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Physics Past Questions v28 for (JAMB/WAEC/NECO)

Physics Past Questions v28 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 v28 For (JAMB/WAEC/NECO)

Results

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#1. J.J. Thomson’s model of the atom was abandoned because

A) it could not explain the scattering of alpha particles

B) it did not account for the neutron

C) it did not account for the size of the atom

D) it was known as plum-pudding model

E) the model was not similar to any observable phenomena

#2. Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain

A) pressure is increased

B) pressure is reduced

C) the rays of the sun add more heat to the water

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

E) the temperature is lower than at sea-level

#3. The volume of a given mass of gas is 40cm3 at 27° C. What is its volume at 90° C if its pressure remains constant?

A) 32.84cm3

B) 40.02cm3

C) 48.40cm3

D) 57.44cm3

E) 72.84cm3

#4. Which of the following statements is NOT true?

A) A lead-acid accumulator can deliver a large current because of its very large internal resistance.

B) A secondary cell can be recharged.

C) As a lead-acid accumulator is being charged, the density of the acid in it increases.

D) The chemical action in a primary cell is irreversible.

E) The conventional current in a circuit rlows from the positive to the negative terminal of the battery.

#5. A sheet of white paper viewed through blue glass appears blue because

A) blue is a primary colour

B) the glass absorbs all colours except the blue colour

C) the glass reflects blue colour

D) the paper reflects blue colour only

E) white light is easily absorbed by the glass

#6. An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.

A) 90cm

B) 40cm

C) 30cm

D) 20cm

E) 10cm

#7. Which of the following properties is NOT exhibited by sound waves? A) Diffraction B) interference C) Polarisation D) Reflection E) Refraction

A) Diffraction

B) interference

C) Polarisation

D) Reflection

E) Refraction

#8. An evidence of the wave nature of matter is

A) Browniam motion

B) Compton effect

C) diffraction

D) diffusion

E) photo electricity

#9. The area under the curve of a velocity time graph represents

A) acceleration

B) distance covered

C) instantaneous speed

D) time taken

E) work done

#10. Which of the following statements about the concept of solid friction is NOT true?

A) It always acts in the direction of motion

B) It causes wear and tear in car tyres

C) It depends on the natheure of t surfaces in contact

D) It is independent of the area of the surfaces in contact.

E) It reduces the efficiency of the machine

#11. The space surrounding a magnet in which the magnetic force is exerted is

A) magnetic field

B) magnetic flux

C) magnetic point

D) magnetic pole

E) magnetic strength

#12. Calculate the critical angle for light travelling from water to air. (Refractive index of water = 1.33)

A) 36.9°

B) 41.3°

C) 48.8°

D) 49.2°

E) 51.4

#13. A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the

A) charges generated by friction in the tanker are conducted to the earth

B) chain vibrates in resonance with the tanker’s engine

C) heat generated by friction in the engine is conducted to the earth

D) petrol tanker is balanced on the road

E) tanker does not exceed a certain speed limit

#14. A transformer is required to give 120V from a 240V mains supply. If the primary has 5500 turns, how many turns has the secondary?

A) 232

B) 450

C) 550

D) 2750

E) 11000

#15. A constant force of 5N acts for 5s on a mass of 5kg initially at rest. Calculate the final momentum of the mass.

A) 125 kgms-1

B) 75 kgms-1

C) 25 kgms-1

D) 20 kgms-1

E) 5 kgms-1

#16. A stone is released from a height of 80m above the ground. Calculate its velocity just before it strikes the ground. (g=10ms-2)

A) 25ms-1

B) 40 ms-1

C) 55 ms-1

D) 65ms-1

E) 80 ms-1

#17. The S.l unit of magnetic flux density is

A) farad

B) henry

C) kgm-3

D) teslar

E) weber

#18. A narrow, uniform glass tube, closed at one end, constains air which is sealed by a thread of mercury. The tube is placed first horizontally and then vertically with the open end at the top. Which of the following statements is correct?

