Physics Past Questions v40 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 v40 For (JAMB/WAEC/NECO)

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#1. Control in nuclear reactors is effected with boron rods because rhe rods have the ability to

A) absorb electrons

A) absorb electrons

B) absorb neutron

B) absorb neutron

C) accelerate electrons

C) accelerate electrons

D) slow down neutrons

D) slow down neutrons

#2. Fleming's right hand rule is also called the

A) motor rule

A) motor rule

B) dynamo rule

B) dynamo rule

C) screw rule

C) screw rule

D) thumb rule

D) thumb rule

#3. A transformer is required to supply 12 Vrms to operate a toy train set from a 240 Vrms. If the number of turns in the in the secondary coil is 100, calculate the number of turns required in the primary coil

A) 5

A) 5

B) 12

B) 12

C) 2000

C) 2000

D) 2400

D) 2400

#4. A direct current of 5A flow through a 0.2H inductor. Calculate the energy stored in the inductor

A) 0.5J

A) 0.5J

B) 1.0J

B) 1.0J

C) 2.5J

C) 2.5J

D) 5.0J

D) 5.0J

#5. When a radioactive substance undergoes a beta decay, its

A) mass number decreases by 1

A) mass number decreases by 1

B) atomic number decreases by 1

B) atomic number decreases by 1

C) mass number increases by 1

C) mass number increases by 1

D) atomic number increases by 1

D) atomic number increases by 1

#6. Which of the following is a unit of the time rate of flow of electric charges?

A) coulomb

A) coulomb

B) ampere

B) ampere

C) volt

C) volt

D) watt

D) watt

#7. A voltmeter is a device that

A) draws high current

A) draws high current

B) has a very low resistance

B) has a very low resistance

C) has a very high resistance

C) has a very high resistance

D) is able to measure both voltage and current

D) is able to measure both voltage and current

#8. Which of the following actions will not increase the sensitivity of a moving coil galvanometer?

A) using a strong temporary magnet

A) using a strong temporary magnet

B) increasing the area and number of turns of the coil

B) increasing the area and number of turns of the coil

C) using a week hair spring

C) using a week hair spring

D) using a light pointer

D) using a light pointer

#9. Which of the following defects of vision is as a result of the eye ball being too long?

A) long sight

A) long sight

B) astigmatism

B) astigmatism

C) short sight

C) short sight

D) loss of accommodation

D) loss of accommodation

#10. A negatively charged rod is held close to an uncharged metal ball on an insulating stand. The ball will

A) be negatively chargeed

A) be negatively chargeed

B) be positively charged

B) be positively charged

C) have an excess negatively charges on the side nearest the rod

C) have an excess negatively charges on the side nearest the rod

D) have an excess positively charges on the side nearest the rod

D) have an excess positively charges on the side nearest the rod

#11. If the charge on an object is measured as 4.0 x 10-18C, how many excess electrons does the object possess, given that the charge of an electron is 1.6 x 10-18C

A) 18

A) 18

B) 19

B) 19

C) 25

C) 25

D) 37

D) 37

#12. In the day time, it is possible to see under shady areas such as under a tree because light has undergone

A) internal reflection

A) internal reflection

B) refraction

B) refraction

C) diffraction

C) diffraction

D) diffuse reflection

D) diffuse reflection

#13. The distance between a concave mirror and an object placed in front of it is 1.0m. If the raduis of curvature of the mirror is 4.0m, the image formed will be

