Physics Past Questions v21 For (JAMB/WAEC/NECO); These Physics past questions are for students who are sitting for the following examinations

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#1. An object of mass 5.0 cg moving with a velocity of 12ms-1 due north hits a stationary body of mass 7.0kg. If they stick together after collision and move with velocity V due north, calculate the magnitude of V.

A) 12ms-1

A) 12ms-1

B) 7ms-1

B) 7ms-1

C) 6ms-1

C) 6ms-1

D) 5ms-1

D) 5ms-1

E) 4ms-1

E) 4ms-1

#2. The distance between two successive crests of a water wave is 0.5m. If a particle on the surface of the water wave makes two complete vertical oscillations in 1s, calculate the speed of the wave.

A) 0.25ms-1

A) 0.25ms-1

B) 0.50ms-1

B) 0.50ms-1

C) 1.00ms-1

C) 1.00ms-1

D) 2.00ms-1

D) 2.00ms-1

E) 4.00ms-1

E) 4.00ms-1

#3. A platinum-resistance thermometer has a resistance of 4Ω at 0°C and 12Ω at 100°C. Assuming that the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45°C.

A) 6.0Ω

A) 6.0Ω

B) 6.42Ω

B) 6.42Ω

C) 7.6Ω

C) 7.6Ω

D) 8.4Ω

D) 8.4Ω

E) 16.0Ω

E) 16.0Ω

#4. The resistance of a series R-C circuit is 5 ω If the impedance of the circuit is 13 ω calculate the reactance of the capacitor

A) 12 Ω

A) 12 Ω

B) 14 Ω

B) 14 Ω

C) 16 Ω

C) 16 Ω

D) 18 Ω

D) 18 Ω

E) 65 Ω

E) 65 Ω

#5. A wire of length 100cm and cross-sectional area 2.0 × 10-3cm2 has a resistance of 0.10 ω. Calculate its electrical conductively.

A) 2.0 × 10-6 ω-1cm-1

A) 2.0 × 10-6 ω-1cm-1

B) 5.0 × 10-5 ω-1cm-1

B) 5.0 × 10-5 ω-1cm-1

C) 2.0 × 106 ω-1cm-1

C) 2.0 × 106 ω-1cm-1

D) 5.0 × 106 ω-1cm-1

D) 5.0 × 106 ω-1cm-1

E) 5.0 × 107 ω-1cm-1

E) 5.0 × 107 ω-1cm-1

#6. A converging lens of focal length 5cm forms a virtual image which is 20cm from the lens. How far from the lens is the object?

A) 2.0cm

A) 2.0cm

B) 4.0 cm

B) 4.0 cm

C) 6.7cm

C) 6.7cm

D) 20.0cm

D) 20.0cm

E) 25.0cm

E) 25.0cm

#7. Lenz's law of electromagnetic induction states that

A) a force is exerted on a current-carrying conductor in a magnetic field

A) a force is exerted on a current-carrying conductor in a magnetic field

B) electromotive force id induced in a circuit whenever there is a change in the magnetic flux linked with the circuit

B) electromotive force id induced in a circuit whenever there is a change in the magnetic flux linked with the circuit

C) the magnitude of the induced electromotive force in a circuit is proportional to the rate of change of flux linking the circuit

C) the magnitude of the induced electromotive force in a circuit is proportional to the rate of change of flux linking the circuit

D) the induced current in a coil is in such a direction that it sets up a magnetic field which opposes the change producing it

D) the induced current in a coil is in such a direction that it sets up a magnetic field which opposes the change producing it

#8. a ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2m-1 and rebounds with the same speed. Determine the impulse experienced by the ball

A) 20.0kgm-1

A) 20.0kgm-1

B) 5.0kgm-1

B) 5.0kgm-1

C) 1.3kgm-1

C) 1.3kgm-1

D) 0.0kgm-1

D) 0.0kgm-1

E) 10.0kgm-1

E) 10.0kgm-1

#9. Which of the following statements is not correct? Isotopes of an element have

A) the same number of electric charges on the nucleus

A) the same number of electric charges on the nucleus

B) the same chemical properties

B) the same chemical properties

C) different nucleon numbers

C) different nucleon numbers

D) different proton numbers

D) different proton numbers

E) different atomic masses

E) different atomic masses

#10. Which of the following particles/rays do not originate from the nucleus of an atom?