A) The length of the entrapped air in the horizontal position is less than that in the vertical position

B) The length of the entrapped air in the vertical position is less than that in the horizontal position

C) The length of the mercury column becomes shorter in the horizontal position than in the vertical position

D) The length of the mercury column becomes shorter in the vertical position than in the horizontal position

E) The pressure of the entrapped air is atmospheric in both cases.

#19. Which of the following motions will be produced by a pair of equal, opposite and non-collinear parallel forces acting on a body?

A) Oscillatory

B) Random

C) Rotational

D) Translational

E) Vibratory

#20. A body that produces its own light is said to be

A) luminous

B) non-incandescent

C) opaque

D) translucent

E) transparent

#21. Two equal capacitances are connected first in series and then in parallel. The ratio of the effective series capacitance to the effective parallel capacitance is

A) 0.25

B) 0.50

C) 1.00

D) 2.20

E) 4.00

#22. The motion of the prongs of a sounding turning fork is

A) circular

B) oscillatory

C) random

D) rotational

E) translational

#23. For which of the following sets are the units fundamental?

A) Area, length and volume

B) Impulse, mass and time

C) Length, time and mass

D) Velocity, distance and time

E) Volume, mass and density

#24. How much heat is required to convert 50g of water at 100°C to steam at the same temperature? (Specific latent heat of vaporization of water = 2260 Jg-11)

A) 1.13 × 10-4J

B) 1.31 × 102J

C) 1.30 × 104J

D) 1.13 × 105J

E) 1.31 × 106J

#25. Which of the following radiations have the longest wavelength?

A) Gamma rays

B) Infra-red

C) Light waves

D) Radio waves

E) Ultra-violet rays

#26. Young’s modulus of elasticity is the ratio of stress to strain, provided the load does not exceed the

A) breaking point

B) elastic limit

C) plastic limit

D) stress limit

E) yield point

#27. Which of the following instruments can be used to measure e.m.f. most accurately.

A) Ammeter

B) Galvanometer

C) Metre bridge

D) Potentiometer

E) Voltmeter

#28. Evaporation of a liquid produces cooling of the liquid because the

A) attraction between the vapour molecules and the liquid molecules is great

B) average kinetic energy of the liquid is reduced

C) density of the liquid decreases

D) vapour pressure above the liquid rises

E) volume of the liquid decreases

#29. Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5 A is passed through it for 100s.

A) 2.0 × 104J

B) 1.0 × 104J

C) 5.0 × 103J

D) 4.0 × 103J

E) 2.0 × 102J

#30. An electron makes a transition from a certain energy level Ek to the ground state E0. If the frequency of emission is 8.0 x 1014Hz The energy emitted is

A) 8.25 x 10-19J

B) 5.28 x 10-19J

C) 5.28 x 1019J

D) 8.25 x 1019J

#31. Given that young's modulus for aluminium is 7.0 x 1010Nm-2 and density is 2.7 x 103kgm-3 find the speed of the sound produced if a solid bar is struck at one end with a hammer

A) 5.1 x 103ms-1

B) 4.2 x 103ms-1

C) 3.6 x 103ms-1

D) 2.8 x 103ms-1

#32. If the uncertainty in the measurement of the position of a particle is 5.0 x 10-10m, the uncertainty in the momentum of the particle is

A) 1.32 x 10-44Ns

B) 3.30 x 10-44Ns

C) 1.32 x 10-24Ns

D) 3.30 x 10-24Ns

#33. In the calibration of an ammeter using faraday's laws of electrolysis, the ammeter reading is kept constant at 1.2A. If 0.990g of copper is deposited in 40 minutes , the correction to be applied to the ammeter is

A) 0.03A

B) 0.04A

C) 0.05A

D) 0.06A

#34. The major difference between a pure semiconductor and a pure metal is that

A) metals are harder than semiconductor

B) while resistance of metals decrease with temperature , the reverse is the case for semiconductor

C) the resistance of metals increases with temperature, while for semiconductors, it is the reverse

D) metals have forbidden gaps while semiconductors have not

#35. When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the

A) lost energy

B) work function

C) binding energy

D) stability energy

#36. When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the

A) lost energy

B) work function

C) binding energy

D) stability energy

#37. A circuit has an area of 0.4m2 and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rad s-1 in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is

A) 8V

B) 16V

C) 20V

D) 80V

#38. The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is

A) 90o

B) 45o

C) 30o

D) 0o

#39. The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.

