Physics Past Questions v45 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 v45 For (JAMB/WAEC/NECO)

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#1. If the volume of a gas increases steadily as the temperature decreases at constant pressure, the gas obeys

A) Graham's Law

A) Graham's Law

B) Boyle's Law

B) Boyle's Law

C) Pressure law

C) Pressure law

D) Charles Law E) No Correct Option

D) Charles Law E) No Correct Option

#2. In homes, electrical appliances and lamps are connected in parallel because

A) Parallel connections do not heat up the wires

A) Parallel connections do not heat up the wires

B) series connections use high voltage

B) series connections use high voltage

C) less current will be used

C) less current will be used

D) less voltage will be used

D) less voltage will be used

#3. Two resistors 5Ω and 10Ω are arranged first in series and later in parallel to a 24V source, the ratio of total power dissipated in the series and parallel arrangements respectively is

A) 5:3

A) 5:3

B) 1:50

B) 1:50

C) 50:1

C) 50:1

D) 3:5

D) 3:5

E) No Correct Option

E) No Correct Option

#4. The bond between silicon and germanium is

A) dative

A) dative

B) covalent bond

B) covalent bond

C) trivalent

C) trivalent

D) ionic

D) ionic

#5. An image in a convex lens is upright and magnified 3 times. If the focal length of the lens is 15 cm, what is the object distance?

A) 10 cm

A) 10 cm

B) 25 cm

B) 25 cm

C) 16 cm

C) 16 cm

D) 14 cm

D) 14 cm

#6. A length of wire has a frequency of 255Hz when stretched by a force of b225N. If the fore increased to 324N, what is the new frequency of vibration

A) 306 Hz

A) 306 Hz

B) 512 Hz

B) 512 Hz

C) 488 Hz

C) 488 Hz

D) 356 Hz

D) 356 Hz

#7. In the circuit above, three resistors, 2Ω, 4Ω and 12Ω are connected in parallel and a 12V battery is connected across the combination. The current flowing through the 12Ω resistors is

A) 14.4 A

A) 14.4 A

B) 1.0 A

B) 1.0 A

C) 3.2 A

C) 3.2 A

D) 9.6 A

D) 9.6 A

#8. The diagram above shows two vectors at right angles to each other. The value of the resultant vector is

A) 14.0 N

A) 14.0 N

B) 10.0 N

B) 10.0 N

C) 12.0 N

C) 12.0 N

D) 13.0 N

D) 13.0 N

#9. The diagram above show the positions of a cone. The position which can be described as neutral equilibrium is represented as

A) Z only

A) Z only

B) X only

B) X only

C) Y and Z

C) Y and Z

D) Y and X

D) Y and X

#10. The correct expression for the potential at a point distance r from a charge q in an electric field is

A) _q2 4πεor2

A) _q2 4πεor2

B) _q2 4πεor

B) _q2 4πεor

C) _q 4πεor2

C) _q 4πεor2

D) _q 4πεor

D) _q 4πεor

#11. The electrical properties of germanium can be altered drastically by the addition of impurity. This process is referred to as

A) saturation

A) saturation

B) bonding

B) bonding

C) amplification

C) amplification

D) dopping

D) dopping

#12. If the threshold frequency for tungsten is 1.3 x 1015Hz, what is its work function? [H = 6.6 x 10-34 Js]

A) 8.58 x 10-19 J

A) 8.58 x 10-19 J

B) 8.50 x 10-15 J

B) 8.50 x 10-15 J

C) 8.58 x 10-17 J

C) 8.58 x 10-17 J

D) 8.85 x 10-18

D) 8.85 x 10-18

#13. Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?

A) X is the anode and very high current is used

A) X is the anode and very high current is used

B) X is the anode and Y is the cathode

B) X is the anode and Y is the cathode

C) Y is the cathode and X is the anode

C) Y is the cathode and X is the anode

D) Y is the anode and very high current is used

D) Y is the anode and very high current is used

#14. Under which of the following conditions do gases conduct electricity?

A) Low presssure and low p.d

A) Low presssure and low p.d

B) low pressure and high p.d

B) low pressure and high p.d

C) high pressure an low p.d

C) high pressure an low p.d

D) high pressure and high p.d

D) high pressure and high p.d

#15. Two inductors of inductance 4 II and 8 II are arrange in series and a current of 10 A is passed through them. What is the energy stored in them?

A) 500 J

A) 500 J

B) 50 J

B) 50 J

C) 133 J

C) 133 J

D) 250 J

D) 250 J

#16. Which of the following materials has an increase in resistance with temperature?

