Physics Past Questions v16 for (JAMB/WAEC/NECO)

Physics Past Questions v16 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 v16 For (JAMB/WAEC/NECO)

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

A) The mechanical advantage of a smooth inclined plane depends on the ratio of the length to the height of the plane.

B) The efficiency of an inclined plane decreases as the slope increases.

C) The effort required to push a given load up an inclined plane increases as the slope increases.

D) As the slope of an inclined plane increases, the velocity ratio decreases.

#2. Which of the following will reduce the frequency of oscillation of a simple pendulum?

A) Decreasing the length of the string

B) Increasing the amplitude of oscillation

C) Increasing the length of the string

D) Increasing the mass of the bob

E) Reducing the mass of the bob.

#3. Which of the following conclusion(s) can be drawn from Newton’s second law of motion? Force is proportional toI. the product of mass and acceleration II. the product of mass and velocity III. Impulse

A) I only

B) II only

C) III only

D) II and III only

E) I, II and III

#4. Which of the following statement(s) is/are correct about the isotopes of an elements? They have the same I. chemical properties II. nucleon number III proton number

A) I only

B) II only

C) I and II only

D) I and III only

E) I,II and III

#5. A body is uniformly accelerated from rest. Which of the following quantities vary/varies linearly with the square of the time? I. Displacement II. Velocity III. Momentum

A) I only

B) II only

C) III only

D) I and II only

E) II and Ill only

#6. A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is nech statement is coar to it. The rod is then removed. Whirrect?

A) The cap will be positively charged and the will be negatively charged

B) The cap will be negatively charged and the leaf will be positively changed

C) The cap and the leaf will be positively charged

D) The cap and the leaf will be negatively charged

E) none

#7. When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eye piece is 5.0cm. What is the distance between the lenses?

A) 10.0cm

B) 30.0cm

C) 45.0cm

D) 55.0cm

E) 250.0cm

#8. Which of the following is/areNOT affected by a magnetic field? I. Alpha particle II. Cathode rays III. Neutrons

A) I only

B) II only

C) III only

D) I and II only

E) I,II & III

#9. The circuit diagram above contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct

A) The reading of W is equal to that of Y and twice that of X

B) The reading of Y is greater than that of Z

C) The readings of W and Y are equal and each is greater than that of X

D) The reading of Z is equal to the sum of the readings of Y and W

#10. The circuit diagram above contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct

A) The reading of W is equal to that of Y and twice that of X

B) The reading of Y is greater than that of Z

C) The readings of W and Y are equal and each is greater than that of X

D) The reading of Z is equal to the sum of the readings of Y and W

#11. A capacitor of 10µF is connected across a cell of 12 volts as shown above, calculate the energy stored in the capacitor

A) 7.2 x 10-4J

B) 1.4 x 10-3J

C) 1.4 x 10-3J

D) 1.2 x 10-2J

#12. PQRS is rectangular cell with PQ perpendicular to the magnetic field as shown above. If a current flows in the the direction PQRS in what direction will the coil move

A) Upwards

B) Downwards

C) TOwards The North Pole

D) Towards The South Pole

#13. A uniform light rod is kept in horizontal equilibrium under the influence of fore forces as shown above, which of the following equations correctly represents the condition of equilibrium for the rod

A) F1 + F2 = F3 + F4

B) F1 + F2 - F3 + F = 0

C) (F1 + F2)ab = (F3 + F4)cd

D) F1a + F2b - F3c - F4d = 0

#14. In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is

A) m1/m2

B) m1g/m2

C) m2/m1

D) m2g/m1

#15. The figure above shows the heights of two liquids X and Y when some air is sucked out of the apparatus through the pump P. The diameter of the table in X is twice That of the Tube In Y. What is the relative density of the liquid X with respect to liquid Y

A) 1/3

B) 2/3

C) 3

D) 6

#16. The diagram above represents the field pattern obtained by bringing the poles of two magnets together.The poles must be

