Physics Past Questions v29 for (JAMB/WAEC/NECO)

Physics Past Questions v29 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 v29 For (JAMB/WAEC/NECO)

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#1. A magnetic field is said to exist at a point if a force is

A) exerted on a stationary charge at the point

A) exerted on a stationary charge at the point

B) exerted on a moving charge at the point

B) exerted on a moving charge at the point

C) deflected at the point

C) deflected at the point

D) strengthened at the point

D) strengthened at the point

#2. If the distance from a point source of sound is doubled, by what factor does the intensity decrease?

A) 4.00

A) 4.00

B) 2.00

B) 2.00

C) 0.50

C) 0.50

D) 0.25

D) 0.25

#3. A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10oC. If a temperature rise of 30oC is obtained after 10min, the heat capacity of the material is

A) 6.0 x 104JoC-1

A) 6.0 x 104JoC-1

B) 4.0 x 104JoC-1

B) 4.0 x 104JoC-1

C) 1.2 x 104JoC-1

C) 1.2 x 104JoC-1

D) 8.0 x 104JoC-1

D) 8.0 x 104JoC-1

#4. If 1.2 x 106J of heat energy is given off in 1 sec from a vessel maintained at a temperature gradient of 30Km-1, the surface area of the vessel is

A) 1.0 x 102m2

A) 1.0 x 102m2

B) 9. 0 x 102m2

B) 9. 0 x 102m2

C) 1.0 x 103m2

C) 1.0 x 103m2

D) 9.0 x 104m2

D) 9.0 x 104m2

#5. A positive charged rod X is brought near as uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that y has

A) no charge and a zero potential

A) no charge and a zero potential

B) a positive charge and zero potential

B) a positive charge and zero potential

C) a negative charge and positive potential

C) a negative charge and positive potential

D) a negative charge and a negative potential

D) a negative charge and a negative potential

#6. In the diagram above, if each of the resistors can dissipate a maximum of 18W without becoming excessively heated, what is the maximum power the circuit can dissipate?

A) 27W

A) 27W

B) 18W

B) 18W

C) 9W

C) 9W

D) 5W

D) 5W

#7. An open pipe closed at one end produces its first fundamental note. If the velocity of sound in air is P and t the length of the pipe, the frequency of the note is

A) 2v/t

A) 2v/t

B) v/5t

B) v/5t

C) v/4t

C) v/4t

D) v/2t

D) v/2t

#8. On a fairly cool rainy day when the temperature is 20oC, the length of a steel railroad track is 20m. What will be its length on a hot a dry day when the temperature is 40oC? [coefficient of linear expansion of steel = 11 x 10-6K-1]

A) 20.013m

A) 20.013m

B) 20.009m

B) 20.009m

C) 20.004m

C) 20.004m

D) 20.002m

D) 20.002m

#9. If an object is placed between two parallel plane mirrors with their reflecting surfaces facing each other, how many images of the object will be formed?

A) Infinite

A) Infinite

B) Eight

B) Eight

C) Four

C) Four

D) Two

D) Two

#10. The phenomenon where by the water droplets in the atmosphere combines with dust particles in the air to reduce visibility is

A) cloud

A) cloud

B) mist

B) mist

C) hail

C) hail

D) fog

D) fog

#11. At what position will an object be placed in front of a concave mirror in order to obtain an image at infinity?

A) At the pole of the mirror

A) At the pole of the mirror

B) At the principal focus

B) At the principal focus

C) at the center of the curvature

C) at the center of the curvature

D) Between the principal focus and the center of curvature

D) Between the principal focus and the center of curvature

#12. A turning fork of frequency 340Hz is vibrated just above a cylindrical tube of height 1.2m. If water is slowly poured into the tube, at what maximum height will resonance occur. [speed of sound in air = 340ms-1]

A) 0.95m

A) 0.95m

B) 0.60m

B) 0.60m

C) 0.50m

C) 0.50m

D) 0.45m

D) 0.45m

#13. By what factor will the size of an object placed 10cm from a convex lens be increased if the image is seen on a screen placed 25cm from the lens?

