Physics Past Questions v44 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 v44 For (JAMB/WAEC/NECO)

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#1. In a cathode ray tube, the function of the x-plates is to

A) deflect the electron beam horizontally

A) deflect the electron beam horizontally

B) deflect the electron beam vertically

B) deflect the electron beam vertically

C) reflect the electron beam

C) reflect the electron beam

D) generate sinusoid waves

D) generate sinusoid waves

#2. Neutrons are used to induce artificial radioactivity because they

A) are energetic

A) are energetic

B) have no charge

B) have no charge

C) have no mass

C) have no mass

D) are ionizing

D) are ionizing

#3. In order to prevent bar magnets from losing their strength, they are stored wih keepers such that the two bars are placed with

A) like poles facing each other and the keepers placed between them

A) like poles facing each other and the keepers placed between them

B) like poles facing each other and the keepers placed between them

B) like poles facing each other and the keepers placed between them

C) unlike poles facing each other and the keepers placed at their ends

C) unlike poles facing each other and the keepers placed at their ends

D) unlike poles facing each other and the keepers placed between them

D) unlike poles facing each other and the keepers placed between them

#4. The resonant frequency of an a.c circuit is 1000 kHz. If each of the capacitance and inductance in the circuit is reduced by 50%, and no other changes are made, the resonant frequency will become

A) 250kHz

A) 250kHz

B) 750kHz

B) 750kHz

C) 1000kHz

C) 1000kHz

D) 2000kHz

D) 2000kHz

#5. Eddy currents can be reduced by

A) using coil of high resistance

A) using coil of high resistance

B) winding the coil on a soft iron core

B) winding the coil on a soft iron core

C) creating holes in the metal plates

C) creating holes in the metal plates

D) using coil of low resistance

D) using coil of low resistance

#6. an electron moves with a speed of 2.0 x 106ms-1 in a straight line. Calculate the wave length of the electron wave. [mass of an electron = 9.1 x 10-31 kg][Planck's constant = 6.6 x 10-34Js]

A) 3.63 x 10-19m

A) 3.63 x 10-19m

B) 6.51 x 10-9m

B) 6.51 x 10-9m

C) 4.24 x 10-8m

C) 4.24 x 10-8m

D) 7.25 x 10-8m

D) 7.25 x 10-8m

#7. Determine the potential difference. V across the parallel resistors

A) 2.0V

A) 2.0V

B) 2.3V

B) 2.3V

C) 3.0V

C) 3.0V

D) 0.7V

D) 0.7V

#8. A galvanometer of internal resistance 50 omega and full scale deflection of 20 mA is converted into a voltmeter by connecting a resistor of resistance 1950 omega in series to it. Calculate the maximum voltage that can be read by the voltmeter

A) 20V

A) 20V

B) 30V

B) 30V

C) 38V

C) 38V

D) 40V

D) 40V

#9. In the wiring of houses, the fuse is connected to the wire coloured

A) blue

A) blue

B) brown

B) brown

C) yellow

C) yellow

D) yellow and green

D) yellow and green

#10. Which of the following factors will increase the sensitivity of moving coil meter?

A) strong spring

A) strong spring

B) low numbers of turns

B) low numbers of turns

C) small area of coil

C) small area of coil

D) soft iron core

D) soft iron core

#11. As the air column of length L in an air pipe decreases, the frequency of the sationary wave emitted

A) decreases

A) decreases

B) increases

B) increases

C) varies as L2

C) varies as L2

D) varies as

D) varies as

#12. Capacitors are used in the following devices, except

A) water pumping machines

A) water pumping machines

B) ceiling fans

B) ceiling fans

C) electric irons

C) electric irons

D) television sets

D) television sets

#13. Use the diagram above to calculate the current, I.

A) 0.60A

A) 0.60A

B) 0.97A

B) 0.97A

C) 1.03A

C) 1.03A

D) 5.00A

D) 5.00A

#14. When an object is placed at the principal focus of a concave mirror, the location of the image formed is

A) between principal focus and pole

A) between principal focus and pole

B) between principal focus and centre of curvature

B) between principal focus and centre of curvature

C) at infinity

C) at infinity

D) at centre of curvature

D) at centre of curvature

#15. A lens that is thinner at the middle and thicher at the edges is

A) diverging

A) diverging

B) converging

B) converging

C) plano-convex

C) plano-convex

D) converging meniscus

D) converging meniscus

#16. Which of the following electromagnetic wave has the longest wavelength?