A) S-S poles

B) S-N poles

C) N-S poles

D) N-N poles

#17. The diagram above shows a meter bridge in which two of thee arms contain resistances R and 2Ω. A balance point is obtained at 60cm from the left end , calculate the value of R

A) 1.2Ω

B) 1.3Ω

C) 3.0Ω

D) 6.0Ω

#18. Question 21 The heat produced in a conductor carrying an electric current is

A) inversely proportional to the current and the resistance

B) directly proportional to the current, resistance and the time

C) inversely proportional to of the resistance, current and the time

D) directly proportional to the square of the current, the resistance and the time

#19. In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to

A) volt, ampere and hertz

B) ohms, volt and hertz

C) watt, ohms and radian

D) ohms, hertz and joule

#20. The threshold of frequency for photoelectric effect depends on the

A) intensity of incident light

B) frquency of incident light

C) material of the photocathode

D) potential difference between the cathode and the anode

#21. When an ebolite rod is rubbed with fur, it has

A) no charge at all

B) a negative charge

C) a positive charge

D) negative and positive charges

#22. Which of the following factors has no effect on the e.m.f. of a primary cell?

A) temperature

B) size of the cell

C) nature of the plate

D) nature of the electrolyte

#23. Which of the following apparatus will require the smallest fuse rating for its protection?

A) 60W, 240V

B) 60W, 40V

C) 40W, 12V

D) 40W, 5V

#24. The speed of light in air is 3 x 108ms-1. What is the speed in glass with a refractive index of 1.50?

A) 1.5 x 108ms-1

B) 3.0 x 108ms-1

C) 2.0x 108ms-1

D) 6.0 x 108ms-1

#25. If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?

A) 30o

B) 42o

C) 45o

D) 50o

#26. Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?

A) Gamma rays, ultraviolet rays, X- rays, infra - red rays

B) Gamma rays, X-rays, ultraviolet rays, infra-red rays

C) infra-red rays, ultraviolet rays, X-rays, gamma rays

D) Gamma rays, ultraviolet rays, infra-red rays, X-rays

#27. The angle between the direction of the earth's magnetic field and the horizontal is called the

A) angle of deviation

B) magnetic declination

C) magnetic meridian

D) angle of dip

#28. Calculate the force acting on an electron of charge 1.6 x 10-19C placed in an electric field of intensity 108Vm-1

A) 1.6 x 10-11N

B) 1.6 x 10-14N

C) 1.6 x 10-16N

D) 1.0 x 10-16N

#29. What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?

A) 80Hz

B) 600Hz

C) 800Hz

D) 1600Hz

#30. Which of the following properties make the convex mirror useful as a driving mirror? i. the image is real. ii. the image is erect. iii. it has a wide field of view. iv. the image is magnified.

A) i, ii, and iv

B) i, ii, iii

C) ii and iii

D) i and iii

#31. When an object is placed very close to the pole of a concave mirror, the virtual image obtained is

A) diminished and upright

B) diminished and inverted

C) enlarged and inverted

D) enlarged and upright

#32. A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?

A) 12cm

B) 24cm

C) 48cm

D) 108cm

#33. Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?

A) He cannot see distant objects clearly

B) Rays of light from a close object are focused in front of his retina

C) His eye ball is too long

D) Parallel rays of light are focused behind his retina

#34. A block of ice floats on water inside a container. If the block of ice gets completely melted, the level of water in the container will

A) increase

B) remain the same

C) decrease

D) first decrease and then increase

#35. The space between the double glass walls of a thermos flask is evacuated space are silvered. The residual source of heat loss takes place by

A) convection

B) radiation from the surface

C) conduction through the stopper and the glass

D) conduction across the walls

#36. The equation of a wave is y = 0.005 sin[x(0.5X - 200t)] where x and y are in meters and t is in seconds. What is the velocity of the wave?

A) 4000ms-1

B) 400ms-1

C) 250ms-1

D) 40ms-1

#37. Which of the following characteristics of a wave is used in the measurement of the depth of the sea?

