The diagram above shows the speed-time graph of a car.If the car covered a total distance of 600m in 25s, calculate its maximum speed
A30ms-1
B25ms-1
C20ms-1
D15ms-1
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Question 3
waec2006
An atom \(^{234}_{91} P\) emits a gamma radiation. The resultant nuclide is
A\(^{230}_{90} Th\)
B\(^{234}_{91} Pa\)
C\(^{234}_{90} Th\)
D\(^{234}_{89} Ac\)
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Question 4
waec2006
Fusion is not usually used for generating electric power because
Ano energy is released when fusion takes place
Bvery high temperatures are required to initiate fusion reaction
Cthe raw materials needed is not easily available
Dheavy nuclei are involved
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Question 5
waec2006
A radioactive substance of mass 768g has a half life of 3 years. After how many years does this substance leave only 6g undecayed?
A21
B18
C15
D12
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Question 6
waec2006
A 500kV is applied across an X-ray tube. Calculate the maximum velocity of the electrons produced [Me = 9.1 x 10\(^{-31}\)kg, e = 1.6 x 10\(^{-19}\)C]
A4.2 x 108ms-1
B1.9 x 108ms-1
C4.2 x 105ms-1
D1.8 x 105ms-1
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Question 7
waec2006
The breaking up of an atomic nucleus into the fragment of nearly equal size is known as
Anuclear fusion
Bnuclear fission
Cthermonuclear reaction
Dnatural radioactivity
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Question 8
waec2006
The force experienced by a current-carrying conductor move in a magnetic field is employed in the working of the i. moving coil ammeter ii. electric bell iii. electric motor. Which of the statements above are correct?
Ai and ii only
Bii and iii only
Ci and iii only
Di, ii and iii
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Question 9
waec2006
Which of the following statements about a bar magnet is correct?
Airon fillings cling uniformly along the length of a bar magnet
Bthe magnetic properties are more pronounced at the middle of a magnet
Cit is impossible to have the same poles at the end of a magnet
Dthe magnetic properties are more pronounced at points near the end of the bar
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Question 10
waec2006
An electric lamp rated 120W is used on a 240Vrms, calculate the resistance of its filament
A480\(\Omega\)
B360\(\Omega\)
C60\(\Omega\)
D2\(\Omega\)
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Question 11
waec2006
a cell of e.m.f. 1.5V and internal resistance 1.0\(\Omega\) is connected to two resistor of resistance 2.0\(\Omega\) and 3.0\(\Omega\) in series. Calculate the current through the resistors
A0.25A
B0.30A
C0.35A
D0.50A
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Question 12
waec2006
The equivalent capacitance of a 3\(\mu F\) capacitor and a 6\(\mu F\) capacitor connected in parallel is
A2.0\(\mu F\)
B3.0\(\mu F\)
C4.5\(\mu F\)
D9.0\(\mu F\)
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Question 13
waec2006
Which of the following factors does not affect the capacitance of a parallel plate capacitor?
Aarea of the plates
Bnature of the surface of the plates
Cdistance of separation between the plates
Dnature of the insulating material between the plates
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Question 14
waec2006
An electron of mass m and charge \(\Box\) enters a uniform electric field between two metal plates P and q separated by a distance d. P is maintained at a potential V while Q is earthed. Determine an expression for the magnitude of the acceleration of electron through the field
A\(\frac{eV}{md}\)
B\(\frac{d}{meV}\)
C\(\frac{md}{eV}\)
D\(\frac{e}{Vmd}\)
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Question 15
waec2006
The acceleration due o gravity may be defined as the force
Aof attraction of the sun and on the earth
Bwith which the earth revolves around the sun
Cwith which the earth attracts one kilo-gram mass
Dof the moon on the earth
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Question 16
waec2006
Which of the following actions is necessary in order to tune a string to produce a note of an octave higher than its fundamental?
Adoucling the length of the string
Breducing the tension by half
Creducing the mass per unit length
Dincreasing the tension four times
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Question 17
waec2006
In which of the following media would sound wave travel fastest?
Awood
Bwater
Ciron
Dmercury
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Question 18
waec2006
A travelling microscope is focused on a mark on a table. If a glass block of thickness 18.0cm is placed on the mark by how many centimeters will the microscope be moved upwards so as to focus the mark once again? [refractive index of glass = 1.5]
A27cm
B24cm
C9cm
D6cm
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Question 19
waec2006
Which of the following distances is usually adjustable in the camera? The distance between the
Alens and the film
Bdiaphragm and the shutter
Cshutter and the film
Ddiaphragm and the film
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Question 20
waec2006
A ray from a fixed object is incident on a plane mirror at an angle of 20o. If the mirror is rotated through 30o by how many degree would the reflected ray rotate?
