Physics Past Questions v27 for (JAMB/WAEC/NECO)

Physics Past Questions v27 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 v27 For (JAMB/WAEC/NECO)

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#1. The phenomenon of photoelectric effect is NOT used in

A) automatic doors

B) bimetallic strip thermometers

C) light meters in cameras

D) setting off burglar alarms

E) sound production from film tracks.

#2. \A transformer supplies 12V when connected to a 240V mains. If the transformer takes 0.120A from the mains when used to light a 12V, 24W lamp, what is its efficiency?

A) 57.20%

B) 66.60%

C) 83.30%

D) 92.50%

E) 100%

#3. An a.c. generator can be converted into a d.c. generator by replacing

A) the slip rings with split-ring commutators

B) the slip rings with armatures

C) the split-rings with slip rings

D) the split-rings with brushes

E) the brushes with slip-ring commutators.

#4. It is NOT possible to determine exactly and simultaneously the position and momentum of a particle. This statement is known as the

A) Crompton effect

B) de Broglie’s laws

C) Frank-Hertz experimental law

D) Heisenberg’s uncertainly principle

E) wave-particle paradox

#5. A platinum-resistance thermometer has a resistance of 10 ω at 0°C and 18 ω at 100°C. Assuming that resistance changes uniformly with temperature, what is the resistance of the thermometer when the temperature is 45°C?

A) 27.8

B) 17.8

C) 13.6

D) 6.4

E) 3.6

#6. The silvered walls of a vacuum flask minimise loss of heat due to

A) conduction and convection

B) conduction only

C) convection and radiation

D) convection only

E) radiation only

#7. A body of mass M1 moving with a velocity U collides with a stationary body of mass M2 and both move with a common velocity V. If linear momentum is conserved, which expression correctly represents V?

A) M1 + M2 ÷ M1U

B) M2U ÷ M1 – M2

C) M1U ÷ M1 – M2

D) M1U ÷ M1+ M2

E) M2U ÷ M1 + M2

#8. According to the Kinetic Theory, what does NOT occur when the temperature of a constant volume of gas is increased?

A) a decrease in the mean speed kinetic energy of the molecules

B) an increase in the mean speed of the molecules

C) an increase in the momentum change at each collision.

D) an increase in the number of collisions per second

E) an increase in the pressure exerted by the gas.

#9. What is stored by a dry Leclanhé cell?

A) chemical energy

B) heat energy

C) mechanical energy

D) nuclear energy

E) solar energy

#10. Lenz’s law of electromagnetic induction states that

A) e.m.f. is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit

B) the induced e.m.f. in a circuit is proportional to the rate of change f the number of lines of force linking the circuit

C) the induced current in a conductor is in such a direction as to oppose the change producing it

D) a force is exerted in a current-carrying conductor in a magnetic field.

E) the induced e.m.f. is proportional to the current producing the magnetic flux.

#11. Which process will increase the rate of oscillation of a pendulum?

A) decreasing the amplitude of oscillation of the pendulum

B) decreasing the length of the pendulum

C) decreasing the mass of the pendulum

D) increasing the length of the pendulum

E) increasing the mass of the pendulum.

#12. When a current of 1 .0A flows in an electrolyte for 3.0h, a mass of 1 .0g is deposited. What mass will be deposited in 10.0h if a current of 3.0A flows through the electrolyte?

A) 30.0g

B) 24.0g

C) 10.0g

D) 6.0g

E) 0.4g

#13. An object weighing 0.60N is hung on a spiral spring and caused it to extend by 6.0cm. The object is removed and a black of wood replacing it causes the spring to extend by 10.0cm. What is the weight of the block of wood?

A) 0.10N

B) 0.36N

C) 0.80N

D) 1.00N

E) 3.60N

#14. If the refractive index of water is 1.33, what is the critical angle for a water-air boundary?

A) 36.0 °

B) 40.2 °

C) 41.8 °

D) 48.8 °

E) 62.7 °

#15. What does NOT affect the rate of evaporation of a liquid

A) exposed surface area of the liquid

B) humidity of the surroundings

C) nature of the liquid

D) temperature the liquid

E) volume of the liquid.

#16. The use of electrical fuses in domestic wiring is

A) to prevent and electrical shock

B) to supply electricity to all the electrical appliances

C) to allow electricity to flow easily through the mains to all the circuits

D) to cut off the mains supply it too high a current flows

E) to fuse all the circuit into one

#17. Which radiation is emitted when a beam of fast moving cathode rays is stopped by a heavy element?

