Physics Past Questions v47 for (JAMB/WAEC/NECO)

Physics Past Questions v47 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 v47 For (JAMB/WAEC/NECO)

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#1. A piece of radioactive material contains 1000 atmos. If its half -life is 20seconds, the time taken for 125 atoms to remain is

A) 20 seconds

A) 20 seconds

B) 40 seconds

B) 40 seconds

C) 80 seconds

C) 80 seconds

D) 60 seconds

D) 60 seconds

#2. The p-n junction diodes can act as rectifiers because they

A) conduct current when forward-biased

A) conduct current when forward-biased

B) conduct current when reverse-biased

B) conduct current when reverse-biased

C) block current when forward-biased

C) block current when forward-biased

D) conduct current in both directions

D) conduct current in both directions

#3. If a reverse-biased voltage is applied across a p-n junction, the depletion layer width is

A) increased

A) increased

B) decreased

B) decreased

C) constant

C) constant

D) halved

D) halved

#4. I. Small size. II. Low power requirement III. Not easily damaged by high temperature IV. Highly durable. Which of the above are the advantages of semiconductors?

A) I,II and lll only

A) I,II and lll only

B) ll,lll and lV only

B) ll,lll and lV only

C) l, Hand lV only

C) l, Hand lV only

D) l, ll, lll and lV

D) l, ll, lll and lV

#5. A particle carrying a charge of 1. 0 x 10-8C enters a magnetic field at 3.0x 10-2 ms -1 at right angles to the field. If the force on this particle is 1.8 x 10-8N, what is the magnitude of the field?

A) 6.0x10-1T

A) 6.0x10-1T

B) 6.0x10T

B) 6.0x10T

C) 6.0x10-3T

C) 6.0x10-3T

D) 6.0x10-4T

D) 6.0x10-4T

#6. The current output from of an a.c. source is given as I = 10 sin to t. The d.c equivalent of the current is

A) 5.0A

A) 5.0A

B) 7.1A

B) 7.1A

C) 10.0A

C) 10.0A

D) 14.1A

D) 14.1A

#7. A conductor of length 1m moves with a velocity of 50ms-1 at an angle of 30o to the direction of a uniform magnetic field of flux density 1.5Wbm-2. What is the e.m.f induced in the conductor?

A) 37.5V

A) 37.5V

B) 50.5V

B) 50.5V

C) 75.0V

C) 75.0V

D) 80.5V

D) 80.5V

#8. he process of detecting a pin mistakenly swallowed by a child is X-ray

A) Diagnosis

A) Diagnosis

B) Therapy

B) Therapy

C) Crystallography

C) Crystallography

D) Mammography

D) Mammography

#9. Which of the following particies CANNOT be deflected by both electric and magnetic fields?

A) Gamma rays

A) Gamma rays

B) Alpha particles

B) Alpha particles

C) Wave particles

C) Wave particles

D) Beta particles

D) Beta particles

#10. I. Rays of light travel from a less dense medium to a denser medium. II. The Angle of incidence is greater than critical angle. III. Rays of light travel from a denser medium to a less dense medium. Which of the statements above are conditions for total internal reflection to occur?

A) I & II only

A) I & II only

B) I & III only

B) I & III only

C) II & III only

C) II & III only

D) II only

D) II only

#11. The use of lenses is Not applicable in the

A) projector

A) projector

B) human eye

B) human eye

C) periscope

C) periscope

D) telescope

D) telescope

#12. Disperson of white light is the ability of white light to

A) penetrate air, water and glass

A) penetrate air, water and glass

B) move in a straight line

B) move in a straight line

C) move around corners

C) move around corners

D) separate to its component colours

D) separate to its component colours

#13. A newly charged 12V accumulator can easily start a car whereas eight new dry cells in series with a effective e.m.f. of 12V cannot start the same car because

A) The current capacity is high

A) The current capacity is high

B) The current capacity is low

B) The current capacity is low

C) it cannot be re-charged

C) it cannot be re-charged

D) it cannot easily be connected to a car

D) it cannot easily be connected to a car

#14. The fuse in an electric device is always connected to the

A) neutral side of an electric supply

A) neutral side of an electric supply

B) earth side of an electric supply

B) earth side of an electric supply

C) live side of an electric supply

C) live side of an electric supply

D) terminal side of an electric supply

D) terminal side of an electric supply

#15. Where can a man place his face to get an enlarged image when using a concave mirror to shave?