A) Alpha particles

A) Alpha particles

B) Beta particles

B) Beta particles

C) Neutrons

C) Neutrons

D) Gamma rays

D) Gamma rays

E) X-rays

E) X-rays

#11. The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days, what would be the count rate per minute after 15 days?

A) 20

A) 20

B) 25

B) 25

C) 50

C) 50

D) 200

D) 200

E) 400

E) 400

#12. What is the decay constant of a radioactive element whose half-life is 3 seconds

A) 0.132s-1

A) 0.132s-1

B) 0.23s-1

B) 0.23s-1

C) 0.347s-1

C) 0.347s-1

D) 0.693s-1

D) 0.693s-1

E) 0.924s-1

E) 0.924s-1

#13. Which of the following substances is most viscous at room temperature?

A) Water

A) Water

B) Alcohol

B) Alcohol

C) Petrol

C) Petrol

D) Palm oil

D) Palm oil

E) Kerosine

E) Kerosine

#14. Which of the following is not part of the electromagnetic spectrum?

A) Radio wave

A) Radio wave

B) Gamma ray

B) Gamma ray

C) Infra-red ray

C) Infra-red ray

D) Alpha particle

D) Alpha particle

E) X-ray.

E) X-ray.

#15. The diagram above illustrates an isolated metal sphere carrying charge W in a medium whose permittivity is so. The magnitude of the electric field intensity at P can be expressed as

A) Q2/(4πεor2)

A) Q2/(4πεor2)

B) Q/(4πεor2)

B) Q/(4πεor2)

C) Q/(4πεor)

C) Q/(4πεor)

D) Q2/(4πεor2)

D) Q2/(4πεor2)

E) Q/(4πεor) 2

E) Q/(4πεor) 2

#16. The electric potential at point P in the diagram above can be expressed as

A) Q2/(4πεor2)

A) Q2/(4πεor2)

B) Q/(4πεor2)

B) Q/(4πεor2)

C) Q/(4πεor)

C) Q/(4πεor)

D) Q2/(4πεor2)

D) Q2/(4πεor2)

E) Q/(4πεor) 2

E) Q/(4πεor) 2

#17. Calculate the amount of heat generated in an external load of resistance 89 if an alternating current of peak value 5A is passed through for 100s.

A) 20,000J

A) 20,000J

B) 10,000J

B) 10,000J

C) 5,000J

C) 5,000J

D) 4,000J

D) 4,000J

E) 200J

E) 200J

#18. ln the diagram above, the resistor has a resistance 8 Ω while the reactances of the inductor and the capacitor are 10 Ω and 16 Ω respectively Calculate the current in the circuit

A) 3.6A

A) 3.6A

B) 3.8A

B) 3.8A

C) 9.2A

C) 9.2A

D) 10.0A

D) 10.0A

E) 13.0A

E) 13.0A

#19. The resistance in a series R-C circuit is 5 Ω. If the impedance of the circuit is 13 Ω, calculate the reactance of the capacitor

A) 65 Ω

A) 65 Ω

B) 18 Ω

B) 18 Ω

C) 16 Ω

C) 16 Ω

D) 14 Ω

D) 14 Ω

E) 12 Ω

E) 12 Ω

#20. The diagram above illustrates the conversion of a galvanometer of resistance 2Ω to an ammeter. The galvanometer gives a full-scale deflection for a current of 10mA. Calculate the value of R.

A) 2.0 x 103 Ω

A) 2.0 x 103 Ω

B) 2.0 x 102 Ω

B) 2.0 x 102 Ω

C) 2.0 x 10-1 Ω

C) 2.0 x 10-1 Ω

D) 2.0 x 10-2 Ω

D) 2.0 x 10-2 Ω

E) 2.0 x 10-3 Ω

E) 2.0 x 10-3 Ω

#21. A wire of length 100cm and cross-sectional area of 2.0 x 10-3cm2 has a resistance of 0.10 Ω. Calculate its electrical conductivity.

