2020 Physics WAEC SSCE (School Candidates) May/June

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Physics 1 - Objective Test Questions

1. In a collision between two objects, kinetic energy is conserved only if
   1. one of the objects was initially at rest
   2. potential energy is converted to work
   3. the collision is inelastic
   4. the collision is elastic
2. The quantity of motion of a body is its
   1. acceleration
   2. displacement
   3. momentum
   4. velocity
3. The volume of a fixed mass of a gas varies inversely as the pressure on it, provided the temperature is constant, This statement is
   1. Pressure law
   2. Charles' law
   3. Boyle’s law
   4. General gas law
4. An image formed on a screen is always
   1. inverted
   2. magnified
   3. upright
   4. virtual
5. How would the capacitance of a parallel plate capacitor be affected if the distance of separation of its plates is decreased? It will
   1. increase in value
   2. decrease slightly
   3. remain unchanged
   4. drop to zero
6. Which of the following machines does not apply the lever principle?
   1. Claw hammer
   2. Wheelbarrow
   3. Single pulley
   4. Sugar tong
7. The average distance moved by a molecule between collisions is called
   1. molecular distance
   2. intermolecular distance
   3. mean distance
   4. mean free path
8. Which of the following waves requires a material medium for its propagation?
   1. Radio waves
   2. Light waves
   3. Sound waves
   4. X-rays
9. The depolarizing agent in a Leclanche cell is
   1. carbon rod
   2. ammonium chloride
   3. manganese (IV) oxide
   4. zinc plate
10. The material used to slow down the neutrons in a nuclear reactor is
    1. boron.
    2. copper
    3. graphite
    4. uranium
11. Which of the following statements explains why hot soapy water is more effective in cleaning oil-stained dishes?
    1. The oil on the dishes repels the soap
    2. Soap and heat decrease the surface tension of water
    3. Hot water increases the surface tension of oil
    4. Soap increases the surface tension of oil and water.
12. (Image) The diagram above illustrate a beam of parallel rays from a distant object O, incident on one side of total reflecting prism. Which diagram does not represent the correct path of the beam when it emerges from the prism?
    1. W
    2. X
    3. C
    4. Z
13. An electrical device has 50 turns in its primary coil and 20 turns in the secondary coil. The device can be a/an
    1. step-up transformer
    2. step-down transformer
    3. d.c. generator
    4. a.c. generator.
14. The earpiece of a telephone handset converts energy from
    1. electrical to sound
    2. sound to electrical
    3. radio wave to sound
    4. sound to radio wave
15. Two identical cups containing the same volume of water at 45°C and 5°C, are left in a room at 25°C. Which of the following graphs correctly illustrates the variation of temperature with time? (all options are images)
    1. Option a
    2. Option b
    3. Option c
    4. Option d
16. A ray of light traveling from glass into ethyl alcohol is incident at the boundary at an angle of incidence 30. Calculate the angle of refraction. (Refractive index of glass = 1.5; refractive index of ethyl alcohol = 1.36).
    1. 27.0°
    2. 33.5°
    3. 51.7°
    4. 72.8°
17. A 60 kg man stands on a weighing balance in an elevator. If the elevator accelerates upwards at 5ms^-2, determine the reading of the scale [g =10ms^-2]
    1. 300N
    2. 600N
    3. 800N
    4. 900N
18. The length of an iron bar is 100cm at 20°C. At what temperature will its length increase by 0.01%? [Linear expansivity of iron = 1.2 x 10^-3°C^-1].
    1. 48.0°C
    2. 38.0°C
    3. 28.3°C
    4. 23.0°C
19. A moving-coil galvanometer which gives a full-scale deflection with 0.005A is converted to a voltmeter reading up to 5V using an external resistance of 975Ω. What is the resistance of the metre?
    1. 0.25Ω
    2. 2.50Ω
    3. 25.00Ω
    4. 250.00Ω