A) Between the centre of curvature and the principal focus

A) Between the centre of curvature and the principal focus

B) At the principal focus

B) At the principal focus

C) Between the principal focus and the pole

C) Between the principal focus and the pole

D) At the centre of curvature

D) At the centre of curvature

#16. A pinhole camera is placed 300m in front of a building so that the image is formed on a screen 5cm from the the pinhole. If the image is 2.5cm high, the height of the building will be

A) 25m

A) 25m

B) 50m

B) 50m

C) 100m

C) 100m

D) 150m

D) 150m

#17. The magnification of an object 2cm tall when placed 10cm in front of a plane mirror is

A) 6.0

A) 6.0

B) 1.0

B) 1.0

C) 0.7

C) 0.7

D) 0.6

D) 0.6

#18. After reflection from the concave mirror, rays of light from the sun converges

A) at the radius of curvature

A) at the radius of curvature

B) at the focus

B) at the focus

C) beyond the radius of curvature

C) beyond the radius of curvature

D) between the focus and radius of curvature

D) between the focus and radius of curvature

#19. A glass block of thickness 10cm is placed on an object. If an observer views the object vertically, the displacement of the object is

A) 3.33cm

A) 3.33cm

B) 5.00cm

B) 5.00cm

C) 6.67cm

C) 6.67cm

D) 8.50cm

D) 8.50cm

#20. The quantity of heat energy required to melt completely 1 kg of ice at - 30oC is [latent heat of fusion = 3.5 x 10 5Jkg -1, specific heat capacity of ice = 2.1x10 3Jkg -1K -1]

A) 4.13x10 6J

A) 4.13x10 6J

B) 4.13x10 5J

B) 4.13x10 5J

C) 3.56x10 4J

C) 3.56x10 4J

D) 3.56x10 2J

D) 3.56x10 2J

#21. I. It is a rapid, constant and irregular motion of tiny particles. II. It gives evidence that tiny particles of matter called molecules exist. III. It takes place only in gases. IV. It gives evidence that molecules are in a constant state of random motion. which of the combinations above is correct about Brownian notion?

A) I,II and III only

A) I,II and III only

B) II,III and IV only

B) II,III and IV only

C) I,III and lV only

C) I,III and lV only

D) l, ll and lV only

D) l, ll and lV only

#22. The equation of a wave traveling in a horizontal direction is expressed as y = 15 sin 2/5 (60t - x) what is its wave length?

A) 60m

A) 60m

B) 15m

B) 15m

C) 5m

C) 5m

D) 2m

D) 2m

#23. Which of the following factors will affect the velocity of sound?

A) An increase in the pitch of the sound

A) An increase in the pitch of the sound

B) An increase in the loudness of the sound

B) An increase in the loudness of the sound

C) Wind travelling in the same direction of the sound

C) Wind travelling in the same direction of the sound

D) A change in the atmospheric pressure at constant temperature

D) A change in the atmospheric pressure at constant temperature

#24. The characteristic of a vibration that determines its intensity is the

A) Frequency

A) Frequency

B) Overtone

B) Overtone

C) Wavelength

C) Wavelength

D) Amplitude

D) Amplitude

#25. Clinical thermometers are examples of

A) pressure gas thermometer

A) pressure gas thermometer

B) resistance thermometer

B) resistance thermometer

C) alcohol thermometer

C) alcohol thermometer

D) mercury- in - glass thermometer

D) mercury- in - glass thermometer

#26. 2000cm3 of a gas is collected at 27oC and 700mmHg. What is the volume of the gas at standard temperature and pressure?