A) Alpha rays

B) Gamma rays

C) Positive rays

D) Ultraviolet rays

E) X-rays

#18. An object is projected with a velocity of 50ms-1 from ground level at an angle θ to the vertical. If the total time of flight of the projectile is 5s, what is the value of θ? (g = 10ms-2)

A) 0°

B) 30°

C) 45°

D) 60°

E) 90°

#19. A body of weight 20N displaces 12N of the liquid in which it is immersed. What is the upthrust of the liquid on the body?

A) 240N

B) 32N

C) 20N

D) 12N

E) 8N

#20. If the temperature of a resistance wire is gradually increased, its resistance will

A) decrease gradually

B) first increase and then decrease

C) first increase and then remain the same

D) increase gradually

E) remain the same

#21. If the size of the hole of a pinhole camera is increased, the image formed becomes

A) brighter and blurred

B) brighter and larger

C) brighter and sharper

D) blurred and duller

E) blurred and larger

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

A) aluminium, copper, iron

B) aluminium, iron, copper

C) copper, aluminium, iron

D) copper, iron. aluminium

E) iron, copper, aluminium

#23. A body executing a simple harmonic motion has an angular velocity of 22 radians per second. If it has a maximum

A) 1100ms-1

B) 440 ms-1

C) 220 ms-1

D) 22 ms-1

E) 2.2ms-1

#24. In which simple machine is the effort applied between the load and the fulcrum?

A) claw hammer

B) nut crackers

C) pliers

D) sugar tongs

E) wheelbarrow

#25. In the normal use of a simple microscope, a person sees an

A) erect, real and magnified image

B) erect, virtual and magnified image

C) inverted, virtual and magnified image

D) inverted, real and magnified image

E) inverted and real image the same size as the object

#26. What is the escape velocity of a satellite launched from the earth’s surface? (Take g as 10ms-2 and the radius of the earth as 6.4 × 106m)

A) 7.80 × 10-3ms-1

B) 1.13 × 10-4ms-1

C) 3.56 × 107ms-1

D) 6.00 × 107ms-1

E) 1.20 × 108ms-1

#27. A body of mass 4 kg is accelerated from rest by a steady force of 9N. What is its speed when it has travelled a distance of 8m?

A) 6 ms-1

B) 18 ms-1

C) 32 ms-1

D) 36 ms-1

E) 48 ms-1

#28. A brass cube of side 10cm is heated through 30°C. If the linear expansivity of brass is 2.0 × I0-5 K-1 , what is the increase in its volume?

A) 0.06 cm3

B) 0.18cm3

C) 0.60cm3

D) 1.20cm3

E) 1.80cm3

#29. Which statement is NOT correct about Rutherford’s model of the atom?

A) The diameter of the nucleus is of the order of 10-15m

B) The mass of an atom is concentrated in the nucleus

C) The model is applicable to atoms with one electron in the outer shell

D) The nucleus of an atom is positively charged

E) The nucleus is surrounded by an electron cloud.

#30. An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?

A) 10k

B) 50k

C) N1.00

D) N5.00

E) N10.00

#31. Question 31 An object 8cm in front of a plane mirror moves at a speed of 6cm s-1 away from the mirror. What will be the distance separating the object and the image after 2s?

A) 8cm

B) 12cm

C) 20cm

D) 28cm

E) 40cm

#32. Which is a fundamental unit?

A) ampere

B) joule

C) Newton

D) ohm

E) watt

#33. Which device does NOT make use of the magnetic effects of an electric current?

A) hot-wire ammeter

B) moving-coil ammeter

C) moving-coil loudspeaker

D) moving-iron ammeter

E) telephone earpiece

#34. In an operating X-ray tube, a high p.d is applied between the cathode and the anode for the purpose of

A) accelerating the electrons to a very high energy

B) concentrating electrons on the target

C) heating the anode

D) heating the cathode

E) producing a stream of electrons

#35. The ability of the eye to focus on objects at various distances is known as

A) accommodation

B) astigmatism

C) eye ring

D) myopia

E) presbyopia

#36. What part of a camera functions in a similar way to the retina of the eye?

A) diaphragm

B) film

C) focusing ring

D) lens

E) shutter

#37. The wavelength of a stationary wave is 24.0cm. What is the distance between a node and the next antinodes?

