A sonometer wire of linear density 0.08kg m-1 subjected to a tension of 800N is plucked. Calculate the speed of a pulse which moves from one end of the wire to the other
A179.0ms-1
B100.0ms-1
C15.8ms-1
D8.0ms-1
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Question 12
waec2003
The speed of sound in air is is directly proportional to
Aits temperature on the celsius scale
Bite temperature in the thermodynamic scale
Cthe cube root of its temperature on its celcius csale
Dthe square roor of its temperature on the absolute scale
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Question 13
waec2003
Which of the following statements about the human eye and the camera is correct?
Aboth form virtual image of objects
Bthe image formed by the eye is upright in the retina while that formed by the camera is inverted on the film
Cthe inside of both of them is blackened to absorb unwanted light
Dthe focal length of both eye lens and the camera lens can be varied
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Question 14
waec2003
Which of the following pairs of rays shows the widest separation in the spectrum of white light?
Agreen and blue
Borange and indigo
Cblue and violet
Dred and yellow
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Question 15
waec2003
A converging lens has a focal length of 5cm. Determine its power
A+20.0
B+0.2
C-20.00
D-0.2
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Question 16
waec2003
The horizontal floor of a water reservoir appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.35, calculate the real depth of the reservoir
A2.35m
B1.35m
C1.00m
D0.35m
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Question 17
waec2003
A converging lens produces an image four times as large as an object placed 25cm from the lens. Calculate its focal length
A100cm
B33cm
C29cm
D20cm
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Question 18
waec2003
An object is placed on the principal axis and at the centre of curvature of a concave mirror, the image of the image formed by the mirror is
Areal and magnified
Breal and inverted
Cerect and magnified
Derect and virtual
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Question 19
waec2003
The image which cannot be formed on a screen is said to be
Ainverted
Berect
Creal
Dvirtual
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Question 20
waec2003
Which of the following condition is necessary for the occurrence of total internal reflection of light?
Alight must travel from an optical less dense to a denser medium
Bthe angle of incidence must be equal to the critical angle
Cthe angle of incidence must be greater than the critical angle
Dthe angle of refraction must be 90o
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Question 21
waec2003
A wave of wavelength 0.30m travels 900m in 3.0s. Calculate its frequency
A68.0Hz
B225.0Hz
C1000Hz
D750.0Hz
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Question 22
waec2003
The volume of a given mass of an ideal gas at 327k and 9.52 x 104 Pa is 40cm3. calculate the volume of the gas at 273k and 1.034 x 105Pa.
A68.23cm3
B47.91cm3
C44.60cm3
D30.75cm3
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Question 23
waec2003
When the pressure of a fixed mass of gas is doubled at constant temperature, the volume of the gas is
Aincreased four times
Bdoubled
Cunchangeable
Dhalved
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Question 24
waec2003
Which of the following statement about latent heat of vaporization is correct? It
Aweakens the adhesive force between molecules of a liquid and those of its container
Bbreaks completely the force of attraction completely between the molecules of a liquid
Cadd to the heat content of a liquid
Dincreases the cohesive forces between liquid molecules
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Question 25
waec2003
The heat capacity of a calorimeter is the amount of energy required to
Achange the temperature of 1kg of the calorimeter by 1k
Bchange 1kg mass of the calorimeter to liquid at the same temperature
Cchange the temperature of the calorimeter
Dmelt the calorimeter into liquid at a constant temperature
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Question 26
waec2003
A metal rod of length 100cm is heated through 100ºC, calculate the change in length of the rod [linear expansivity of the material of the rod is 3 x 10\(^{-5}\)K\(^{-1}\)]
A4mm
B3mm
C2mm
D1mm
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Question 27
waec2003
A platinum resistance thermometer has a resistance 4\(\Omega\) at 0oC and 10\(\Omega\) at 100oC. Assuming the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45oC.
A14.0\(\Omega\)
B6.7\(\Omega\)
C3.2\(\Omega\)
D2.7\(\Omega\)
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Question 28
waec2003
Which of the following statements correctly defines a simple machine? a device
Athat can provide electric current
Bwhich can only carry people from one place to another
Cwith which work can be done easily
Dwhich changes the state of rest or of uniform motion of an object along a straight ine
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Question 29
waec2003
A ball f mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms-1. Determine the magnitude of the resulting impulse
A2.0kgms-1
B10.0kgms-1
C5.0kgms-1
D2.5kgms-1
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Question 30
waec2003
The mass on a loaded spiral spring oscillates vertically between two extreme positions P and R equidistant from the equilibrium position Q. Which of the following statements about the system is not correct
Athe momentum of the mass is maximum at Q
Bthe elastic potential energy of the spring is maximum at Q
Cthe kinetic energy of the mass is maximum at P
Dthe total energy of the system is always constant
