WASSCE PHYSICS MAY/JUNE 2001 (SSCE WAEC MAY/JUNE 2001 PHYSICS)
Now answer the following questions
1. Which of the following physical process cannot be explained by the molecular theory of matter?
A. Evaporation
B. Thermal conduction
C. Radiation of heat
D. Convection currents in fluids
2. A spring balance, which is suspended from the roof of a lift, carries a mass of 1kg at its free end accelerates upward at 2.5ms–2, determine the reading on the spring balance. [g =10ms–2]
A. 25.0N
B. 12.5N
C. 7.5N
D. 4.0N
3. An object of weight 10N immersed in a liquid displaces a quantity of the liquid. If the liquid displaces a quantity of the liquid. If the liquid displaced weighs 6N determine the upthrust on the objects
A. 20N
B. 10N
C. 6N
D. 4N
4. Which of the following statement about pressure is not correct? Pressure
A. increase with an increase in surface area
B. decrease with increase in surface area
C. Increase with decrease in surface area
D. increases with an increase in the applied force
5. The apparent weight of a body fully immersed in water is 32N and its weight is air is 96N. Calculate the volume of the body [Density of water =100kgm–3, g =10ms–2]
A. 8.9×10–3m3
B. 6.4×10–3m3
C. 3.2×10–3m3
D. 3.0×10–3m3
6. A block weighing 15N rests on a flat surface and horizontal force of 3N is exacted on it. Determine the frictional force on the block.
A. 0.3N
B. 0.5N
C. 3.0N
D. 5.0N
7. Which of the following equation represents the distance x, travelled by a body moving on a straight road with a constant speed? [The other symbol have their usual meaning]
A. $x=ut+\tfrac{1}{2}a{{t}^{2}}$
B. $x=ut$
C. $x=\frac{{{v}^{2}}-{{u}^{2}}}{2a}$
D. $x=\tfrac{1}{2}a{{t}^{2}}$
8. The amplitude of the motion of a body performing simple harmonic motion decreases with time because
A. frictional forces dissipate the energy of motion
B. the frequency of oscillation varies with time
C. the period of oscillation varies with time
D. energy is supplied by some external agencies
9. The amplitude of a particle executing simple harmonic motion is 5cm while its angular frequency is 10rad s–1. Calculate the magnitude of the maximum acceleration of the particle
A.0.25ms–2
B. 0.05ms–2
C. 2.00 ms–2
D. 5.00 ms–2
10. The time rate of change of momentum is
A. impulse
B. force
C. power
D. pressure
11. Which of the following statement about the elastic collision is correct ?
A. Momentum is lost due to the sound produced
B. Loss in momentum is equal to loss in kinetic energy
C. Both kinetic energy and momentum are conserved
D. Kinetic energy is lost while momentum is conserved
12. Electrical resistance is a property of an electrical conductor that causes electrical energy to be converted into mechanical energy
A. mechanical energy
B. heat energy
C. magnetic energy
D. chemical energy
13. A simple machine with an efficiency of 75% lift a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine
A. 10.0
B. 13.3
C. 17.5
D. 17.5
14. A screw jack with tommy bar length 12cm is used to raise a car through a vertical height of 25cm by turning the tommy bar through 50 revolutions. Calculate the approximate velocity ratio of the jack [π =3.14]
A. 21
B. 38
C. 48
D. 151
15.
A beam PQ pivoted at P carries a load of 80N as shown above. Calculate the effort E, required to keep it horizontal [neglect the weight of the beam]
A. 32.0N
B. 26.7N
C. 16.0N
D. 13.3N
16. A resistance thermometer has a resistance of 20Ω at 0oC and 85 Ω at 100oC. If its resistance is 52 Ω in a medium, calculate the corresponding temperature
A. 49.2oC
B. 60.6oC
C. 80.0oC
D. 84.7oC
17. A given mass of an ideal gas has a pressure of 500Nm–2 at –13oC.If its volume remains constant, calculate its pressure at 247oC
A. 25Nm–2
B. 50Nm–2
C. 500Nm–2
D. 1000 Nm–2
18. The volume of an ideal gas at a pressure of 77cmHg and temperature 60oC is 240cm3. If the temperature and pressure are increased to 98oC and 81cm Hg respectively. Calculate the new volume of the gas
A. 411.5cm3
B. 267.1cm3
C. 254.2 cm3
D. 112.7cm3
19. The amount of heat given out or absorbed when a substance changes its stateat constant temperature is known as
A. latent heat
B. heat capacity
C. specific latent heat
D. specific heat capacity
20. Which of the following physical quantities affects the saturated vapour pressure of a liquid
A. Temperature
B. Volume
C. Mass
D. Density
21. Humidity is used to describe the amount of
A. air in water vapour
B. cloud available in the atmosphere
C. air in equal volumes of cloud
D. water vapour in the atmosphere
22. Surface waves travelling in deep water at 15ms–1 are incident at a shallow water boundary. If the angles of incidence and refraction are 45o and 30o respectively, calculate the speed of the waves in the shallow water.
A. 8.1ms–1
B. 10.0ms–1
C. 10.6ms–1
D. 22.5ms–1
23. An incident ray is reflected normally by a plane mirror onto a screen where it forms a bright spot. The mirror and screen are parallel and 1m apart. If the mirror is rotated through 5o, calculate the displacement of the spot.
