WASSCE PHYSICS MAY/JUNE 2006 (SSCE WAEC MAY/JUNE 2006 PHYSICS))
1. Which of the following phenomena causes capillarity of liquids in tubes to narrow bore
A. Viscosity
B. Surface tension
C. Osmosis
D. Brownian motion
2. Which of the following physical quantities are derived
I. Area
II. Thrust
III. Pressure
III. Mass
A. I, II, III and IV
B. I,II and III only
3. A block of volume 3×105m3 and density 2.5×103kgm–3 is suspended from a spring balance with $\frac{2}{3}$ of its volume immersed in a liquid of density 900kgm–3. Determine the reading of the spring balance
[g =10ms–1]
A. 0.18N
B. 0.57N
C. 0.75N
D. 0.93N
4. A solid body will float in a liquid if its
A. density is less than that of the liquid
B. mass is equal to that of the liquid
C. density is greater than that of the liquid
D. mass is less than that of the liquid
5. An object is said to undergo oscillatory motion when it moves
A. in erratic manner
B. to and fro about a fixed point
C. in a circular path
D. along a continuous path from the starting point
6. A moving car of mass 800kg experiences a frictional force of 200N. If it accelerates 2ms–1, calculate the magnitude of the force applied to the car.
A. 600N
B. 1000N
C. 1600N
D. 1800N
7. A body is rotating in a horizontal circle of radius 2.5m with an angular speed of 5rad s–1. Calculate the magnitude of the radial acceleration of the body
A. 62.50ms–2
B. 31.25ms–2
C. 12.50ms–2
D. 10.00ms–2
8. Uniform speed occurs when there is equal change of
A. distance in equal times
B. displacement in equal times
C. velocity in equal times
D. acceleration in equal times
9. A car accelerates uniformly from rest at 5ms–2. Determine its speed after 10s.
A.50.0ms–1
B. 25.0ms–1
C.2.0ms–1
D. 0.5ms–1
10.
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
A. 30ms–1
B. 25ms–1
C. 20ms–1
D. 15ms–1
11. Which of the following quantities is vector
A. Speed
B. Distance
C. Energy
D. Momentum
12.
Determine the magnitude of P in the diagram above
A. 16N
B. 20N
C. 32N
D. 40N
13. Which of the following statement about simple harmonic motion is correct? The
A. Total mechanical energy is always conserved
B. linear acceleration is directed to any variable point
C. linear acceleration varies inversely with displacement
D. period of oscillation varies linearly as acceleration due to gravity
14. A force acting on a body causes a change in the momentum of the body from 12kgms–1 to 16kgms–1 in 0.25. Calculate the magnitude of the impulse
A. 28.0Ns
B. 20.0Ns
C. 4.0Ns
D. 0.8Ns
15. Which of the following sources of energy is renewable
A. Petroleum
B. Charcoal
C. Hydro
D. Nuclear
16. A stone of mass 2.0kg is thrown vertically upward with a velocity of 20.0ms–1. Calculate the initial kinetic energy of the stone.
A. 200J
B. 400J
C. 600J
D. 1600J
17. Which of the following statement about the mouth piece of a telephone is correct? It converts sound energy into
A. Acoustic energy
B. mechanical energy
C. electrical energy
D. heat energy
18. The potential energy in an elastic string of force constant k which has been extended by x metres is expressed as
A.$\tfrac{1}{2}k{{x}^{2}}$
B. $k{{x}^{2}}$
C.$\tfrac{1}{2}kx$
D. $kx$
19.The engine of a train a force of 3000 when moving at 30ms–1. Calculate the power of the engine
A. 1.00×102W
B.3.00×104W
C.9.00×104W
D. 3.00×105W
20. The velocity ratio of an inclined plane, inclined at an angle θ to the horizontal can be expressed as
A. (sin θ)–1
B. sin θ
C. (cos θ)–1
D. cos θ
21. A block and tackle system has six pulleys. A force of 50N applied to it lifts a load of weight W. If the efficiency of the system is 40%, calculate W
A. 300N
B. 200N
C. 140N
D. 120N
22. The sagging of overhead electrical cables is the consequences of
A. linear expansivity
B. superficial expansivity
C. cubic expansitivity
D. conductivity
23.The silvered surface in a vacuum flask reduces heat loss due to
A. conduction
B. convection
C. radiation
D. evaporation
24. How long will it take t heat 3kg of water from 28oC to 88oC in an electric kettle taking 6Afrom 220V supply? [Specific heat capacity of water = 4180Jkg–1K–1]
A. 120s
B. 570s
C. 600s
D. 836s
25. The amount of energy required to change a kilogram of ice block into water without a change in temperature is
A. heat capacity of ice
B. specific heat capacity
C. Specific latent heat of vaporization of ice
D. specific latent heat of fusion
26. A quantity of steam at 100oC condenses to water at the same temperature by releasing 6.9×104J of energy. Calculate the mass of the condensed steam [Specific latent heat of vaporisation of water = 2.3×106Jkg–1]