A) diffraction

B) interference

C) refraction

D) reflection

#38. A note is the octave of another note if it has

A) a frequency twice that of the first note

B) frequency half that of the first note

C) the same fundamental frequency as the first one

D) a frequency frequency eight times that of the first note

#39. A platinum resistance thermometer wire has a resistance of 5 ohms at 0oC and 5.5 ohms at 100oC. Calculate the temperature of the wire when the resistance is 5.2 ohms

A) 80oC

B) 60oC

C) 40oC

D) 10oC

#40. A bridge made of steel is 600m long. What is the daily variation in its length if the night-time and daytime temperatures are 10oC and 35oC respectively. The linear expansivity of steel is 0.000012C-1

A) 0.18cm

B) 1.80cm

C) 18.00cm

D) 1800cm

#41. One of the most important applications of bi-metallic strip is found in the construction of

A) a thermostat

B) an altimeter

C) a thermocouple

D) a hydrometer

#42. At constant pressure, the density of a fixed mass of gas is

A) constant with temperature

B) proportional to its volume

C) inversely proportional to its temperature

D) independent of its volume

#43. How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg-1K-1 is heated from 20oC to 70oC?

A) 39 . 98 x 10-1J

B) 9.75 x 102J

C) 3.98 x 103J

D) 9.75 x 103J

#44. A stone, Q is thrown with velocity U at an angle of 75o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15o to the horizontal. The ranges covered by the stones will be

A) greater for Q

B) greater for R

C) the same for Q and R

D) greater for the heavier of the two stones

#45. A man weight 800N climbs up a stairs to height of 15m in 12.5s. What is the man''s average power output?

A) 667W

B) 810W

C) 960W

D) 15000W

#46. A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the

A) 80%

B) 75%

C) 50%

D) 33%

#47. If a plastic sphere floats in water (density = 1000kgm3) with 0.5 of its volume submerged, and floats in oil with 0.4 of its volume submerged the density of the oil is

A) 800kgm3

B) 200kgm3

C) 1250kgm3

D) 2000kgm3

#48. What is the least possible error in using a rule graduated in centimeters?

A) 0.1cm

B) 0.5cm

C) 1.0cm

D) 2.0cm

#49. Which of the following affects the period of a simple pendulum? i. mass of the pendulum bob. ii. length of the pendulum. iii. acceleration due to gravity.

A) i, ii, and iii

B) ii and iii only

C) i and iii only

D) i and ii only

#50. A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall

A) in front of his palm

B) behind his palm

C) beside his palm

D) into his palm

#51. A body starts from rest and moves with uniform acceleration of 6ms-2. What distance does it cover in the third seconds

A) 15m

B) 18m

C) 27m

D) 30m

#52. Images formed by a convex mirror are always

A) magnified

B) behind the mirror

C) real

D) inverted

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

A) molecules of ice, water and water vapour have equal intermolecular distances

B) molecules of ice, water and water vapour do not differ in the structure of their molecules

C) molecules of water vapour attract each other with forces far less than the forces of attraction between water molecules

D) water is less compressible than water vapour

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

A) a magnetic field is a region in which a magnetic force will be detected

B) a magnetic line of force is a path along which a magnetic fields are scalar quantities it were free

C) magnetic fields are scalar quantities

D) neutral point are obtained where the earth's magnetic force is exactly equal and opposite to that due to a magnet

#55. Which of the following will reduce the frequency of oscillation of a simple pendulum?

