Physics Past Questions v26 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 v26 For (JAMB/WAEC/NECO)

### #1. When some ice cubes are added to a glass of warm water, the glass is cooled by a process of

### #2. The wavelength of a stationary wave is 36.0cm. What is the distance between a node and the next anti-node?

### #3. What part of the camera corresponds to the iris of the eye?

### #4. The magnetic effect of a current-carrying coil is NOT utilized in the making of a/an

### #5. An astronaut is walking on the moon where the magnitude of the acceleration due to gravity "g’ is one-sixth that on earth. Compared with their magnitudes on the earth, his mass and weight on the moon are

### #6. Which statement is NOT correct about molecules?

### #7. What is the angular velocity of an object in a horizontal circular path of radius 1.5m with a constant speed of 12ms-1?

### #8. A wave is represented by the equation y = 0.5 sin 0.4 Ω(X - 60t), where the distance (X) is measured in centimetres and time (t) in seconds. What is the wave length of the wave?

### #9. A transformer is connected to a 250 V a.c. supply. The primary coil has 5000 turns and the secondary voltage is found to be 10 V. What is the number of turns in the secondary coil?

### #10. Which statement is TRUE of a block of stone of mass m, with zero momentum?

### #11. An electron of charge a = 1.6 × 10-19C is situated in a uniform electric field of intensity 2.4 × 105 V m-1. What is the force on the electron?

### #12. Which is NOT one of the laws of solid friction?

### #13. Given the same amount of beat, a quantity of water will reach a higher temperature in a brass pot than in a clay pot of the same mass because

### #14. The main function of the commutator in a simple d.c. motor is to

### #15. An object 3.00m high is placed at a distance of 7.50m from a pin-hole camera. If the image height is 6.00 cm, what is the distance of the film from the pin-hole?

### #16. The falling of light energy on a metal such that electrons are liberated from the metal is called

### #17. The speed of sound travelling in various media increases in the order:

### #18. If N.E.P.A. charges 65 kobo per kilowatt-hour for electricity supplied to consumers, what bill would an electric iron rated at 750 watts attract when used for 24 hours?

### #19. An object is placed 15cm in front of a concave mirror of focal length 20cm. The image formed is

### #20. Which material is best for making a permanent magnet?

### #21. A 220 V, 60 Hz alternating current supply is connected to an inductor of 3.5H. What is the current passing through the inductor?

### #22. How much heat is required to convert 5.0g of ice at 0 ° C to water at the boiling point? (Specific latent heat of ice = 336Jg-1 specific heat capacity of water = 4.2Jg-1K-1)

### #23. What gives rise to the line spectra observed in atoms?

### #24. A metal has a work function of 3.0 eV. What is the threshold frequency of the metal when electrons are just liberated from the metal.(1 eV = 1.6 × 10-19J; h = 6.6 × 10-34Js)

### #25. An object placed 15cm from a converging lens forms a real image whose magnification is 2.0. What is the focal length of the lens?

### #26. Which statement about the concept of temperature is NOT true?

### #27. Which is a stringed Instrument?

### #28. The statement that the mechanical advantage of a machine is 3 means that the

### #29. What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V?

### #30. What is X in the equation given below? 42He + 94Be → 126C + X

### #31. N.N.P.C. gas cylinder containing 15kg of cooking gas was left open, and the gas emptied in 3.8 minutes, at an average speed of 20 ms-1. What force was exerted on the gas in the cylinder?

### #32. The invisible part of the spectrum of white light consists of

### #33. 50cm3 of air at a pressure of 5Nm-2 is enclosed in a metal tube by a piston. If the piston is pushed in a distance of 10cm, what will the pressure of the air become, if the cross-sectional area of the tube is 2cm-2? (Assume that the temperature remains constant throughout)

### #34. Which scientist discovered natural radioactivity?

### #35. Find the frequencies of the first three harmonics of a piano string of length 1.5m, if the velocity of the wave on the string is 120ms-1

### #36. A bread toaster uses a current of 4A when plugged in a 24oV line. it takes 1 minute to toast slices of bread. what is the energy consumed by the toaster

### #37. The diagram above shows a closed side 0.5m in a uniform electric field E in the direction shown by the arrows. What is the flux Φ for the box?

