Physics Past Questions v32 for (JAMB/WAEC/NECO)

Physics Past Questions v32 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 v32 For (JAMB/WAEC/NECO)

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#1. X rays can be used in the study of crystal structure because they X rays can be used in the study of crystal structure because they

A) have a very long-reaching wavelength B) have extremely short wavelength C) are invisible D) are very fast) have a very long-reaching wavelength

B) have extremely short wavelength

C) are invisible

D) are very fast

#2. A moving coil galvanometer has a full-scale deflection of 3A equivalent to 30o deflection. The sensitivity of the instrument is

A) 33.0

B) 0.1

C) 90.0

D) 10.0

#3. The particle and wave nature of matter are demonstrated in the equation

A) λ = hc/E

B) λ = h/P

C) λ = c/f

D) λ = 2 d sin θ

#4. In a reverse biased junction diode, current flows in by

A) positive holes alone

B) majority carriers

C) electron alone

D) minority carriers

#5. A generator manufacturing company was contracted to produce an a.c dynamo but inadvertently produced a d.c dynamo. To correct this error, the

A) armature coil should be made of silver

B) commutator should be replaced with slip ring

C) commutator should be replaced with split rings

D) armature coil should be made of aluminium

#6. A radioisotope has a decay constant of 10-7s-1. The average life of the radioisotope is

A) 1.00 x 107s

B) 6.93 x 108s

C) 1.00 x 10-7s

D) 6.93 x107s

#7. An a.c circuit of e.m.f 12V has a resistor of resistance 8Ω connected in series to an inductor of inductive reactance 16Ω and a capacitor capacitive reactance 10Ω. The current flow in the circuit is

A) 1.4A

B) 1.2A

C) 12.0A

D) 14.0A

#8. 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

#9. A force acting on a body causes a change in the momentum of a body from 12 kg ms-1 to 16kg ms-1 in 0.25. Calculate the magnitude of the impulse

A) 28.0Ns

B) 20.0Ns

C) 4.0Ns

D) 0.8Ns

#10. Which of the following statements about X-rays is not correct? They

A) are electromagnetic waves

B) can be used to study crystal lattice

C) can destroy living cells

D) are produced from the nucleus of an atom

#11. A radioactive substance has a half-life of 3 days. If a mass of 1.55g of this substance is left after decaying for 15 days, determine the original value of the mass

A) 49.6g

B) 37.2g

C) 24.8g

D) 12.4g

#12. In an experiment using a converging lens to produce real images on a screen, the linear magnification m, is plotted against the image distance v, as illustrated in the diagram below. The distance OP represents the

A) focal legth of the lens

B) thickness of the lens

C) radius of curvature of the lens

D) diameter of the lens

#13. The main function of the mouth piece of a telephone is that it converts sound energy to

A) mechanical energy

B) electrical energy

C) chemical energy

D) thermal energy

#14. An atom is normally electrically neutral because the

A) number of electrons is equal to the number of protons

B) number of electrons is equal to the number of neutrons

C) number of protons is equal to the number of neutrons

D) electrons of the atom are buried deeply in the nucleus

#15. In which of the following devices is the principle of photoelectric effect not applicable?

A) close-circuit television camera

B) burglar alarm

C) solar cells

D) periscope

#16. 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

#17. A force acting on a body causes a change in the momentum of a body from 12 kg ms-1 to 16kg ms-1 in 0.25. Calculate the magnitude of the impulse

A) 28.0Ns

B) 20.0Ns

C) 4.0Ns

D) 0.8Ns)

#18. Which of the following statements about X-rays is not correct? They

A) are electromagnetic waves

B) can be used to study crystal lattice

C) can destroy living cells

D) are produced from the nucleus of an atom

#19. A radioactive substance has a half-life of 3 days. If a mass of 1.55g of this substance is left after decaying for 15 days, determine the original value of the mass

A) 49.6g

B) 37.2g

C) 24.8g

D) 12.4g

#20. In an experiment using a converging lens to produce real images on a screen, the linear magnification m, is plotted against the image distance v, as illustrated in the diagram below. The distance OP represents the

A) focal legth of the lens

B) thickness of the lens

C) radius of curvature of the lens

D) diameter of the lens

#21. The main function of the mouth piece of a telephone is that it converts sound energy to

A) mechanical energy

B) electrical energy

C) chemical energy

D) thermal energy

#22. An atom is normally electrically neutral because the

A) number of electrons is equal to the number of protons

B) number of electrons is equal to the number of neutrons

C) number of protons is equal to the number of neutrons

D) electrons of the atom are buried deeply in the nucleus

#23. In which of the following devices is the principle of photoelectric effect not applicable?

