Physics Past Questions v11 For (JAMB/WAEC/NECO); These Physics past questions are for students who are sitting for the following examinations

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#1. The length of a side of a metallic cube at 20° C is 5.0cm. Given that the linear expansively of the metal is 4.0 × 10-5K-1, find the volume of the cube at 120° C

A) 124.50cm3

A) 124.50cm3

B) 125.00cm3

B) 125.00cm3

C) 126.00cm3

C) 126.00cm3

D) 126.25cm3

D) 126.25cm3

E) 126.50cm3

E) 126.50cm3

#2. In the above, a voltage V is applied across the terminals P and Q. The voltage across the 1 ohm resistor is

A) V/8

A) V/8

B) V/4

B) V/4

C) V/3

C) V/3

D) V/2

D) V/2

#3. In the figure above, M and N are insulated metal spheres in contact. A negatively charged ebonite rod P is I brought near M. When M and N are Separated and the rod is taken away, which of the following statements is correct

A) both M and N have acquired negative charges

A) both M and N have acquired negative charges

B) both M and N have acquired positive charges

B) both M and N have acquired positive charges

C) M has acquired negative charge and N positive charge

C) M has acquired negative charge and N positive charge

D) N has acquired negative charge and M positive charge

D) N has acquired negative charge and M positive charge

#4. The velocity time graph above describes the motion of a particle between two points P and Q. What is the distance between P and Q?

A) 17.0m

A) 17.0m

B) 18.0m

B) 18.0m

C) 22.5m

C) 22.5m

D) 30.0m

D) 30.0m

#5. The fig above shows two connected bodies of masses M1 and M2 in equilibrium under gravity. The tension in the upper string is

A) (m1-m2)g

A) (m1-m2)g

B) m1g

B) m1g

C) m2g

C) m2g

D) (m1+m2)g

D) (m1+m2)g

#6. A 50kg block is dropped from a point 10cm above as shown in the fig above. if the force constant of the spring is 4.0 x 104Nm-1, find the maximum compression of the spring [g = 10ms-2]

A) 1.25m

A) 1.25m

B) 0.50m

B) 0.50m

C) 0.25m

C) 0.25m

D) 0.05m

D) 0.05m

#7. The fig above represents the main sequence of energy conversion at Kainji dam. What is the efficiency of the system?

A) Q1/Q2

A) Q1/Q2

B) E/Q1 )

B) E/Q1 )

C) E/(Q1-Q2)

C) E/(Q1-Q2)

D) E/(Q1-Q2)

D) E/(Q1-Q2)

#8. Which of the following statements is TRUE of photoelectric effect?

A) it cannot occur in liquids

A) it cannot occur in liquids

B) the energy of the emitted electrons is independent of the work function of the surface

B) the energy of the emitted electrons is independent of the work function of the surface

C) the energy of the emitted electron depends on the wavelength of the incident light

C) the energy of the emitted electron depends on the wavelength of the incident light

D) the greater the intensity of the incuident light, the greater the incident of the emitted electron

D) the greater the intensity of the incuident light, the greater the incident of the emitted electron

#9. Isotopes are nuclei which have

A) the same number of nuetrons and electrons

A) the same number of nuetrons and electrons

B) equal number of electrons and protons

B) equal number of electrons and protons

C) the same atomic number but different number of neutrons

C) the same atomic number but different number of neutrons

D) the same number of total particles

D) the same number of total particles

#10. When a transformer has more secondary windings than primary windings, it

A) has a smaller secondary current

A) has a smaller secondary current

B) has a greater power output

B) has a greater power output

C) is a step-down transformer

C) is a step-down transformer

D) increases the total energy output

D) increases the total energy output

#11. A current of 0.5A flows through a resistor when connected to a 40-V battery. How much energy is dissipated in 2 minutes?

A) 1200J

A) 1200J

B) 1500J

B) 1500J

C) 2400J

C) 2400J

D) 96000J

D) 96000J

#12. The direction of the magnetic field at a point in the vicinity of a bar magnet is

A) always towards the north pole of the magnet

A) always towards the north pole of the magnet

B) always away from the south pole of the magnet

B) always away from the south pole of the magnet

C) along the line joining the point to the neutral point

C) along the line joining the point to the neutral point

D) in the direction the north pole of a compass needle would point

D) in the direction the north pole of a compass needle would point

#13. When two parallel wires carry currents in opposite directions, the force on either wire is

A) away from the other wire

A) away from the other wire

B) zero, because the currents cancel each other

B) zero, because the currents cancel each other

C) twice as much as when the currents are in the same direction

C) twice as much as when the currents are in the same direction

D) towards the other wire

D) towards the other wire

#14. A pool of water appears to be 1.0m deep when viewed vertically from above. If the refractive index of water is 1.33, what is the actual depth of the pool?

