Physics Past Questions v50 for (JAMB/WAEC/NECO)

Physics Past Questions v50 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 v50 For (JAMB/WAEC/NECO)

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#1. Four co-planar forces of magnitudes 10N, 17N, 6N and 20N act at point O as shown in the above diagram. Determine the magnitude of the resultant force

A) 53.N

A) 53.N

B) 21.0N

B) 21.0N

C) 7.0N

C) 7.0N

D) 5.0N

D) 5.0N

#2. The outlet of a bicycle pump is used to inflate a football as illustrated in the diagram above. Why does the pressure of the air inside the pump increases as the pimp handle is slowly pushed downward at constant temperature?

A) momentum of the air molecules are increased

A) momentum of the air molecules are increased

B) volume occupied by the molecules are increased

B) volume occupied by the molecules are increased

C) frequency of collision of the air molecules with the walls of the pump is increased

C) frequency of collision of the air molecules with the walls of the pump is increased

D) more air molecules are collidin with one another in the system

D) more air molecules are collidin with one another in the system

#3. The diagram above illustrates a waveform. Which of the point on the waveform are in phase?

A) P and R

A) P and R

B) R and T

B) R and T

C) P and T

C) P and T

D) Q and S

D) Q and S

#4. The work function of a metal is 2.56 x 10-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10-19J, h = 6.6 x 10-34Js]

A) 5.56 x 1019Hz

A) 5.56 x 1019Hz

B) 1.66 x 1019Hz

B) 1.66 x 1019Hz

C) 1.12 x 1015Hz

C) 1.12 x 1015Hz

D) 8.42 x 1014Hz

D) 8.42 x 1014Hz

#5. The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called

A) critical energy

A) critical energy

B) ionization energy

B) ionization energy

C) work function

C) work function

D) planck's constant

D) planck's constant

#6. Which of the following particles are termed nucleons in a neutral atom?

A) protons and neutrons

A) protons and neutrons

B) neutrons and electrons

B) neutrons and electrons

C) protons and electrons

C) protons and electrons

D) protons, electrons and neutrons

D) protons, electrons and neutrons

#7. Which of the following statements about the use of radioisotopes is not correct? They are used to

A) induce mutations in plants and animals to obtain new and improved varieties

A) induce mutations in plants and animals to obtain new and improved varieties

B) trace the paths of metabolic processes in plants and animals

B) trace the paths of metabolic processes in plants and animals

C) estmate the age of rocks

C) estmate the age of rocks

D) locate broken bones

D) locate broken bones

#8. a charge of 2.0 x 10-5C experiences a force of 80N in a uniform electric field. Calculate the magnitude of the electric field intensity

A) 8.0 x 106 NC-1

A) 8.0 x 106 NC-1

B) 4.0 x 106 NC-1

B) 4.0 x 106 NC-1

C) 4.0 x 104 NC-1

C) 4.0 x 104 NC-1

D) 2.0 x 104 NC-1

D) 2.0 x 104 NC-1

#9. A potential difference of 12V is applied across the ends of a 6 omega resistor for 10 minutes. Determine the quantity of heat generated

A) 720J

A) 720J

B) 1200J

B) 1200J

C) 14400J

C) 14400J

D) 43200J

D) 43200J

#10. Which of the following instruments is used to determine the accurate value of the electromotive force of a cell?

A) voltmeter

A) voltmeter

B) meterbridge

B) meterbridge

C) voltameter

C) voltameter

D) potentiometer

D) potentiometer

#11. The capacitance of parallel plates capacitors varies

A) inversely as the square of the distance between the plates

A) inversely as the square of the distance between the plates

B) directly as the square of the distance between the plates

B) directly as the square of the distance between the plates

C) inversely as the distance between the plates

C) inversely as the distance between the plates

D) directly as the distance between the plate

D) directly as the distance between the plate

#12. Which of the following devices does not makes use of eddy current for its action? A/An

A) galvanometer

A) galvanometer

B) speedometer

B) speedometer

C) induction furnace

C) induction furnace

D) speedometer

D) speedometer

#13. Which of the following statements about the Galilean telescope is not correct?