A) 2.17V

B) 1.49V

C) 1.09V

D) 0.34V

#40. When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is

A) 1200W

B) 600W

C) 120W

D) 30W

#41. In a semi conductor junction diode, as the depletion or barrier layer is forward-biased, the layer

A) widens

B) narrows

C) remains constant

D) widens then narrows

#42. I It retains its magnetic much longer than steel. II It is more easily magnetized than steel III It is more easily demagnetized than steel IV It produces a stronger magnet than steel Which combination of the above makes iron preferable to steel in the making of electromagnets?

A) I and II only

B) II and III only

C) I, III, and IV only

D) II, III and IV only

#43. Which of the following pairs of light rays show the widest separation in the spectrum of white light

A) Blue and red

B) Green and yellow

C) Indigo and violet

D) Orange and red

#44. The most suitable cell used for short interval switches in electric bells is a

A) lead- acid accumulator

B) Daniel cell

C) Leclanche cell

D) nickel iron accumulator

#45. A ray incident on a glass prism undergoes minimum deviation when the

A) incident angle is equal to the angle of refraction

B) refraction angle equals 90o

C) incident angle equals 90o

D) incident angle is equal to the angle of emergence

#46. The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later

A) 200 count / min

B) 100 count / min

C) 50 count / min

D) 25 count / min

#47. The operation of an optical fibre is based on the principal of

A) dispersion of light

B) interference of light

C) refraction of light

D) polarization of light

#48. In the diagram above, what would happen to the current I, if another resistor, R2, is connected in parallel to R1?

A) It will increase because the equivalent resistance will increase

B) It will decrease if R2 is greater than R1

C) It will increase because the effective resistance will decrease

D) It will decrease if R2 is less than R1

#49. A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross-sectional area is halved, the new resistance is

A) 40Ω

B) 20Ω

C) 10Ω

D) 5Ω

#50. An electron of charge 1.6 x 10-19C is accelerated between two metal plates. If the kinetics energy of the electron is 4.8 x 10-17J, the potential difference between the plate is

A) 30V

B) 40V

C) 300V

D) 400V

Finish

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Physics Past Questions v28 for (JAMB/WAEC/NECO)

Results

#1. J.J. Thomson’s model of the atom was abandoned because

#2. Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain

#3. The volume of a given mass of gas is 40cm3 at 27° C. What is its volume at 90° C if its pressure remains constant?

#4. Which of the following statements is NOT true?

#5. A sheet of white paper viewed through blue glass appears blue because

#6. An object is placed 30 cm in front of a concave mirror of focal length 20cm. Calculate the distance between the object and the image.

#7. Which of the following properties is NOT exhibited by sound waves? A) Diffraction B) interference C) Polarisation D) Reflection E) Refraction

#8. An evidence of the wave nature of matter is

#9. The area under the curve of a velocity time graph represents

#10. Which of the following statements about the concept of solid friction is NOT true?

#11. The space surrounding a magnet in which the magnetic force is exerted is

#12. Calculate the critical angle for light travelling from water to air. (Refractive index of water = 1.33)

#13. A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the

#14. A transformer is required to give 120V from a 240V mains supply. If the primary has 5500 turns, how many turns has the secondary?

#15. A constant force of 5N acts for 5s on a mass of 5kg initially at rest. Calculate the final momentum of the mass.

