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WAEC Physics 2013

1. The rising of a liquid in an open and ended glass tube of narrow bore is
• A. osmosis
• C. capillarity
• D. surface tension

2. Which of the following units is equivalent to the watt?
• A. kgms-2
• B. kgm2s-3
• C. kgm2s-2
• D. kgm2s-1

3. Which of the following statements about pressure in a liquid is correct?
• A. the pressure in a liquid increases with depth
• B. the higher the density of a liquid, the lower the pressure it exerts
• C. pressure in liquid act only in a direction perpendicular to the sides of the containing vessel
• D. pressure is independent of the acceleration due to gravity

4. 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 block
• A. 2.4ms-2
• B. 5.6ms-2
• C. 8.0ms-2
• D. 10.4ms-2

5. Solid friction, like viscosity is
• A. independent of the surface area in contact
• B. independent of the relative motion between layers
• C. dependent on normal reaction
• D. in opposition to motion

6. The slope of a linear distance-times graph represents
• A. acceleration
• B. displacement
• C. speed
• D. velocity

7. A body of mass 2kg is released from rest on a plane inclined at an angle of 60o to the horizontal. Calculate the acceleration of the body down the plane.[g = 10ms-2]
• A. 3.1ms-2
• B. 5.2ms-2
• C. 6.0ms-2
• D. 8.7ms-2

8. The total area under a force-velocity graph represents
• A. energy
• B. momentum
• C. power
• D. pressure

9. 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
• A. 1.2ms-1
• B. 6.0ms-1
• C. 12.0ms-1
• D. 0.6ms-1

10. 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
• A. 0.36J
• B. 0.72J
• C. 360.00J
• D. 720.00J

11. Four co-planar forces of magnitude 10N, 17N, 6N and 20N act at point O as shown in the diagram above. Determine the magnitude of the resultant force,
• A. 50.0N
• B. 21.0N
• C. 7.0N
• D. 5.0N

12. The maximum displacement on either side of the equilibrium position of an object in simple harmonic motion represents
• A. period
• B. amplitude
• C. wavelength
• D. frequency

13. From Newton’s first law of motion,
• A. a body can only undergo translational motion
• B. once a body remains at rest no force acts on it
• C. the net force acting in uniform linear motion is zero
• D. a body’s inertia is its weight

14. 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 1010Nm-2, g = 10ms-2, π= 3.142]`
• A. 1.1 x 10-1J
• B. 5.5 x 10-2J
• C. 1.1 x 10-4J
• D. 5.5 x 10-8J

15. The velocity ratio of an inclined plane
• A. increases with increase in the angle of inclination
• B. increases with decrease in the angle of inclination
• C. decreases with decrease in the angle of inclination
• D. is independent of the angle of inclination

16. Which of the following types of thermometer is used for the calibration of other thermometers?
• A. liquid-in-glass thermometer
• B. constant volume gas thermometer
• C. optical pyrometer
• D. thermocouple

17. 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?
• A. i and ii only
• B. ii and iii only
• C. i and iii only
• D. i, ii and iii

18. Highly polished silvery surfaces are
• A. poor absorbers and poor emitters of radiation
• B. poor absorbers and good emitters of radiation
• C. good absorbers and poor emitters of radiation
• D. good absorbers and good emitters of radiation

19. The volume of a given mass of gas at 27oC and 800 mmHg is 76cm2. Calculate its volume at s.t.p
• A. 100.0 cm3
• B. 72.8 cm3
• C. 60.0 cm3
• D. 36.4 cm3

20. 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 handles is slowly pushed downward at constant temperature
• A. momentum of air molecules are increased.
• B. volume occupied by the molecules are increased
• C. frequency of collision of the air molecules with the walls of the pump is increased
• D. more air molecules are colliding with one another in the system

21. Ice of mass 10g at 5oC was completely converted to water at 0oC, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg-1K-1, specific latent heat of fusion of ice = 336 Jg-1]
• A. 105J
• B. 3255J
• C. 3265J
• D. 16821J

22. An electric heater has a resistance of 50Ω. 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
• A. 400J
• B. 1600J
• C. 24000J
• D. 96000J

23. When salt is dissolved in water, the freezing point of the water
• A. increases
• B. decreases
• C. remains the same
• D. increases and later decrease

24. The diagram above illustrates a waveform. Which of the points on the waveform are in phased
• A. increases
• B. decreases
• C. remains the same
• D. increases and later decrease

25. the equation of a certain progressive transverse wave is y = 2 sin 2 π(10.01−x30), where x and y are in cm and t in seconds. Calculate the period of the wave
• A. 0.001s
• B. 0.010s
• C. 10.000s
• D. 100.000s