A) 2.00m behind the mirror

A) 2.00m behind the mirror

B) 2.00m in front of the mirror

B) 2.00m in front of the mirror

C) 1.25m in front of the mirror

C) 1.25m in front of the mirror

D) 1.25m behind the mirror

D) 1.25m behind the mirror

#14. The image of an object formed by a convex mirror is

A) real, errect and enlarged

A) real, errect and enlarged

B) real, inverted and enlarged

B) real, inverted and enlarged

C) virtual, erect and diminished

C) virtual, erect and diminished

D) virtual, erect and enlarge

D) virtual, erect and enlarge

#15. When viewed straight down, a fish in a pond is

A) father below than it apperas to be

A) father below than it apperas to be

B) mearer than it appears to be

B) mearer than it appears to be

C) found at exactly the same point it is seen

C) found at exactly the same point it is seen

D) seen beside its image

D) seen beside its image

#16. A converging lens and a screen are placed 20 cm and 80 cm respectively from an object in a straight line so that a sharp image of the object is formed on the screen. If the object is 3cm high. Calculate the height of the image formed

A) 1 cm

A) 1 cm

B) 9cm

B) 9cm

C) 12cm

C) 12cm

D) 15cm

D) 15cm

#17. Water of mass 1.5kg is heated from from 30oC to 80oC using an electric kettle which is rated 5A, 230V. Calculate the time taken to reach the final destination [specific heat capacity of water 4200Jkg-1K-1]

A) 4.57 minutes

A) 4.57 minutes

B) 5.02 minutes

B) 5.02 minutes

C) 7.30 minutes

C) 7.30 minutes

D) 10.04 minutes

D) 10.04 minutes

#18. The working principle of a pressure cooker is based on the

A) increase in the volume of steam inside it

A) increase in the volume of steam inside it

B) complete trapping of heat inside it

B) complete trapping of heat inside it

C) increase in the pressure of the pot

C) increase in the pressure of the pot

D) decrease in the pressure of the pot

D) decrease in the pressure of the pot

#19. It takes a shorter time for a liquid to boil at the top of a mountain than at the base because at the top, the

A) temperature is higher

A) temperature is higher

B) pressure is lower

B) pressure is lower

C) humidity is higher

C) humidity is higher

D) temperature is constant

D) temperature is constant

#20. Light is considered as a transverse wave because it travels

A) through material without causing disturbance of the medium

A) through material without causing disturbance of the medium

B) through space with constant speed

B) through space with constant speed

C) in a direction parallel to the plane containing the electric and magnetic fields

C) in a direction parallel to the plane containing the electric and magnetic fields

D) in a direction perpendicular to the plane containing the electric and magnetic fields

D) in a direction perpendicular to the plane containing the electric and magnetic fields

#21. Which of the following devices convert heat energy to electrical energy?

A) transformer

A) transformer

B) dynamo

B) dynamo

C) thermocouple

C) thermocouple

D) thermostat

D) thermostat

#22. An object of mass 0.25kg moves at a height h above the ground with a speed of 4ms-1, if its mechanical energy at this height is 12 J, determine the value of h. [g = 10ms-1]

A) 0.8m

A) 0.8m

B) 4.0m

B) 4.0m

C) 4.8m

C) 4.8m

D) 5.6m

D) 5.6m

#23. The design of the thermostat of an electric iron is based on the

A) emmision of electrons from metals when heated

A) emmision of electrons from metals when heated

B) increase in size of metals when heated

B) increase in size of metals when heated

C) increase in the density of metals when heated

C) increase in the density of metals when heated

D) change in the mass of metals when heated

D) change in the mass of metals when heated

#24. The diagram above represents the displacement-time graph of the motion of an object thrown upwards. The velocity of the object at the point P is

A) maximum

A) maximum

B) uniform

B) uniform

C) zero

C) zero

D) terminal

D) terminal

#25. The mass attached to a string is moving in a circular path. If the speed is doubled, the tension in the string will be

A) doubled

A) doubled

B) halved

B) halved

C) four times as great

C) four times as great

D) one-fourth as much

D) one-fourth as much

#26. An object of mass 2kg moving with a velocity 3ms-11 collides head-on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms-1. If the objects stick together after collision, calculate their common speed.