A) Increasing the mass of the bob

B) Decreasing the mass of the bob

C) Increasing the length of the string

D) Decreasing the length of the string

E) Decreasing the amplitude of oscillation

#56. When the nucleus of a uranium atom is split into two fragments of nearly equal mass the sum of the masses of the fragments is less than the mass of the original nucleus. This difference is a measure of the

A) experimental error in calculating the separate masses

B) change of momentum of each fragment

C) potential energy lost

D) nuclear energy released

E) kinetic energy lost

#57. A sheet of paper is placed in the path of a beam of radiations from a radioactive source. Which of the following radiations will pass through the paper?I. Alpha rays II. Beta rays III. Gamma rays

A) I only

B) II only

C) III only

D) II and III only

E) I, II and III

#58. The process by which a metal, heated to high temperature, gives off electrons from its surface is known as

A) photoelectric emission

B) thermionic emission

C) radioactive emission

D) Held emission

E) secondary emission

#59. An electric string of length l is elastically stretched through a length e by a force F. The area of cross- section of the string is A and its Young’s modulus is E. Which of the following expressions is correct?

A) F = EA/eI

B) F = EAI/e

C) F = EAe/l

D) F = EAe

#60. lf the frequency of the a.c. circuit illustrated is 500Hz/ π what would be the reactance in the circuit?

A) 0.01Ω

B) 190.91 Ω

C) 200.00 Ω

D) 795.46 Ω

E) 1000.00Ω

#61. Which of the following statements is correct about cathode rays? They are fast moving

A) atoms

B) ions

C) neutrons

D) protons

E) electrons

#62. Which of the following gives rise to the line spectra obtained from atoms?

A) Kinetic energy of a moving atom

B) Potential energy of an electron inside an atom

C) Change of an electron from a higher to a lower energy level in the atom

D) Disturbed proton in the nucleus

E) Excitation of an electron in the atom

#63. A stream of alpha particles is projected into an electric field between two plates X and Y as shown in the diagram above. Which of the following is correct? The particles are

A) accelerated and they continue in a straight line

B) directionally reversed at the end of the plates

C) deflected towards plate Y

D) attracted by both plates

E) deflected towards plate X.

#64. An element whose half-life is 3 years has N atoms. How many atoms would have decayed after 9 years

A) 1 N atoms8

B) 1 N atoms3

C) 2 N atoms3

D) 5 N atoms6

E) 7 N atoms8

#65. Calculate the energy stored in 20μF capacitor if the potential difference between the plates is 40 V

A) 3.2 x10-2J

B) 1.6x102J

C) 8.0x10-4J

D) 4.0x10-4J

E) 2.0x10-4J

#66. What is the electric potential at a point distance r from a proton of charge q placed in a medium of permittivity εo?

A) q2/4πεor2

B) q/4πεor2

C) q2/4πεor

D) qr/4πεo

E) 4πεoq2r

#67. alculate the rate at which energy is used up in the circuit illustrated by the diagram

A) 0 W

B) 2 W

C) 4 W

D) 8 W

E) 16 W

#68. Calculate the length of a constantan wire of cross- sectional area 4 π x 10-8m2 and resistivity 1.1 x 10-6 Ω m required to construct a standard resistor of resistance 21 Ω. [Take π = 22/7]

A) 0.42m

B) 2.40 m

C) 6.25 m

D) 183.75 m

E) 590.00 m

#69. Calculate the time in which 4.8 kJ of energy would be expended when an electric heater of resistance 1.8 x 103Ω is used on a 240 V mains supply. (Neglect heat losses to the surrounding).

A) 150.0s

B) 90.0s

C) 36.0s

D) 20.0s

E) 2.7s.

#70. Which of the following waves are longitudinal waves? l. Ripples on the surface of water II. Waves produced by a tuning fork vibrating in air III. Light waves IV. Waves produced by a flute

A) I and II only

B) I and III only

C) II and III only

D) II and IV only

E) III and IV only

#71. Question 81 A pipe closed at one end is 1.0m long. The air in the pipe is set into vibration and a fundamental note of frequency 85Hz is produced. Calculate the velocity of sound in the air. (Neglect end correction).

A) 340.0ms-1

B) 33Oms-1

C) 170ms-1

D) 85.0ms-1

E) 42.5ms-1

#72. A negatively charged rod is brought near the cap of a gold-leaf electroscope. The cap is earthed momentarily while the rod is near to it. The rod is then removed. Which of the following is correct?