A) 1896.5cm3

A) 1896.5cm3

B) 1767.3cm3

B) 1767.3cm3

C) 1676.3cm3

C) 1676.3cm3

D) 1456.5cm3

D) 1456.5cm3

#27. Calculate the temperature change when 500J of heat is supplied to 100g of water

A) 12.1oC

A) 12.1oC

B) 2.1oC

B) 2.1oC

C) 1.2oC

C) 1.2oC

D) 0.1oC

D) 0.1oC

#28. Which of the following is NOT a factor that can increase the rate of evaporation of water in a lake?

A) increase in the pressure of the atmosphere

A) increase in the pressure of the atmosphere

B) rise in temperature

B) rise in temperature

C) increase in the average speed of the molecules of water ecules of water

C) increase in the average speed of the molecules of water ecules of water

D) increase in the kinetic energy of the mol

D) increase in the kinetic energy of the mol

#29. A block and tackle is used to raise a load of 250N through a vertical distance of 30m. What is the efficiency of the system if the work done against friction is 1500J?

A) 62.5%

A) 62.5%

B) 73.3%

B) 73.3%

C) 83.3%

C) 83.3%

D) 94.3%

D) 94.3%

#30. If a load of 1 kg stretches a cord by 1.2cm, what is the force constant of the cord? {g=10ms-2}

A) 866Nm-1

A) 866Nm-1

B) 833Nm-1

B) 833Nm-1

C) 769Nm-1

C) 769Nm-1

D) 667Nm-1

D) 667Nm-1

#31. An object of volume 1 m 3 and mass 2kg is totally immersed in a liquid of density 1 kgm-3 . Calculate its apparent weight.

A) 20N

A) 20N

B) 10N

B) 10N

C) 2N

C) 2N

D) 1 N

D) 1 N

#32. The pressure at any point in a liquid at rest depends only on the

A) depth and the density

A) depth and the density

B) mass and the volume

B) mass and the volume

C) quantity and the surface area

C) quantity and the surface area

D) surface area and the viscosity

D) surface area and the viscosity

#33. A balloon whose volume is 300m3 is filled with hydrogen. If the density of air is 1.3 kgm-3, find the upthrust on the balloon. [g = 10ms-2]

A) 3000N

A) 3000N

B) 3800N

B) 3800N

C) 3900N

C) 3900N

D) 4200N

D) 4200N

#34. A car starts from rest and moves with a uniform acceleration of 30ms-2 for 20s. Calculate the distance covered at the end of the motion

A) 6km

A) 6km

B) 12km

B) 12km

C) 18km

C) 18km

D) 24km

D) 24km

#35. A rocket is fired from the earth's surface to a distant planet. By Newton's law of universal gravitation, the force F will

A) increase as r reduces

A) increase as r reduces

B) increase as G varies

B) increase as G varies

C) remains constant

C) remains constant

D) increases as r increases

D) increases as r increases

#36. If a freely suspended object is pulled to one side and released, it oscillates about the point of suspension because the

A) acceleration is directly proportional to the displacement

A) acceleration is directly proportional to the displacement

B) motion is directed away from the equilibrium point

B) motion is directed away from the equilibrium point

C) acceleration is directly proportional to the square of the displacement

C) acceleration is directly proportional to the square of the displacement

D) velocity is minimum at the equilibrium point

D) velocity is minimum at the equilibrium point

#37. An object moves in a circular path of radius 0.5m with a speed of 1ms-1 What is its angular velocity?