A) 6.0cm

B) 12.0cm

C) 18.0cm

D) 24.0cm

E) 48.0cm

#38. If the total force acting on a particle is zero, the linear momentum will

A) Increase

B) Decrease

C) Be Constant

D) Increase then decrease

#39. The colours seen on soap bubbles are due to

A) Diffraction

B) Refraction

C) Dispersion

D) Interference

#40. A transistor is used in the amplification of signals because it

A) controls the flow of current

B) consumes a lot of power

C) allows doping

D) contains electron and hole carriers

#41. The carbon-granules microphone works on the principle of change in

A) inductance

B) resistance

C) capacitance

D) voltage

#42. At what frequency would a capacitor of 2.5μF Used in radio circuit have a resistance of 250Ω

A) π/800 Hz

B) 800/π Hz

C) 200π Hz

D) 2000π Hz

#43. A current of 0.5 A flowing 3h Deposits 2g of metal during electrolysis. The quantity of the same metal that would be deposited by the currents of 1.5A flowing in 1h is

A) 2g

B) 6g

C) 10g

D) 18g

#44. Which of the following statements is true of the properties of a moving coil galvanometer?

A) THe coil has a small area

B) There are strong hair springs to gives a large control panlel

C) There is a strong permanent magnet to give high magnetic flux

D) it has a small number of turns of coil

#45. Pure silicon can be converted to a p-type by adding a controlled amount of

A) trivalent atoms

B) tetravalent atoms

C) pentavalent atoms

D) hexavalent atoms

#46. The energy associated with the photon of a radio transmission at 3 x 105 Hz is [h = 6.63 x 10-34Js]

A) 2.00 x 10-28J

B) 1.30 x 10-28J

C) 2.00 x 10- 29J

D) 1.30 x 10-29J

#47. The percentage of the original nuclei of the sample of a radioactive substance left after 5 half - lives is

A) 8%

B) 5%

C) 3%

D) 1%

#48. From the generating station to each substation power is transmitted at a very high voltage so as to reduce

A) hysteresis loss

B) eddy current loss

C) magnetic flux leakage

D) heating in the cells

#49. Question 51 The particle that is responsible for the nuclear fission in a nuclear reactor is

A) neutron

B) prton

C) electron

D) photon

#50. An electric iron is rated 1000W, 230V. What is the resistance of its elements?

A) 51.9Ω

B) 52.9Ω

C) 55.9Ω

D) 57.6Ω

#51. The electric field between two - point charges is shown in the diagram above. What types of charges are at X and Y?

A) Both X and Y are negative

B) Both X and Y are positive

C) X is positive and Y is negative

D) X is negative and Y is positive

#52. The electromagnetic wave that can produce a heating effect on the environment is

A) x -rays

B) ultraviolet rays

C) infrared rays

D) gamma rays

#53. an electric cell with nominal voltage E has a resistance of 3Ω connected across it. If the voltage falls to 0.6E, the internal resistance of the cell is

A) 1Ω

B) 2Ω

C) 3Ω

D) 4Ω

#54. 23 Na + X → 20 F + 4 He 11 9 2 What particle is X in the reaction above?

A) Alpha

B) Beta

C) Neurons

D) Gamma

#55. Calculate the refractive index of the material for the glass prism in the diagram above

A) √2/2

B) 4/3

C) √2

D) 3/2

#56. From the diagram above, determine the value of the resistance X

A) 6Ω

B) 9Ω

C) 12Ω

D) 15Ω

#57. The energy stored in a capacitor of capacitance 10μF carrying a charge of 100μC

A) 5 x 104 J

B) 4 x 102 J

C) 4 x 10-3 J

D) 5 x 10-4 J

#58. When connected to a mains of 250V, the fuse rating in the plug of an electric device of 1 KW is

A) 2 A

B) 3 A

C) 4 A

D) 5 A

#59. The eye controls the amount of light reaching the retina by adjusting the

A) cornea

B) iris

C) retina

D) optic nerve

#60. The diagram above show s the force-extension curve of a piece of wire. The energy stored when the wire is stretched from E to F is

A) 7.5 x 10-3J

B) 2.5 x 10-3J

C) 1.5 x 10-2J

D) 7.5 x 10-1J

#61. The diagram above shows the force (F) acting on an object through a distance (x). The work done on this object is expressed as

A) Fx J

B) Fx/2 J

C) Fx2 J

D) F/x J

#62. blowing air over a liquid aids evaporation by

A) increasing its surface area

B) decreasing its vapour pressure

C) increasing its temperature

D) decreasing its density

#63. The phenomenon that makes sound persist when its source has been removed is known as

