Physics Past Questions v46 for (JAMB/WAEC/NECO)

Physics Past Questions v46 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 v46 For (JAMB/WAEC/NECO)

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#1. A uniform metre rule is balanced on a fulcrum placed at the 35cm mark by suspending a mass of 120g at the 10cm mark. Calculate the mass of the metre rule.

A) 60g

A) 60g

B) 80g

B) 80g

C) 120g

C) 120g

D) 200g

D) 200g

#2. Nuclear fusion is not used as a source of enegy because

A) very high temperature is needed for the reaction

A) very high temperature is needed for the reaction

B) the fuel for the reaction is not easy to obtain

B) the fuel for the reaction is not easy to obtain

C) less energy is released

C) less energy is released

D) the reaction is too slow

D) the reaction is too slow

#3. Which of the following practices will lead to losses in electrical power transmission?

A) using transmission cables of large diameter

A) using transmission cables of large diameter

B) transmitting at high voltage and low current

B) transmitting at high voltage and low current

C) transmitting at relatively low voltage and high current

C) transmitting at relatively low voltage and high current

D) using a set-up transformer at the production end

D) using a set-up transformer at the production end

#4. For photoelectric emission, the threshold frequency is the

A) maximum frequency of incident radiation that will eject elecrons

A) maximum frequency of incident radiation that will eject elecrons

B) minimum fraquency of incident radiation required to eject elecrons

B) minimum fraquency of incident radiation required to eject elecrons

C) frequency which results in the emission of the greater number of electrons

C) frequency which results in the emission of the greater number of electrons

D) fraquency whch impacts greatest kinetic energy to emitte electrons

D) fraquency whch impacts greatest kinetic energy to emitte electrons

#5. Which of the following properties is not applicable to X-rays? They

A) travel in straight lines

A) travel in straight lines

B) travel with the speed of light

B) travel with the speed of light

C) are deflected by magnetic field

C) are deflected by magnetic field

D) affect photographic films

D) affect photographic films

#6. Uranium-234 disintegrated to form Thorium-230 by emitting

A) alpha particles

A) alpha particles

B) gamma rays

B) gamma rays

C) beta negative rays

C) beta negative rays

D) beta positive rays

D) beta positive rays

#7. The change in mass of fuel during a nuclear reaction is 2.0 x 10-27 kg. Calculate the amount of energy released. (Speed of light = 2.0 x 108ms-1)

A) 1.8 x 10-10J

A) 1.8 x 10-10J

B) 9.0 x 10-11J

B) 9.0 x 10-11J

C) 6.0 x 10-19J

C) 6.0 x 10-19J

D) 1.2 x 10-45J

D) 1.2 x 10-45J

#8. Which of the following substances does not conduct electricity?

A) graphite

A) graphite

B) glass

B) glass

C) sulphuric acid

C) sulphuric acid

D) table salt solution

D) table salt solution

#9. The unit of capacitance is

A) farad

A) farad

B) coulomb

B) coulomb

C) henry

C) henry

D) ohms

D) ohms

#10. A wire of length 30cm is moved with a speed of 2ms-1 at right angles to a magnetic field of flux density 0.4T. calculate the emf induced in the wire

A) 0.15V

A) 0.15V

B) 0.24V

B) 0.24V

C) 2.70V

C) 2.70V

D) 24.00V

D) 24.00V

#11. The main difference between echo and reverberation is that

A) reverberation is reflected sound while echo is refracted sound

A) reverberation is reflected sound while echo is refracted sound

B) the time interval between incident sound and reflecte sound is shorter for reverbration

B) the time interval between incident sound and reflecte sound is shorter for reverbration

C) the amplitude of an echo is greater

C) the amplitude of an echo is greater

D) reverberation is from acoustic speakers while echo comes from clifts

D) reverberation is from acoustic speakers while echo comes from clifts

#12. Which of the following statements about the electromagnetic waves is correct?

A) radio waves have longer frequencies than x-rays

A) radio waves have longer frequencies than x-rays

B) x-rays have the longest wavelength

B) x-rays have the longest wavelength

C) some of the waves travel at 3.0 x 108ms-1

C) some of the waves travel at 3.0 x 108ms-1

D) white light occupies a region beyond ultraviolet rays

D) white light occupies a region beyond ultraviolet rays

#13. The capacitance of a parallel-plate capacitor

A) decreases when the seperation between the plate decreases

A) decreases when the seperation between the plate decreases

B) increases when the optential difference between the plates is increased

B) increases when the optential difference between the plates is increased

C) is greater without a dielectric material between the plates than with a dielectric

C) is greater without a dielectric material between the plates than with a dielectric

D) is greater with a dielectric between the plates than without a dielectric.