A) 8 rads-1

A) 8 rads-1

B) 4 rads-1

B) 4 rads-1

C) 2 rads-1

C) 2 rads-1

D) 1 rads-1

D) 1 rads-1

#38. An object of mass 20kg slides down an inclined plane at an angle of 30o to the horizontal. The coefficient of static friction is? [g = 10ms-2]

A) 0.2

A) 0.2

B) 0.3

B) 0.3

C) 0.5

C) 0.5

D) 0.6

D) 0.6

#39. In order to remove the error of parallax when talking measurements with a metre rule, the eye should be focused

A) slantingly towards the right on the markings

A) slantingly towards the right on the markings

B) slantingly towards the left on the markings

B) slantingly towards the left on the markings

C) vertically downwards on the markings

C) vertically downwards on the markings

D) vertically upwards on the markings

D) vertically upwards on the markings

#40. A load is pulled at a uniform speed along a horizontal floor by a rope at 45o to floor. If the force in the rope is 1500N, what is the frictional force on the load ?

A) 1524N

A) 1524N

B) 1350N

B) 1350N

C) 1260N

C) 1260N

D) 1061N

D) 1061N

#41. Calculate the total distance covered by a train before coming to rest if its initial speed is 30ms-1 with a constant retardation of 0.1m-2

A) 5500m

A) 5500m

B) 4500m

B) 4500m

C) 4200m

C) 4200m

D) 3000m

D) 3000m

#42. An object is placed 20cm from a concave mirror of focal length 15cm. Calculate the linear magnification of the image formed

A) 0.5

A) 0.5

B) 1.5

B) 1.5

C) 2.0

C) 2.0

D) 3.0

D) 3.0

#43. An atom in an excited state is one whose

A) potential energy is minimum

A) potential energy is minimum

B) potential energy is maximum

B) potential energy is maximum

C) electron are in the conduction band

C) electron are in the conduction band

D) electron have moved to higher energy level

D) electron have moved to higher energy level

#44. A metal with a work function of 3.0ev is irradiated with ultraviolet light of energy 4.0 ev. The kinetic energy of the ejected electron is

A) 1.0eV

A) 1.0eV

B) 3.0eV

B) 3.0eV

C) 4.0eV

C) 4.0eV

D) 7.0eV

D) 7.0eV

#45. Which of the following statements about X-rays is correct? X-rays

A) are produced when a metal surface is irradiated with ultraviolet light

A) are produced when a metal surface is irradiated with ultraviolet light

B) are produced when a metal target is used to block fast miving electrons

B) are produced when a metal target is used to block fast miving electrons

C) have long wavelengths and are therefoer very penetrating

C) have long wavelengths and are therefoer very penetrating

D) are not part of the electromagnetic spectrum

D) are not part of the electromagnetic spectrum

#46. Which of the following radiations emitted in radioactive decay has momentum, a fairly high penetrating power and is deflected by a magnet?

A) alpha particles

A) alpha particles

B) beta particle

B) beta particle

C) gamma radiation `

C) gamma radiation `

D) X-radiation

D) X-radiation

#47. The magnetic relay is a device used for

A) timing in sports

A) timing in sports

B) storing magnetic field

B) storing magnetic field

C) readin the magnitude of magnetic flux

C) readin the magnitude of magnetic flux

D) controlling another circuit carrying larger current

D) controlling another circuit carrying larger current

#48. the core of a transformer is usually laminated in order to

A) reduce magnetic leakage

A) reduce magnetic leakage

B) reduce eddy current

B) reduce eddy current

C) prevent vibration of the transformer

C) prevent vibration of the transformer

D) make magnetic reversal in the core much easier

D) make magnetic reversal in the core much easier

#49. Which of the following modes is the most economical method of transmitting electrical power over long distances?

A) alternating current at low voltage and high current

A) alternating current at low voltage and high current

B) alternating current at high voltage and high current

B) alternating current at high voltage and high current

C) alternating current at high voltage and low current

C) alternating current at high voltage and low current

D) direct current at low voltage and high current

D) direct current at low voltage and high current

#50. In a R-C circuit

A) Irms leads Vrms by 60o

A) Irms leads Vrms by 60o

B) Irms slags Vrms by 60o

B) Irms slags Vrms by 60o

C) Vrms lags Irms by 90o

C) Vrms lags Irms by 90o

D) Vrms leads Irms by 90o

D) Vrms leads Irms by 90o

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