Physics Past Questions v49 For (JAMB/WAEC/NECO); These Physics past questions are for students who are sitting for the following examinations
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Physics Past Questions v49 For (JAMB/WAEC/NECO)
#1. When a brick is taken from the earth's surface to the moon, its mass
#2. The bond between silicon and germanium is
#3. The energy of a photo having a wavelength of 10-10m is (h= 6.63 x 10 -34Js, c =3.0 x 10 8ms-1)
#4. Induced emfs are best explained using
#5. If a current of 2.5A flows through an electrolyte for 3 hours and 1.8g of a substance is deposited, what is the mass of the substance that will be deposited if a current of 4A flows through it for 4.8 hours?
#6. Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV
#7. In photo-emission, the number of photo-electrons ejected per second depends on the
#8. The particle nature of light is demonstrated by the
#9. Which of the following obeys ohms laws?
#10. A house has ten 40W and five 100W bulbs. How much will it cost the owner of the house to keep them lit for 10 hours if the cost of a unit is 5N?
#11. An electric device is rated 2000W, 250V. Calculate the maximum current it can take
#12. When a charge moves through an electric circuit in the direction of an electric force, it
#13. To convert a galvanometer to a voltmeter, a
#14. If the linear magnification of the objective and eyepiece convex lenses of a compound microscope are 4 and 7 respectively. Calculate the angular magnification of the microscope
#15. The angle of deviation of light of various colours passing through a triangular prism increases in the order
#16. Calculate the force acting on an electron of charge 1.5 x 10-19C placed in an electric field of intensity 105Vm-1
#17. Capacitors are used in the induction coil to
#18. A cell of emf 1.5V is connected in series with a 1Ω resistor and a current of 0.3A flows through the resistor. Find the internal resistance of the cell
#19. What is the velocity of sound at 100 oC if the velocity of sound at 0 oC is 340ms -1?
#20. If a sonometer has a fundamental frequency of 450HZ, what is the frequency of the fifth overtone?
#21. A man 1.5m tall is standing 3m in front of a pinhole camera whose distance between the hole and the screen is 0.1m. What is the height of the image of the man on the screen?
#22. A ray of light passing through the centre of curvature of a concave mirror is reflected by the mirror at
#23. Total internal reflection will not occur when light travels from
#24. What will happen to the boiling point of pure water when it is heated in a place 30m below sea level?
#25. The rise or fall of a liquid in a narrow tube is because of the
#26. The mechanism of heat transfer from one point to another through the vibration of the molecules of the medium is
#27. A wave that travels through stretched strings is known as
#28. A transverse wave and a longitudinal wave travelling in the same direction in a medium differ essentially in their
#29. A wire of length 100.0m at 30o has linear expansive of 2x10-5K-1 Calculate the length of the wire at a temperature of - 10oC
#30. A gas at a pressure of 105Nm-2expands from 0.6m-3 to 1.2m3 at constant temperature, the work done is
#31. Two liquids X and Y having the same mass are supplied with the same quantity of heat. If the temperature rise in X is twice that of Y, the ratio of specific heat capacity of X to that of Y is
#32. Food cook quicker in salt water than in pure water because of the effect of
#33. Steam from boiling water causes more damage on the skin than does boiling water because
#34. What effort will a machine of efficiency 90% apply to lift a load of 180N if its efforts arm is twice as long as its load arm?
#35. Calculate the work done when a force of 20N stretches a spring by 50mm.
#36. At what depth below the sea-level would one experience a change of pressure equal to one atmosphere? Density of sea water = 1013kg-3, one atmosphere = 0.01 x 105Nm-2, g = 10ms-2
#37. What volume of alcohol will have same mass as 4.2m-3 of petrol? Density of alcohol = 8.4 x 102kgm-3, density of petrol =7.2x103kgm-3
#38. Calculate the length which corresponds to a temperature of 20oC if the ice and steam points of an unguarded thermometer are 400 mm apart
#39. Calculate the apparent weight loss of a man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-2. [g = 10ms-2]
#40. A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid? [Density of the cork = 0.25 x 103kgm-3, Density of the liquid = 1.25 x 103kgm-3]
#41. An object is moving with a velocity of 5m-1. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?
#42. If a pump is capable of lifting 5000kg of water through a vertical height of 60m in 15 min, the power of the pump is
#43. The coefficient of friction between two perfectly smooth surface is
#44. When a brick is taken from the earth's surface to the moon, its mass
#45. The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle 0f 30o with the resultant, find its magnitude.
#46. The pair of physical quantities that are scalar only are ?
#47. A train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2m-2. The time required to bring the train to a complete halt is?
#48. An electric circuit is connected as illustrated above. Determine the equivalent e.m.f and current flowing through the circuit respectively, neglecting the internal resistance of the cells
#49. Which of the following phenomena supports the theory that waves have a particle nature?
#50. 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
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