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Past Questions

77 questions

Question 1 of 20 77 total questions

Question 1

waec 1989

The electric force between two point charges each of the magnitude, q at a distance of r apart in air of permittivity is:

Aq²/4πεr

Brε₀/q²

C4πq/ε₀

Dqr²/ε₀

E\(\frac{q^2}{4\piεor^2}\)

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Question 2

waec 1989

Calculate the escape velocity for a rocket fired from the earth's surface at a point where the acceleration due to gravity is 10ms^-2 and the radius of the earth is 6 x 10⁶m.

A7.8 x 10⁶ms^-12

B1.1 x 10⁴ms^-1

C3.5 x 10⁷ms^-1

D6.0 x 10⁷ ms^-1

E1.2 x 10⁸ms^2-1

View Explanation & Discuss

Question 3

waec 1989

What is the gravitational potential due to a molecule of mass, m and at a distance, r from it? (G = gravitational constant).

AGm²/r²

BGm/r

CGm²/r

DG²m²/r

Em²/Gr²

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Question 4

waec 1989

Which of the following is not a property of longitudinal waves?

Acompression

Breflection

Crefraction

Dpolarization

Ediffraction

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Question 5

waec 1989

A string is stretched between two points 50cm apart. It is then plucked at its center and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in 1s.

C150

D300

E600

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Question 6

waec 1989

In a wave the maximum displacement of particles from their equilibrium positions is called.

Afrequency

Bamplitude

Cperiod

Dwavelength

Ewave velocity

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Question 7

waec 1989

A sound pulse sent vertically downwards into the earth is reflected from two different layers of the earth such that echoes are heard 1.2s and 1.4s. Assuming speed of the pulse is 2000ms^-1, calculate the distance between the layers.

A200 m

B400 m

C2400 m

D2600 m

E2800 m

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Question 8

waec 1989

Which of the following is a stringed instrument?

Aflute

Btrumpet

Cpiano

Ddrum

Esaxophone

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Question 9

waec 1989

The distance between a node and an anti-node for a transverse wave is equal to

Athe wavelength

Bthrice the wavelength

Cone-half of the wavelength

Done-quater of the wavelength

Ethree quaters of the wavelength

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Question 10

waec 1989

The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium?

A30^o

B36^o

C44^o

D46^o

E54^o

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Question 11

waec 1989

The image in a pine-hole camera is always

Adiminished

Benlarged

Cupright

Dinverted

Eblurred

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Question 12

waec 1989

A ray of light is incidence on a plane mirror at an angle of 35^o. What is the angle by the reflected ray with the surface of the mirror?

A125^o

B70^o

C65^o

D55^o

E35^o

View Explanation & Discuss

Question 13

waec 1989

A short chain is usual attached to the back of a petrol tanker trailing behind it to ensure that the

Apetrol tanker is balanced on the wh eel

Bheat generated by friction in the engine can be conducted to the floor

Ccharges generated by friction in the tanker can be conducted to the earth

Dthe tanker moves slowly as the chain touches the floor

Echain produces sound for the resonance of the tanker engine

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Question 14

waec 1989

Which of the following instruments can be used to compare the relative magnitudes of charges on two given bodies?

AThe electrophorous

BEbonite rod

CProof plane

DGold leaf electroscope

ECapacitor

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Question 15

waec 1989

All the heat generated by a current of 2A passing through a resistor of 6Ω for 25s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?

A60 Jg^-1

B120 Jg^-1

C300 Jg^-1

D360 Jg^-1

E1500 Jg^-1

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Question 16

waec 1989

A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?

Athe reaction force of the table on the ice breaks the ice into water molecules

Bheat extracted from the ice block makes the ice block cold

Cthe ice block absorbs heat from the atmosphere and its temperature rises

Dthe atmosphere absorbs heat from the ice block and its temperature falls

Ethe ice block absorbs heat from the atmosphere and its temperature remains constant as it melts

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Question 17

waec 1989

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

A533000J

B230000J

C117200J

D113000J

E4200J

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Question 18

waec 1989

Which of the following substance is not a good conductor of electricity?

AHuman body

BGlass

CAluminium

DEarth

ECopper

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Question 19

waec 1989

Water in an open container boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of a mountain the

Arelative humidity is higher than at sea-level

Brays of the sun adds more heat to the water

Ctemperature is lower than that at sea-level

Dpressure is lower than that at sea-level

Epressure is more than that at sea-level

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Question 20

waec 1989

Which of the following statements is/are not correct?

AEvaporation takes place only at the surface of the liquid

BBoiling takes place throughout the volume of the liquid

CEvaportaion takes place at all temperatures

DBoiling takes place at a particular temperature for a liquid at a fixed external pressure

EThe boiling point of a liquid is not affected by impurities

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