200√3N
E200N
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Question 2018
waec1990
A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?
A0.02s
B0.20s
C0.83s
D1.20s
E50.00s
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Question 2019
waec1990
An object R leaves a platform XY with a horizontal velocity of 7m-1 and lands at Q. lf it takes the same object 0.3s to fall freely from Y to P, calculate the distance PQ.(Take g = 1Oms2)
A7.30m
B2.55m
C2.10m
D1.65m
E0.45m.
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Question 2020
waec1990
A force F is applied to a body P as shown in the diagram above. If the body P moves through a distance r, which of the following represents the work done?