#16. A stone is released from a height of 80m above the ground. Calculate its velocity just before it strikes the ground. (g=10ms-2)

#17. The S.l unit of magnetic flux density is

#18. A narrow, uniform glass tube, closed at one end, constains air which is sealed by a thread of mercury. The tube is placed first horizontally and then vertically with the open end at the top. Which of the following statements is correct?

#19. Which of the following motions will be produced by a pair of equal, opposite and non-collinear parallel forces acting on a body?

#20. A body that produces its own light is said to be

#21. Two equal capacitances are connected first in series and then in parallel. The ratio of the effective series capacitance to the effective parallel capacitance is

#22. The motion of the prongs of a sounding turning fork is

#23. For which of the following sets are the units fundamental?

#24. How much heat is required to convert 50g of water at 100°C to steam at the same temperature? (Specific latent heat of vaporization of water = 2260 Jg-11)

#25. Which of the following radiations have the longest wavelength?

#26. Young’s modulus of elasticity is the ratio of stress to strain, provided the load does not exceed the

#27. Which of the following instruments can be used to measure e.m.f. most accurately.

#28. Evaporation of a liquid produces cooling of the liquid because the

#29. Calculate the amount of heat generated in an external load of resistance 8Ω if an alternating current of peak value 5 A is passed through it for 100s.

#30. An electron makes a transition from a certain energy level Ek to the ground state E0. If the frequency of emission is 8.0 x 1014Hz The energy emitted is

#31. Given that young's modulus for aluminium is 7.0 x 1010Nm-2 and density is 2.7 x 103kgm-3 find the speed of the sound produced if a solid bar is struck at one end with a hammer

#32. If the uncertainty in the measurement of the position of a particle is 5.0 x 10-10m, the uncertainty in the momentum of the particle is

#33. In the calibration of an ammeter using faraday's laws of electrolysis, the ammeter reading is kept constant at 1.2A. If 0.990g of copper is deposited in 40 minutes , the correction to be applied to the ammeter is

#34. The major difference between a pure semiconductor and a pure metal is that

#35. When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the

#36. When a nucleus is formed by bringing protons and neutrons together, the actual mass of the formed nucleus is less than the sum of the masses of the energy equivalent of this mass difference is the

#37. A circuit has an area of 0.4m2 and consists of 50 loops of wire. If the loops are twisted and allowed to rotate at a constant angular velocity of 10 rad s-1 in a uniform magnetic field of 0.4T, the amplitude of the induced voltage is

#38. The force on a charge moving with velocity v in a magnetic field B is half of the maximum force when the angle between v and B is

#39. The maximum kinetic energy of the photoelectron emitted from a metal surface is 0.34eV. If the work function of the metal surface is 1.83eV,find the stopping potential.

#40. When an alternating current given by I = 10sin (120π)t passes through a 12Ω resistor, the power dissipated in the resistor is

#41. In a semi conductor junction diode, as the depletion or barrier layer is forward-biased, the layer

#42. I It retains its magnetic much longer than steel. II It is more easily magnetized than steel III It is more easily demagnetized than steel IV It produces a stronger magnet than steel Which combination of the above makes iron preferable to steel in the making of electromagnets?

#43. Which of the following pairs of light rays show the widest separation in the spectrum of white light

#44. The most suitable cell used for short interval switches in electric bells is a

#45. A ray incident on a glass prism undergoes minimum deviation when the

#46. The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4 days, what would the count rate be in 16 days later

#47. The operation of an optical fibre is based on the principal of

#48. In the diagram above, what would happen to the current I, if another resistor, R2, is connected in parallel to R1?

#49. A wire of 5Ω resistance is drawn out so that its new length is two times the original length. If the resistivity of the wire remains the same and the cross-sectional area is halved, the new resistance is

#50. An electron of charge 1.6 x 10-19C is accelerated between two metal plates. If the kinetics energy of the electron is 4.8 x 10-17J, the potential difference between the plate is

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