Physics Past Questions v37 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 v37 For (JAMB/WAEC/NECO)

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#1. A 120V, 60W lamp is to be operated on 220V ac supply mains. calculate the value of non inductive resistance that would be required to ensure that the lamp is run on correct value

A) 100Ω

A) 100Ω

B) 200Ω

B) 200Ω

C) 300Ω

C) 300Ω

D) 500Ω

D) 500Ω

#2. A 40KW electric cable was uses to transmit electricity through a resistor of resistance 2.00Ω at 800V. The power loss as internal energy is

A) 4.0 x 102W

A) 4.0 x 102W

B) 5.0 x 102W

B) 5.0 x 102W

C) 4.0 x 103W

C) 4.0 x 103W

D) 5.0 x 103W

D) 5.0 x 103W

#3. Two long parallel wires X and Y carry currents 3A and 5A each. if the force experienced by unit length is 5 x 10-5N. the force per unit length experienced by wire Y is

A) 3 x 10-5

A) 3 x 10-5

B) 3 x 10-6

B) 3 x 10-6

C) 5 x 105

C) 5 x 105

D) 5 x 10-5

D) 5 x 10-5

#4. Lenz's law is a law of conservation of

A) electric charge

A) electric charge

B) electric current

B) electric current

C) Energy

C) Energy

D) Momentum

D) Momentum

#5. A particle of weight 120N is placed on a plane inclined at 300 to the horizontal. If the plane has an efficiency of 60% to the floor what is the force required to push the weight uniformly up the plane?

A) 50N

A) 50N

B) 100N

B) 100N

C) 175N

C) 175N

D) 210N

D) 210N

#6. A string of length 4m is extended by 0.02m when a load of 0.4kg is suspended at its end. What will be the length of the string when the applied force is 15N?

A) 4.05m

A) 4.05m

B) 4.08m

B) 4.08m

C) 5.05m

C) 5.05m

D) 6.08m

D) 6.08m

#7. Which of the following gas laws is equivalent to the work done?

A) Boyle' law

A) Boyle' law

B) Charles law

B) Charles law

C) Pressure law

C) Pressure law

D) van der Waal's law

D) van der Waal's law

#8. The difference observed in solids, liquids and gases can be accounted for by

A) The different molecules in each of them

A) The different molecules in each of them

B) The spaces and forces acting between the molecules

B) The spaces and forces acting between the molecules

C) Thier melting points

C) Thier melting points

D) Their relative massess

D) Their relative massess

#9. 118.8cm2 surface of the copper cathode of a voltameter is to be coated with 10-6m thick copper of density 9 x 103kgm-3. How long will the process run with 10A constant current? [3.3 x 10-7kgC-1]

A) 5.4 min

A) 5.4 min

B) 10.8 min

B) 10.8 min

C) 15.0 min

C) 15.0 min

D) 20.0 min

D) 20.0 min

#10. From the diagram above, the inductive reactance and the resistance R are respectively

A) 50Ω and 45Ω

A) 50Ω and 45Ω

B) 25Ω and 51Ω

B) 25Ω and 51Ω

C) 20Ω and 50Ω

C) 20Ω and 50Ω

D) 10Ω and 49Ω

D) 10Ω and 49Ω

#11. The fundamental frequency of a plucked wire under a tension of 400N is 250Hz. When the frequency is changed to 500 Hz at constant length, the tension is

A) 1600N

A) 1600N

B) 400N

B) 400N

C) 160N

C) 160N

D) 40N

D) 40N

#12. Three cells each of e.m.f 1.5 V and internal resistance 2.5Ω are connected as shown in the diagram above. Find the net e.m.f and the internal resistance

A) 1.5V, 7.50Ω

A) 1.5V, 7.50Ω

B) 1,5V, 0.83Ω

B) 1,5V, 0.83Ω

C) 4.5V, 7.50Ω

C) 4.5V, 7.50Ω

D) 4.5V, 0.83Ω

D) 4.5V, 0.83Ω

#13. In the diagram above , if the magnetic field points into the paper and the force on a current - carrying conductor points upwards, what is the direction of the current?

