Physics Past Questions v34 for (JAMB/WAEC/NECO)

Physics Past Questions v34 For (JAMB/WAEC/NECO); These Physics past questions are for students who are sitting for the following examinations

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WAEC GCE
NECO GCE
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NABTEB GCE

Physics Past Questions v34 For (JAMB/WAEC/NECO)

Results

#1. Satellite communication network makes use of?

A) visible light

B) sound wave

C) radio wave

D) infra-red wave

#2. An electric device is rated 2000 W, 250 v. The correct fuse rating of the device is?

A) 9 A

B) 8 A

C) 6 A

D) 7 A

#3. The north pole of a magnet can never be separated from the south pole because of the property knowledge as?

A) magnetic octopole

B) magnetic monopole

C) magnetic dipole

D) magnetic quadrupole

#4. A car battery rated 45 A H is charged with a charger whose rating is 2.5A.How long will it take to charge the battery full?

A) 10 hrs

B) 18 hrs

C) 20 hrs

D) 25 hrs

#5. The electric field intensity in a place where a charge of 10-10c experiences a force of 0.4N is?

A) 4.0 x 107 NC-1

B) 8.0 x 109 NC-1

C) 8.O x 10-12 NC-1

D) 4.0 x 109 NC-1

#6. The process whereby the molecules of different substances move randomly is called?

A) capillarity

B) surface tension

C) osmosis

D) diffusion

#7. I. reproducibility II. SensibilityIII. High terminal capacityiv. High accuracy The quantities of a good thermometer include?

A) I, II and IV only

B) I, III and IV only

C) I, II and III only

D) II, III and IV only

#8. The process whereby a liquid turns spontaneously into vapour is called?

A) regelation

B) sublimation

C) boiling

D) evaporation

#9. I. MeltingII. Boiling III. RefractionIV. ConductionWhich combination of the above is evident of the molecular nature of matter?

A) II , III and IV only

B) I ,II and IV only

C) I , III and IV only

D) I , II and III only

#10. When very hot water is poured into two identical thin and thick glass tumblers in equal volumes, the thick one cracks because?

A) of the even expansion of glass

B) glass is a crystal

C) glass is a good conductor of heat

D) of the uneven expansion of glass

#11. The current in a reverse-biased junction is due to?

A) minority carriers

B) electrons

C) majority carriers

D) holes

#12. which of the following materials is a conductor?

A) Glass

B) Wax

C) Sodium

D) Plastic

#13. When the temperature difference between the wet and dry bulbs of a hygrometer is high, this indicates that

A) it is about to rain

B) the relative humidity is high

C) there is plenty of sunshine

D) the relative humidity is low

#14. A 3m3 volume of liquid W of density 200kgm3 is mixed with another liquid L of volume 7m3 and density 150kgm-3. the density of mixture is?

A) 165kgm-3

B) 100kgm-3

C) 265kgm-3

D) 350kgm-3

#15. A body of mass 36kg falls through a viscous liquid which offers a drag force of 260N on the body. The upthrust on the body at terminal velocity is? [g = 10ms2]

A) 100N

B) 620N

C) 50N

D) 310N

#16. A silicon material is dopped with an element of a certain group and an n-type semi-conductor is formed. the most likely group of the element is

A) V

B) III

C) I

D) II

#17. The charge carriers in gasses are

A) ions only

B) electrons and ions

C) electrons and holes

D) electrons only

#18. the ray which causes gas molecules to glow is known as

A) cathode ray

B) anode ray

C) molecular ray

D) gamma ray

#19. A transformer is rated 240v. If the primary coil is 4000 turns and the secondary voltage 12v, determine the number of turns in the secondary coil.