A) 5.0 x 107Ω-1cm-1

A) 5.0 x 107Ω-1cm-1

B) 5.0 x 106Ω-1cm-1

B) 5.0 x 106Ω-1cm-1

C) 2.0 x 106Ω-1cm-1

C) 2.0 x 106Ω-1cm-1

D) 5.0 x 105Ω-1cm-1

D) 5.0 x 105Ω-1cm-1

E) 2.0 x 106Ω-1cm-1

E) 2.0 x 106Ω-1cm-1

#22. A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 39. A high-resistance voltmeter connected across the cell registers only 0.9V. Calculate the internal resistance of the cell

A) 1.85Ω

A) 1.85Ω

B) 2.0Ω

B) 2.0Ω

C) 2.4Ω

C) 2.4Ω

D) 4.5Ω

D) 4.5Ω

E) 5.0Ω

E) 5.0Ω

#23. Soft iron is used in making the armature of an electric bell because it

A) retains its magnetism for a longtime

A) retains its magnetism for a longtime

B) Loses its magnetism readily

B) Loses its magnetism readily

C) Produces permanent magnets

C) Produces permanent magnets

D) is not easily magnetised

D) is not easily magnetised

E) decreases the magnetic effect of a direct current

E) decreases the magnetic effect of a direct current

#24. The diagram above illustrates a variation of the displacement y of a wave particle with time t. lf the velocity of wave is 250ms-1, calculate the distance between two successive particles which are in phase

A) 20m

A) 20m

B) 2.5m

B) 2.5m

C) 3.0m

C) 3.0m

D) 5.0m

D) 5.0m

E) 50.0m

E) 50.0m

#25. The diagram above represents a stationary wave set up in a string which is fixed at both ends. lf the frequency of the wave is 256Hz and the distance N1 N2 equals 1.5m, calculate the speed of the wave.

A) 128ms-1

A) 128ms-1

B) 192ms-1

B) 192ms-1

C) 384ms-1

C) 384ms-1

D) 768ms-1

D) 768ms-1

E) 1536ms-1

E) 1536ms-1

#26. CalcuIate the power delivered by a 3-phase line if its voltage and current at 132KV and 60A respectively.

A) 2.38 x 107W

A) 2.38 x 107W

B) 7.92 x 106W

B) 7.92 x 106W

C) 3.96 x 106W

C) 3.96 x 106W

D) 2.64 x 106W

D) 2.64 x 106W

E) 7.92 x 104W

E) 7.92 x 104W

#27. Which of the following is not a component of a d.c. electric motor?

A) Commutator

A) Commutator

B) Field magnets

B) Field magnets

C) Slip rings

C) Slip rings

D) Armature

D) Armature

E) Carbon brushes

E) Carbon brushes

#28. The walls and ceilings of many standard auditoria are covered with perforated pads to

A) increase the intensity of sound waves

A) increase the intensity of sound waves

B) increase the loudness of sound waves

B) increase the loudness of sound waves

C) reduce the effect of reverberations of sound waves

C) reduce the effect of reverberations of sound waves

D) increase the interference effect of sound waves

D) increase the interference effect of sound waves

E) decrease the frequency of sound waves.

E) decrease the frequency of sound waves.

#29. A string of length 1.0 m vibrates in 10 loops. If the total mass of the string is 1.0 x 10-3 kg and the tension in it is 10N, calculate the frequency of the vibration.

A) 50Hz

A) 50Hz

B) 100Hz

B) 100Hz

C) 250Hz

C) 250Hz

D) 400Hz

D) 400Hz

E) 500Hz

E) 500Hz

#30. The distance between two successive crests of a water is 1m. lf a particle on the surface of the water makes two complete vertical oscillations in 1 second, calculate the speed of the wave

A) 0.5 ms-1

A) 0.5 ms-1

B) 1.0 ms-1

B) 1.0 ms-1

C) 2.0ms-1

C) 2.0ms-1

D) 3.0ms-1

D) 3.0ms-1

E) 4.0ms-1

E) 4.0ms-1

#31. A sound wave of velocity 350 ms-1 is directed towards the surface of water. lf the ratio of the wavelength of sound in water to that in air is 425:100, calculate the velocity on the wave in water

A) 82.4ms-1

A) 82.4ms-1

B) 148.8ms-1

B) 148.8ms-1

C) 350.0ms-1

C) 350.0ms-1

D) 1487.5ms-1

D) 1487.5ms-1

E) 3500.5ms-1.