### #38. In the circuit diagram above , the ammeter reads a current of 3A when R is 5Ω and 6A when R is 2Ω. Determine the value of x

### #39. In the diagram above, determine the r.m.s current

### #40. The diagram above is a block and tackle pulley system in which an effort of 80N is use to lift a load of 240N. The efficiency of the machine is

### #41. In the diagram above , the current I is

### #42. The diagram above shows two capacitors P and Q of capacitance 2μF and 4μF respectively connected to a d.c source. The ratio of energy stored in P to Q is

### #43. The diagram above shows the capacitors C1, C2 and C3 2μF, 6μF and 3μF respectively. The potential difference across C1, C2 and C3 respectively are

### #44. The diagram above shows the capacitors C1, C2 and C3 2μF, 6μF and 3μF respectively. The potential difference across C1, C2 and C3 respectively are

### #45. The force on a current carrying conductor in a magnetic field is greatest when the

### #46. A transistor function mainly as a

### #47. Energy losses through eddy currents are reduced by using

### #48. The magnetic force on a charged particle moving with velocity v is

### #49. The current through a resistor in an a.c circuit is given as 2 sin wt. Determine the d.c. equivalent of the current

### #50. The primary coil of a transformer has N turns and is connected to a 120 V a.c. power line. If the secondary coils has 1 000 turns and a terminal voltage of 1 200 volts, what is the value of N

### #51. Which of the following metals will provide the greatest shield against ionizing radiation

### #52. The process of energy production in the sun is

### #53. At reasonance, the phase angle in an a.c. circuit is

### #54. when a piece of rectangular glass block is inserted between two parallel capacitor,at constant plate area and distance of separation, the capacitance of the capacitor will

### #55. the ratio of electrostatic force FE to gravitational force FG between two protons each of charge e and mass m, at a distance d is

### #56. A cell can supply current of 0.4 A and 0.2 A through a 4.0Ω and 10.0Ω resistors respectively. This internal resistance of the cell is

### #57. I. Low pressure. II. High pressure. III. High p.d. IV. Low p.d. Which combination of the above is true of the conduction of electricity through gases?

### #58. A resistance R is connected across the terminal of an electric cell of internal resistance 2Ω and the voltage was reduced to 3/5 of its nominal value. The value of R is

### #59. A student is at a height 4m above the ground during a thunderstorm. Give that the potential difference between the thundercloud and the ground is 107v, the electric field created by the storm is

### #60. A working electric motor takes a current of 1.5 A when the p.d across it is 250V. If its efficiency is 80%, the power output is

### #61. The cost of running five 60 W lamps and four 100 W lamps for 20 hours if electrical energy cost #10.00 per kwh is

### #62. In a Daniel cell, the depolarizer, positive and negative electrodes are respectively

### #63. The thermometric substance of an absolute thermometer is

### #64. A plane sound wave of frequency 85.5Hz and velocity 342ms-1 is reflected from a vertical wall. At what distance from the wall does the wave have antinode?

### #65. A string is fastened tightly between two walls 24cm apart. The wavelength of the second overtone is

### #66. A gas with initial volume of 2 X 10-6m3 is allowed to expand to six times its initial value at constant pressure of 2 x 105Nm-2. The work done is

### #67. A cell of internal resistance r supplies current to a 6.0Ω resistor and its efficiency is 75%. Find the value of r.

### #68. Ice cubes are added to a glass of warm water. The glass and water are cooled by

### #69. A ray of light strikes a plane mirror at an angle of incidence of 35°. If the mirror is rotated through 10°, through what angle is the reflected ray rotated?

### #70. The terrestrial telescope has one extra lens more than the astronomical telescope. The extra lens is for

### #71. The driving mirror of a car has a radius of curvature of 1m. A vehicle behind the car is 4m from the mirror. Find the image distance behind the mirror.

### #72. The pressure of a given mass of a gas changes from 200Nm-2 to 120Nm-2 while the temperature drops from 127°C to -73°C. The ratio of the final volume to the initial volume is

### #73. If a spherical metal bob of radius 3cm is fully immersed in a cylinder containing water and the water level rises by 1cm, what is the radius of the cylinder?

### #74. The resultant of two forces acting on an object is maximum if the angle between them is

### #75. I. The earth is not spherical but elliptical in shape II. Variation in latitude and longitude III. Rotation of the earth on its axis IV. Variation in the density of the earthOn which combination of the above does the weight of an object vary on the earth's surface?

