Physics Past Questions v48 for (JAMB/WAEC/NECO)

Physics Past Questions v48 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 v48 For (JAMB/WAEC/NECO)

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#1. Which of the following properties is an advantage of lead-acid accumulator over an alkaline accumulator?

A) possesses low internal resistance

A) possesses low internal resistance

B) can be recharges

B) can be recharges

C) has shorter life span

C) has shorter life span

D) possesses high e.m.f

D) possesses high e.m.f

#2. Six dry cells each of e.m.f. 2.0 and internal resistance of 1.0 omega are connected in parallel across a load of 3.0 omega. Calculate the effective current in the circuit

A) 0.63A

A) 0.63A

B) 0.50A

B) 0.50A

C) 0.31A

C) 0.31A

D) .22A

D) .22A

#3. A 12 omega resistor dissipates 8 kJ of heat in 20s. Calculate the current through the resistor

A) 5.8A

A) 5.8A

B) 6.9A

B) 6.9A

C) 30.0A

C) 30.0A

D) 33.3A

D) 33.3A

#4. A telescope is said to be in normal adjustment when the

A) focal length of he objective is greater than that of the eyepiece

A) focal length of he objective is greater than that of the eyepiece

B) focal length of the eyepiece is greater than that of the objective

B) focal length of the eyepiece is greater than that of the objective

C) focal length of the eyepiece is equal to that of the objective

C) focal length of the eyepiece is equal to that of the objective

D) objective focal point coincides wih that of the eyepiece

D) objective focal point coincides wih that of the eyepiece

#5. The sound heard by a person after the reflection of the sound generated by him is called

A) reverberation

A) reverberation

B) resonance

B) resonance

C) echo

C) echo

D) audibility

D) audibility

#6. Which of the following sets of coloured light is/are secondary colours i. Red, Blue and green ii. Blue, cyan and magneta iii. Green, Magenta and yellow, IV Yellow, Cyan and Magenta

A) i and ii only

A) i and ii only

B) ii and iii only

B) ii and iii only

C) iv only

C) iv only

D) i, ii and iv only

D) i, ii and iv only

#7. When two like charges are brought together, the potential energy of the system formed will

A) increase because work is done against the field

A) increase because work is done against the field

B) increase because work is done by the field

B) increase because work is done by the field

C) decrease because work is done by the field

C) decrease because work is done by the field

D) decrease because work is done against the field

D) decrease because work is done against the field

#8. When two waves are superimposed on each other, the following occurrences are possible, except

A) nodal lins

A) nodal lins

B) anti nodal lines

B) anti nodal lines

C) stationary waves

C) stationary waves

D) dispersion

D) dispersion

#9. Which of the following properties of waves is exclusive to transverse waves?

A) reflection

A) reflection

B) interference

B) interference

C) diffraction

C) diffraction

D) polarization

D) polarization

#10. An object of height 2.5cm is places 20cm from a convex mirror of focal length 10cm. Calculate the height of its image

A) 2.5 cm

A) 2.5 cm

B) 3.0cm

B) 3.0cm

C) 5.0cm

C) 5.0cm

D) 25.0cm

D) 25.0cm

#11. A to eater to glass to air to water to glass to air. Given that the refractive index for light passing from air to water is 4/3 and air to glass is 3/2 , calculate the refractive index of glass relative to water

A) 0.50

A) 0.50

B) 0.67

B) 0.67

C) 0.75

C) 0.75

D) 1.13

D) 1.13

#12. An object is placed at a point X between the focal point F and the optical centre C of a diverging lens. If F is the focal point on the other side of the lens, the image of the object is formed between

A) F and X

A) F and X

B) X and C

B) X and C

C) C and F

C) C and F

D) F and 2F

D) F and 2F

#13. A metal sheet of area 100cm2 was heated through 70oC. Calculate its new area if the linear expansivity of the metal is 0.000017k-1

A) 100.06 cm2

A) 100.06 cm2

B) 100.12cm2

B) 100.12cm2

C) 100.24cm2

C) 100.24cm2

D) 100.36cm2

D) 100.36cm2

#14. The thermopile is a device for detecting

A) radioactive radiations

A) radioactive radiations

B) adiant energy

B) adiant energy

C) x-rays

C) x-rays

D) the presence of electrons

D) the presence of electrons

#15. In the formation of sea breeze. wind blows from

A) sky to land

A) sky to land

B) sea to sky

B) sea to sky

C) land to sea

C) land to sea

D) sea to land

D) sea to land

#16. A piece of copper of mass 20g at a temperature of 110oC was dropped into a mixture of ice and water at 0oC. If the final steady temperature of the mixture is 0oC . Calculate the amount of ice that melted [Specific heat capacity of copper = 0.4 Jg-1k-1, specific latent heat of fusion of ice = 330Jg]

A) 0.37g

A) 0.37g

B) 0.60g

B) 0.60g

C) 2.40g

C) 2.40g

D) 2.70g

D) 2.70g

#17. Which of the following factors decreases the rate of evaporation of a liquid?