E) 3500.5ms-1.

#32. The speed of sound in air is 330ms-1. How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash? (Neglect the time taken by light to travel to the observer)

A) 1320m

A) 1320m

B) 660m

B) 660m

C) 600m

C) 600m

D) 330m

D) 330m

E) 165m

E) 165m

#33. A ray of light is incident on a glass block as shown in the diagram above. If the reflected and the retracted rays are perpendicular to each other, what is the refractive index of the glass relative to air.?

A) 1.60

A) 1.60

B) 1.58

B) 1.58

C) 1.52

C) 1.52

D) 1.50

D) 1.50

E) 1.48

E) 1.48

#34. When a ray of light is incident normally on an air- glass interface, its angle of refraction is

A) 0o

A) 0o

B) 42o

B) 42o

C) 45o

C) 45o

D) 60o

D) 60o

E) 90o

E) 90o

#35. The refractive index of a medium relative to air is 1.8. Calculate the critical angle for the medium to the nearest degree.

A) 18o

A) 18o

B) 34o

B) 34o

C) 45o

C) 45o

D) 68o

D) 68o

E) 90o.

E) 90o.

#36. A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object?

A) 2.0cm

A) 2.0cm

B) 3.3cm

B) 3.3cm

C) 5.0cm

C) 5.0cm

D) 10.0cm

D) 10.0cm

E) 15.0cm

E) 15.0cm

#37. Which of the following instruments produces sound by the vibration of air column?

A) Piano

A) Piano

B) Guitar

B) Guitar

C) Flute

C) Flute

D) Hand bell

D) Hand bell

E) Talking drum

E) Talking drum

#38. In which of the following media would sound waves travel fastest?

A) Kerosine

A) Kerosine

B) Alcohol

B) Alcohol

C) Water

C) Water

D) lron

D) lron

E) Air

E) Air

#39. A ray of light strikes a plane mirror at a glancing angle of 50o. Calculate the angle between the incident and reflected rays

A) 20o

A) 20o

B) 40o

B) 40o

C) 50o

C) 50o

D) 80o

D) 80o

E) 100o.

E) 100o.

#40. A boy walks away from a plane mirror at a speed of 3 ms-1 in a direction normal to the surface of the mirror.

A) 8 9.0ms-1

A) 8 9.0ms-1

B) 6.0ms-1

B) 6.0ms-1

C) 4.5ms-1

C) 4.5ms-1

D) 1.5ms-1

D) 1.5ms-1

E) 0.0ms-1

E) 0.0ms-1

#41. The graph above shows the relationship between sin i and sin r for a ray of light in air incident on a liquid surface. If i and r are respectively angles of incidence and refraction, deduce the refractive index of the liquid from the graph

A) 1.63

A) 1.63

B) 1.50

B) 1.50

C) 1.33

C) 1.33

D) 1.25

D) 1.25

E) 0.08

E) 0.08

#42. When a ray of light is incident normally on an air- glass interface, its angle of refraction is

A) 0o

A) 0o

B) 42o

B) 42o

C) 45o

C) 45o

D) 60o

D) 60o

E) 90o.

E) 90o.