A) The cap will be positively charged and the negatively charged leaves will diverge

B) The cap will be negatively charged and the positively charged leaves will diverge

C) The cap and the leaves will be positively charged

D) The cap and the leaves will be negatively charged.

E) The leaves will not diverge because the cap has been earthed.

#73. The angle of deviation of light of various colours passing through a glass prism decreases in the order of

A) blue orange and red

B) red, blue and orange

C) blue, red and orange

D) red, orange and blue

E) orange, blue and red

#74. The diagram above shows a waveform in which energy is transferred from A to B in a time of 2.5 x 10-3s. Calculate the frequency of the wave

A) 2.0 x 103Hz

B) 1.0 x 103Hz

C) 4.0 x 10-2Hz

D) 1.0 x 10-3Hz

E) 5.0 x 104Hz.

#75. Which of the following radiations have the highest frequency?

A) Radio waves

B) Light waves

C) X-rays

D) infra-red rays

E) Ultraviolet rays

#76. How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 ms-1)

A) 36.67m

B) 74.25m

C) 148.50m

D) 297.00

E) 366.67mns

#77. As an object is moved close to the focus of a converging lens from infinity its image I. moves closer to the lens II. moves away from the lens. III. Remains the same size. IV becomes smaller. Which of the statements above is/are correct?

A) III and IV only

B) I and III only

C) IV only

D) III only

E) II only

#78. A real image of an object fom1ed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?

A) 30cm

B) 25cm

C) 20cm

D) 15cm

E) 10cm

#79. The eye defect illustrated in the diagram above can be corrected by a

A) convex mirror

B) concave mirror

C) diverging lens

D) converging lens

E) piano-converging lens

#80. When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.5om. What is the distance between the lenses?

A) 20.0cm

B) 47.5cm

C) 50.0cm

D) 52.5cm

E) 125.0cm.

#81. Which of the following is used for controlling the amount of light entering the eye?

A) Cornea

B) Pupil

C) Iris

D) Optic nerve

E) Ciliary muscle

#82. A ray of light strikes a plane mirror at an angle of incidence i. Determine in terms of i the angle of deviation of the ray after reflection from the mirror.

A) i

B) 2i

C) 90o-i

D) 90o+ i

E) 180o - 2i

#83. Which of the following statements is not correct for a light ray passing through a rectangular glass block which is surrounded by air? It

A) suffers a displacement at the point of emergence

B) emerges parallel to the incident ray

C) is partly reflected at the point of incidence

D) is deviated at the point of emergence

E) is reflected in the block

#84. In an experiment to measure1 the focal length f of a converging lens object distances u and corresponding image distance were measured and 1/u plotted against 1/v to obtain the graph illustrated. How would f be determined from this graph?

A) f= the slope of the graph

B) f= the intercept on the 1/u axis

C) f =the intercept on the 1/v axis

D) f = reciprocal of the slope

E) f = reciprocal of the intercept on either axes

#85. The image of a pin formed by a diverging lens of focal length 10cm is 5cm from the lens. Calculate the distance of the pin from the lens

A) -3.3cm

B) 3.3cm

C) 10.0cm

D) 15.0cm

E) 20.0cm

#86. A gas which obeys Charles’ law exactly has a volume of 283cm3 at 10oC. What is its volume at 30oC?

A) 142cm3

B) 293cm3

C) 303cm3

D) 566cm3

E) 849cm3

#87. A small circular membrane is 10cm below the surface of a pool of mercury when the barometric height is 76 cm of mercury. If the density of mercury is 13600kg-3, what is the pressure on the membrane in Nm-2? (g =10m2)

A) 1.17 x 107 Nm-2

B) 6.80 x 105Nm-2

C) 1.17x105Nm-2

D) 1.03 x 105Nm-2

E) 1.36 x104 Nm-2

#88. A metal of mass 1.5 kg was heated from 27oC to 47oC in 4 minutes by a boiling ring of 75 W rating. Calculate the specific heat capacity of the metal, (Neglect heat losses to the surrounding)