A) acoustic vibration

B) rarefaction

C) echo

D) reverberation

#64. the pressure of 3 moles of an ideal gas at a temperature of 27°C having a volume of 10-3m3 is

A) 2.49 x 105-2

B) 7.47 x 105-2

C) 2.49 x 106-2

D) 7.47 x 106-2

#65. Vibration in a stretched spring cannot be polarized because they are

A) stationary waves

B) transverse waves

C) longitudinal waves

D) mechanical waves

#66. The time rate of loss of heat by a body is proportional to the

A) difference in temprature between the body and its surroundings

B) temperature of its surroundings

C) ratio of the temperature of the body to that of its surroundings

D) temperature of the body

#67. If tension is maintained on a stretched string of length 0.6m, such that its fundamental frequency of 220Hz is excited, determine the velocity of the transverse wave in the string.

A) 528 ms-1

B) 264 ms-1

C) 132 ms-1

D) 66 ms-1

#68. A concave mirror of radius of curvature 40 cm forms a real image twice as large as the object. The object distance is

A) 10 cm

B) 30 cm

C) 40 cm

D) 60 cm

#69. water is a poor thermometric liquid because it

A) is opaque

B) is a poor conductor

C) wets glass

D) has low vapour pressure

#70. a ray of light which strikes a glass slab from air at normal incidence passes through the slab

A) undeviated and undisplaced at a lower speed

B) deviated and undisplaced at a lower speed

C) deviated and displaced at a lower speed

D) undeviated and displaced at a faster speed

#71. I. Temperature. II. Density of air molecules III. Pressure IV. Pitch Which of the above will affect the velocity of sound in the air

A) I and II only

B) II and IV only

C) I,II and IV only

D) I,II,III nad IV

#72. Which of the following is a characteristics of stationary waves?

A) They are formed by two identical waves travelling in opposite directions

B) they can be transverse or longitudinal

C) The distance between two successive nodes is one wavelenght

D) The antinode is a point of minimum displacement

#73. To produce an enlarged and erect image with a concave mirror,the object must be positioned

A) at the principal focus

B) beyond the centre of curvature

C) between the principal focus and the centre of the curvature

D) between the principal focus and the pole

#74. the property that is propagated in a traveling wave is

A) frequency

B) amplitude

C) energy

D) wave lenght

#75. Which of the following eye defects can be corrected using a cylindrical lens.

A) myopia

B) Astigmatism

C) Presbyopia

D) Chromatic abiration

#76. Two force each of 10N acts on a body, one towards the north and the other towards the east. The magnitude and the direction of the resultant force are

A) 20N, 45°E

B) 20N, 45°W

C) 10√2N, 45°W

D) 10√2N, 45°E

#77. A particle in circular motion performs 30 oscillation in 6 seconds. Its angular velocity is

A) 5 rad s-1

B) 6 rad s-1

C) 5π rad s-1

D) 10π rad s-1

#78. The effect of a particle in a fluid attaining its terminal velocity is that the

A) acceleration is maximum

B) weight is equal to the retarding force

C) buoyancy force is equal to the to the viscous retardind force

D) buoyancy force is more than the weight of the fluid displaced

#79. A coin place below a rectangular glass block of thickness 9cm and refractive index 1.5 is viewed vertically above the block. The apparent displacement of the coin is

A) 3 cm

B) 5 cm

C) 6 cm

D) 8 cm

#80. The radiator of a motor car is cooled by

A) radiation

B) conduction

C) convection

D) radiation and conduction

#81. A copper cube weighs 0.25 N in air, 0.17N when completely immersed in paraffin oil and 0.15 N when completely immersed in water.The ratio of upthrust in oil to upthrust in water is

A) 3 : 5

B) 4 : 5

C) 7 : 10

D) 13 : 10

#82. A wheel and axle is used to raise a load of 500 N by the application of an effort of 250 N. If the radii of the wheel and the axle are 0.4 cm and 0.1 cm respectively, the efficiency of the machine is

A) 20 %

B) 40 %

C) 50 %

D) 60 %

#83. The hydrostatic blood pressure difference between the head and the feet of a boy standing straight is 1.65 x 104 Nm-2. Find the height of t he boy.