#43. The inside of a vacuum flask is usually coated with silver to reduce heat lost by

A) convection

A) convection

B) conduction

B) conduction

C) radiation

C) radiation

D) absorption

D) absorption

E) evaporation

E) evaporation

#44. The saturated vapour pressure of a liquid increases as the

A) volume of the liquid increases

A) volume of the liquid increases

B) volume of the liquid decreases

B) volume of the liquid decreases

C) temperature of the liquid increases

C) temperature of the liquid increases

D) temperature of the liquid decreases

D) temperature of the liquid decreases

E) mass of the liquid decreases

E) mass of the liquid decreases

#45. Cloud formation is the direct result of

A) precipitation

A) precipitation

B) vaporization

B) vaporization

C) fusion

C) fusion

D) sublimation

D) sublimation

E) condensation

E) condensation

#46. Water boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of the mountain the

A) saturation vapour pressure of water is higher than at sea-level

A) saturation vapour pressure of water is higher than at sea-level

B) sun adds more heat to the water

B) sun adds more heat to the water

C) temperature is lower than at sea- level

C) temperature is lower than at sea- level

D) relative humidity of the atmosphere is lower

D) relative humidity of the atmosphere is lower

E) pressure of the atmosphere is lower

E) pressure of the atmosphere is lower

#47. The main reason why rice cooks faster in a pressure cooker than in cooking pot is that

A) less heat escapes from the cooker

A) less heat escapes from the cooker

B) the vapour pressure in the cooker is constant

B) the vapour pressure in the cooker is constant

C) the rice is not affected by the draught over the cooker

C) the rice is not affected by the draught over the cooker

D) the vapour pressure in the cooker decreases

D) the vapour pressure in the cooker decreases

E) the boiling point of water in the cooker is raised.

E) the boiling point of water in the cooker is raised.

#48. The pressure of a fixed mass of gas is 2.0 x 105Nm-2 at a known temperature. Assuming that the temperature remains constant, what will be the pressure of the gas if its volume is halved?

A) 1.0x105Nm-2

A) 1.0x105Nm-2

B) 2.0X105Nm-2

B) 2.0X105Nm-2

C) 3.0x105Nm-2

C) 3.0x105Nm-2

D) 4.0 x105Nm-2

D) 4.0 x105Nm-2

E) 5.0 x105Nm-2

E) 5.0 x105Nm-2

#49. A 400W immersion heater is used to heat a liquid of mass 0.5kg. lf the temperature of the liquid increases by 2.5oC in one second, calculate the specific heat capacity of the liquid (Neglect heat losses to the surroundings)

A) 80 Jkg-1K-1

A) 80 Jkg-1K-1

B) 320Jkg-1K-1

B) 320Jkg-1K-1

C) 500Jkg-1K-1

C) 500Jkg-1K-1

D) 1200J kg-1K-1

D) 1200J kg-1K-1

E) 2000J kg-1K-1.

E) 2000J kg-1K-1.

#50. What is the difference in the amount of heat given out by 4kg of steam and 4kg of water when both are cooled from 100oC to 80oC? (Specific latent heat of steam = 2.260,000J kg-1) (Specific heat capacity of water =4,200 J kg-1)

A) 336,000J

A) 336,000J

B) 672,000J

B) 672,000J

C) 8,704,000J

C) 8,704,000J

D) 9,040,000J

D) 9,040,000J

E) 9,376,000J

E) 9,376,000J

#51. A body of mass 2kg is suspended from the ceiling of a lift with a light inextensible string. lf the lift moves upwards with acceleration of 2ms-2, calculate the magnitude of the tension in the string (g = 10ms-2)

A) 24N

A) 24N

B) 20N

B) 20N

C) 16N

C) 16N

D) 4N

D) 4N

E)0N

E)0N

#52. A stationary object of mass 4kg is set in motion by a net force of 5ON. If the object attains is speed of 5ms-1 in time. Calculate the value of t.

A) 0.20s

A) 0.20s

B) 0.40s

B) 0.40s

C) 0.63s

C) 0.63s

D) 0.80s

D) 0.80s

E) 1.30s

E) 1.30s

#53. A platinum-resistance thermometer has a resistance of 59 at 0oC and 9Ω at l00oC. Assuming that resistance changes uniformly with temperature, calculate the resistance of the thermometer when the temperature is 45oC

A) 13.9 Ω

A) 13.9 Ω

B) 8.9 Ω

B) 8.9 Ω

C) 6.8 Ω

C) 6.8 Ω

D) 3.2 Ω

D) 3.2 Ω

E) 1.8 Ω

E) 1.8 Ω

#54. The linear expansivity of a metal P is twice that of another metal Q. When these materials are heated through the same temperature change, their increase in length is the same. Calculate the ratio of the original length of P to that of Q.