A) increase in pressure over the liquid

A) increase in pressure over the liquid

B) lowering the boiling point

B) lowering the boiling point

C) decreasing in humidity

C) decreasing in humidity

D) wind

D) wind

#18. A resultant force of magnitude 15N acts on a body of mass 250g. Calculate the magnitude of the acceleratio

A) 0.06 ms-2

A) 0.06 ms-2

B) 3.75ms-2

B) 3.75ms-2

C) 16.67ms-2

C) 16.67ms-2

D) 60.00ms-2

D) 60.00ms-2

#19. A girl stands on a scale in a lift. If the reading on the scale is less than her weight, then the lift is moving

A) upward at uniform speed

A) upward at uniform speed

B) upward with uniform acceleration

B) upward with uniform acceleration

C) downward with uniform speed

C) downward with uniform speed

D) downward with uniform acceleration

D) downward with uniform acceleration

#20. The S.I unit of heat is

A) joule

A) joule

B) kelvin

B) kelvin

C) watt

C) watt

D) ampere

D) ampere

#21. A body is pulled through a distance of 500m by a force of 20N. If the power developed is 0.4kW, calculate the time for which the force acts

A) 250.0s

A) 250.0s

B) 25.0s

B) 25.0s

C) 2.5s

C) 2.5s

D) 0.5s

D) 0.5s

#22. a bird flies at 10ms-1 for 3s, 15ms-1 for 3s and 20 ms-1 for 4s. Calculate the bird's average speed

A) 4.5 ms-1

A) 4.5 ms-1

B) 15.0 ms-1

B) 15.0 ms-1

C) 15.5 ms-1

C) 15.5 ms-1

D) 51.7 ms-1

D) 51.7 ms-1

#23. When a body is slightly titled, it is found that its centre of gravity s slightly raised. What is the state of equilibrium of the body?

A) unstable

A) unstable

B) stable

B) stable

C) neutal

C) neutal

D) cannot be detrmined

D) cannot be detrmined

#24. Which of the following devices is used to determine the relative density of an acid?

A) manometer

A) manometer

B) hydrometer

B) hydrometer

C) hypsometer

C) hypsometer

D) hygrometer

D) hygrometer

#25. A block of wood of density 0.6 gcm-3, weighing 3.06N in air, floats freely in a liquid of density 0.9 gcm-3. Calculate volume of the portion immersed (g = 10ms-2)

A) 510cm3

A) 510cm3

B) 340cm3

B) 340cm3

C) 254cm3

C) 254cm3

D) 170cm3

D) 170cm3

#26. A metal ball of weight W falls through a column of glycerine of viscosity V. If the ball experiences an upthrust U and terminal velocity is attained, then

A) W > U + V

A) W > U + V

B) W = U + V

B) W = U + V

C) W = U - V

C) W = U - V

D) W < U + V

D) W < U + V

#27. The movement of fluid up or down a narrow tube is

A) osmosis

A) osmosis

B) brownian motion

B) brownian motion

C) capillarity

C) capillarity

D) diffusion

D) diffusion

#28. Which of the following substances is the most volatile at room temperature?

A) water

A) water

B) diesel

B) diesel

C) petrol

C) petrol

D) kerosine

D) kerosine

#29. The derived unit of pressure can be expressed as

A) kgms-2

A) kgms-2

B) kg m-1s-2

B) kg m-1s-2

C) kg m-2s-2

C) kg m-2s-2

D) kg m-1s2

D) kg m-1s2

#30. The diagram above illustrates trapped air in a syringe placed in water that is gradually heated. It is observed that the piston rises as the temperature of the water rises. Which of the following statements explains this observation?

A) frequency of collision of trapped air molecules with walls of the syringe is more

A) frequency of collision of trapped air molecules with walls of the syringe is more

B) molecules of trapped air expands more

B) molecules of trapped air expands more

C) speed of the trapped air molecules decreases

C) speed of the trapped air molecules decreases

D) number of molecules of trapped air increases

D) number of molecules of trapped air increases

#31. The tendency of a body to remain at least when a force is supplied to it is called

A) impulse

A) impulse

B) momentum

B) momentum

C) inertia

C) inertia

D) friction

D) friction

#32. A ball is projected horizontally from the top of a hill with a velocity of 20m-1. If it reaches the ground 4 seconds later, what is the height of the hill? (g = 10ms-2)

A) 20m

A) 20m

B) 40m

B) 40m

C) 80m

C) 80m

D) 160m

D) 160m

E) 200m

E) 200m

#33. An alternating current, having the waveform shown in the diagram above, is represented by the equation x = Xo sinwt. Which of the following represents Xo?

A) OS

A) OS

B) OR

B) OR

C) PQ

C) PQ

D) RT

D) RT

E) OT

E) OT

#34. A simple pendulum makes 50 oscillations in one minute. What is its period of oscillation?

A) 0.02s

A) 0.02s

B) 0.20s

B) 0.20s

C) 0.83s

C) 0.83s

D) 1.20s

D) 1.20s

E) 50.00s

E) 50.00s

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