A) radio-waves

A) radio-waves

B) gamma rays

B) gamma rays

C) infrared waves

C) infrared waves

D) ultraviolet rays

D) ultraviolet rays

#17. A solid of mass 0.5kg initially at 50oC melts at 60oC. Calculate the quantity of heat required to melt it completely. [specific heat capacity of the solid =2.0KJ kg-1K-1][Specific latent heat of fusion of solid =1.0 KJ kg-1]

A) 1500J

A) 1500J

B) 10000J

B) 10000J

C) 10500J

C) 10500J

D) 15000J

D) 15000J

#18. Dew point is not affected by

A) temperature

A) temperature

B) wind

B) wind

C) the amount of water vapour in the atmosphere

C) the amount of water vapour in the atmosphere

D) atmospheric pressure

D) atmospheric pressure

#19. A certain wave has a speed of 20ms-1. If the frequency of the wave is 0.25Hz, calculate the distance between successive crests of the wave

A) 5.0m

A) 5.0m

B) 40.0m

B) 40.0m

C) 50.0m

C) 50.0m

D) 80.0m

D) 80.0m

#20. The ability of a wave to spread around corners is called

A) polarisation

A) polarisation

B) dispersion

B) dispersion

C) diffraction

C) diffraction

D) reflection

D) reflection

#21. The following devices use plane mirrors in their operations, except

A) periscope

A) periscope

B) sextant

B) sextant

C) kaleidoscope

C) kaleidoscope

D) binoculars

D) binoculars

#22. In a thermos flask, heat loss by radiation is minimizes by the

A) silvered surfaces

A) silvered surfaces

B) vacuum within the doubled walls

B) vacuum within the doubled walls

C) plastic stopper

C) plastic stopper

D) cork support

D) cork support

#23. Specific heat capacity 36.4 Jkg-1 K-1 of a body means that when 26.4J of heat energy is supplied to a body of

A) mass 100kg the temperature rises by 1k

A) mass 100kg the temperature rises by 1k

B) mass 1kg, the temperature by 1000K

B) mass 1kg, the temperature by 1000K

C) mass 1kg, the temperature rises by 1kg

C) mass 1kg, the temperature rises by 1kg

D) mass 100kg, the temperature rises by 1000k

D) mass 100kg, the temperature rises by 1000k

#24. An electric drill rated 400W is used to drill a hole in copper of mass 400g in 20s. Calculate the rise in temperature if all the heat produced is absorbed by the copper. [specific heat capacity of copper = 400Jkg-1K-1]

A) 100oC

A) 100oC

B) 75oC

B) 75oC

C) 50oC

C) 50oC

D) 45oC

D) 45oC

#25. A moving body of mass 25.0kg undergoes a uniform retardation of 20.0ms-2. Calculate the magnitude of the retardating force

A) 1.25N

A) 1.25N

B) 8.00N

B) 8.00N

C) 45.00N

C) 45.00N

D) 500.00N

D) 500.00N

#26. a machine is said to be a third class lever when the

A) load is between the fulcrum and effort

A) load is between the fulcrum and effort

B) fulcrum is between the effort and the load

B) fulcrum is between the effort and the load

C) effort is between the fulcrum and load

C) effort is between the fulcrum and load

D) fulcrum is directly below the load

D) fulcrum is directly below the load

#27. A thermometer records 680 mmHg at steam point and 440 mmHg at ice point. The temperature it records at 380 mmHg is

A) -25oC

A) -25oC

B) -20oC

B) -20oC

C) 20oC

C) 20oC

D) 25oC

D) 25oC

#28. The advantages of the thermoelectric thermometer include the following characteristics except that it

A) can measure rapidly changing temperatures

A) can measure rapidly changing temperatures

B) can measure high and low temperature

B) can measure high and low temperature

C) can measure high and low temperature almost at a point

C) can measure high and low temperature almost at a point

D) is fairly sensitive

D) is fairly sensitive

#29. The average speed of an object is determined by dividing the sum of its initial and final speeds by two only when the acceleration is

A) changing

A) changing

B) uniform

B) uniform

C) increasing

C) increasing

D) decreasing

D) decreasing

#30. A body is projected horizonatlly from the top of a cliff 45m above the ground. if the body lands at a distance 30m from the foot of the cliff, calculate the speed of projection. [g = 10ms-2]

A) 10ms-1

A) 10ms-1

B) 15ms-1

B) 15ms-1

C) 20ms-1

C) 20ms-1

D) 30ms-1

D) 30ms-1

#31. Which of the following statements best describes a rigid body? A body which

A) is not equally deformed

A) is not equally deformed

B) when deformed regains it shape

B) when deformed regains it shape

C) is brittle

C) is brittle

D) when deformed remains deformed

D) when deformed remains deformed

#32. A vertical string, suspended from a fixed point and having a small mass attached to the free end is set into oscillations. Which of the following statements about the system are correct? i. The potential energy of the mass is a minimum at the middle of the swing ii. Its kinetic energy is a maximum at the middle of the swing iii. The sum of the potential and kinetic energies is constant throughout the swing