A) 2.5 X103J kg-10C-1

B) 6.0 X102J kg-10C-1

C) 2.5 x 102J kg-10C-1

D) 1.4 X102J kg-10C-1

E) 1.0 x 102J kg-10C-1

#89. A body of mass 5kg falls from a height of 10m above the ground. What is the kinetic energy of the body just before it strikes the ground? (Neglect energy losses and take gas 10ms2)

A) 5J

B) 25J

C) 250J

D) 500J

E) 625J

#90. Steel bars, each of length 3.0 m at 28°C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10-5°C, what is the safety gap that must be left between successive bars if the highest temperature expected is 40oC?

A) 1.2 x 10-1cm

B) 8.4 x 10-2cm

C) 7.2 x10-2cm

D) 3.6 x 10-2cm

E) 1.8 x 10-2cm

#91. Which of the following statements is/are correct? I. Pure water freezes at 0oC under normal pressure ll. Water has its highest density at 4oC. III. The volume at 4oC

A) I only

B) II only

C) I and II only

D) I and III only

E) II and III only

#92. A given mass of gas at a temperature of 30°C is trapped in a tube of volume V. Calculate the temperature of the gas when the volume is reduced to two-third of its original value by applying a pressure twice the original value.

A) 71oC

B) 40oC

C) 131oC

D) 313oC

E) 404oC

#93. Which of the following colours of surfaces will radiate heat energy best?

A) Red

B) White

C) Black

D) Yellow

E) Blue

#94. Which of the following has the same unit as the moment of a force?

A) Force

B) Power

C) Work

D) Momentum

E) Impulse

#95. Solid weighs 0.040 N in air and 0.024 N when fully immersed in a liquid of density 800 kg m-3. What is the volume of the solid? (g = 1Oms2)

A) 2.0 x 10-6m3

B) 2.5x10-6m3

C) 3.0x10-6m3

D) 2.0x 10-5m3

E) 3.0 x 10-5m3

#96. A force of 20 N applied parallel to the surface of a horizontal table, is just sufficient to make a block of mass 4kg move on the table. Calculate the coefficient of friction between the block and the table. (g = 10ms2)

A) 0.05

B) 0.20

C) 0.50

D) 0.80

E) 2.00

#97. A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew point. Which of the following is/are correct?

A) I, II and III

B) II and III only

C) I and III only

D) I and II only

E) III only

#98. Which of the following is a scalar quantity?

A) Momentum

B) Acceleration

C) Displacement

D) Distance

E) Force

#99. The diagram above represents the trajectory of a projectile with an initial velocity U. Calculate the time taken to reach the maximum height. (Take g as acceleration due to gravity)

A) Usinθ/2g

B) 2Usinθ/g

C) Ucosθ/g

D) 2Ucosθ/g

E) Usinθ/g

#100. What change in velocity would be produced on a body of mass 4kg if a constant force of 16 N acts on it for2 s?

A) 0.5 ms-1

B) 2.0ms-1

C) 8.0 ms-1

D) 32.0 ms-1

E) 128.0 ms-1

#101. Which of the following statements about solid friction is/are correct? I. Friction depends on the nature of the surfaces in contact II. Friction depends on the area of contact III. Friction always acts in the direction of motion.

A) I only

B) II only

C) III only

D) I and II only

E) I,II and III

#102. A body accelerates uniformly from rest at the rate of 3 ms-1 for 8 seconds. Calculate the distance covered by the body during the acceleration.

A) 12m

B) 24m

C) 48m

D) 72m

E) 96m

#103. The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called

A) refraction

B) reflection

C) diffraction

D) interference

E) dispersion

#104. Which of the following best explains a person suffers more severe burns when his skin is exposed to steam than when boiling water is poured onto his skin?