D) is greater with a dielectric between the plates than without a dielectric.

#14. When the pointed end of an uncharged optical pin is brought near the cap cf a positively charged electroscope, it is observed that the gold

A) collapse slowly

A) collapse slowly

B) vibrate

B) vibrate

C) are not affected

C) are not affected

D) diverge rapidly

D) diverge rapidly

#15. An object is placed 20.0cm in front of a converging lens of focal length 15.0cm. Calculate its image distance

A) 1.3cm

A) 1.3cm

B) 8.6cm

B) 8.6cm

C) 35.0cm

C) 35.0cm

D) 60.0cm

D) 60.0cm

#16. Presbyopia is a defect of the eye resulting from

A) weak ciliary muscles

A) weak ciliary muscles

B) short eyeball

B) short eyeball

C) loss of sphericity of the lens

C) loss of sphericity of the lens

D) long eyeball

D) long eyeball

#17. Two sound waves have frequencies of 12Hz and 10Hz. Calculate their beats period

A) 0.5s

A) 0.5s

B) 1.0s

B) 1.0s

C) 1.2s

C) 1.2s

D) 2.0s

D) 2.0s

#18. Ether produces a cooling effect when it is poured on the hand because it has

A) low conductivity

A) low conductivity

B) high conductivity

B) high conductivity

C) high latent heat of vaporization

C) high latent heat of vaporization

D) low latent heat of vaporization

D) low latent heat of vaporization

#19. Which of the following statements about the image formed by a plane mirror is not correct?

A) it is laterally inverted

A) it is laterally inverted

B) it has unit magnifiation

B) it has unit magnifiation

C) it is formed by actual intersection of rays

C) it is formed by actual intersection of rays

D) its distance from the mirror is equal to that of the object from the mirror

D) its distance from the mirror is equal to that of the object from the mirror

#20. The image formed by a convex mirror is always

A) real, erect and diminished

A) real, erect and diminished

B) real, inverted and diminished

B) real, inverted and diminished

C) virtual, inverted and diminished

C) virtual, inverted and diminished

D) virtual, erect and diminshed

D) virtual, erect and diminshed

#21. A ray undergoes a minimum deviation at 40o when it is incident on equilateral triangular glass prism. Calculate the refractive index of the prism

A) 1.48

A) 1.48

B) 1.50

B) 1.50

C) 1.53

C) 1.53

D) 1.67

D) 1.67

#22. Total internal reflection occurs in an optical prism when light rays

A) travel from the prism into an optically denser medium

A) travel from the prism into an optically denser medium

B) are incident in the prism at an angle greater than the critical angle

B) are incident in the prism at an angle greater than the critical angle

C) are incident normally in the prism

C) are incident normally in the prism

D) travel from the prism to the air

D) travel from the prism to the air

#23. Which of the following statements about anomalous expansion of water are correct? i. There is contraction between 0oC and 4oC. ii. There is expansion between 0oC and 100oC. iii. The volume is minimum at 4oC. iv. The volume is maximum at 4oC

A) i and ii only

A) i and ii only

B) ii and iii only

B) ii and iii only

C) i and iii only

C) i and iii only

D) ii and iv only

D) ii and iv only

#24. Which of the following assumptions is not valid for an ideal gas ?

A) molecules of a particular gas are identical

A) molecules of a particular gas are identical

B) molecules moves freely throughout the volume of the container

B) molecules moves freely throughout the volume of the container

C) force of attraction between molecules is negligible

C) force of attraction between molecules is negligible

D) molecules move at constant speed between collisions

D) molecules move at constant speed between collisions

#25. A body is pulled over a distance of 500m by a force of 20N. If the power developed is o.4 kW, calculate the time interval during which the force is applied

A) 0.2s

A) 0.2s

B) 2.5s

B) 2.5s

C) 25.0s

C) 25.0s

D) 250.0s

D) 250.0s

#26. A metal of mass 200g at a temperature of 100oC is placed in 100g of water at 25oC in a container of negligible heat capacity. If the final steady temperature is 30oC, calculate the specific heat capacity of the metal. [specific heat capacity of the water is 4200 Jkg-1 K-1]

A) 150 Jkg-1K-1

A) 150 Jkg-1K-1

B) 300 Jkg-1K-1

B) 300 Jkg-1K-1

C) 320 Jkg-1K-1

C) 320 Jkg-1K-1

D) 1960 Jkg-1K-1

D) 1960 Jkg-1K-1

#27. An object of mass 5.0 kg moves with a velocity of 10ms-1. Calculate its momentum.