A) i,ii and iii

A) i,ii and iii

B) i and ii only

B) i and ii only

C) ii and iii only

C) ii and iii only

D) i and iii only

D) i and iii only

#33. What is the density of a fuel of relative density 0.72? [Density of water = 1000kg m-3]

A) 72 kgm-3

A) 72 kgm-3

B) 720 kgm-3

B) 720 kgm-3

C) 7200 kgm-3

C) 7200 kgm-3

D) 72000 kgm-3

D) 72000 kgm-3

#34. The types of motion which a cylindrical drum rolling down an inclined plane undergoes are

A) circular and translational

A) circular and translational

B) rotational and translational

B) rotational and translational

C) rotational and circular

C) rotational and circular

D) rectilinear and circular

D) rectilinear and circular

#35. Which of the following statements about static friction is correct? It

A) is independent of the nature of the surface in contact

A) is independent of the nature of the surface in contact

B) depends on the area of surface in contact

B) depends on the area of surface in contact

C) depends on the relative motion between the surface in contact

C) depends on the relative motion between the surface in contact

D) depends on the weight of the moving body

D) depends on the weight of the moving body

#36. Which of the following statements about moving particle is correct?

A) if the resultant force acting on the particle is zero, then it is in dynamic equillibrium

A) if the resultant force acting on the particle is zero, then it is in dynamic equillibrium

B) If the resultant force acting on the acting on the particle is greater than zero, then it is moving with a uniform velocity

B) If the resultant force acting on the acting on the particle is greater than zero, then it is moving with a uniform velocity

C) the rate of change of its momentum with time tales place in a direction opposite to that of its motion

C) the rate of change of its momentum with time tales place in a direction opposite to that of its motion

D) the particle falling freely covers equal distances in equal time interval

D) the particle falling freely covers equal distances in equal time interval

#37. Two cars X and Y travelling in opposite directions along the same high way at uniform velocities 110 kmh-1 and 90kmh-1 respectively pass each other at a certain point. The velocity of X relative to Y at the time they pass each other is

A) 200 kmh-1

A) 200 kmh-1

B) 100 kmh-1

B) 100 kmh-1

C) 40 kmh-1

C) 40 kmh-1

D) 20 kmh-1

D) 20 kmh-1

#38. Which of the following properties of a long steel bar would alter if the bar were melted, recast into a cube and allowed to cool to its original temperature?

A) sensity

A) sensity

B) volume

B) volume

C) specific heat capacity

C) specific heat capacity

D) electrical resistance

D) electrical resistance

#39. Which of the following instruments is best for measuring the diameter of a thin constantan wire?

A) callipers

A) callipers

B) metre rule

B) metre rule

C) micometer screw guage

C) micometer screw guage

D) vernier callipers

D) vernier callipers

#40. Which of the following statements about solid friction are correct? It i. is a force ii. occurs between the surfaces of two bodies in contact iii. depends on the area in contact

A) i and ii only

A) i and ii only

B) i adnd iii only

B) i adnd iii only

C) ii and iii only

C) ii and iii only

D) i, ii and iii

D) i, ii and iii

#41. A positively charged glass rod is placed by near the cap of a positively charge electroscope. The divergence of the leaf is observed to

A) decrease

A) decrease

B) increase

B) increase

C) remain the same

C) remain the same

D) increase and collapse immediately

D) increase and collapse immediately

#42. Which of the following factors does not affect the the electric resistance of a wire

A) length

A) length

B) mass

B) mass

C) temperature

C) temperature

D) cross sectional area

D) cross sectional area

#43. Two simple pendula x and y make 400 and 500 oscillations respectively in equal time. If the period of oscillation of x is 1.5 seconds, what is the period of oscillation of y?

A) 0.53s

A) 0.53s

B) 0.83s

B) 0.83s

C) 1.20s

C) 1.20s

D) 1.50s

D) 1.50s

E) 1.88s.

E) 1.88s.

#44. Which of the following statements is not true?

A) Musical notes consist of the combination of sounds of regular frequency

A) Musical notes consist of the combination of sounds of regular frequency

B) The combination of overtones produced by an instrument determines the quality of the sound

B) The combination of overtones produced by an instrument determines the quality of the sound

C) the loudness of sound is determined by its frequency

C) the loudness of sound is determined by its frequency

D) the pitch of a note depends on the frequency of vibration of the source

D) the pitch of a note depends on the frequency of vibration of the source

E) Noise can be produced by a combination of sounds of irregular frequency

E) Noise can be produced by a combination of sounds of irregular frequency

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