A) 200

B) 100

C) 250

D) 150

#20. An object is projected for the hieght of 80 m above the ground with a velocity of 40ms-1 at the angle of 30° to the horizontal. The time of flight

A) 8 s

B) 4 s

C) 16 s

D) 10 s

#21. In an a.c circuit that contains only a capacitor, the voltage lags behind the current by

A) 180°

B) 90°

C) 60°

D) 30°

#22. The time it will take a certain radioactive material with a half-life of 50 days to reduce to 1/32of its original number is

A) 250days

B) 150days

C) 300days

D) 200days

#23. a proton moving with a speed of 1.0 x 106ms-1 through a magnetic field of 1.0T experiences a magnetic force of magnitude 8.0 x 10-14 N. The angle between the proton''s velocity and the field is

A) 60°

B) 90°

C) 30°

D) 45°

#24. When impurities are added to semi-conductors, the conductivity of the semi-conductor

A) increases then decreases

B) increases

C) decreases

D) remains constant

#25. The sharpness of the boundary of the shadow of an object is determined by the

A) intensity of light striking the object

B) rays of light passing through the object

C) nature of the object

D) opacity of the object

#26. A thin converging lens has a power of 4.0 diopters determined its focal length.

A) 2.50m

B) 0.03m

C) 5.00m

D) 0.25m

#27. A real image three times the size of an object is formed 24cm from a converging mirror. what is the focal length of the mirror.

A) 16cm

B) 6cm

C) 8cm

D) 12cm

#28. The pair of physical quantities consisting of vectors only are

A) momentum and power

B) velocity and distance

C) displacement and torgue

D) accelaration and speed

#29. Marching soldiers crossing a suspension bridge are usually advised to break their steps to avoid damaging the bridge owing to

A) oscillation

B) resonance

C) swinging

D) vibration

#30. In a nuclear reactor, chain reactions result from the release of

A) electrons

B) photons

C) neutrons

D) protons

#31. Which of the following source of energy is renewable?

A) petroleum

B) charcoal

C) hydro

D) nuclear

#32. Light of energy 5.0 eV falls on a metal of work function 3.0 eV and electrons are emitted, determine the stopping potential. [electronic charge, e = 1.60 x 108ms-19]

A) 1.7V

B) 2.0V

C) 8.0V

D) 15.0V

#33. Uranium of atom number 92 and mass number 238 emits an alpha particle from its nucleus. The new nucleus formed has respectively, atomic number and mass number

A) 94 and 238

B) 90 and 236

C) 88 and 234

D) 90 and 234

#34. A bar magnet is placed near and lying along the axis of a solenoid connected to a galvanometer. The pointer of the galvanometer shows no deflection when

A) the magnet is moved away from the stationary solenoid

B) the solenoid is moved away from the stationary magnet

C) the magnet is moved towards the stationary solenoid

D) there is no relative motion between the magnet and the solenoid

#35. an electric motor is a machine that converts

A) mechanical energy into electrical energy

B) electrical energy into mechanical energy

C) high voltage to low voltage

D) low voltage to high voltage

#36. Which of the following statements is an advantage of nuclear fusion over nuclear fission?

A) The resulting chain reaction which produces large amount of energy

B) no radioactve wave is produced as bye product

C) very high temperature is required in the process

D) the end product is lead

#37. Which of the following statements is not a reason for using soft iron in making the core of a transformer? It

A) retains its magnetism for a long time

B) is easily magnitised

C) reduces energy loss due to hysteresis

D) is easily demagnetised

#38. An electric lamp is rated 240V, 40W. What is the cost of running the lamp for 72 hours if the electricity authority charges N2.50 per kWh?

A) N7.20

B) N18.00

C) 180.00

D) N720.00

#39. Which of the following statements explains lost volt in an electric circuit?