A) 0.5 m

B) 0.6 m

C) 1.5 m

D) 2.0 m

#84. A body weighing 80N stands in an elevator that is about to move. The force exerted by floor on the body as the elevator moves upward with an acceleration of 5 ms-2 is [g = 10ms-2]

A) 40 N

B) 80 N

C) 120 N

D) 160 N

#85. If the distance between two suspended masses 10kg each is tripled, the gravitational force of attraction between them is reduced by

A) one half

B) one third

C) one quarter

D) one ninth

#86. A car starts from rest and covers a distance of 40m in 10s. Calculate the magnitude of its acceleration

A) 0.25ms-2

B) 0.80ms-2

C) 3.20ms-2

D) 4.00ms-2

#87. The maximum displacement of a vibrating tunning fork is its

A) amplitude

B) frequency

C) period

D) wavelength

#88. Which of the following materials is used to control the rate of neutron production in a nuclear reactor?

A) boron rods

B) concrete shield

C) graphite rods

D) uranium rods

#89. A freely-suspended magnet swinging in a horizontal plane comes to rest with its axis pointing approximately

A) north-south

B) south-west

C) north-east

D) south-east

#90. If a radioactive atom emits a beta particle, Its mass number

A) increases by one

B) remains the same

C) decreases by one

D) increases by two

#91. Which of the following is usually used to cause fission in an atomic reactor?

A) Alpha particles

B) beta particles

C) electrons

D) Neutrons

#92. The magnitude of the gravitational attraction between the earth and a particle is 40N. If the mass of the particle is 4kg. Calculate the magnitude of the gravitational field intensity of the earth on the particle

A) 10.0N kg-1

B) 12.6N kg-1

C) 25.0N kg-1

D) 160.0N kg-1

#93. The lead-acid accumulator consists of a

A) lead as the positive electrode

B) lead ocide as the negative electrode

C) hydrochloric acid as the electrolyte

D) tetraoxosulphate(VI) acid as the electrolyte

#94. Which of the following actions will not lead to an increase in the induced e.m.f. in a coil of wire rotating between the poles of a magnet? Increasing the

A) strength of the magnet

B) number of turns in the coil

C) speed of location in the coil

D) gap between the poles of the magnet

#95. A transformer has 400 turns and 200 turns in the primary and secondary windings respectively. If the current in the primary and secondary windings are 3A and 5A respectively. calculate the efficiency of the transformer?

A) 85.0%

B) 83.3%

C) 37.5%

D) 30.0%

#96. Which of the following instruments is not a wind instrument?

A) clarinet

B) saxophone

C) trumpet

D) xylophone

#97. Which of the following actions will not cause an increase in the frequency of a vibrating string?

A) increasing the tension of the string

B) decrease the mass per unit lengthof the string

C) decrease the length of the string

D) increasing the cross sectional area of the string

#98. Which of the following items can be used to compare the relative magnitudes of electric charges on two bodies?

A) ebonite rod

B) gold leaf electroscope

C) proof plane

D) the electrophorus

#99. Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. [G = 6.70 x 10-11Nm-2kg-2]

A) 6.70 x 10-11N

B) 6.70 x 10-10N

C) 6.03 x 10-11N

D) 6.03 x 10-7N

#100. The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium

A) 68o

B) 56o

C) 34o

D) 18o

#101. A converging lens of focal length 15cm forms a virtual image at a point 10cm from the lens. Calculate the distance of the object from the lens

A) 10.00cm

B) 6.00cm

C) 5.00cm

D) 1.50cm

#102. In a compound microscope, the image formed by the objective lens is at a distance of 3.0cm from the eye lens. Calculate the focal length of the eye lens

A) 0.3cm

B) 2.7cm

C) 3.4cm

D) 8.3cm

#103. A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560ms-1]

A) 312.0m

B) 156.0m

C) 78.0m

D) 31.2m

#104. When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon can be called

A) beats

B) diffraction

C) overtones

D) resonance

#105. A slinky spring fixed at one end is placed horizontally on a table. The free end is displaced parallel to the table and then released. The resultimg wavelength is

A) transverse

B) longitudinal

C) stationary

D) electromagnetic

#106. A radio wave has a wavelength of 150m. If the velocity of radio waves is free spaces is 3 x 104ms-1, calculate the frequency of the radio wave

A) 4.50 x 1010Hz

B) 5.0 x 109Hz

C) 4.5 x 109Hz

D) 2.0 x 106Hz

#107. The size of the hole of a pin hole camera is increased. The resultant image formed becomes

A) sharper

B) reduced in size

C) enlarged

D) blurred

#108. Which of the following actions will improve the efficiency of the pulley system?