A. 3.0×10–1kg
B. 3.0×10–2kg
C. 3.0×10–3kg
D. 3.0×10–4kg
27. The temperature of a liquid falls after some of it has evaporated because
A. the liquid left is smaller in volume and the breeze easily
B. the more energetic molecules have escape into the atmosphere
C. the liquid left has less latent heat
D. after evaporation impurities are left behind
28. The SI unit of frequency, period, and amplitude of a wave are respectively
A hertzs, second and metres
B. second, metre and hertz
C. metres, hertz and second
D. hertz, second and metres
29. A note of frequency 200Hz has a velocity of 400ms–1. Calculate the wavelength of the note.
A. 5.0m
B. 2.0m
C. 0.5m
D. 0.2m
30. The eclipse of the moo occurs when
A. moon comes exactly between the earth and the sun
B. earth comes exactly between the moon and the sun
C. sun comes exactly between the earth and moon
D. moon reflects all the rays from the sun onto the earth
31. Which of the following observation cannot be explained suing the rectilinear propagation of light?
A. Production of images by a pinhole camera
B. Production of real images of objects
C. Formation of an annular eclipse
D. Diffraction pattern of light
32. The distance between the successive crest of a wave travelling at 20ms–1 is 25cm. Calculate the frequency of the wave.
A. 0.8Hz
B. 5.0Hz
C. 50.0Hz
D. 80.0Hz
33. A ray from a fixed object is incident on a plane mirror at an angle of 20oc. if he mirror is rotated through 30o by how many degree would the reflected ray rotate
A. 60o
B. 50o
C. 40o
D. 30o
34. Which of the following distances is usually adjustable in the camera
A. lens and the film
B. diaphragm and the shutter
C. shutter and the film
D. diaphragm and the film
35. A travelling microscope is focused on a mark on a table. If a glass block of thickness 18.0cm is placed on the Mark, how many centimetres will the microscope be moved upward so as to focus the mark once again/
[Refractive index of glass =1.5]
A. 27c,m
B. 24cm
C. 9cm
D. 6cm
36. Which of the following media would sound travel fastest
A. Wood
B. Water
C. Iron
D. Mercury
37. Which of the following actions is necessary in order to tune a string to produce a note from an octave higher than its fundamental?
A. Doubling the length of the string
B. Reducing the tension by half
C. Reducing the mass per unit length
D. Increasing the tension four times
38. The acceleration due to gravity may be defined as the force
A. of attraction of the sun on the earth
B. with which the earth revolves around the sun
C. with which the earth attracts one-kilogram mass
D. of the moon on the earth
39.An electron of mass m and charge enters a uniform electric field between two metals 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 the field
A. $\frac{eV}{md}$
B. $\frac{d}{meV}$
C. $\frac{md}{eV}$
D. $\frac{e}{Vmd}$
40. Which of the following factors does not affect the capacitance of a parallel plate capacitor?
A. Area of the plates
B. nature of the surface of the plates
C. Distance of separation between the plates
D. Nature of the insulating material between the plates
41. The equivalent capacitance of a 3µF capacitor and 6µF capacitor connected in parallel is
A. 2.0µF
B. 3.0µF
C. 4.5µF
D.9.0µF
42. A cell of e.m.f 1.5V and internal resistance 1.0Ω is connected to two resistors of resistance 2.0 Ω and 3.0 Ω in series. Calculate the current through the resistors
A. 0.25A
B. 0.30A
C. 0.35A
D. 0.50A
43. An electric lamp rated 120W is used on a 240Vrms, Calculate the resistance of its fikament
A. 480 Ω
B. 360 Ω
C. 60 Ω
D. 2 Ω
44. Which of the following statement about bar magnet is correct?
A. Iron filling cling uniformly along the length of the bar magnet
B. The magnetic properties are more pronounced at the middle of a magnet
C. It is impossible to have the same poles at the ends of a magnet
D. The magnetic properties are more pronounced at point near the end of the bar
45. The force experienced by a current-carrying conductor moving in a magnetic field is employed in the working of the
I. moving coil ammeter
II. electric bell
III. electric motor
Which of the statement above are correct?
A. I and II only
B. II and III only
C.I and III only
D. I, II and III
46. The breaking up of atomic nucleus into to fragments of nearly equal sizes is known as
A. nuclear fusion
B. nuclear fission
C. thermonuclear reaction
D. natural radioactivity
47. A 500kVis applied across an X-rays tube. Calculate the maximum velocity of the electrons produced [Me = 91×10–31kg, e =1.6×10–19C]
A. 4.2×108ms–1
B. 1.8 ×108ms–1
C. 4.2×105 ms–1
D. 4.2×105ms–1
48. A radioactive substance of mass 768g has a half lif of 3 years. After how many years does this substance leave only 6g undecayed?
A. 21
B. 18
C. 15
D. 12
49. Fusion is not usually for generating electric power because
A. no energy is released when fusion takes place
B. very high temperature is required too initiate fusion reaction
C the raw material needed are not easily available
D. heavy nuclei are involved
50. An atom $_{91}^{234}P$ emits a gamma radiation. The resultant nuclei is
A.$_{90}^{234}Th$
B. $_{89}^{234}Ac$
C. $_{90}^{230}Th$
D. $_{91}^{234}Pa$