A) total p.d from a source to maintain a flow of current through the circuit as well as the source

B) p.d to drive current through the circuit component except the source

C) p.d across all external components connected to the source of electricity

D) p.d across the internal resistance of the cell

#40. A constantan wire has a cross sectional area of 4 x 10-8m2 and a resistivity of 1.1 x 10-6m omega. If a resistor of resistance 11 omega is to be made from this wire, calculate the length of the wire required

A) 0.4m

B) 0.8m

C) 2.5m

D) 5.0m

#41. The mass and weight of a body on earth are 8kg and 80N respectively. Determine the mass and weight of the body respectively on a planet where the pull of gravity is 1/8 that on earth

A) 8kg, 8N

B) 1kg, 10N

C) 64kg, 10N

D) 8kg, 10N

#42. The ability of a material to store an electric charge when its plates are at different potentials is referred to as its

A) conductance

B) inductance

C) capacitance

D) resistance

#43. a chemical cell of internal resistance 1 omega supplies electric current to an external resistor of resistance 3 omega. Calculate the efficiency of the cell

A) 75%

B) 50%

C) 33%

D) 25%

#44. Radio waves travel in air at 3.0 x 108ms-1. If the waves enter water of refractive index 4/3 , calculate the speed of radio waves in water

A) 4.33 x 108ms-1

B) 4.00 x 108ms-1

C) 2.25 x 108ms-1

D) 1.33 x 108ms-1

#45. Which of the following optical instruments does not depend on the use of plane mirrors?

A) kaleidoscope

B) simple microscope

C) sextant

D) simple periscope

#46. A ray of light is incident normally on a plan mirror. If the incident ray is kept fixed while the mirror is rotated through an angle of 30o, determine the initial and final angles of reflection respectively

A) 0o and 60o

B) 90o and 30o

C) 0o and 30o

D) 90o and 60o

#47. In which of the following media is the transmission of sound wave fastest?

A) Vacuum

B) Air

C) Wood

D) Iron

#48. Which of the following statements about boiling and evaporation at atmospheric pressure is correct?

A) evaporation and boiling of water take place at 100o

B) evaporation of water takes place at a temperature greater than 100oC, while boiling takes place at 100oC

C) evaporation of water takes place at 100oC while boiling takes place at a higher temperature

D) boiling takes place at 100o while evaporation my take place at temperatures lower than 100oC

#49. Which of the following statements is correct?

A) the density of a liquid decreases when it expands

B) the density of a liquid increases when the liquids are heated

C) the real expansivity of a liquid is less than its apparent expansivity

D) a liquid changes to solid when heated to a sufficiently high temperature

#50. The pressure exerted by a given mass of gas in a container

A) decreases if the container is heated

B) increases if the molecules of the gas move faster

C) increases if the container is doubled

D) decreases as the kinetic energy of the gas molecules inceases

#51. Which of the following statements about a progressive mechanical wave is correct?

A) it can be a plane polarised

B) its energy is localised at specific points of its profile

C) it does not require a material medium for its propagation

D) its frequency remains constant as it travels between different media

#52. The distance between two points in phase on a progressive wave is 5cm. If the sped of the wave is 0.2ms-1, calculate its period

A) 4.00s

B) 2.50s

C) 0.25s

D) 0.04s

#53. The lower and upper fixed point of a thermometer are 30mm and 180mm respectively. Calculate the temperature in degrees Celsius when the thermometer reads 45mm

A) 10.0oC

B) 15.0oC

C) 20.0oC

D) 30.0oC

#54. An immersion heater rated 400W, 220V is used to heat a liquid of mass 0.5kg. If the temperature of the liquid increases uniformly at the rate of 2.5oC per second, calculate the specific heat capacity of the liquid. [Assume no heat is lost]

A) 1100Jkg-1K-1

B) 320Jkg-1K-1

C) 200Jkg-1K-1

D) 176Jkg-1K-1

#55. Water falls through a height of 50m. Determine the temperature rise at the bottom of the fall. [Neglect energy losses. Specific heat capacity of water = 4200Jkg-1 K-1, g = 10ms2]

A) 0.119oC

B) 0.840oC

C) 1.190oC

D) 8.400oC

#56. The energy required to change a solid to liquid at constant temperature is called