A) water

A) water

B) metals

B) metals

C) wood

C) wood

D) electrolyte

D) electrolyte

#17. The bond between silicon and germanium is

A) covalent

A) covalent

B) ionic

B) ionic

C) dative

C) dative

D) electrovalent

D) electrovalent

#18. A radioactive isotope has a decay constant of 10-5s4. Calculate half life

A) 6.93 x 105s

A) 6.93 x 105s

B) 6.93 x 105s

B) 6.93 x 105s

C) 6.93 x104s

C) 6.93 x104s

D) 6.93 x 104s

D) 6.93 x 104s

#19. A certain far - sighted person cannot see object that are closer to the eye than 50 cm clearly. Determine the power of the converging lens which will enable him to see at 25 cm

A) 0.06 D

A) 0.06 D

B) 0.02 D

B) 0.02 D

C) 0.03 D

C) 0.03 D

D) 0.04 D

D) 0.04 D

E) no option is correct

E) no option is correct

#20. The eclipse of the sun occurs when the

A) moon is between the sun and the earth

A) moon is between the sun and the earth

B) earth is between the sun and the moon

B) earth is between the sun and the moon

C) moon is not completely hidden in the earth's shadow

C) moon is not completely hidden in the earth's shadow

D) moon's umbra falls on some part of the earth

D) moon's umbra falls on some part of the earth

#21. Which of the following is a property of steel?

A) it cannot retain its magnetism longer than iron

A) it cannot retain its magnetism longer than iron

B) it can be used for making temporary magnets

B) it can be used for making temporary magnets

C) it can be used for making permanent magnets

C) it can be used for making permanent magnets

D) it can easily be magnetized and demagnetized

D) it can easily be magnetized and demagnetized

#22. In measuring high frequency a.c, the instrument used is the

A) d.c ammeter

A) d.c ammeter

B) moving coil ammeter

B) moving coil ammeter

C) moving iron ammeter

C) moving iron ammeter

D) hot wire ammeter

D) hot wire ammeter

#23. If the charge of electricity is K wh is N4, what is the cost of operating an electrical appliance rated 250 V, 2 A for six hours?

A) N28

A) N28

B) N12

B) N12

C) N16

C) N16

D) N24

D) N24

#24. I. change of state II. Diffusion III. Radiation IV. Osmosis Which of the processes above can be explained using the kinetic theory?

A) I, II,III and IV

A) I, II,III and IV

B) I, II and III

B) I, II and III

C) I, III and IV

C) I, III and IV

D) I, II and IV

D) I, II and IV

#25. Three similar cells each of e.m.f 2 v and internal resistance 2Ω are connected in parallel, the total e.m.f and total internal resistance are respectively

A) 6 v, 6.0Ω

A) 6 v, 6.0Ω

B) 2 v, 0.7Ω

B) 2 v, 0.7Ω

C) 2 v, 6.0Ω

C) 2 v, 6.0Ω

D) 6 v, 0.7Ω

D) 6 v, 0.7Ω

#26. When the human eye loses its power of accomodation, the defect is known as

A) short sightedness

A) short sightedness

B) presbyobia

B) presbyobia

C) astigmatism

C) astigmatism

D) long sightedness

D) long sightedness

#27. When a red rose flower is observed in blue light, what colour does the observer see?

A) Red

A) Red

B) Blue

B) Blue

C) Magenta

C) Magenta

D) yellow

D) yellow

E) No correct option

E) No correct option

#28. The capacitance of a parallel plate capacitor is 20 μf in air and 60 μf in the presence of a dielectric. What is the dielectric constant?

A) 0.3

A) 0.3

B) 6.0

B) 6.0

C) 3.0

C) 3.0

D) 2.0

D) 2.0

#29. The ground is always cold at night because the

A) atmosphere absorbs the sun's energy at night

A) atmosphere absorbs the sun's energy at night

B) earth radiates heat to the atmosphere at night

B) earth radiates heat to the atmosphere at night

C) sun no longer shine at night

C) sun no longer shine at night

D) atmosphere reflects the sun's energy at night

D) atmosphere reflects the sun's energy at night

#30. A cannon is fired from town X, after how long is the sound heard at a town Y 4.95 km away? [velocity of sound in the air = 330 ms-1]

A) 30 s

A) 30 s

B) 10 s

B) 10 s

C) 10 s

C) 10 s

D) 15 s

D) 15 s

#31. The phenomenon that shows that increase in pressure lowers the melting point can be observed in

A) sublimation

A) sublimation

B) condensation

B) condensation

C) coagulation

C) coagulation

D) regelation

D) regelation

#32. Steam burn is more severe than that of boiling water because

A) steam burn is independent of relative humidity

A) steam burn is independent of relative humidity

B) stem possesses greater heat energy per unit mass

B) stem possesses greater heat energy per unit mass

C) water boils at a higher temperature

C) water boils at a higher temperature

D) steam burn is dependent on relative humidity

D) steam burn is dependent on relative humidity

#33. I. Density of the liquid. II. Depth below the surface of the liquid. III. Surface area of the liquid. In which of the statement above will pressure be dependent?

A) I and II only.

A) I and II only.

B) II and III only.

B) II and III only.

C) I, II and III only.

C) I, II and III only.

D) I and III only.

D) I and III only.

