An object is placed 10cm in front of a plane mirror. If it is moved 8cm away father away from the mirror, determine the distance of the final image from the mirror
A2cm
B9cm
C16cm
D18cm
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Question 12
waec2007
Which of the following phenomena is not a direct consequence of rectilinear propagation of light?
Alunar and solar eclipses
Bimages of objects in a pin hole camera
Cdiffraction of light
Dshadows of opaque object
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Question 13
waec2007
The distance between two points P and Q, along a wave is 0.05m. If the wave length of the wave is 0.10m, determine the phase angle between P and Q in radians
A0.1\(\pi\)
B\(\pi\)
C2\(\pi\)
D10\(\pi\)
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Question 14
waec2007
Which of the following wave is electromagnetic?
Ax-rays
Bsound waves
Cwater waves
Dtidal waves
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Question 15
waec2007
The pressure of a fixed mass of an ideal gas at 27°C is 3 pa. The gas is heated at a constant volume until its pressure is 5 pa. Determine the new temperature of the gas.
A100oC
B227oC
C273oC
D500oC
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Question 16
waec2007
According to the kinetic theory of gasses, which of the following property of a gas can be affected by the collision of the gas molecule with the walls of the container?
Atemperature
Benergy
Cviscosity
Dpressure
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Question 17
waec2007
A body of mass 200g and specific heat capacity 0.4Jg-1k-1 cools from 37oC to 31oC. Calculate the quantity of the heat released by the body.
A4800J
B1200J
C480J
D202J
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Question 18
waec2007
A relative density bottle of volume 50cm3 is completely filled with a liquid at 30oC. It is then heated to 80oC such that 0.75cm3 of the liquid is expelled. Calculate the apparent cubic expansivity of the liquid.
A0.00030k-1
B0.00032k-1
C0.01970k-1
D0.02030k-1
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Question 19
waec2007
A cube made of metal of linear expansivity \(\alpha\) is heated through a temperature \(\theta\). If the initial volume of the cube is Vo, the correct expression for the increase in volume of the cube is
A\(\frac{1}{3} \alpha V_o \theta\)
B\(\frac{1}{2} \alpha V_o \theta\)
C\(2 \alpha V_o \theta\)
D\(3 \alpha V_o \theta\)
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Question 20
waec2007
Which of the following statements distinguishes thermal conduction for convection? i. Conduction requires a material medium while convection does not ii. In convection, there is actual motion of hot material, while in conduction, molecules molecules vibrates faster about their mean positions iii. Conduction takes place in solids while convection takes place in fluids.
Ai and ii only
Bii and iii only
Ci and iii only
Di, ii and iii
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Question 21
waec2007
The ice and steam point on a mercury-in-glass thermometer are 10cm and 30cm respectively. Calculate the temperature in decree Celsius when the mercury meniscus is the 14cm mark
A20oC
B30oC
C34oC
D70oC
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Question 22
waec2007
Which of the following surfaces will radiate heat energy best?
ARed surface
Bwhite surface
Cblack surface
Dyellow surface
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Question 23
waec2007
Mechanical energy can be either
Akinetic or electric
Bchemical or potential
Cpotential or kinetic
Delectric or heat
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Question 24
waec2007
A plane inclined at 30o to the horizontal has an efficiency of 50%. Calculate the force parallel to the plane required to push a load of 120N uniformly upn the plane
A50.0N
B120.0N
C200.0N
D240N
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Question 25
waec2007
A car of mass 800kg moves from rest on a horizontal track and travels 60m in 20s with uniform acceleration. Assuming there were no frictional forces, calculate the accelerating force
A240.0N
B800.0N
C1600.00N
D2400.0N
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Question 26
waec2007
An external force of magnitude 100N acts on a particle of mass 0.15kg for 0.03s. Calculate the change in the speed of the particle
A50ms-1
B25ms-1
C20ms-1
D5ms-1
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Question 27
waec2007
A block of mass 4.0kg causes a spiral spring to extend by 0.16m from its unstretched position. The block is removed and another body of mass 0.50kg is hung from the same spiral spring. If the spring is then stretched and released, what is the angular frequency of the subsequent motion? [g = 10 ms -2]
A10\(\sqrt 5\) rads-1
B5\(\sqrt 2\) rads-1
C5 rads-1
D\(\sqrt 5\) rads-1
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Question 28
waec2007
A swinging pendulum between the rest position and its maximum displacement possesses
AKinetic energy only
Bpotential energy only
Cgravitational energy only
Dboth kinetic and potential energy
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Question 29
waec2007
A body accelerates uniformly from rest at 2ms-2. Calculate the magnitude of its velocity after travelling 9m
A4.5 ms-1
B6.0ms-1
C18.0-1
D36.0-1
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Question 30
waec2007
A body moving with an initial velocity U accelerates until it attains a velocity of V within a time t. The distance, s covered by the body is given by the expressions