20. A beam consisting of α- particles. β-particles and γ-rays pass through a magnetic field at right angles to the direction of the field. Which of the following observations would be made about the α- particles. β-particles and γ-rays respectively?
    1. Deflected, deflected, deflected.
    2. Deflected deflected, not deflected
    3. Deflected, not deflected, deflected
    4. Not deflected, deflected, deflected.
21. A parallel plate capacitor is charged and the charging battery subsequently disconnected. If the plates of the capacitor are moved farther apart by means of insulating handles, the
    1. capacitance would increase
    2. capacitance would decrease
    3. charge on the capacitor would increase
    4. charge on the capacitor would decrease
22. The velocity of sound in air at 15°C is 340ms^-1. Calculate the velocity at 47°C.
    1. 790ms^-1
    2. 602ms^-1
    3. 358ms^-1
    4. 322ms^-1
23. Which of the current-voltage characteristics shown below is that exhibited by an ohmic conductor?(all options are images)
    1. Option a
    2. Option b
    3. Option c
    4. Option d
24. 500 N box rests on a horizontal floor, A constant horizontal force is exerted on the box so that it moves through 8m. If the coefficient of kinetic friction between the floor and the box is 0.22. Calculate the work done oh the box.
    1. 880J
    2. 440J
    3. 400J
    4. 110J
25. (Insert image and paragraph above) The normal force of the ball is
    1. mgsin θ
    2. mgtan θ
    3. mgcos θ
    4. mgcot θ
26. The net force on the ball along the plank is
    1. mgsin θ + F
    2. F - mgcos θ
    3. mgsin θ - F
    4. F + mgcos θ
27. What factors determine the frequency of a note emitted by a vibrating string?
    1. Amplitude of vibration, force constant of string and length of string
    2. Amplitude of vibration, force constant of string and tension in string
    3. Mass per unit length of string, tension in string and length of string
    4. Force constant of string, tension in string and length of string.
28. The magnitude of the force experienced by a charge of 1.6 x 10^-8C in a uniform electric field of intensity 5 x 10⁵NC^-1 is
    1. 3.2 x 10^-14N
    2. 8.0 x 10^-3N
    3. 8.0 x 10³N
    4. 3.1 x 10¹³N
29. Which of the following statements about viscosity is not true?
    1. depends on areas of the surfaces in contact
    2. occurs in fluids
    3. is independent of the relative velocity of the layers’
    4. depends on the tangential force between the layers.
30. A motorcycle starting from rest, is uniformly accelerated such that its velocity in 10s is 72km/hr^-1. What is its acceleration?
    1. 108ms^-2
    2. 86ms^-2
    3. 4ms^-2
    4. 2ms^-2
31. The temperature of an object is raised by 120°C. The resulting increase in its absolute temperature is
    1. 50K
    2. 120K
    3. 200K
    4. 393K
32. Which of the following statements about the motion of a simple pendulum is true?
    1. it is a simple harmonic motion when the angle of displacement is large
    2. it passes the equilibrium position with minimum speed
    3. it possesses maximum kinetic energy at the extreme positions
    4. it swings faster at the poles than at the equator
33. An electron of mass m and charge e moves in a circular path in a magnetic field of flux density B. How long does it take to complete one orbit?
    1. ${\frac {2me}{B\pi }}$
    2. ${\frac {2B}{me\pi }}$
    3. ${\frac {2{\pi }m}{{B}e}}$
    4. ${\frac {{B}e}{2m\pi }}$
34. Which of the following statements about photoelectrons is correct?
    1. faint green light produces photoelectrons with less kinetic energy than a bright red light
    2. A red light releases a smaller number of electrons than a green light
    3. A faint green light produces photoelectrons with greater kinetic energy than a bright red light
    4. A red light produces more photoelectrons than a green light.
35. The sketched graph above illustrates the heating curve of a 0.02 kg of water. Determine the approximate value of the specific latent heat of vapourization of water.
    1. 2.25 x 10^-6 Jkg^-1
