Two identical cells each of e.m.f 2v and internal resistance 1.0\(\Omega\) are connected in parallel. The combination is connected to an external load of 1.5\(\Omega\). Calculate the current in the circuit
A0.57A
B1.00A
C1.14A
D2.00A
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Question 32
waec2003
A positively charged glass rod is placed by near the cap of a positively charge electroscope. The divergence of the leaf is observed to
Adecrease
Bincrease
Cremain the same
Dincrease and collapse immediately
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Question 33
waec2003
Which of the following statement about force is correct ?
Aelectrostatic, gravitational and magnetic forces are always attractive
Belectric, gravitational and magnetic field obeys inverse square law
Cfields are real but their corresponding field lines are imaginary
Dfield lines and their corresponding fields are both real
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Question 34
waec2003
Which of the following features of an electrostatic line of force is not correct?
Ait is an imaginary line which a positive charge will describe if it is free to move
Bthe tangent drawn at any point on a curved line of force shows the direction of the electric field intensity at that point
Cit is sometimes curved
Dit can cross another line of force in a region of intense electric field
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Question 35
waec2003
Which of the following instruments gives a pure note when sounded?
Atalking drum
Bsiren
Ctunning fork
Dguitar
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Question 36
waec2003
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 37
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 38
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 39
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 40
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 41
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 42
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 43
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 44
waec2003
The image which cannot be formed on a screen is said to be
Ainverted
Berect
Creal
Dvirtual
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Question 45
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 46
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 47
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 48
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 49
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 50
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