A) thermal capacity

B) has lower specific heat capacity

C) latent heat of fusion

D) latent heat of vaporisation

#57. Which of the following about an object performing simple harmonic motion is correct? Its acceleration

A) is maximum at the extreme ends

B) is constant and directed towards a fixed point

C) is zero when it is displayed from the equilibrum position

D) varies linearly with the displacement from a fixed point and is directed towards the fixed point

#58. A body of mass 5kg moving with a velocity of 10ms-1 collides with a stationary body of mass 6kg. If the two bodies stick together and move in the same direction after their collision, calculate their common velocity

A) 4.55ms-1

B) 12.00ms-1

C) 30.00ms-1

D) 50.00ms-1

#59. Fuel was consumed at a steady rate of 5.0 x 10-2kg per second in a rocket engine and ejected as a gas with a speed of 4 x 103ms-1. Determine the thrust on the rocket

A) 20N

B) 80N

C) 200N

D) 800N

#60. Which of the following quantities has the same unit as energy?

A) power

B) work

C) force

D) momentum

#61. A wheel and axle of radii 800mm and 200mm respectively is used to raise a body of weight 800N by the application of 250N. Calculate the efficiency of the machine

A) 85%

B) 80%

C) 60%

D) 20%

#62. Masses,m1 and m2 at the 20-cm and 65-cm marks respectively of a uniform metre rule freely suspended at its centre of gravity. If the metre rule balances horizontally, determine the ratio m2 : m1

A) 2 : 1

B) 3 : 3

C) 2 : 3

D) 1 : 2

#63. Which of the following type of motion does a body undergo when acted upon by a couple?V

A) vibrational

B) translational

C) rotational

D) random

#64. The frequency of a swinging pendulum is the

A) number of complete oscillations the pendulum makes in a second

B) number of amplitudes the bob makes in a second

C) angle the bob swings through in a second

D) distance the bob covers in a second

#65. Each of the following physical quantities is classified as a vector or a scalar quantity. Which of the classifications is correct?

A) electric potential (Vector)

B) momentum (scalar)

C) gravitational field intensity (scalar)

D) magnetic flux density (vector)

#66. Which of the following statements about a spring balance and/or a chemical balance is not correct?

A) the chemical balance operates on the principle of moments

B) the sprin balance operates on Hooke's law

C) either may be used to measure the weight of a substance

D) the reading of a spring balance changes over the surface of the earth, while that of the chemical balance remaind constant

#67. The friction which exists between two layers of liquid in relative motion is called

A) capillarity

B) surface tension

C) viscosity

D) cohension

#68. A body of mass 25kg, moving at 3ms-1 on a rough horizontal floor is at rest after sliding through a distance of 2.50m on the floor. Calculate the co-efficient of sliding friction. [g = 10.0ms-2]

A) 0.09

B) 0.18

C) 0.36

D) 0.54

#69. Which of the following simple machines is a second class lever?

A) wheel barrow

B) crowbar

C) claw hammer

D) seesae

#70. Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules?

A) Translational motion

B) rotational motion

C) brownian motion

D) oscillatory motion

#71. The diagram above shows the resultant electric field pattern due to two electric point charges P and S. Which of the following statements is correct?

A) P is negatively charged while S is positively charged

B) P is positively charged while S is negatively charged

C) both P and S are positively charged

D) both P and S are negatively charged

#72. The amplitude of a wave is the

A) distance between two successive troughs of the wave

B) separation of two adjacent particles vibrating in phase

C) maximum displacement of the wave particle from the equilibrium position

D) distance travelled by a wave in a complete cycle of its motion

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

A) e.m.f. 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

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

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

E) the induced charge is constant for a fixed change of flux.

#74. I. Melting II. Boiling III. Refraction IV. Conduction Which combination of the above is evident of the molecular nature of matter?