A) reducing the mass of the pulley

B) increasing the friction force between the string and the pulley

C) increasing the mass per unit length of the string of the pulley

D) increasing the mass of the pulley

#109. The ice and steam points of a certain thermometer are -20o and 100o respectively. Calculate the Celsius temperature temperature corresponding to 70o on the thermometer

A) 84.0o

B) 75.0o

C) 64.0o

D) 58.0o

#110. The silver coating on the inside of a vacuum flask reduces heat loss by

A) conduction

B) radiation

C) condensation

D) convention

#111. Water of mass 120g at 50oC is added to 20og of water at 10oC and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]

A) 60oC

B) 40oC

C) 25oC

D) 10oC

#112. A spiral spring of natural length 30.0cm and force constant of 20Nm-1 is compressed to 20.0cm. Calculate the energy stored in the spring

A) 0.1J

B) 1.0J

C) 10.0J

D) 100.0J

#113. In the diagram above, AB represents a uniform rod of length 1.50m which is in equilibrium on a pivot at P, If AP = 40cm, calculate the mass of the rod. [g = 10ms-2]

A) 0.280kg

B) 0.400kg

C) 0.613kg

D) 0.800kg

#114. Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved

A) parallel to the line of action of the force from a reference point

B) perpendicular to the line of action of the force from a reference point

C) on a line through the reference point

D) by the object

#115. a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms-2]

A) 60W

B) 80W

C) 100W

D) 120W

#116. A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantages

A) 12.0

B) 10.0

C) 3.6

D) 1.8

#117. A man was moving round a circular path continuously for 4 minutes and covered the following distances in the times stated : Distance (in metres) 200, 400, 600, 300 Time(in minutes) : 1, 2, 3, 4 respectively. Which of the following statements is correct about the motion of the man?

A) the man was moving without uniform velocity

B) the speed was changing constantly

C) the velocity was uniform

D) it was an instance of motion in which both speed and velocity are the same

#118. An object is released from rest at a height of 25m. Calculate the time it takes to fall to the ground. [g = 10ms-2]

A) 25.00s

B) 10.00s

C) 2.50s

D) 2.24s

#119. An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is not correct?

A) The resultant of the parallel force is zero

B) the algebraic sum of the moment of the forces is zero

C) all the parallel forces must be equal in magnitude and in direction

D) the sum of the forces in one direction must be equal to the sum of forces in the opposite direction

#120. An object A is held in equilibrium as illustrated in the diagram above. Using the data on the diagram determine the magnitude, W of the weight of

A) 23N

B) 17N

C) 7N

D) 5N

#121. A reservoir is filled with a liquid of density 2000kgm-3. Calculate the depth at which the pressure in the liquid will equal to 9100Nm-2 [g = 10ms-2]

A) 0.262m

B) 0.455m

C) 0.664m

D) 0.819m

#122. A solid weight 45N and 15N respectively in air and water. Determine the relative density of the solid

A) 0.33

B) 0.50

C) 1.50

D) 3.00

#123. One common characteristics of solids, liquids and gasses is that

A) all the three has fixed volume

B) their molecule have the same size

C) their molecules are always in motion

D) all the three have the same inter molecular forces

#124. A boy travels 8 km eastward to a point B and then 6km northward to another point C. Determine the difference between the magnitude of displacement of the boy and distance travelled by him

A) 2.0km

B) 4.0km

C) 10.0km

D) 13.0km

#125. The force between the molecules of a liquid in contact with that of a solid is

A) adhesive

B) cohesive

C) magnetic

D) repulsive

#126. What type of motion does the skin of a talking drum perform when its being struck with the drum stick?

A) random

B) rational

C) vibratory

D) translational

E) circular

#127. A sheet of paper is placed in the path of the following radiations: I. Alpha particles II. Beta particles III. Gamma rays. Which of the radiations will pass through the sheet of paper?

A) I only

B) II only

C) I and II only

D) II and III only

#128. Calculate the inductance L of the coil in the circuit shown below.

A) 14.4H

B) 3.8H

C) 0.6H

D) 0.4H

E) 0.2H

#129. Calculate the heat energy required to vapourize 50g of water initially at 80oC if the specific heat capacity of water is 4.2Jg-1K (specific latent heat of vapourization of water is 2260Jg-1).

A) 533000J

B) 230000J

C) 117200J

D) 113000J

E) 4200J

#130. Local action is normally prevented from taking place in a simple electric cell by

A) introducing an oxidising agent into the acid

B) not drawing current continuously for long periods

C) amalgamating the surface of the zinc plate

D) using a porous pot to isolate the zinc plate from the acid

E) using dilute sulphuric acid

Finish

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