A. 8.7cm
B. 10.0cm
C. 15.4cm
D.17.6cm
24. Convex spherical mirrors are preferred to plane mirrors as driving mirrors because
A. the image produced is upright and clearly visible
B. It provides a wider field of view
C. the image produced is erect and diminished
D. the Image produced is not laterally inverted
25. An object is placed 20cm from a lens. If an image is formed on a screen 260cm away from the lens. Calculate the magnification of the image
A. 28
B. 26
C. 24
D. 13
26. A piece of cloth appears green in sunlight. When held in red light , it will appear
A. green
B. blue
C. red
D. black
27. Dispersion of white light by a glass prism occurs because
A. White light consist of a mixture of seven different colours
B. the refractive index of glass is different for each constituent colour of white light
C. the speed of each colour of light in the glass is proportional to the refractive index of glass for each colour
D. the speed of each colour of light in the glass is proportional to the angle of refraction in the prism
28. Which of the following statement about sound is correct?
A. When sound travel from air to a denser medium , it is refracted away from the normal at the point of incidence
B. Sound travels in air than in water
C. The wavelength of sound changes when it travels from air to water
D. The frequency of sound changes when it travels from air to water
Use the information below to answer question 29 to 31
The diagram above shows the wire of sonometer box set into resonance by vibrating tuning fork of frequency, f when the wire is stretched by a tension, T. The resonating length of the wire is l, while the wavelength of the sound produced is λ,
29. Which of the following statement is not correct? The wave produced on the wire is
A. stationary and longitudinal
B. stationary and mechanical
C. mechanical and longitudinal
D. progressive and transverse
30. Which of the following statement about the frequency of vibration of wire is not correct?
A. proportional to the mass per unit length of the wire
B. equal to the frequency of the tuning fork
C. inversely proportional to the length of the wire
D. proportional to the square root of the tension.
31. If the frequency of the tuning fork at resonance is 256Hz, Calculate the frequency of vibration of the wire when the tension in the wire is increased to 196N
A. 130.6Hz
B. 182.9Hz
C. 358.4Hz
D. 501.8Hz
32. The magnitude of the gravitational force between two particles 0.10m apart is 10N. If the distance between them is increased to 0.20m, calculate the magnitude of the new force
A. 40.0N
B. 20.0N
C. 5.0N
D. 2.5N
33. As the plates of a charged variable capacitor are moved closer together, the potential difference between them
A. Increases
B. Decreases
C. remains the same
D. Is doubled
Use the diagram shown below to answer Question 34 and 35.
34. What is the effective capacitance in the circuit?
A. 2µF
B. 6 µF
C. 18µF
D. 216µF
35. What is the total energy stored by the capacitors?
A. 2.0×10–4J
B. 1.0×10–4J
C. 9.0×10–2J
D. 1.0×10–2J
36.Three identical lamps each of power 100W, are connected in parallel across a potential difference of 250V. Calculate the current in the circuit
A. 7.5A
B. 2.5A
C. 1.2A
D. 0.8A
37. An electric bulb is rated 60W, 220V, Calculate the resistance of its filament when it is operating normally
A. 296.7Ω
B. 400.0Ω
C.512.2Ω
D. 806.7Ω
39. Which of the following statement about magnetic lines of force is not correct?
A. A magnetic line of force is an imaginary line which the north pole of a magnetic line which the north pole of a magnet would describe if it is free to move
B. Magnetic lines of force do not cross one another
C. The presence of magnetic lines of force in a region indicates the presence of a magnetic lines of force in a region indicates the presence of a magnetic field
D. Magnetic lines of force are closely- packed together at neutral points
40. The material used for constructing the core of an electromagnet is
A. Iron
B. Carbon
C. Copper
D. Steel
41.
In the circuit diagram above, calculate the energy stored in the inductor at resonance
A. 0.050J
B. 0.010J
C. 0.010J
D. 0.005J
42.
Calculate the reactance of the inductor in the circuit diagram show above [π =22/7]
A. 132Ω
B. 214Ω
C. 264Ω
D. 269Ω
43. In which of the following transitions is the largest quantum of energy liberated by an hydrogen atom when the electron changes energy level
A. n = 2 to n = 1
B. n = 1 to n = 2
C. n=2 to n = 3
D. n =3 to n = 2
44. A photon of wavelength λ0 is emitted when an electron in an atom makes a transition from of energy 2Ek to that of Ek . If the electron transits from $\tfrac{4}{3}$Ek to Ek level determine the wavelength of the photon that would be emitted
A. 3λ0
B. 2λ0
C. ¾λ0
D. $\tfrac{1}{3}$λ0
45. Production of X- rays tube begins with
A. photo electric emission
B. collision of electrons
C. thermonic emission
D. field emission electrons
46. The nuclear number and the proton number of a neutral atom of an element are 23 and 11 respectively. How many neutrons are present in the atom
A. 11
B. 12
C. 23
D. 34
47. A nitrogen nucleus bombarded with alpha particle produces an oxygen nucleus and a proton. The nuclear reaction for this reaction is $_{2}^{4}He+_{7}^{14}N\to _{8}^{17}O+_{1}^{1}H+Q$
Which of the following statement about the reaction is not correct?
A. The bombardment results into a nucleus with a greater proton number
B. it is an induced nuclear reaction
C. It is a natural radioactive decay
D. The sum of the initial nucleon number is equal to the sum of the final nucleon number
48. In a nuclear reactor, electricity can be generated through the following processes
I. The steam is used to drive turbines
II. The heat energy released is removed by passing water through the reactor
III. The turbines in turn generates electricity
IV. The water then passes through some form of heat exchange to produce steam
A. II, IV, I and II
B. I,II, III and IV
C. III, I, IV and II
D. IV, I, III and II
49. Electrons passing through crystals are diffracted because they
A. are repelled by the atoms in the crystal
B. are attracted by the atoms in the crystal
C. possess wave properties
D. are particles
50. The duality of matter implies that matter
A. exists as a particle of dual composition
B. has momentum and energy
C. has both wave and particle properties
D. is made up of dual material