A) Upwards

A) Upwards

B) Downwards

B) Downwards

C) Right

C) Right

D) Left

D) Left

#14. The instantaneous value of the induced e.m.f as a function of time is ε = εo sin ωt where εo is the peak value of the e.m.f. The instantaneous value of the e.m.f., one quarter of the period is

A) 0.00

A) 0.00

B) εo/4

B) εo/4

C) εo/2

C) εo/2

D) εo

D) εo

#15. From the diagram above, the bob of the pendulum has the fastest speed at

A) X

A) X

B) Y

B) Y

C) Z

C) Z

D) W

D) W

#16. In the diagram above, a rod 50 cm long of uniform cross-section is suspended horizontally on a fulcrum, F, by the action of two forces. What is the weight of the rod?

A) 40N

A) 40N

B) 80N

B) 80N

C) 120N

C) 120N

D) 200N

D) 200N

#17. A boy drags a bag of rice along a smooth horizontal floor with a force of 2N applied at the angle of 60o to the floor. The work done after a distance of 3m is

A) 3 J

A) 3 J

B) 4 J

B) 4 J

C) 5 J

C) 5 J

D) 6 J

D) 6 J

#18. A blacksmith heated a metal whose cubic expansivity is 6.3 x 10-6K-1. The areal expansivity is

A) 2.0 x 10-6K-1

A) 2.0 x 10-6K-1

B) 2.1 x 10-6K-1

B) 2.1 x 10-6K-1

C) 4.2 x 10-6K-1

C) 4.2 x 10-6K-1

D) 6.3 x 10-6K-1

D) 6.3 x 10-6K-1

#19. The ratio of the coefficient of linear expansion of two metals ∝1/∝2 is 3:4. If, when heated through the same temperature change, the ratio of the increase in length of the two metals, e1/e2 is 1:2, the ratio of the original lengths l1/l2 is

A) 8/3

A) 8/3

B) 3/2

B) 3/2

C) 2/3

C) 2/3

D) 3/8

D) 3/8

#20. The figure above shows 4 forces 3N, 10N, 3√3N and 6N acting on a particle P. The resultant of he four forces is

A) 5N

A) 5N

B) 5√ 3N

B) 5√ 3N

C) 10N

C) 10N

D) 10√ 3N

D) 10√ 3N

#21. A 120 V, 60 W lamp is to be operated on 220 V a.c. the supply mains. calculate the values of non-inductive resistance that would be required to ensure that the lamp is run on current value.

A) 100 Ω

A) 100 Ω

B) 200 Ω

B) 200 Ω

C) 300 Ω

C) 300 Ω

D) 500 Ω

D) 500 Ω

#22. A radioactive substance has a half-life of 20 days what fraction the original radiation nuclei will remain after 80 days?

A) (1)/32

A) (1)/32

B) (1)/16

B) (1)/16

C) (1)/ 8

C) (1)/ 8

D) (1)/4

D) (1)/4

#23. The energy E of a photon and it's wavelength are related by Eλ = X. the numerical value of X is? [h = 6.63 x 10-34js, c = 3 x 108 ms-1]

A) 6.6 X 10-28

A) 6.6 X 10-28

B) 1.99 X 10-27

B) 1.99 X 10-27

C) 6.60 x 10-26

C) 6.60 x 10-26

D) 1.99 x 10-25

D) 1.99 x 10-25

#24. The bond that forms a semiconductor is?

A) covalent

A) covalent

B) electrovalent

B) electrovalent

C) ionic

C) ionic

D) metallic

D) metallic

#25. Silicon doped with aluminum and germanium doped with arsenic become?

A) p- and n- types respectively

A) p- and n- types respectively

B) n- en p- type respectively

B) n- en p- type respectively

C) p- type semiconductor

C) p- type semiconductor

D) n- type semiconductors

D) n- type semiconductors

#26. A charge 50 µc has electric field strength of 360 NC-1 at a certain point. The electric field strength due to another charge 120 µc kept at the same distance apart and in the same medium is?

A) 864 NC-1

A) 864 NC-1

B) 150 NC-1

B) 150 NC-1

C) 144 NC-1

C) 144 NC-1

D) 18 NC-1

D) 18 NC-1

#27. If two charged plates are maintained at a potential difference of 3 kv, the work done in taking a charge of 600 µC across the field is?