A) the final image is inverted

A) the final image is inverted

B) it is shorter than terrestial telescope

B) it is shorter than terrestial telescope

C) the final image is erect

C) the final image is erect

D) it has a small field of view

D) it has a small field of view

#14. Which of the following radiations has it's frequency lower than that of infrared radiation?

A) Utra-violet rays

A) Utra-violet rays

B) gamma rays

B) gamma rays

C) x-rays

C) x-rays

D) radio waves

D) radio waves

#15. a string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled

A) 14Hz

A) 14Hz

B) 18Hz

B) 18Hz

C) 28Hz

C) 28Hz

D) 56Hz

D) 56Hz

#16. Which of the following statements about waves in pipes is correct?

A) for open pipes, there is only one end correction to be accounted for

A) for open pipes, there is only one end correction to be accounted for

B) for closed pipes, there are two end corrections to be accounted for

B) for closed pipes, there are two end corrections to be accounted for

C) only odd harmonics are possible in closed pipes

C) only odd harmonics are possible in closed pipes

D) all harmonics are possible in closed pipes

D) all harmonics are possible in closed pipes

#17. When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?

A) negative charges flows to the ground through the person's body

A) negative charges flows to the ground through the person's body

B) positive charges flow from the ground through his body to neutralize the negative charges

B) positive charges flow from the ground through his body to neutralize the negative charges

C) positive charges in the air neutralizes the negative charges the person is holding

C) positive charges in the air neutralizes the negative charges the person is holding

D) negative charges will leak through the air

D) negative charges will leak through the air

#18. At which position should an object be placed in front of a concave mirror in order to obtain an image which is of the same size as the object?

A) at the centre of curvature

A) at the centre of curvature

B) at the principal focus

B) at the principal focus

C) between the pole and principal focus

C) between the pole and principal focus

D) between the centre of curvature and principal focus

D) between the centre of curvature and principal focus

#19. The refractive index of a material is 1.5. Calculate the critical angle at the glass-air interface

A) 19o

A) 19o

B) 21o

B) 21o

C) 39o

C) 39o

D) 42o

D) 42o

#20. A diverging lens of focal length 30cm produces an image 20cm from the lens. Determine the object distance

A) 10cm

A) 10cm

B) 12cm

B) 12cm

C) 50cm

C) 50cm

D) 60cm

D) 60cm

#21. Highly polished silvery surfaces are

A) poor absorbers and poor emitters of radiation

A) poor absorbers and poor emitters of radiation

B) poor absorbers and good emitters of radiation

B) poor absorbers and good emitters of radiation

C) good absorbers and poor emitters of radiation

C) good absorbers and poor emitters of radiation

D) good absorbers and good emitters of radiation

D) good absorbers and good emitters of radiation

#22. The volume of a given mass of gas at 27oC and 800 mmHg is 76cm2. Calculate its volume at s.t.p

A) 100.0 cm3

A) 100.0 cm3

B) 72.8 cm3

B) 72.8 cm3

C) 60.0 cm3

C) 60.0 cm3

D) 36.4 cm3

D) 36.4 cm3

#23. Ice of mass 10g at 5oC was completely converted to water at 0oC, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg-1K-1, specific latent heat of fusion of ice = 336 Jg-1]

A) 105J

A) 105J

B) 3255J

B) 3255J

C) 3265J

C) 3265J

D) 16821J

D) 16821J

#24. An electric heater has a resistance of 50 omega. When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings

A) 400J

A) 400J

B) 1600J

B) 1600J

C) 24000J

C) 24000J

D) 96000J

D) 96000J

#25. When salt is dissolved in water, the freezing point of the water

A) increases

A) increases

B) decreases

B) decreases

C) remains the same

C) remains the same

D) increases and later decrease

D) increases and later decrease

#26. From Newton's first law of motion,

A) a body can only undergo translational motion

A) a body can only undergo translational motion

B) once a body remains at rest no force acts on it

B) once a body remains at rest no force acts on it

C) the net force acting in uniform linear motion is zero

C) the net force acting in uniform linear motion is zero

D) a body's inertia is its weight

D) a body's inertia is its weight

#27. The velocity ratio of an inclined plane

A) increases with increase in the angle of inclination

A) increases with increase in the angle of inclination

B) increases with decrease in the angle of inclination

B) increases with decrease in the angle of inclination

C) decreases with decrease in the angle of inclination

C) decreases with decrease in the angle of inclination

D) is independent of the angle of inclination

D) is independent of the angle of inclination

#28. Which of the following types of thermometer is used for the calibration of other thermometers?

A) liqud-in-glass thermometer

A) liqud-in-glass thermometer

B) constant volume gas thermometer

B) constant volume gas thermometer

C) optical pyrometer

C) optical pyrometer

D) thermocouple

D) thermocouple

#29. A body of mass 2kg is released from rest on a plane inclined at an angle of 60o to the horizontal. Calculate the acceleration of the body down the plane.[g = 10ms-2]

A) 3.1ms-2

A) 3.1ms-2

B) 5.2ms-2

B) 5.2ms-2

C) 6.0ms-2

C) 6.0ms-2

D) 8.7ms-2

D) 8.7ms-2

#30. The total area under a force-velocity graph represents

A) energy

A) energy

B) momentum

B) momentum

C) power

C) power

D) pressure

D) pressure

#31. A body of mass 20g projected vertically upwards in vacuum returns to the point of projection after 1.2s. [g = 10ms-2]. Calculate the speed of projection

A) 1.2ms-1

A) 1.2ms-1

B) 6.0ms-1

B) 6.0ms-1

C) 12.0ms-1

C) 12.0ms-1

D) 0.6ms-1

D) 0.6ms-1

#32. The rising of a liquid in an open and ended glass tube of narrow bore is

A) osmosis

A) osmosis

B) adhesion

B) adhesion

C) capillarity

C) capillarity

D) surface tension

D) surface tension

#33. Which of the following units is equivalent to the watt?

A) kgms-2

A) kgms-2

B) kgms-2s-2

B) kgms-2s-2

C) kgms2s-2

C) kgms2s-2

D) kgms2s-1

D) kgms2s-1

#34. Which of the following statements about pressure in a liquid is correct?

A) the pressure in a liquid increases with depth

A) the pressure in a liquid increases with depth

B) the higher the density of a liquid, the lower the pressure it exerts

B) the higher the density of a liquid, the lower the pressure it exerts

C) pressure in liquid act only in a direction perpendicular to the sides of the containing vessel

C) pressure in liquid act only in a direction perpendicular to the sides of the containing vessel

D) pressure is independent of the acceleration due to gravity

D) pressure is independent of the acceleration due to gravity

#35. Solid friction, like viscosity is

A) independent of the surface area in contact

A) independent of the surface area in contact

B) independent of the relative motion between layers

B) independent of the relative motion between layers

C) dependent on normal reaction

C) dependent on normal reaction

D) in opposition to motion

D) in opposition to motion

#36. The slope of a linear distance-times graph represents

A) acceleration

A) acceleration

B) displacement

B) displacement

C) speed

C) speed

D) velocity

D) velocity

#37. The force experienced by a current-carrying conductor move in a magnetic field is employed in the working of the i. moving coil ammeter ii. electric bell iii. electric motor. Which of the statements above are correct?

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) i, ii and iii

D) i, ii and iii

#38. Images formed by a convex mirror are always

A) inverted, real and diminished

A) inverted, real and diminished

B) inverted, virtual and diminished

B) inverted, virtual and diminished

C) erect, virtual and diminished

C) erect, virtual and diminished

D) erect, real and magnified

D) erect, real and magnified

E) erect, virtual and magnified

E) erect, virtual and magnified

#39. In a wave the maximum displacement of particles from their equilibrium positions is called.

A) frequency

A) frequency

B) amplitude

B) amplitude

C) period

C) period

D) wavelength

D) wavelength

E) wave velocity

E) wave velocity

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