A) steam is at a higher temperature than boiling water

B) steam posses greater heat energy per unit-mass than boiling water

C) steam spreads more easily over a wider area of the skin than boiling water

D) steam panetrates more easily over a wider area of the skin than boiling water

E) the specific latent heat of vaporization is released in changing from boiling water to steam

Finish

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Physics Past Questions v16 for (JAMB/WAEC/NECO)

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Physics Past Questions v16 for (JAMB/WAEC/NECO)

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

#2. Which of the following will reduce the frequency of oscillation of a simple pendulum?

#3. Which of the following conclusion(s) can be drawn from Newton’s second law of motion? Force is proportional toI. the product of mass and acceleration II. the product of mass and velocity III. Impulse

#4. Which of the following statement(s) is/are correct about the isotopes of an elements? They have the same I. chemical properties II. nucleon number III proton number

#5. A body is uniformly accelerated from rest. Which of the following quantities vary/varies linearly with the square of the time? I. Displacement II. Velocity III. Momentum

#6. A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is nech statement is coar to it. The rod is then removed. Whirrect?

#7. When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eye piece is 5.0cm. What is the distance between the lenses?

#8. Which of the following is/areNOT affected by a magnetic field? I. Alpha particle II. Cathode rays III. Neutrons

#9. The circuit diagram above contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct

#10. The circuit diagram above contains four ammeters W, X, Y and Z, Which of the following statements about the ammeter readings is correct

#11. A capacitor of 10µF is connected across a cell of 12 volts as shown above, calculate the energy stored in the capacitor

#12. PQRS is rectangular cell with PQ perpendicular to the magnetic field as shown above. If a current flows in the the direction PQRS in what direction will the coil move

#13. A uniform light rod is kept in horizontal equilibrium under the influence of fore forces as shown above, which of the following equations correctly represents the condition of equilibrium for the rod

#14. In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is

#15. The figure above shows the heights of two liquids X and Y when some air is sucked out of the apparatus through the pump P. The diameter of the table in X is twice That of the Tube In Y. What is the relative density of the liquid X with respect to liquid Y

#16. The diagram above represents the field pattern obtained by bringing the poles of two magnets together.The poles must be

#17. The diagram above shows a meter bridge in which two of thee arms contain resistances R and 2Ω. A balance point is obtained at 60cm from the left end , calculate the value of R

#18. Question 21 The heat produced in a conductor carrying an electric current is

#19. In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to

#20. The threshold of frequency for photoelectric effect depends on the

#21. When an ebolite rod is rubbed with fur, it has

#22. Which of the following factors has no effect on the e.m.f. of a primary cell?

#23. Which of the following apparatus will require the smallest fuse rating for its protection?

#24. The speed of light in air is 3 x 108ms-1. What is the speed in glass with a refractive index of 1.50?

#25. If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?

#26. Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?

#27. The angle between the direction of the earth's magnetic field and the horizontal is called the

#28. Calculate the force acting on an electron of charge 1.6 x 10-19C placed in an electric field of intensity 108Vm-1

#29. What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?

#30. Which of the following properties make the convex mirror useful as a driving mirror? i. the image is real. ii. the image is erect. iii. it has a wide field of view. iv. the image is magnified.

#31. When an object is placed very close to the pole of a concave mirror, the virtual image obtained is

#32. A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?

#33. Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?

#34. A block of ice floats on water inside a container. If the block of ice gets completely melted, the level of water in the container will

#35. The space between the double glass walls of a thermos flask is evacuated space are silvered. The residual source of heat loss takes place by

#36. The equation of a wave is y = 0.005 sin[x(0.5X - 200t)] where x and y are in meters and t is in seconds. What is the velocity of the wave?

#37. Which of the following characteristics of a wave is used in the measurement of the depth of the sea?

#38. A note is the octave of another note if it has

#39. A platinum resistance thermometer wire has a resistance of 5 ohms at 0oC and 5.5 ohms at 100oC. Calculate the temperature of the wire when the resistance is 5.2 ohms

#40. A bridge made of steel is 600m long. What is the daily variation in its length if the night-time and daytime temperatures are 10oC and 35oC respectively. The linear expansivity of steel is 0.000012C-1

#41. One of the most important applications of bi-metallic strip is found in the construction of

#42. At constant pressure, the density of a fixed mass of gas is

#43. How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg-1K-1 is heated from 20oC to 70oC?