#34. Which of the following could be effectively used to reduce friction?

A) kerosene

A) kerosene

B) grease

B) grease

C) water

C) water

D) petrol

D) petrol

#35. Which of the following types of waves needs a medium for propagation?

A) sound waves

A) sound waves

B) light waves

B) light waves

C) radio waves

C) radio waves

D) x - rays

D) x - rays

#36. Which of the following electromagnetic waves has the highest frequency?

A) utra - violet rays

A) utra - violet rays

B) radio waves

B) radio waves

C) x - rays

C) x - rays

D) infrared - rays

D) infrared - rays

#37. A perfect emitter or absorber of radiant energy is a

A) conductor

A) conductor

B) black body

B) black body

C) white body

C) white body

D) red body

D) red body

#38. A machine is used to lift a load of 20 N through a height of 10 m. if the efficiency of the machine is 40%, how much work is done?

A) 80 J

A) 80 J

B) 500 J

B) 500 J

C) 300 J

C) 300 J

D) 120 J

D) 120 J

#39. An object weighs 22 kg in water and 30kg in air. what is the upthrust exerted by the liquid on the object. [g = 10 ms2]

A) 50 N

A) 50 N

B) 520 N

B) 520 N

C) 220 N

C) 220 N

D) 80 N

D) 80 N

#40. A metal of volume 40 cm3 is heated from 30 °c to 90 °c, the increase in volume is

A) 0.12 cm3

A) 0.12 cm3

B) 4.00 cm3

B) 4.00 cm3

C) 1.20 cm3

C) 1.20 cm3

D) 0.40 cm3

D) 0.40 cm3

E) no correct option

E) no correct option

#41. A copper wire was subjected to a tensile stress of 7.7 x 107 x 10 Nm-2. calculate strain of the wire. [young modules = 1.1 x 1011 Nm-2]

A) 2. 0 x 10-5

A) 2. 0 x 10-5

B) 7.0 x 10-3

B) 7.0 x 10-3

C) 7.0 x 10-4

C) 7.0 x 10-4

D) 2.2 x 10-4

D) 2.2 x 10-4

#42. I. High thermal capacity. II. High sensitivity. III.Easy readability. IV. Accuracy over a wide range of temperature From the statement above, the qualities of a good thermometer are

A) I and II

A) I and II

B) I, II,III and IV

B) I, II,III and IV

C) I, III and IV

C) I, III and IV

D) II, III and IV

D) II, III and IV

#43. Two balls X and Y weighing 5 g and 50 kg respectively were throne up vertically at the same time with a velocity of 100 ms1 .How will their positions be one second later?

A) X and Y will be 500 m from each other

A) X and Y will be 500 m from each other

B) Y will be 500 m ahead of X

B) Y will be 500 m ahead of X

C) X will be 500 m ahead of Y

C) X will be 500 m ahead of Y

D) X and Y both be 500 m from the poin of throw

D) X and Y both be 500 m from the poin of throw

#44. If it takes an object 3s to fall freely to the ground from a certain height, what is the distance covered by the object?

A) 90 m

A) 90 m

B) 30 m

B) 30 m

C) 45 m

C) 45 m

D) 60 m

D) 60 m

#45. An object of mass 2 kg moves with a velocity of 10 ms1 round at circle of radius 4 m. Calculate the centripetal force on the object

A) 25 N

A) 25 N

B) 100 N

B) 100 N

C) 50 N

C) 50 N

D) 40 N

D) 40 N

#46. A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is? [g = 10 ms-2]

A) 600 J

A) 600 J

B) 150J

B) 150J

C) 300 J

C) 300 J

D) 450 J

D) 450 J

#47. If a tube of small radius opened at both ends is placed in a liquid, the liquid will

A) remain at the same level irrespective of whether the liquid wet the glass or not

A) remain at the same level irrespective of whether the liquid wet the glass or not

B) fall below the liquid level if the liquid wets the glass

B) fall below the liquid level if the liquid wets the glass

C) falls below the liquid level if the liquid does not wet the glass

C) falls below the liquid level if the liquid does not wet the glass

D) rise above the liquid level if the liquid does not wet the glass

D) rise above the liquid level if the liquid does not wet the glass

#48. A man standing on a lift that is descending does not feel any weight because

A) the inside of the lift is air tight

A) the inside of the lift is air tight

B) the lift is in vacuum

B) the lift is in vacuum

C) there is no reaction from the floor of the lift

C) there is no reaction from the floor of the lift

D) there is no gravitational pull on the man in the lift

D) there is no gravitational pull on the man in the lift

#49. A block of aluminum is heated electrically by a 25 W heater. if the temperature rises by 10°C in 5 minutes, the heat capacity of the aluminum is?

A) 850 JK-1

A) 850 JK-1

B) 750 JK-1

B) 750 JK-1

C) 650 JK-1

C) 650 JK-1

D) 500 JK-1

D) 500 JK-1

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