26. 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?
• A. at the centre of curvature
• B. at the principal focus
• C. between the pole and principal focus
• D. between the centre of curvature and principal focus

27. Images formed by a convex mirror are always
• A. magnified
• B. behind the mirror
• C. real
• D. inverted

28. The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface
• A. 19o
• B. 21o
• C. 39o
• D. 42o

29. A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance
• A. 10cm
• B. 12cm
• C. 50cm
• D. 60cm

30. Which of the following statements about the Galilean telescope is not correct?
• A. the final image is inverted
• B. it is shorter than terrestial telescope
• C. the final image is erect
• D. it has a small field of view

31. Which of the following radiations has it’s frequency lower than that of infrared radiation?
• A. Ultra-violet rays
• B. gamma rays
• C. x-rays
• D. radio waves

32. a string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled
• A. 14Hz
• B. 18Hz
• C. 28Hz
• D. 56Hz

33. Which of the following statements about waves in pipes is correct?
• A. for open pipes, there is only one end correction to be accounted for
• B. for closed pipes, there are two end corrections to be accounted for
• C. only odd harmonics are possible in closed pipes
• D. all harmonics are possible in closed pipes

34. When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?
• A. negative charges flows to the ground through the person’s body
• B. positive charges flow from the ground through his body to neutralize the negative charges
• C. positive charges in the air neutralizes the negative charges the person is holding
• D. negative charges will leak through the air

35. a charge of 2.0 x 10-5C experiences a force of 80N in a uniform electric field. Calculate the magnitude of the electric field intensity
• A. 8.0 x 106 NC-1
• B. 4.0 x 106 NC-1
• C. 4.0 x 104 NC-1
• D. 2.0 x 104 NC-1

36. An electric circuit is connected as illustrated above. Determine the equivalent emf and current flowing through the circuit respectively, neglecting the internal resistance of the cells.
• A. 2V, 1.0A
• B. 2V, 4.0A
• C. 6V, 0.3A
• D. 6V, 3.0A

37. A potential difference of 12V is applied across the ends of a 6Ω resistor for 10 minutes. Determine the quantity of heat generated
• A. 720J
• B. 1200J
• C. 14400J
• D. 43200J

38. A galvanometer of internal resistance of 10 Ω has a full scale deflection with a current of 10mA. Calculate the magnitude of the resistance required to convert it to a voltmeter capable of measuring up to 3V.
• A. 290Ω
• B. 300Ω
• C. 333Ω
• D. 1000Ω

39. Which of the following instruments is used to determine the accurate value of the electromotive force of a cell?
• A. voltmeter
• B. meterbridge
• C. voltameter
• D. potentiometer

40. The direction of motion of a current-carrying conductor placed within the opposite poles of a magnet is determined using.
• A. Fleming’s left hand rule
• B. Fleming’s right hand rule
• C. Maxwell’s corkscrew rule
• D. Ampere’s rule

41. Two straight current-carying conductors are placed near each other. Which of the following diagrams correctly illustrates the magnetic field pattern formed by the conductor.

42. The capacitance of parallel plates capacitors varies
• A. inversely as the square of the distance between the plates
• B. directly as the square of the distance between the plates
• C. inversely as the distance between the plates
• D. directly as the distance between the plate

43. Which of the following devices works on the principle of electromagnetic induction?
• A. carbon microphone
• B. Electric heater
• C. moving iron ammeter
• D. simple d.c motor

44. Which of the following devices does not makes use of eddy current for its action? A/An
• A. galvanometer
• B. speedometer
• C. induction furnace
• D. speedometer

45. A coil of inductance 0.12 H and resistance 4Ω, is connected across a 240V, 50Hz supply. Calculate the current through it. [π= 3.142]
• A. 6.3A
• B. 33.3A
• C. 37.2A
• D. 40.0A

46. 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]
• A. 5.56 x 1019Hz
• B. 1.66 x 1019Hz
• C. 1.12 x 1015Hz
• D. 8.42 x 1014Hz

47. The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called
• A. critical energy
• B. ionization energy
• C. work function
• D. planck’s constant

48. Which of the following particles are termed nucleons in a neutral atom?
• A. protons and neutrons
• B. neutrons and electrons
• C. protons and electrons
• D. protons, electrons and neutrons

49. Which of the following statements about the use of radioisotopes is not correct? They are used to
• A. induce mutations in plants and animals to obtain new and improved varieties
• B. trace the paths of metabolic processes in plants and animals
• C. estimate the age of rocks
• D. locate broken bones

50. Which of the following phenomena supports the theory that waves have a particle nature?
• A. electron diffraction
• B. photoelectric effect
• C. diffraction of light
• D. x-ray interference

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