A) 0.750m

A) 0.750m

B) 1.013m

B) 1.013m

C) 1.330m

C) 1.330m

D) 13.3000m

D) 13.3000m

#15. A ray of light is incident at an angle of 30o on one top surface of a parallel-sided glass block of refractive index 1.5. The ray finally emerges from the lower surface. What is the angular deviation of the emergent ray?

A) 60o

A) 60o

B) 39o

B) 39o

C) 28o

C) 28o

D) 0o

D) 0o

#16. Four lenses are being considered for use as a microscope objective. Which of the following focal lengths is most suitable?

A) -5mm

A) -5mm

B) +5mmcm

B) +5mmcm

C) -5cm

C) -5cm

D) +5cm

D) +5cm

#17. f the angle of declination in a place is 10oE, calculate the true geographic bearing if the compass reads N40oE

A) N50oE

A) N50oE

B) N40oE

B) N40oE

C) N30oE

C) N30oE

D) N25oE

D) N25oE

#18. The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 150Hz?

A) 1

A) 1

B) 2

B) 2

C) 3

C) 3

D) 4

D) 4

#19. Which of the following statements supports the assumption that light travels in straight lines?

A) light can be diffracted

A) light can be diffracted

B) a source of light produces distinct shadows of opaque objects

B) a source of light produces distinct shadows of opaque objects

C) a source of light produces interference patterns on a suitably placed screen

C) a source of light produces interference patterns on a suitably placed screen

D) light can be reflected

D) light can be reflected

#20. If an object is placed in front of two mirrors inclined at 90o, how many images will be formed?

A) five

A) five

B) four

B) four

C) three

C) three

D) two

D) two

#21. An object 3.0cm high is placed 60.0cm from a converging lens whose focal length is 20.0cm. Calculate the size of the image formed

A) 0.5cm

A) 0.5cm

B) 1.5cm

B) 1.5cm

C) 2.0cm

C) 2.0cm

D) 6.0cm

D) 6.0cm

#22. Which of the following phenomena explains the fact that a house whose roof is coated with white paint will be cooler in the hot season than one coated with black paint ?

A) conduction

A) conduction

B) convection

B) convection

C) refraction

C) refraction

D) reflection

D) reflection

#23. Calculate the amount of heat required to convert 2kg of ice at 2oC to water at 0oC. [specific heat capacity of ice = 2090Jkg-1oC-1, specific latent heat of fusion of ice = 333kJkg-1]

A) 666J

A) 666J

B) 8360J

B) 8360J

C) 666 000J

C) 666 000J

D) 674 360J

D) 674 360J

#24. A wave has a frequency of 2Hz and a wavelength of 30cm. The velocity of the wave is

A) 60.0ms-1

A) 60.0ms-1

B) 6.0ms-1

B) 6.0ms-1

C) 1.5ms-1

C) 1.5ms-1

D) 0.6ms-1

D) 0.6ms-1

#25. A boat at anchor is rocked by waves whose crest are 100m apart and whose velocity is 25ms-1. At what interval does the wave crest reach the boat?

A) 2500.00s

A) 2500.00s

B) 75.00s

B) 75.00s

C) 4.00s

C) 4.00s

D) 0.25s

D) 0.25s

#26. Which of the following instruments has a pure tone?

A) guitar

A) guitar

B) vibrating strings

B) vibrating strings

C) tuning fork

C) tuning fork

D) siren

D) siren

#27. As a result of air at the top of a barometer, the height of the mercury column is 73.5cm when it should be 75.0cm; the volume of the space above the mercury is 8.0cm3. Calculate the correct barometer height when the barometer reads 74.0cm and the volume of the space above the mercury is 6.0cm3.

A) 72.0cm

A) 72.0cm

B) 74.5cm

B) 74.5cm

C) 75.1cm

C) 75.1cm

D) 76.0cm

D) 76.0cm

#28. Hot water is added to three times its mass of water at 10oC and the resultant temperature is 20oC. What is the initial temperature of the hot water?

A) 100oC

A) 100oC

B) 80oC

B) 80oC

C) 50oC

C) 50oC

D) 40oC

D) 40oC

#29. 22,000J of heat is required to raise the temperature of 1.5kg of paraffin from 20oC to 30oC. Calculate the specific heat capacity of paraffin.

A) 1466Jkg-1oC-1

A) 1466Jkg-1oC-1

B) 2933Jkg-1oC-1

B) 2933Jkg-1oC-1

C) 4400Jkg-1oC-1

C) 4400Jkg-1oC-1

D) 5866Jkg-1oC-1

D) 5866Jkg-1oC-1

#30. In which of the following are the substance arranged in descending order of their thermal conductivities?

