WASSCE PHYSICS MAY/JUNE 2010 (SSCE WAEC MAY/JUNE 2010 PHYSICS))
c1. Which of the properties of a long steel bar would alter if the bar were melted, recast into a cube and allowed to cool to its original temperature
A. Density
B. Volume
C. Specific heat capacity
D. Electrical resistance
2. Which of the following instrument is the best for measuring the diameter for a thin constantan wire?
A. Callipers
B. Metre rule
C. Micrometer screw gauge
3. What is the density of a fuel of relative density 0.72?
[Density of water = 1000kg m–3]
A.72kg m–3
B. 720kg m–3
C.7200kg m–3
D. 72000 kg m–3
4.The type of motion which a cylinder drum rolling down an inclined plane undergoes are
A. Circular and translational
B. Rotational and translational
C. rotational and circular
D. rectilinear and circular
5. Which of the following statement about a moving particle is correct?
A. If the resultant force acting on the particle is zero, then it is dynamic equilibrium
B. If the resultant force acting on the particle is greater than zero, then it is moving with a uniform velocity
C. The rate of change of its momentum with time takes palce in a direction opposite to that of its motion
D. The particle falling freely covers equal distances in equal time intervals
6. Which of the following statement about static friction is correct? It
A. is independent of the nature of surface in contact
B. depends on the area of surface in contact
C. depends on the relative motive between the surfaces in contact
D. depends on the weight of the moving body
7. Two cars X and Y travelling in opposite directions along the same highway at uniform velocities 110km h–1 and 90km h–1 respectively pass each at a certain point. The velocity of the X relative to Y at the time they pass each other is
A. 200 km h–1
B. 100 km h–1
C. 40 km h–1
D. 204 km h–1
8. The average speed of an object is determined by dividing the sum of its initial and final speed by two, only when the acceleration is
A. changing
B. uniform
C. Increasing
D. Decreasing
9. A body is project horizontal from the top of a cliff 45m above the ground. If the body lands at a distance 30m from the foot of the cliff. Calculate the speed of projection. [g = 10ms–2]
A. 10ms–1
B.15ms–1
C. 20ms–1
D. 30ms–1
10. Which of the following statement best describes a rigid body?
A. is not easily deformed
B. when deformed regains its shape
C. is brittle
D. when deformed remains deformed
11. A simple harmonic oscillator has a period of 0.02s and amplitude of 0.25m. Calculate the speed in ms–1 at the centre of the oscillation.
A. 1.25π
B. 25.00π
C.90.00π
D. 400.00π
12. A vertical string, suspended from a fixed point and having a small attached to the free end is set into oscillations. Which of the following statements about the system are correct?
I. The potential energy of the mass is a minimum at the middle of the swing
II. Its kinetic energy is a maximum at die middle of the swing
III. The sum of the potential and kinetic energies is constant throughout the swing
A. I, II and III
B. I and II only
C. II and III only
D. I and III only
13. A moving body of mass 25.0kg undergoes a uniform retardation of 20ms–2. Calculate the magnitude of the retarding force
A. 1.25N
B. 8.00N
C. 45.00N
D. 500.00N
14. Which of the following sources of energy is/are exhaustible?
I. Solar
II. Fossil fuels
III. Tidal power
A. II only
B. III only
C. I and II only
D. II and III only.
15. A machine is said to be a third class when the
A. load is between is fulcrum and effort
B. fulcrum is between the effort and load
C. effort is between the fulcrum and load
D. fulcrum is directly below the load
.
16. A thermometer records 680mmHg at steam point and 440mmHg at ice point. The temperature it records at 380mmHg is
A –25oC
B.–20oC
C. 20oC
D. 25oC
17. The advantage of the thermoelectric thermometer include the following characteristics except that it
A. can measure rapidly changing temperatures
B. can measure high and low temperatures.
C. can measure temperature almost at a point
D. is fairly sensitive
18. In a thermo flask, heat loss by radiation is minimized by the
A. silvered surfaces
B. vacuum within the double walls
C. plastic stopper
D. cork support
19. The pressure P, volume V and absolute temperature T of a given mass of an ideal gas, change simultaneously, which of the following equation is correct about the gas
A. \[PV=\frac{Constant}{T}\]
B.$\frac{P}{T}=constant$
C. $\frac{P}{V}=\frac{constant}{T}$
D. $\frac{1}{T}=\frac{constant}{PV}$
20. Specific heat capacity 26.4Jkg–1K–1 of a body means that when 26.4J of heat energy is supplied to a body of
A. mass 1000kg, the temperature rises by 1k
B. mass 1kg, the temperature rises by 1000k
C. mass 1 kg, the temperature rises by 1k
D. mass 1000kg , the temperature rises by 1000k
21. An electric drill rated 400W is used to drill a hole in copper of mass 400g in 20s.Calculate the rise in temperature ,if all the heat produced is absorbed by the copper.
[ Specific heat capacity = 400 Jkg–1K–1]
A. 100oC
B. 75oC
C. 50oC
D. 45oC
22.. A solid of mass 0.5kg initially at 50oC meltsat 60oC. Calculate the quantity of heat required to melt it completely.