    2. 4.17 x 10³Jkg^-1
    3. 2.00 x 10³Jkg^-1
    4. 1.00 x 10^-3 Jkg^-6
36. In the hydraulic press the force F applied is related to the diameter of the cylinder by,
    1. F ∝ d²
    2. F ∝ d
    3. F ∝ d^-1
    4. F ∝ d^-2
37. In an electric circuit, an inductor of inductance 0.5 H and resistance 50Ω is connected to an alternating current source of frequency 60 Hz. Calculate the impedance of the circuit.
    1. 50.0 Ω
    2. 150.5 Ω
    3. 195.0 Ω
    4. 1950.1 Ω
38. Which of the following statements correctly explains why a total solar eclipse would be seen by people on only a small portion of the earth surface? The
    1. moon is larger in diameter than the earth
    2. earth is larger in diameter than the sun
    3. earth revolves around the sun
    4. earth is larger in diameter than the moon.
39. Water waves have a wavelength of 3.6cm and speed of 18cms^-1 in deep water. If the waves enter a shallow water with wavelength of 2.0 cm, calculate the speed of the waves in the shallow water.
    1. 0.4 cms^-1
    2. 2.5 cms^-1
    3. 10.0 cms^-1
    4. 10.8 cms^-1
40. An a.c. generator can be converted to a d.c. motor by replacing the
    1. slip rings with split ring and connecting a battery
    2. split ring with slip rings and connecting a battery
    3. a.c. with d.c. source and connecting slip ring
    4. a.c. with d.c. source and connecting split rings.
41. A ray of light travels obliquely from a less dense medium to a denser medium. Which of the following statements is true about the light?
    1. The wavelength of the light increases in the second medium
    2. The speed of the light increased in the second medium
    3. The light refracts towards the normal
    4. There is a change in the frequency of the light
42. An electron of mass 9.1 x 10^-31 kg is traveling at a speed of 2.0 x 10⁶ ms^-1. Calculate the associated wavelength of the electron. [h=6.6 × 10^-34 Js]
    1. 3.63 x 10^-10m
    2. 3.63 x 10^-8m
    3. 3.63 x 10^-7m
    4. 6.89 x 10^-4m
43. Which of the following statements about the process of melting of a solid are true? The temperature of the solid will I. remain steady until melting starts II. keep rising until melting starts III. remain steady as melting proceeds IV. keep rising as melting proceeds.
    1. II and III only
    2. II and IV only
    3. I, II and III only
    4. II, III and IV only
44. A diver steps off a diving platform that is 10 m above the water. If there is no air resistance during the fall. there will be a decrease in the diver’s
    1. gravitational potential energy
    2. total mechanical energy
    3. kinetic energy
    4. momentum.
45. Which of the following actions would increase the electric force between positively charged particles?
    1. Decreasing the mass of the particles
    2. Decreasing the distance between the particles
    3. Increasing the distance between the particles
    4. Increasing the mass of the particles.
46. A luminous object is one that
    1. gives off dim blue-green light only in the dark
    2. gives out light of its own
    3. shines by reflected light only
    4. glows only in the presence of light
47. Which of the following units is not fundamental?
    1. Metre
    2. Kilogram
    3. Joule
    4. Candela
48. The vacuum between the double walls of a thermos flask reduces heat loss through
    1. conduction and radiation
    2. convention and conduction
    3. radiation only
    4. conduction only
49. In photoelectric effect, the number of electrons emitted per second from a metallic surface is proportional to the
    1. intensity of the incident radiation
    2. frequency of the incident radiation
    3. energy of the incident radiation
    4. work function of the metal
50. When two cells of negligible internal resistances and equal emf denoted by E₁ and E2 are connected in parallel, the combined e.m.f. E is given by
    1. E = E₁ + E₂
    2. ${\frac {1}{E}}={\frac {1}{E_{1}}}+{\frac {1}{E_{2}}}$
    3. E = E₁ = E₂
    4. $E={\tfrac {E_{1}}{E_{2}}}$