A) 15.0

A) 15.0

B) 2.5

B) 2.5

C) 1.5

C) 1.5

D) 0.4

D) 0.4

#14. Thermal equilibrium between two object exist when

A) the temperature of both objects are equal

A) the temperature of both objects are equal

B) the quantity of heat of both objects is the same

B) the quantity of heat of both objects is the same

C) the heat capacities of both objects are the same

C) the heat capacities of both objects are the same

D) one object losses heat continuously to the other

D) one object losses heat continuously to the other

#15. If an object just begins to slide on a surface inclined at 30o to the horizontal,the coefficient of friction is

A) √3

A) √3

B) √3/2

B) √3/2

C) 1/√2

C) 1/√2

D) 1/√3

D) 1/√3

#16. Water does not drop through an open umbrella of silk materials unless the inside of the umbrella is touched. This is due to

A) capilarity

A) capilarity

B) osmotic pressure

B) osmotic pressure

C) viscosity

C) viscosity

D) surface tension

D) surface tension

#17. The stylus of a phonograph record exerts a force of 7.7 x 10-2N on a groove of radius 10-5m. Compute the pressure exerted by the stylus on the groove

A) 2.45 x 108 Nm-2

A) 2.45 x 108 Nm-2

B) 3.45 x 108 Nm-2

B) 3.45 x 108 Nm-2

C) 4.90 x 108 Nm-2

C) 4.90 x 108 Nm-2

D) 2.42 x 108 Nm-2

D) 2.42 x 108 Nm-2

#18. A piece of stone attached to one end of a string is whirled round in a horizontal circle and the string suddenly cuts. The stone will fly off in a direction

A) perpendicular to the circular path

A) perpendicular to the circular path

B) parallel to the circular path

B) parallel to the circular path

C) tangential to the circular path

C) tangential to the circular path

D) towards the center of the circle

D) towards the center of the circle

#19. A 90cm uniform lever has a load of 30N suspended at 15cm from one of its ends. If the fulcrum is at the center of gravity, the force that must be applied at its other end to keep it in horizontal equilibrium is

A) 15N

A) 15N

B) 20N

B) 20N

C) 30N

C) 30N

D) 60N

D) 60N

#20. On top of a spiral spring of the force constant 500Nm-1 is placed a mass of 5 x 10-3 kg. If the spring is compressed downwards by a length of 0.02m and then released, calculate the height to which the mass is projected

A ) 8 m

A ) 8 m

B) 4 m

B) 4 m

C) 2 m

C) 2 m

D) 1 m

D) 1 m

#21. A test tube of radius 1.0cm is loaded to 8.8g. If is placed upright in water, find the depth to which it would sink

A) 2.8cm

A) 2.8cm

B) 5.2cm

B) 5.2cm

C) 25.5cm

C) 25.5cm

D) 28.0cm

D) 28.0cm

#22. The length of piece of glass block was measured by means of a vernier calliper as shown above. The length of the glass block is

A) 1.63 cm

A) 1.63 cm

B) 1.64 cm

B) 1.64 cm

C) 1.65 cm

C) 1.65 cm

D) 1. 66 cm

D) 1. 66 cm

#23. A hose of cross-sectional area 0.5m2 is used to discharge water from a water tanker at a velocity of 60ms-1 in 20s into a container. If the container is filled completely, the volume of the container is

A) 240m3

A) 240m3

B) 600m 3

B) 600m 3

C) 2400m 3

C) 2400m 3

D) 6000m3

D) 6000m3

#24. The tendency for a stationary body to continue to remain at rest when a force is applied to it is known as

A) friction

A) friction

B) impulse

B) impulse

C) inertia

C) inertia

D) momentum

D) momentum

#25. Which of the following statements correctly defines a simple machine? A device

A) that can produce electric current

A) that can produce electric current

B) which can only carry people from one place to another

B) which can only carry people from one place to another

C) with which work can be done easily

C) with which work can be done easily

D) which changes the state of rest or of uniform motion of an object

D) which changes the state of rest or of uniform motion of an object

#26. Which of the following factors does not affect the electric resistance of wire?