A) 0.8 J

A) 0.8 J

B) 1.8 J

B) 1.8 J

C) 9.0 J

C) 9.0 J

D) 18.0 J

D) 18.0 J

#28. A conductor has a diameter of 1.00 mm and length 2.00m. if the resistance of the material is 0.1Ω, its resistivity is?

A) 2.55 x 105 Ωm

A) 2.55 x 105 Ωm

B) 2.55 x 102 Ωm

B) 2.55 x 102 Ωm

C) 3.93 x 10-6 Ωm

C) 3.93 x 10-6 Ωm

D) 3.93 x 10-8 Ωm

D) 3.93 x 10-8 Ωm

#29. A 40 kW electric cable is used to transmit electricity through a resistor of resistance 2.0Ω at 800 V. The power loss as internal energy is?

A) 4.0 x 102W

A) 4.0 x 102W

B) 5.0 x 102W

B) 5.0 x 102W

C) 4.0 x 103W

C) 4.0 x 103W

D) 5.0 x 103W

D) 5.0 x 103W

#30. The instrument that measures both a.c and d.c is?

A) a current balance

A) a current balance

B) a moving current ammeter

B) a moving current ammeter

C) a moving iron ammeter

C) a moving iron ammeter

D) an inverter

D) an inverter

#31. The phenomenon of light bending round an obstacle is?

A) diffraction

A) diffraction

B) refraction

B) refraction

C) reflection

C) reflection

D) polarization

D) polarization

#32. The instrument used by designers to obtain different color pattern is called?

A) periscop

A) periscop

B) sextant

B) sextant

C) episcope

C) episcope

D) kaleidoscope

D) kaleidoscope

#33. A glass plate 0.9cm thick has a reflective index of 1.50. how long does it take for a pulse of light to pass through the plate? [c = 3.0 x 8 ms-1]

A) 4.5 x 10-11s

A) 4.5 x 10-11s

B) 4.5 x 10-10s

B) 4.5 x 10-10s

C) 4 .5 x 10-12 s

C) 4 .5 x 10-12 s

D) 3.0 x 10-10s

D) 3.0 x 10-10s

#34. When an object is placed between the principal focus and the optical center of a convex lens, it could be used as a?

A) Simple microscope

A) Simple microscope

B) refecting lens

B) refecting lens

C) compound microscope

C) compound microscope

D) projector

D) projector

#35. The production of pure spectrum could easily be achieved using a?

A) glass prism with a pin

A) glass prism with a pin

B) triangular prism with two convex lens

B) triangular prism with two convex lens

C) traingular prism only

C) traingular prism only

D) triangular prism with two concave lenses

D) triangular prism with two concave lenses

#36. I. Increase the melting point of the liquid. II. Increase the boiling point of the liquid. III. Decrease the melting point of the liquid. IV. Decrease the boiling point of the liquid. Which of the statement above about the effect on increase in pressure in a liquid are correct?

A) I and II only

A) I and II only

B) I and III only

B) I and III only

C) II and III only

C) II and III only

D) III and IV only

D) III and IV only

#37. I. Mass II. Density III. Temperature IV. Nature of substance Which of the above affect diffusion?

A) I and II only

A) I and II only

B) I,II and IV only

B) I,II and IV only

C) II, III and IV only

C) II, III and IV only

D) I, II, III and IV

D) I, II, III and IV

#38. The blade of a hoe feel colder to touch in the morning than the wooden handle because the

A) handle is a better conductor of heat than blade

A) handle is a better conductor of heat than blade

B) handle contains stored energy in form of heat

B) handle contains stored energy in form of heat

C) blade is a better conductor of heat than the handle

C) blade is a better conductor of heat than the handle

D) blade is placed at a lower temperature than the heat

D) blade is placed at a lower temperature than the heat

#39. I. They should be identical II. They should originate from the same source. III. They should be coherent. IV. They should be monochromatic. From the statements above, the conditions for two waves to interfere are?