A) 1:4

A) 1:4

B) 1:2

B) 1:2

C) 2:1

C) 2:1

D) 4:1

D) 4:1

E) 6:1

E) 6:1

#55. A rocket is launched from the surface of the earth. If the radius of the earth is 6.4 x 106m and the acceleration of free fall due to gravity is 1Oms-1 calculate the escape velocity of the rocket.

A) 2.53 x 104ms-1

A) 2.53 x 104ms-1

B) 1.13 x 104ms

B) 1.13 x 104ms

C) 8.00 x 103ms-1

C) 8.00 x 103ms-1

D) 4.23 x 103ms-1

D) 4.23 x 103ms-1

E) 6.41 x 104ms-1

E) 6.41 x 104ms-1

#56. The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms-2)

A) 25N

A) 25N

B) 90N

B) 90N

C) 96N

C) 96N

D) 250N

D) 250N

E) 960N

E) 960N

#57. Two spanners X and Y of lengths 15cm and 20cm respectively are used in turn to give a screw of pitch 2mm one complete rotation. If Rx and Ry are the respective velocity ratios of the spanners then the ratio Rx : Ry is

A) 1 : 50

A) 1 : 50

B) 3 : 20

B) 3 : 20

C) 3:4

C) 3:4

D) 4:3

D) 4:3

E) 20:3

E) 20:3

#58. The magnitude of the force required to make an object of mass M move with speed V in a circular path of radius R is given by the expression.

A) mr/v

A) mr/v

B) (mr) 2/v

B) (mr) 2/v

C) mv2/r

C) mv2/r

D) mv/2

D) mv/2

E) mv/r

E) mv/r

#59. A body of mass 4.2kg moving with velocity 10ms-1 due east, hits a stationary body of mass 2.8kg. If they stick together after collision and move with velocity V due east, calculate the value of V

A) 3ms-1

A) 3ms-1

B) 6ms-1

B) 6ms-1

C) 7ms-1

C) 7ms-1

D) 15ms-1

D) 15ms-1

E) 17ms-1

E) 17ms-1

#60. The diagram above represents a portion of a micrometer screw gauge in which the horizontal scale is in millimetres. What is the reading on the instrument?

A) 3.72mm

A) 3.72mm

B) 3.50mm

B) 3.50mm

C) 3.30mm

C) 3.30mm

D) 3.28mm

D) 3.28mm

E) 3.2 2mm

E) 3.2 2mm

#61. A loaded test-tube which floats upright in water is carefully and slightly depressed and then released. Which of the following best describes the sub-sequent motion of the test-tube?

A) Circular

A) Circular

B) Rotational

B) Rotational

C) Random

C) Random

D) Oscillatory

D) Oscillatory

E) Translational

E) Translational

#62. The diagram above illustrates the velocity-time graph of the motion of a body. Calculate the total distance covered by the body

A) 50m

A) 50m

B) 65m

B) 65m

C) 175m

C) 175m

D) 225m

D) 225m

E) 300m

E) 300m

#63. Which of the following is used a nuclear reactor to slow down fast moving neutrons?

A) Carbondioxide gas

A) Carbondioxide gas

B) Liquid sodium metal

B) Liquid sodium metal

C) Concrete shield

C) Concrete shield

D) Graphite rods

D) Graphite rods

E) Boron rods

E) Boron rods

#64. Lenz’s law of electromagnetic induction states that

A) electromotive force is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit

A) electromotive force is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit

B) the induced current in a conductor is in such a direction as to oppose the change producing it

B) the induced current in a conductor is in such a direction as to oppose the change producing it

C) the induced e.m.f. in a circuit is proportional to the rate of change of number of lines of force linking the circuit

C) the induced e.m.f. in a circuit is proportional to the rate of change of number of lines of force linking the circuit

D) a force is exerted on a current carrying conductor in a magnetic field

D) a force is exerted on a current carrying conductor in a magnetic field

E) the induced e.m.f. is proportional to the current producing the magnetic flux.

E) the induced e.m.f. is proportional to the current producing the magnetic flux.

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