A) length

A) length

B) mass

B) mass

C) temperature

C) temperature

D) cross-sectional area

D) cross-sectional area

#27. A positively charged glass rod is placed near the cap of a positively charged electroscope. The divergence of the leaf is observed to

A) decrease

A) decrease

B) increase

B) increase

C) remain the same

C) remain the same

D) increase and collapse immediately

D) increase and collapse immediately

#28. Nuclear fission is preffered to nuclear fusion in the generation of energy because

A) very high temperature are required for fusion

A) very high temperature are required for fusion

B) the raw materials for fusion are easily obtained

B) the raw materials for fusion are easily obtained

C) energy obtained from fusion is relatively small

C) energy obtained from fusion is relatively small

D) the by-products of fusion is very dangerous

D) the by-products of fusion is very dangerous

#29. he silvered surface in a vacuum flask reduces heat loos due to

A) conduction

A) conduction

B) convection

B) convection

C) radiation

C) radiation

D) evaporation

D) evaporation

#30. The bar magnet illustrated in the diagram above picks up an unmagnetised steel nail X. In turn, X picks up a similar nail Y and so on. The nail are said to be magnetised by

A) conduction

A) conduction

B) single touch

B) single touch

C) induction

C) induction

D) divided touch

D) divided touch

#31. Which of the following statements is not true of the isotopes of an element? They

A) are atoms of the same element

A) are atoms of the same element

B) have the same chemical properties

B) have the same chemical properties

C) have the same atomic number

C) have the same atomic number

D) have the same mass number

D) have the same mass number

#32. Which of the following statements is true of ultra violet radiations? It

A) supports the sensation of hearing

A) supports the sensation of hearing

B) does not cause the emission of electrons from metals

B) does not cause the emission of electrons from metals

C) is an electromagnetic wave

C) is an electromagnetic wave

D) is not capable of causing sun burns

D) is not capable of causing sun burns

#33. The minimum energy required to remove an electron from an atom is known as

A) excitation energy

A) excitation energy

B) ionization energy

B) ionization energy

C) binding energy

C) binding energy

D) photon energy

D) photon energy

#34. The maximum power dissipated by a 100 omega resistor in a circuit is 4W. Calculate the voltage across the resistor

A) 10V

A) 10V

B) 20V

B) 20V

C) 25V

C) 25V

D) 400V

D) 400V

#35. One difference between a reactance and a resistance in an alternating current circuit is

A) resistance is larger than reactance

A) resistance is larger than reactance

B) energy is not diaaipated in a reactance

B) energy is not diaaipated in a reactance

C) energy is stored in a resistance but not in a reactance

C) energy is stored in a resistance but not in a reactance

D) the current in a reactance is lower than in the resistance

D) the current in a reactance is lower than in the resistance

#36. The direction of induced current in a straight wire placed in magnetic field is determined by using

A) Fleming's right hand rule

A) Fleming's right hand rule

B) Maxwell's screw rule

B) Maxwell's screw rule

C) Faraday's law

C) Faraday's law

D) Lenz's law

D) Lenz's law

#37. Which of the following statements about an electromagnet is correct?

A) it is a temporary magnet

A) it is a temporary magnet

B) its strength depends on the current

B) its strength depends on the current

C) its stength depends on the number of turns in its coil

C) its stength depends on the number of turns in its coil

D) it has permanent poles

D) it has permanent poles

#38. Which of the following statement about force is correct ?