A) I,II and III only

A) I,II and III only

B) I, III and IV only

B) I, III and IV only

C) II, III and IV only

C) II, III and IV only

D) I, II, III and IV

D) I, II, III and IV

#40. In a large telecommunications auditorium, perforated absorbent materials are used to line the ceiling so as to

A) Increase the reverberation of sound in the hall

A) Increase the reverberation of sound in the hall

B) increase the amount of echo in the hall

B) increase the amount of echo in the hall

C) reduce the hight of the ceiling from the floor

C) reduce the hight of the ceiling from the floor

D) reduce the reverberation of sound in the hall

D) reduce the reverberation of sound in the hall

#41. A reservoir 500 m deep is filled with a fluid of density 850 kgm-3. If the atmospheric pressure is 1.05 x 105 Nm-2, the pressure at the bottom of the reservoir is. [g = 10ms-2]

A) 4.72 x 106 Nm-2

A) 4.72 x 106 Nm-2

B) 4.36 x 106 Nm-2

B) 4.36 x 106 Nm-2

C) 4.28 x 106 Nm-2

C) 4.28 x 106 Nm-2

D) 4.25 x 106 Nm-2

D) 4.25 x 106 Nm-2

#42. A piece of iron weights 250 N in air and 200 N in a liquid of density 1000 kgm-3. the volume of the iron is?

A) 5.0 x 10-2 ms-2

A) 5.0 x 10-2 ms-2

B) 4.5 x 10--2 ms-3

B) 4.5 x 10--2 ms-3

C) 2.5 x 10-2 ms-8

C) 2.5 x 10-2 ms-8

D) 2.0 x 10-2 ms-3

D) 2.0 x 10-2 ms-3

#43. A clinical thermometer is different from other mercury in glass thermometers owing to

A) the constriction on its stem

A) the constriction on its stem

B) the grade of mercury used in it

B) the grade of mercury used in it

C) its long stem

C) its long stem

D) its wide range of temperatures

D) its wide range of temperatures

#44. I. Use a liquid with a high melting point. II. use a liquid of high volume expansivity. III. use a capillary tube of large diameter. which of the above best describes how the sensitivity of a liquid-in-glass thermometer can be enhanced?

A) I only

A) I only

B) II. only

B) II. only

C) I and II only

C) I and II only

D) II and III only

D) II and III only

#45. 2 kg of water is heated with a heating coil which draws 3.5 A from a 200 V mains for 2 minutes. what is the increase in temperature of the water? [specific heat capacity of water = 4200 jkg -1k-1]

A) 30°

A) 30°

B) 25°

B) 25°

C) 15°

C) 15°

D) 10°

D) 10°

#46. The unit of moment of a couple can be expressed in?

A) N m-1

A) N m-1

B) N m-2

B) N m-2

C) N m

C) N m

D) N m2

D) N m2

#47. A car of mass 1500 kg goes round a circular curve of radius 50m at a speed of 40 ms-1. The magnitude of the centripetal force on the car is ?

A) 4.8 x 104 N

A) 4.8 x 104 N

B) 4.8 x 103 N

B) 4.8 x 103 N

C) 1.2 x 103 N

C) 1.2 x 103 N

D) 1.2 x 102 N

D) 1.2 x 102 N

#48. Two spheres of masses 5.0 kg and 10.0 kg are 0.3 m apart. Calculate the force of attraction between them? [G = 6.67 X 10-11 Nm2 Kg2]

A) 3.50 x 10-10N

A) 3.50 x 10-10N

B) 3.71 x 10-8 N

B) 3.71 x 10-8 N

C) 3.57 x 10-2N

C) 3.57 x 10-2N

D) 4.00 x 102N

D) 4.00 x 102N

#49. A machine has a velocity ratio of 4. if it requires 800 N to overcome a load of 1600 N,what is the efficiency of the machine?

A) 60%

A) 60%

B) 50%

B) 50%

C) 40%

C) 40%

D) 2%

D) 2%

#50. The diagram above illustrates three forces acting on an object at point O. If the object is in equilibrium, determine the magnitude of the force P.

A) 10.5N

A) 10.5N

B) 11.0N

B) 11.0N

C) 17.3N

C) 17.3N

D) 20.0N

D) 20.0N

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