[ Specific heatt of the solid 2.0 Jkg–1K–1]
[Specific heat capacity of copper -400 Jkg–1K–1]
A. 1500J
B. 10000J
C. 10500J
D. 15000J
23. Dew point is not affected by
A. temperature
B. Wind
C. the amount of water vapour in the atmosphere
D. atmospheric pressure
24. A certain wave has a speed of 20ms–1. If the frequency of the wave is 0.25Hz. Calculate the distance between successive crest of the wave
A. 5.0m
B.40.0m
C. 50.0m
D. 80.0m
50. The ability of a wave spread around corners is called
A. polarisation
B. dispersion
C. diffraction
D. reflection
26. The following devices use plane mirror in their operations except
A. Periscope
B. Sextant
C. Kaleidoscope
D. Binoculars
27. When an object is placed at the principal foucs of a cancave mirror. The location of the image formed is
A. between principal focus and pole
B. between principal focus and centre of curvature
C. at infinity
D. at centre of curvature
28.
From the diagram above, the correct equation for the refractive index n of the medium is
A. n = tan i
B. $n=\frac{\sin i}{\sin {{90}^{\circ }}}$
C. $n=\frac{\sin i}{\cos ({{90}^{\circ }}-\theta )}$
D. n = sin 90o
29. A ray of light travels from air to water. The refractive index of water is given by the expression
A. $\frac{velocity\text{ }in\text{ }water}{velocity\text{ }in\text{ }air}$
B. $\frac{sine of angle of refraction}{sine of angle of incidence}$
C. $\frac{apparent\text{ }depth}{real\text{ }depth}$
D.$\frac{wavelength in air}{wavelength in water}$
30. A lens than is thinner at the middle and thicker at the edges os
A. diverging
B. converging
C. plano-convex
D. converging menicus
31. Which of the following electromagnetic waves has the longest wavelength?
A. Radio waves
B. Gamma rays
C. Infrared waves
D. Ultraviolet rays
32. The amplitude of a sound waves determines its
A. frequency
B. quality
C. loudness
D. pitch
33. As the air column of length L in an air pipe decreases, the frequency of the stationary waves emitted
A. decreases
B. increases
C. varies as L2
D. varies as
34. A positively charged glass rod is placed near the cap of a positively charged electroscope. The divergence of the leaf is observed to
A. decrease
B. increase
C. remain the same
Increase and collapse immediately
35. Capacitors are used in the following devices except
A. Water pumping machines
B. Ceiling fans
C. Electric irons
D. television sets
Use the diagram below to answer 36 and 37
36.Calculate the current I
A. 0.60A
B. 0.97A
C. 1.03A
D. 5.00A
37. Determine the potential difference, V across the parallel resistors
A. 2.0V
B. 2.3V
C. 3.0V
D. 9.7V
38. A galvanometer of internal resistance 50Ω and full scale deflection of 20mA is converted into a voltmeter by connecting a resistor of resistance 1950Ω in series to it. Calculate the maximum voltage that can be read by the Voltmeter
A . 20V
B. 30V
C. 38V
D. 40V
39. In the wiring of houses, the fuses is connected to wire coloured
A. blue
B. brown
C. yellow
D. yellow and green
40. Which of the following factors does not affect the electric resistance of a wire?
A. Length
B. Mass
C. Temperature
D. Cross- sectional area
41. Which of the following will increase the sensitivity of a moving coil meter?
A. Strong spring
B. Low number of turns
C. Small area of coil
D. Soft iron core
42. In order to prevent bar magnet from losing their strength, they are stored with keeprs such that the two bars are placed with
A. like poles facing each other and the keepers placed at the ends
B. like poles facing each other and the keepers placed between them
C. unlike poles facing each other and the keepers placed at their ends
D. unlike poles facing each other and the keepers placed between them.
43. The resonant frequency of an a.c circuit is 1000kHz. If each of the capacitance and inductance in the circuit is reduced by 50% and no changes made, the resonant frequency will become
A. 250kHz
B. 750 kHz
C. 1000 kHz
D. 2000 kHz
44. The energy, stored in an inductor of inductance L when current I passes through it is given by the equation
A. $E=\tfrac{1}{2}L{{I}^{2}}$
B. $E=L{{I}^{2}}$
C. $E=\tfrac{1}{2}LI$
D. $E=\tfrac{1}{2}{{L}^{2}}I$
45. Eddy current can be reduced by
A. Using coil of high resistance
B. winding the coil on a soft iron core
C. creating holes in the plates
D. using coil of low resistance
46. An electron moves with speed of 2.0×106 ms–1 in a straight line. Calculate the wavelength of the electron wave,
[mass of an electron = 9.1 ×10–31kg}
[planck constant =6.6 ×10–34Js]
A. 3.63×10–10m
B. 6.51×10–9m
C. 4.24×10–8m
D. 7.25×10–8m
47. Oxidation of the filament in a light bulb is prevented by introduction of
A. hydrogen
B. oxygen
C. argon
D. mercury
48. Ina cathode ray tube, the function of X – plate is to
A. deflect the electron beam horizontally
B. deflect the electron beam vertically
C. Reflect the electron beam
D. generate sinusoidal waves
49. A nucide represented as $_{32}^{70}X$ has a neutron – proton ratio of
A.0.5
B. 0.8
C. 1.2
D. 1.5
50.Neutrons are used to induce artificial radioactivity because they
A. are energetic
B. have no charge
C. have no mass
D. are ionizing