A) copper, steel, glass

A) copper, steel, glass

B) steel, copper, glass

B) steel, copper, glass

C) steel, glass, copper

C) steel, glass, copper

D) copper, glass, steel

D) copper, glass, steel

#31. The vacuum in a thermos flask helps to reduce heat transfer by?

A) convection and radiation

A) convection and radiation

B) convection and conduction

B) convection and conduction

C) conduction and radiation

C) conduction and radiation

D) radiation only

D) radiation only

#32. The mechanical advantage (MA) of an inclined plane depends on

A) its length

A) its length

B) its height

B) its height

C) the product of its length and height

C) the product of its length and height

D) the ratio of its length to its height

D) the ratio of its length to its height

#33. A load of 5N gives an extension of 0.56cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20N?

A) 1.12cm

A) 1.12cm

B) 2.14cm

B) 2.14cm

C) 2.24cm

C) 2.24cm

D) 2.52cm

D) 2.52cm

#34. A cube of side 10cm and mass 0.5kg floats in a liquid with only of its height above the liquid surface. What is the relative density of the liquid?

A) 0.125cm-1

A) 0.125cm-1

B) 0.250gcm-1

B) 0.250gcm-1

C) 0.625cm-1

C) 0.625cm-1

D) 2.500cm-1

D) 2.500cm-1

#35. The distance between the fixed points of a centigrade thermometer is 20cm. What is the temperature when the mercury level is 4.5cm above the lower mark?

A) 22.5oC

A) 22.5oC

B) 29.0oC

B) 29.0oC

C) 90.0oC

C) 90.0oC

D) 100.0oC

D) 100.0oC

#36. The length of a side of a metallic cube at 20oC is 5.0cm. Given that the linear expansivity of the metal is 4.0 x 10-5k-1, find the volume of the cube at 120oC .

A) 126.50cm3

A) 126.50cm3

B) 126.25cm3

B) 126.25cm3

C) 126.00cm3

C) 126.00cm3

D) 125.00cm3

D) 125.00cm3

#37. An elevator of mass 4800kg is supported by a cable which can safely withstand a maximum tension of 60 000N. The maximum upward acceleration the elevator can have is

A) 2.5ms-2

A) 2.5ms-2

B) 5.0ms-2

B) 5.0ms-2

C) 7.5ms-2

C) 7.5ms-2

D) 10.0ms-2

D) 10.0ms-2

#38. A constant force of 40N acting on a body initially at rest gives an acceleration of 0.1ms-2 for 4s. Calculate the work done by the force

A) 8J

A) 8J

B) 10J

B) 10J

C) 32J

C) 32J

D) 160J

D) 160J

#39. A body rolls down a slope from a height of 100m. its velocity at the foot of the slope is 20ms-1. What percentage of its initial potential energy is converted into kinetic energy? [g = 10ms-1]

A) 40%

A) 40%

B) 35%

B) 35%

C) 20%

C) 20%

D) 15%

D) 15%

#40. The coefficient of static friction between a 40kg crate and concrete surface is 0.25. Find the magnitude of the minimum force needed to keep the crate stationary on the concrete base inclined at 45o to the horizontal. [G = 10ms-1]

A) 400N

A) 400N

B) 300N

B) 300N

C) 283N

C) 283N

D) 212N

D) 212N

#41. If a beaker is filled with water it is observed that the surface of the water is not horizontal at the glass-water interface. This behavior is due to

A) friction

A) friction

B) viscosity

B) viscosity

C) surface tension

C) surface tension

D) evaporation

D) evaporation

#42. Which of the following units is equivalent to kgms-1?

A) Ns-1

A) Ns-1

B) Nms-1

B) Nms-1

C) Ns

C) Ns

D) Js-1

D) Js-1

#43. A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms-1. What is the mass of the material ejected per second?

A) 81.00kg

A) 81.00kg

B) 9.00kg

B) 9.00kg

C) 0.90kg

C) 0.90kg

D) 0.09kg

D) 0.09kg

#44. A man walks 8km north and then 5km in a direction 60o east of north. Find the distance from his starting point

A) 11.36km

A) 11.36km

B) 12.36km

B) 12.36km

C) 13.00km

C) 13.00km

D) 14.36km

D) 14.36km

#45. A man walks 8km north and then 5km in a direction 60^o east of north. Find the distance from his starting point

A) 11.36km

A) 11.36km

B) 12.36km

B) 12.36km

C) 13.00km

C) 13.00km

D) 14.36km

D) 14.36km

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