A) 50.0 kgms-1

A) 50.0 kgms-1

B) 15.0 kgms-1

B) 15.0 kgms-1

C) 2.0 kgms-1

C) 2.0 kgms-1

D) 0.5 kgms-1

D) 0.5 kgms-1

#28. A coin is pushed from the edge of a laboratory bench with a horizontal velocity of 15.0 ms-1. If the height of the bench from the floor is 1.5m, calculate the distance from the foot of the bench to the point of impact with the floor [g = 10ms-2]

A) 0.75m

A) 0.75m

B) 2.25m

B) 2.25m

C) 8.22m

C) 8.22m

D) 15.00m

D) 15.00m

#29. The radius of a wheel is 30.0 cm and that of its axle is 6.0cm. Calculate the effort required to lift a load of 120.0N using this machine. Assuming 100% efficiency

A) 600.0N

A) 600.0N

B) 40.0N

B) 40.0N

C) 24.0N

C) 24.0N

D) 20.0N

D) 20.0N

#30. A hypsometer is used for determining

A) steam point

A) steam point

B) relative humidity

B) relative humidity

C) ice point

C) ice point

D) relative density

D) relative density

#31. In the absence of gravitational force, the weight of the body is

A) its mass

A) its mass

B) zero

B) zero

C) its density

C) its density

D) its volume

D) its volume

#32. Which of the following propeties is not considered in choosing mercury as a thermomemetric liquid?

A) density

A) density

B) expansivity

B) expansivity

C) conductivity

C) conductivity

D) opacity

D) opacity

#33. A stone of mass 300g is released from rest from the top of a bulding of height 100m. Determine the kinetic energy gained by the stone when it is a quarter way down from the point of release.[g = 10 ms-2]

A) 750.0J

A) 750.0J

B) 225.0J

B) 225.0J

C) 75.0J

C) 75.0J

D) 22.5J

D) 22.5J

#34. Two simple pendulum A and B of equal lengths and of masses 5g and 20g respectively are located in the same environment. The periods TA and TB of their respective oscillations are related by the equations

A) TA = 4TB

A) TA = 4TB

B) TA = 1/4

B) TA = 1/4

C) TA = TB

C) TA = TB

D) TA = 5TB

D) TA = 5TB

#35. A metal rod of density 7000 kgm-3 and cross-sectional area of 0.001257m2 has a mass of 1.76kg. Calculate its length.

A) 0.20m

A) 0.20m

B) 0.25m

B) 0.25m

C) 0.40m

C) 0.40m

D) 0.50m

D) 0.50m

#36. The pressure in a liquid

A) is the same at all points in the liquid

A) is the same at all points in the liquid

B) decreases with depth

B) decreases with depth

C) is the same in all directions at a given point

C) is the same in all directions at a given point

D) is equal to the atmospheric pressure

D) is equal to the atmospheric pressure

#37. The property of a fluid that is used to determine its suitability as a lubricant is its

A) capillarity

A) capillarity

B) viscocity

B) viscocity

C) surface tension

C) surface tension

D) relative density

D) relative density

#38. The area under a velocity-time graph represents

A) final velocity attained

A) final velocity attained

B) distance covered

B) distance covered

C) acceleration

C) acceleration

D) workdone

D) workdone

#39. Which of the following statements correctly defines a simple machine? a device

A) that can provide electric current

A) that can provide electric current

B) which can only carry people from one place to another

B) which can only carry people from one place to another

C) with which work can be done easily

C) with which work can be done easily

D) which changes the state of rest or of uniform motion of an object along a straight ine

D) which changes the state of rest or of uniform motion of an object along a straight ine

#40. The capacitance of a parallel-plate capacitor is increased by making the area of the plates

A) small and their seperation large

A) small and their seperation large

B) large and their seperation small

B) large and their seperation small

C) and their seperation small

C) and their seperation small

D) and their seperation equal

D) and their seperation equal

#41. Which of the following statements is not correct?

A) A magnetic Held is a region where a magnetic force can be detected.

A) A magnetic Held is a region where a magnetic force can be detected.

B) Magnetic fields are scalar quantities.

B) Magnetic fields are scalar quantities.

C) The magnitude of the magnetic force experienced by a moving charge depends on the speed on the charge.

C) The magnitude of the magnetic force experienced by a moving charge depends on the speed on the charge.

D) the angle between the direction of the earth’s magnetic held and the horizontal is called the angle of dip.

D) the angle between the direction of the earth’s magnetic held and the horizontal is called the angle of dip.

E) Iron filings can be used to trace out the magnetic field around a bar magnet.

E) Iron filings can be used to trace out the magnetic field around a bar magnet.

#42. 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

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