A) 0.60ms-1

A) 0.60ms-1

B) 0.67ms-1

B) 0.67ms-1

C) 2.00ms-1

C) 2.00ms-1

D) 3.33-1

D) 3.33-1

#27. A ball is dropped and it hits the floor at a point A. It rebounds upward to a point B. While moving from A to B its

A) kinetic energy is increasing

A) kinetic energy is increasing

B) potential energy is increasing

B) potential energy is increasing

C) potential energy is decreasing

C) potential energy is decreasing

D) kinetic energy remains constant

D) kinetic energy remains constant

#28. A rectangular block of dimensions 2.0m x 1.0m x 0.5m weighs 200N. calculate the maximum pressure exerted by the block on a horizontal floor.

A) 100Nm-2

A) 100Nm-2

B) 200Nm-2

B) 200Nm-2

C) 300Nm-2

C) 300Nm-2

D) 400Nm-2

D) 400Nm-2

#29. A very sensitive spring balance was used to determine the weight of an object at the north pole. When the same spring balance was used to measure the weight of the same object at the equator, it was found to reduce. The explanation for this observation is that

A) it is very hot at the equator

A) it is very hot at the equator

B) the spring balance has expanded

B) the spring balance has expanded

C) the acceleration of free fall due to gravity varies with location

C) the acceleration of free fall due to gravity varies with location

D) the mass of the body is reduced

D) the mass of the body is reduced

#30. Which of the following sets of quantities is fundamental?

A) length, mass and time

A) length, mass and time

B) speed, length and time

B) speed, length and time

C) speed, mass and distance

C) speed, mass and distance

D) distance, speed and time

D) distance, speed and time

#31. which of the following statements about Archimedes' principle is correct? The upthrust on a body is a measure of the

A) mass of fluid displaced

A) mass of fluid displaced

B) weight of the body

B) weight of the body

C) volume of the body

C) volume of the body

D) weight of the fluid displaced

D) weight of the fluid displaced

#32. A car travelling with a uniform velocity of 30ms-1 along a horizontal road overcomes a constant frictional force of 600N. Calculate the power of the engine of the car

A) 18kW

A) 18kW

B) 20kW

B) 20kW

C) 180kW

C) 180kW

D) 200kW

D) 200kW

#33. Which of the following factors can affect the speed of sound in air? i. The temperature of the surrounding ii. The direction of the wind iii. The pitch of the sound.

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) i, ii and iii

D) i, ii and iii) i, ii and iii

#34. Which of the following statements distinguishes thermal conduction for convection? i. Conduction requires a material medium while convection does not ii. In convection, there is actual motion of hot material, while in conduction, molecules molecules vibrates faster about their mean positions iii. Conduction takes place in solids while convection takes place in fluids.

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

#35. A radioactive element has a decay constant of 0.077s-1, calculate its half life

A) 12.5s

A) 12.5s

B) 9.0s

B) 9.0s

C) 5.1s

C) 5.1s

D) 0.5s

D) 0.5s

#36. Nuclear fission is preferred to nuclear fusion in the generation of energy because

A) very high temperature are required for fusion

A) very high temperature are required for fusion

B) the raw material of fusion are not easily obtained

B) the raw material of fusion are not easily obtained

C) energy obtained from fusion is relatively smaller

C) energy obtained from fusion is relatively smaller

D) the by product of fusion are very dangerous

D) the by product of fusion are very dangerous

#37. When light from a source is sent through a gas. i. certain wavelengths are absorbed. ii. a dark line is left. Which of the following is/are correct?

A) i only

A) i only

B) iii only

B) iii only

C) i and ii only

C) i and ii only

D) i and iii only

D) i and iii only

E) ii and iii only

E) ii and iii only

#38. Which of the following statements about wave is not correct? i. A wavefront is a line which contains all particles whose vibration are in phase. ii. The direction of propagation of a wave is the link drawn parallel to the wavefront. iii. A wavefront is a circle which is common to particles that are in the same state of disturbance

A) i only

A) i only

B) ii only

B) ii only

C) i and ii only

C) i and ii only

D) i and iii only

D) i and iii only

E) ii and iii only

E) ii and iii only

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