A) electrostatic, gravitational and magnetic forces are always attractive

A) electrostatic, gravitational and magnetic forces are always attractive

B) electric, gravitational and magnetic field obeys inverse square law

B) electric, gravitational and magnetic field obeys inverse square law

C) field lines are real but their corresponding field are imaginary

C) field lines are real but their corresponding field are imaginary

D) field lines and their corresponding fields are both real

D) field lines and their corresponding fields are both real

#39. Two identical cells each of e.m.f 2v and internal resistance 1.0 omega are connected in parallel. The combination is connected to an external load of 1.5 omega . Calculate the current in the circuit

A) 0.57A

A) 0.57A

B) 1.00A

B) 1.00A

C) 1.14A

C) 1.14A

D) 2.00A

D) 2.00A

#40. A current of 10A passes through a conductor for 10s, calculate the charge flowing through the conductor

A) 100.0C

A) 100.0C

B) 10.0C

B) 10.0C

C) 1.0C

C) 1.0C

D) 0.1C

D) 0.1C

#41. Which of the following statements about the human eye and the camera is correct?

A) both form virtual image of objects

A) both form virtual image of objects

B) the image formed by the eye is upright in the retina while that formed by the camera is inverted on the film

B) the image formed by the eye is upright in the retina while that formed by the camera is inverted on the film

C) the inside of both of them is blackened to absorb unwanted light

C) the inside of both of them is blackened to absorb unwanted light

D) the focal length of both eye lens and the camera lens can be varied

D) the focal length of both eye lens and the camera lens can be varied

#42. The speed of sound in air is is directly proportional to

A) its temperature on the celsius scale

A) its temperature on the celsius scale

B) ite temperature in the thermodynamic scale

B) ite temperature in the thermodynamic scale

C) the cube root of its temperature on its celcius scale

C) the cube root of its temperature on its celcius scale

D) the square roor of its temperature on the absolute scale

D) the square roor of its temperature on the absolute scale

#43. A sonometer wire of linear density 0.08kg m-1 subjected to a tension of 800N is plucked. Calculate the speed of a pulse which moves from one end of the wire to the other

A) 179.0ms-1

A) 179.0ms-1

B) 100.0ms-1

B) 100.0ms-1

C) 15.8ms-1

C) 15.8ms-1

D) 8.0ms-1

D) 8.0ms-1

#44. Which of the following instruments gives a pure note when sounded?

A) talking drum

A) talking drum

B) siren

B) siren

C) tunning fork

C) tunning fork

D) guitar

D) guitar

#45. Which of the following features of an electrostatic line of force is not correct?

A) it is an imaginary line which a positive charge will describe if it is free to move

A) it is an imaginary line which a positive charge will describe if it is free to move

B) the tangent drawn at any point on a curved line of force shows the direction of the electric field intensity at that point

B) the tangent drawn at any point on a curved line of force shows the direction of the electric field intensity at that point

C) it is sometimes curved

C) it is sometimes curved

D) it can cross another line of force in a region of intense electric field

D) it can cross another line of force in a region of intense electric field

#46. An object is placed on the principal axis and at the centre of curvature of a concave mirror, the image of the image formed by the mirror is

A) real and magnified

A) real and magnified

B) real and inverted

B) real and inverted

C) erect and magnified

C) erect and magnified

D) erect and virtual

D) erect and virtual

#47. A converging lens produces an image four times as large as an object placed 25cm from the lens. Calculate its focal length

A) 100cm

A) 100cm

B) 33cm

B) 33cm

C) 29cm

C) 29cm

D) 20cm

D) 20cm

#48. The horizontal floor of a water reservoir appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.35, calculate the real depth of the reservoir

A) 2.35m

A) 2.35m

B) 1.35m

B) 1.35m

C) 1.00m

C) 1.00m

D) 0.35m

D) 0.35m

#49. A converging lens has a focal length of 5cm. Determine its power

A) +20.0

A) +20.0

B) +0.2

B) +0.2

C) -20.00

C) -20.00

D) -0.2

D) -0.2

#50. Which of the following pairs of rays shows the widest separation in the spectrum of white light?

A) green and blue

A) green and blue

B) orange and indigo

B) orange and indigo

C) blue and violet

C) blue and violet

D) red and yellow

D) red and yellow

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