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WAEC - Physics (2013)

  • 1
    The rising of a liquid in an open and ended glass tube of narrow bore is
    პასუხი
    (C)
    capillarity
  • 2
    Which of the following units is equivalent to the watt?
    პასუხი
    (B)
    kgm2s-3
  • 3
    Which of the following statements about pressure in a liquid is correct?
    პასუხი
    (A)
    the pressure in a liquid increases with depth
  • 4
    Solid friction, like viscosity is
    პასუხი
    (D)
    in opposition to motion
  • 5
    The slope of a linear distance-times graph represents
    პასუხი
    (C)
    speed
  • 6
    A body of mass 2kg is released from rest on a plane inclined at an angle of 60° to the horizontal. Calculate the acceleration of the body down the plane.[g = 10ms\(^{-2}\)]
    პასუხი
    (D)
    8.7ms-2
  • 7
    The total area under a force-velocity graph represents
    პასუხი
    (C)
    power
  • 8
    A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms\(^{-2}\)]. Calculate the speed of projection
    პასუხი
    (C)
    12.0ms-1
  • 9
    A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms-2]. Determine the potential energy of the body at the maximum height of its motion
    პასუხი
    (A)
    0.36J
  • 10
    The maximum displacement on either side of the equilibrium position of an object in simple harmonic motion represents
    პასუხი
    (B)
    amplitude
  • 11
    From Newton's first law of motion,
    პასუხი
    (C)
    the net force acting in uniform linear motion is zero
  • 12
    A body of mass 11kg is suspended from a ceiling fan by an aluminum wire of length 2m and diameter 2mm. Calculate the elastic energy stored in the wire [Young's modulus of aluminum is 7.0 x \(10^10Nm^{-2}\), g = 10m\(s^{-2}\), \(\pi\) = 3.142]`
    პასუხი
    (B)
    5.5 x 10-2J
  • 13
    The velocity ratio of an inclined plane
    პასუხი
    (B)
    increases with decrease in the angle of inclination
  • 14
    Which of the following types of thermometer is used for the calibration of other thermometers?
    პასუხი
    (B)
    constant volume gas thermometer
  • 15
    The magnitude of the expansion or contraction of a substance depends on the i. temperature change ii. nature of the substance iii. size of the substance. Which of the statements above are correct?
    პასუხი
    (A)
    i and ii only
  • 16
    Highly polished silvery surfaces are
    პასუხი
    (B)
    poor absorbers and good emitters of radiation
  • 17
    The volume of a given mass of gas at 27oC and 800 mmHg is 76cm2. Calculate its volume at s.t.p
    პასუხი
    (B)
    72.8 cm3
  • 18
    Ice of mass 10g at 5°C was completely converted to water at 0°C, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 336 Jg\(^{-1}\)]
    პასუხი
    (C)
    3465J
  • 19
    An electric heater has a resistance of 50\(\Omega\). When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings
    პასუხი
    (D)
    96000J
  • 20
    When salt is dissolved in water, the freezing point of the water
    პასუხი
    (B)
    decreases
  • 21
    The equation of a certain progressive transverse wave is y = 2 sin 2 \(\pi ( \frac{t}{0.01} - \frac{x}{30})\), where x and y are in cm and t in seconds. Calculate the period of the wave.
    პასუხი
    (B)
    0.010s
  • 22
    At which position should an object be placed in front of a concave mirror in order to obtain an image which is of the same size as the object?
    პასუხი
    (A)
    at the centre of curvature
  • 23
    Images formed by a convex mirror are always
    პასუხი
    (B)
    behind the mirror
  • 24
    The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface
    პასუხი
    (D)
    42o
  • 25
    A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance
    პასუხი
    (B)
    12cm
  • 26
    Which of the following statements about the Galilean telescope is not correct?
    პასუხი
    (A)
    the final image is inverted
  • 27
    Which of the following radiations has it's frequency lower than that of infrared radiation?
    პასუხი
    (D)
    radio waves
  • 28
    A string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled.
    პასუხი
    (C)
    28Hz
  • 29
    Which of the following statements about waves in pipes is correct?
    პასუხი
    (C)
    only odd harmonics are possible in closed pipes
  • 30
    When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?
    პასუხი
    (A)
    negative charges flows to the ground through the person's body
  • 31
    A charge of 2.0 x 10\(^{-5}\) C experiences a force of 80N in a uniform electric field. Calculate the magnitude of the electric field intensity
    პასუხი
    (B)
    4.0 x 106 NC-1
  • 32
    A potential difference of 12V is applied across the ends of a 6\(\Omega\) resistor for 10 minutes. Determine the quantity of heat generated
    პასუხი
    (C)
    14400J
  • 33
    Which of the following instruments is used to determine the accurate value of the electromotive force of a cell?
    პასუხი
    (D)
    potentiometer
  • 34
    The capacitance of parallel plates capacitors varies
    პასუხი
    (C)
    inversely as the distance between the plates
  • 35
    Which of the following devices does not makes use of eddy current for its action? A/An
    პასუხი
    (D)
    induction coil.
  • 36
    A coil of inductance 0.12 H and resistance 4\(\Omega\), is connected across a 240V, 50Hz supply. Calculate the current through it. [\(\pi\) = 3.142]
    პასუხი
    (A)
    6.3A
  • 37
    The work function of a metal is 2.56 x 10-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10-19J, h = 6.6 x 10-34Js]
    პასუხი
    (C)
    1.12 x 1015Hz
  • 38
    The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called
    პასუხი
    (C)
    work function
  • 39
    Which of the following particles are termed nucleons in a neutral atom?
    პასუხი
    (A)
    protons and neutrons
  • 40
    Which of the following statements about the use of radioisotopes is not correct? They are used to
    პასუხი
    (A)
    induce mutations in plants and animals to obtain new and improved varieties
  • 41
    Which of the following phenomena supports the theory that waves have a particle nature?
    პასუხი
    (B)
    photoelectric effect
  • 42

    A block of wood of mass 5kg is pulled on a platform by a force of 40N as illustrated in the diagram above. If the frictional force, F experienced by the block is 12N, calculate the magnitude of the acceleration of the acceleration of the block

    პასუხი
    (B)
    5.6ms-2
  • 43
    Four co-planar forces of magnitudes 10N, 17N, 6N and 20N act at point O as shown in the above diagram. Determine the magnitude of the resultant force
    პასუხი
    (D)
    5.0N
  • 44

    The outlet of a bicycle pump is used to inflate a football as illustrated in the diagram above. Why does the pressure of the air inside the pump increases as the pump handle is slowly pushed downward at constant temperature?

    პასუხი
    (C)
    frequency of collision of the air molecules with the walls of the pump is increased
  • 45
    The diagram above illustrates a waveform. Which of the point on the waveform are in phase?
    პასუხი
    (D)
    Q and S