### #76. The efficiency of a machine is always less than 100% because the

### #77. Which of the following consists entirely of vector quantities?

### #78. The height at which the atmosphere ceases to exist is about 80km. If the atmospheric pressure on the ground level is 760mmHg, the pressure at a height of 20km above the ground level is

### #79. A stone of mass 1kg is dropped from a height of 10m above the ground and falls freely under gravity. Its kinetic energy 5m above the ground is then equal to

### #80. Electrons passing through crystals are diffracted because they

### #81. Production of x-ray tube begins with

### #82. The Earth's magnetic equator passes through Jos in Nigeria. At Jos. the

### #83. Which of the following statements about magnetic lines of force is not correct?

### #84. The material used for constructing the core of an electromagnet is

### #85. In the circuit diagram above. Calculate the energy stored in the inductor at resonance.

### #86. 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

### #87. As the plates of a charged variable capacitor are moved closer together, the potential difference between them

### #88. What is the total energy stored by the capacitors?

### #89. Dispersion of white light by a glass prism occurs because

### #90. Which of the following statements about sound is correct?

### #91. The diagram above shows the wire of a sonometer box set into resonance by a vibrating tuning fork of frequency f, when the wire is stretched by a tension T, the resonating length of the wire is I while the wavelength of the sound produced is . Which of the following statements is not correct? The wave produced on the wire is

### #92. If the frequency of the tuning fork at resonance is 256Hz, calculate the frequency of vibration of the wire when the tension in he wire is increased to 196N

### #93. 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 shallow water

### #94. 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

### #95. Convex spherical mirrors are preferred to plane mirrors as driving mirrors because

### #96. 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

### #97. A piece of cloth appears green in sunlight. When held in red light, it will appear

### #98. 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.

### #99. The volume of an ideal gas at a pressure of 77cmHg and temperature 60oC is 24cm3. If the temperature and pressure are increased to 98oC and 81cmHg respectively, calculate the new volume of the gas.

### #100. The amount of heat given out or absorbed when a substance changes its state at a constant temperature is known as

### #101. Humidity is used to describe the amount of

### #102. Electrical resistance is a property of an electrical energy to be converted into

### #103. A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine

### #104. 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]

### #105. The amplitude of the motion of a body performing simple harmonic motion decreases with time because

### #106. The amplitude of a particle executing simple harmonic motion in 5cm while its angular frequency is 10 rad s-1. calculate the magnitude of the maximum acceleration of the particle

### #107. The time rate of change of momentum is

### #108. Which of the following statements about elastic collision is correct?

### #109. A spring balance,which is suspended from the roof of a lift, carries a mass of 1kg at its free end. If the lift accelerates upwards at 2.5ms-2, determine the reading on the spring balance. [g = 10ms-2]

### #110. An object weight 10N immersed in a liquid displaces a quantity of the liquid. If the liquid displaced weighs 6N, determine the upthrust of the object

### #111. Which of the following statements about pressure is not correct? pressure

### #112. A block weighing 15N rests on a flat surface and a horizontal force of 3N is exerted on it. Determine the friction force on the block

### #113. The apparent weight of a body wholly immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. (Density of water = 1000kgm-3, g = 10ms-3)

### #114. The saturation vapour of a liquid depends on its

### #115. Which of the following are transverse waves? I. Ripples on water II. Sound waves in air III. Light waves from the sun

### #116. In the diagram above, three identical lamps each of 100 W are connected in parallel across a potential difference of 250 V. Calculate the reading of the ammeter.

### #117. I. The earth is not spherical but elliptical in shape II. Variation in latitude and longitude III. Rotation of the earth on its axis IV. Variation in the density of the earth On which combination of the above does the weight of an object vary on the earth's surface?

### #118. A string is fastened tightly between two walls 24cm apart. The wavelength of the second overtone is

### #119. The ratio of electrostatic force FE to gravitational force FG between two protons each of charge e and mass m, at a distance d is

### #120. I. Low pressure. II. High pressure. III. High p.d. IV. Low p.d. Which combination of the above is true of the conduction of electricity through gases?

### #121. In the circuit diagram above , the ammeter reads a current of 3A when R is 5Ω and 6A when R is 2Ω. Determine the value of x.

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