A) close-circuit television camera

B) burglar alarm

C) solar cells

D) periscope

#24. A car fuse marked 3A operates optimally on a 12V battery, calculate the resistance of the fuse

A) 36.0

B) 15.0

C) 9.0

D) 4.0

#25. Find the cost of running a 60W lamp for 24 hours. If 1kW hr cost 5 naira

A) 14.4 naira

B) 12.5 naira

C) 7.2 naira

D) 2.0 naira

#26. The quantity of electric charge stored in a capacitor is measured in

A) farad

B) ampere

C) coulomb

D) volt

#27. A girl stand 80m away from a tall cliff and blows a whistle. If the speed of sound in air is 330ms-1, how long would it take for her to hear the echo of the sound?

A) 2.062s

B) 0.970s

C) 0.485s

D) 0.242s

#28. Which of the following reasons explains why the walls and ceilings of a standard concert hall are usually covered with perforated pads? To

A) increase the intensity of sound waves

B) increases the loudness of the sound waves

C) reduce the effect of revibration of sound waves

D) decreases thr frequency of sound waves

#29. The sound from a vibrating tuning sound is when the tip of its stem is placed on a wooden table than when in air because

A) the friction between the table and the tuning fork generates additional energy B) air molecules obsorb sound wave but wood transmit sound waves C) the table increases the frequency of the turning fork D) a large mass of air is set into vibration by the table

B) air molecules obsorb sound wave but wood transmit sound waves

C) the table increases the frequency of the turning fork

D) a large mass of air is set into vibration by the table

#30. Charges on a conductor are

A) evenly distributed over a surface of any shape

B) concentrate on the inner surface of the conductor

C) concentrate at the outer flat surface of the conductor

D) generally concentrated at sharply curved surface

#31. Which of following functions is performed by manganese IV oxide in the Lenclanche cell?

A) control of local action

B) depolarisation of the cell

C) regulating current flow in the cell

D) reduction of the internal resistance of the cell

#32. A wave travelling from water to glass suffers a change in its speed at the common boundary. Which of the following properties explains this observation

A) dispersion

B) refraction

C) interference

D) diffraction

#33. The image of an optical pin placed at the principal focus of a concave mirror will be formed

A) between the principal focus and the pole

B) at the centre of the curvature

C) between the principal focus and the centre of curvature

D) at infinity

#34. A man 1.8m tall stands 3m away from a pin hole camera. If the distance between the pin hole and the screen of the camera is 0.3m. Calculate the height of the image of the man produced by the camera

A) 0.18m

B) 0.50m

C) 1.62m

D) 18.00m

#35. A magnified and virtual image of a near object is produced by

A) prism binoculas

B) astronomical telescope

C) periscope

D) simple microscope

#36. When a metal ball is heated through 30oC,its volume becomes 1.0018cm3. If the linear expansivity of the material of the ball is 2.0 x 10-5 K-1, calculate its original volume

A) 1.0000cm3

B) 1.0020cm3

C) 1.0036cm3

D) 1.0180cm3

#37. A faulty barometer reads 72.6cm Hg when the atmospheric pressure is 75.0cm Hg. Calculate the atmospheric pressure when the barometer reads 72.0cn Hg

A) 79.4cm Hg

B) 74.38cm Hg

C) 74.2cm Hg

D) 69.4cm Hg

#38. On a basis of the kinetic theory, an increase in the temperature of a fixed volume of an ideal gas causes

A) a incease in the number of gas molecules

B) a decrease in the density of the gass

C) an increase in the average speed of the gas molecules

D) a decrease in pressure exerted by the gas

#39. The temperature of 900cm3 of an ideal gas at a pressure of 114cm Hg is 27oC. Calculate its volume at 76cm Hg and 0oC

A) 50.0cm3

B) 546.0cm3

C) 659.3cm3

D) 1228.5cm3

#40. The basic difference between a transverse wave and a longitudinal wave travelling in the same direction in a medium is in the

A) amplitude of the wave

B) wavelength of the wave

C) direction of vibration of the particles of the medium

D) period of vibration of the particle of the medium

#41. A ball bearing is projected vertically upwards from the ground with a velocity of 15ms-1. Calculate the time taken by the ball to return to the ground [g = 10ms-1]

A) 1.5s

B) 3.0s

C) 5.0s

D) 7.5s

#42. A loaded spring performs simple harmonic motion with an amplitude of 5cm. If the maximum acceleration of the load is 20cm s-1, calculate the angular frequency of the motion

A) 2 rad s-1

B) 4 rad s-1

C) 5 rad s-1

D) 10 rad s-1

#43. When compared with water, mercury is preferred as a thermometric liquid because

A) has a higher density

B) has lower specific heat capacity

C) exhibits anomalous thermal expansion

D) contains molecules which have very strong adhensive forces

#44. Which of the following values on the absolute scale of temperature is the ice point?