Biology 2 - Theory Questions

Part 1

1. An elastic material of length 3 m is to be stretched to produce an extension three times its original length. Calculate the force required to produce the extension if the force constant of the material is 982.3 Nm^-1.
2. In a solar panel for heat supply, state the function of each of the following parts:
   1. metal flat plate;
   2. thermal insulator;
   3. tubes
3. 1. In the design of an optical fibre, what type of material is most suitable for the design of the core?
   2. State one condition necessary to confine signals to the core of an optical fibre.
4. The velocity v of a wave in a stretched string depends on the tension, T, in the spring and the mass per until length μ of the spring. Obtain an expression for v in terms of T and μ, using the method of dimensions. dimensions.
5. A satellite launched with velocity V_E, just escapes the earth’s gravitational attraction. Given that the radius of the earth is R, show that V_E= $\surd$20R. [g=10ms^-2]
6. A bullet is fired from a gun at 30° to the horizontal. The bullet remains in flight for 25s before touching the ground. Calculate the velocity of projection. [g=10ms^-2].
7. State three properties of lasers that make them preferable to ordinary light beam.

Part 2

8. 1. 1. Define a torque.
      2. State three factors that determine a torque.
   2. 1. Define free full
      2. A body is thrown vertically upwards from the top of a tower 40.0m high with a velocity of 10.0ms^-1. Calculate the time taken for the body to reach the ground. [g=10.0ms^-2]
   3. A cube of wood of side 8.0 cm, floats at the interface between oil and water with 2.0 cm of its lower surface below the interface as shown in the diagram below. Given that the relative densities of oil and water are 0.72 and 1.06 respectively, calculate the mass of the wood. (insert image below)
9. 1. 1. Explain resonance frequency as applied in RLC series circuit.
      2. Sketch a diagram to illustrate the variation of frequency, f, with the resistance, R, the capacitive reactance, X_c, and the inductive reactance, X_i, in RLC series circuit.
      3. Using the diagram drawn in 9(a)(ii), state whether the current in the circuit leads, lags or is In phase with the supply voltage when: (α) f = f_o; (β) f < f_o; (γ) f > f_o. Where f_o is the resonance frequency.
   2. 1. Define mutual inductance.
      2. The coil of an electric generator has 500 turns and 8.0 cm diameter. If it rotates in a magnetic design field of density 0.25 T, calculate angular speed when its peak voltage is 480V. [π = 3.142]
   3. 1. Explain eddy currents
      2. State two practical uses of eddy currents.
10. 1. 1. Define critical angle as used in optics.
       2. State two conditions necessary for total internal reflection to occur.
       3. List three practical applications of total internal reflection.
    2. State two effects of refraction.
    3. 1. Define progressive waves
       2. A plane progressive wave is represented by the equation$v=0.5sin(1000{\pi }t-{\tfrac {100\pi }{17}})$ where y is in millimetres, t in second, and x in metres. Calculate the: (a) frequency of the wave; (B) wavelength of the wave; (y) speed of the wave.
11. 1. In an experiment to measure the specific latent heat of vapourization of water, a student places a heater in a beaker containing water. The beaker stands on an electronic balance so that the mass of the beaker and water could be measured. The heater is switched on and readings taken every 100s when the water starts boiling. The table below shows the readings.

Time/s	0	100	200	300	400
Reading on balance/g	203.22	201.62	199.79	198.26	196.50
Mass of water evaporated/g	0
energy supplied by heater/J	0

12. 1. 1. Fill in the mass of water evaporated.
       2. Given that the heater supplies energy at the rate of 38 J/s, fill in the values of the energy supplied by the heater in 100s, 200s, 300s, 400s.
       3. Plot a graph of energy supplied on the vertical axis and.mass of water evaporate on the horizontal axis, starting both axes from the origin (0,0).
       4. Determine the slope of the graph.
       5. What does the value of the slope mean?
    2. 1. Explain what is meant by saturated vapour pressure.
       2. State the factor that affects saturated vapour pressure.
13. 1. 1. Define isotopes.
       2. Mention two uses of radioactive tracers in each of the following areas: (a) medicine;(B) industry; (y) agriculture.
    2. When light of frequency 5.4 x 10¹⁴ Hz is incident on a metal surface, the maximum energy of the emitted electrons is 1.2 x10^-19J. Calculate the minimum frequency of radiation for which electrons can be emitted. [h = 6.6 x 10^-34 Js].
    3. State three features common to electro-magnetic waves.
    4. 1. Mention four components of the nuclear reactor.
       2. State the function of each of the components stated in 12(d)(i).

Physics 3 - Practical Questions

Alternative A

1. Question 1
   1. Sub-question a
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   2. Sub-question b
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   3. Sub-question c
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   4. Sub-question d
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   5. Sub-question e
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   6. Sub-question f
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
2. Question 2
   1. Sub-question a
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   2. Sub-question b
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   3. Sub-question c
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   4. Sub-question d
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   5. Sub-question e
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   6. Sub-question f
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
3. Question 3
   1. Sub-question a
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   2. Sub-question b
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   3. Sub-question c
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   4. Sub-question d
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   5. Sub-question e
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v
   6. Sub-question f
      1. Sub-question i
      2. Sub-question ii
      3. Sub-question iii
      4. Sub-question iv
      5. Sub-question v