#44. A stone, Q is thrown with velocity U at an angle of 75o to the horizontal. Another stone R is thrown with the same velocity U but with an angle of 15o to the horizontal. The ranges covered by the stones will be

#45. A man weight 800N climbs up a stairs to height of 15m in 12.5s. What is the man''s average power output?

#46. A machine requires 1000J of work to raise a load of 500N through a vertical distance of 1.5m. Calculate the efficiency of the

#47. If a plastic sphere floats in water (density = 1000kgm3) with 0.5 of its volume submerged, and floats in oil with 0.4 of its volume submerged the density of the oil is

#48. What is the least possible error in using a rule graduated in centimeters?

#49. Which of the following affects the period of a simple pendulum? i. mass of the pendulum bob. ii. length of the pendulum. iii. acceleration due to gravity.

#50. A boy sits in a train moving with uniform speed on a straight track. If from his outstretched palm he gently tosses his coin upwards, the coin will fall

#51. A body starts from rest and moves with uniform acceleration of 6ms-2. What distance does it cover in the third seconds

#52. Images formed by a convex mirror are always

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

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

#55. Which of the following will reduce the frequency of oscillation of a simple pendulum?

#56. When the nucleus of a uranium atom is split into two fragments of nearly equal mass the sum of the masses of the fragments is less than the mass of the original nucleus. This difference is a measure of the

#57. A sheet of paper is placed in the path of a beam of radiations from a radioactive source. Which of the following radiations will pass through the paper?I. Alpha rays II. Beta rays III. Gamma rays

#58. The process by which a metal, heated to high temperature, gives off electrons from its surface is known as

#59. An electric string of length l is elastically stretched through a length e by a force F. The area of cross- section of the string is A and its Young’s modulus is E. Which of the following expressions is correct?

#60. lf the frequency of the a.c. circuit illustrated is 500Hz/ π what would be the reactance in the circuit?

#61. Which of the following statements is correct about cathode rays? They are fast moving

#62. Which of the following gives rise to the line spectra obtained from atoms?

#63. A stream of alpha particles is projected into an electric field between two plates X and Y as shown in the diagram above. Which of the following is correct? The particles are

#64. An element whose half-life is 3 years has N atoms. How many atoms would have decayed after 9 years

#65. Calculate the energy stored in 20μF capacitor if the potential difference between the plates is 40 V

#66. What is the electric potential at a point distance r from a proton of charge q placed in a medium of permittivity εo?

#67. alculate the rate at which energy is used up in the circuit illustrated by the diagram

#68. Calculate the length of a constantan wire of cross- sectional area 4 π x 10-8m2 and resistivity 1.1 x 10-6 Ω m required to construct a standard resistor of resistance 21 Ω. [Take π = 22/7]

#69. Calculate the time in which 4.8 kJ of energy would be expended when an electric heater of resistance 1.8 x 103Ω is used on a 240 V mains supply. (Neglect heat losses to the surrounding).

#70. Which of the following waves are longitudinal waves? l. Ripples on the surface of water II. Waves produced by a tuning fork vibrating in air III. Light waves IV. Waves produced by a flute

#71. Question 81 A pipe closed at one end is 1.0m long. The air in the pipe is set into vibration and a fundamental note of frequency 85Hz is produced. Calculate the velocity of sound in the air. (Neglect end correction).

#72. A negatively charged rod is brought near the cap of a gold-leaf electroscope. The cap is earthed momentarily while the rod is near to it. The rod is then removed. Which of the following is correct?

#73. The angle of deviation of light of various colours passing through a glass prism decreases in the order of

#74. The diagram above shows a waveform in which energy is transferred from A to B in a time of 2.5 x 10-3s. Calculate the frequency of the wave

#75. Which of the following radiations have the highest frequency?

#76. How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 ms-1)