A) 0K

B) 32K

C) 100K

D) 273k

#45. On a cold day, a concrete floor feels colder to the bear foot then a mat on the same floor because the

A) is better conductor of heat than the foot

B) mat loses heat to the bare foot at a faster rate

C) mat is better conductor of heat than the floor

D) concrete floor is a better conductor of heat than the mat

#46. A body is said to be moving with uniform acceleration if it experiences equal

A) increase in velocity at equal time intervals

B) decreases in velocity at equal time intervals

C) increases in speed at equal time intervals

D) decreases in speed at equal time intervals

#47. A body is dropped from a certain height above the ground level, falls with uniform A) speed B) velocity C) acceleration D) retardation

A) speed

B) velocity

C) acceleration

D) retardation

#48. A body of mass 8kg moving with a speed of 30ms-1 is brought to rest in 2.5s by a constant retarding force. Calculate the magnitude of the force

A) 240N

B) 96N

C) 20N

D) 9N

#49. The bob of a single pendulum has a mass of 0.02kg. Determine the weight of the bob [g = 10ms-2]

A) 0.02N

B) 0.20N

C) 20.00N

D) 200.00N

#50. A steel needle floating on water, sinks when kerosine is added to the water. This is because the kerosine

A) increased the surface tension of the water

B) reduces the density of the water

C) reduces the surface tension of the water

D) reduces the upthrust on the needle

#51. An elastic string of force constant 200N m-1 is stretched through 0.8m within its elastic limit. Calculate the energy stored in the string

A) 64.0J

B) 80.0J

C) 128.0J

D) 160.0J

#52. A machine of velocity ratio 5 is used in lifting a load with an effort of 500N. If the machine is 80% efficient. Determine the magnitude of load

A) 2500N

B) 2000N

C) 900N

D) 625N

#53. The speed of an object in rectilinear motion can be determine from the

A) area under a velocity-time graph

B) area under a distance-time graph

C) slope of a distance-time graph

D) slope of a velocity-time graph

#54. Calculate the change in volume when 90g of ice is completely melted. [density of water = 1g cm-3, density of ice = 0.9cm-3]

A) 0.00cm3

B) 9.00cm3

C) 10.00cm3

D) 90.00cm3

#55. The diagram above represent displacement D, versus time, t graph of a progressive wave. Deduce the frequency of the wave

A) 20 Hz

B) 10 Hz

C) 5 Hz

D) 4 Hz

#56. A diver is 5.2m below the surface of water of density 1000Kgm-3. If the atmospheric pressure is 1.02 x 105pa. Calculate the pressure on the diver [g = 10ms-2]

A) 6.20 x 104 pa

B) 1.02 x 105 pa

C) 1.54 x 105 pa

D) 5.20 x 105 pa

#57. The molecular structure of a liquid is such that

A) the molecules have unlimited freedom of movement

B) molecular movement is restricted to vibration only

C) intermolecular collisions take place

D) all molecules moves move with the same speed

#58. An object weighs 60.0N in air, 48.2N in a certain liquid X, and 44.9N in water, Calculate the relative density of X

A) 3.300

B) 1.279

C) 0.932

D) 0.782

#59. Which of the following statements is not correct?

A) Heat energy can be transformed into mechanical energy

B) That total heat content of a body is the sum of the kinetic energies of its molecules

C) lf a body is heated, its molecules move faster.

D) lf a body is cooled, molecular movement remains constant.

#60. A charge of 1.6 x 10-10C is placed in a uniform electric field of intensity 2.0 x 105NC-1. What is the magnitude of the electric force exerted on the charge?

A) 3.2 x105N

B) 1.8 x105N

C) 3.2 x10-5N

D) 1.8 x10-5N

E) 4.0X10-6N

#61. According to the kinetic theory of gases the collision Of the molecules of a gas with the wall of the container Is mainly responsible for the l. temperature of the Gas ll. viscosity of the gas Ill. pressure of the gas Which of the statements above is/are correct?

A) I only

B) II only

C) III only

D) II and III only

E) I, II and III.

#62. Which of the following is not an evidence of the particle nature of matter?

A) Diffusion

B) Brownian motion

C) Diffraction

D) Crystal structure

E) Photoelectricity

#63. I. Jet propelled aircraft II. Rocket propulsion III. The recoil of a gun IV. A person walking Which of the above is based on Newton's third law of motion

A) I and II only

B) I, II, III, and IV only

C) I and III only

D) I, II and III only

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