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1,904 questions

Question 1 of 20 1,904 total questions

Question 121

waec 2021

Which of the sketched graphs above illustrates the correct variation of the gravitational force, Fg between two objects and the distance, d, between the centre

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Question 122

waec 2021

The distance between a node and its adjacent antinode of a transverse wave is equal to?

Ahalf of the wavelength.

Bthe wavelength.

Cthrice the wavelength.

Dquarter of the wavelength.

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Question 123

waec 2021

Which of the following statements about the molecules of solids and liquids is correct? They both

A have weak attraction.

B have wide separations.

C exhibit random motion.

D exhibit vibratory motion.

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Question 124

waec 2021

Electric motor primarily converts?

Aelectrical energy to chemical energy.

Bkinetic energy to potential energy

Celectrical energy to mechanical energy

Delectrical energy to heat energy.

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Question 125

waec 2021

A heat sensitive resistor made of a semiconductor is called?

Athermometer.

Bthermostat.

Cthermistor

Dthermopile.

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Question 126

waec 2021

Opening in the eye through which light passes to the retina is called the?

Apupil

Bcornea.

C iris

Doptic nerve.

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Question 127

waec 2021

Which of the following factors does not affect the rate of evaporation of a liquid?

Atemperature

Bvolume

Cwind

Dsurface area

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Question 128

waec 2021

Formation of hydrogen bubbles at the copper plate of a primary cell is called?

Apolarization.

B back e.m.f.

C electrolysis.

D local action.

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Question 129

waec 2021

The reason for laminating the soft iron core of a transformer is to?

Areduce eddy current.

B reduce magnetic flux.

Cincrease the magnetic flux.

D reduce its efficiency.

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Question 130

waec 2021

Which of the following quantities is not an example of force?

AMass

BTension

CWeight

D Friction

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Question 131

waec 2020

Which of the following statement about viscosity is not true? it

Adepends on areas of the surfaces in contact

Boccurs in fluids

Cis independent of the relative velocity of the layers

Ddepends on the tangential force between the layers

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Question 132

waec 2020

When two cells of negligible internal resistances and equal e.m.f. denoted by E\(_1\) and E\(_2\) are connected in parallel, combined e.m.f. E is given by

AE = E\(_1\) + E\(_2\)

B\(\frac{1}{E} = \frac{1}{E_1} + \frac{1}{E_2}\)

CE = E\(_1\) = E\(_2\)

DE = \(\frac{E_1}{E_2}\)

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Question 133

waec 2020

In photoelectric effect, the number of electrode emitted per second from a metallic surface is proportional to the

Aintensity of the incident radiation

Bfrequency of the incident radiation

Cenergy of the incident radiation

Dwork function of the metal.

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Question 134

waec 2020

The vacuum between the double walls of a thermos flask reduces heat loss through

Aconduction and radiation

Bconvection and conduction

Cradiation only

Dconduction only

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Question 135

waec 2020

Which of the following units is not fundamental?

AMetre

BKilogram

CJoule

DCandela

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Question 136

waec 2020

A luminous object is one that

Agives off dim blue-green light only in the dark.

Bgives out light of its own

Cshines by reflected light only

Dglows only in the presence of light

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Question 137

waec 2020

Which of the following actions would increase the electric force between two positively charged particles?

ADecreasing the mass of the particles

BDecreasing the distance between the particles

CIncreasing the assistance between the particles

DIncreasing the mass of the particles

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Question 138

waec 2020

A diver steps off a diving platform that is 10m above the water. If there is no air resistance during the fall, there will be a decrease in the diver's

Agravitational potential energy

Btotal mechanical energy

Ckinetic energy

Dmomentum

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Question 139

waec 2020

Which of the following statements about the process of melting of a solid are true? The temperature of the solid will

I. remain steady until melting starts.

ll. keep rising until melting starts,

Ill remain steady as melting proceeds.

V, keep rising as melting proceeds.

AI and llI only

BIlI and IV only

CIl and Ill only

Dll and IV only

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Question 140

waec 2020

An electron of mass 9.1x 10\(^{-31}\) kg is travelling at a speed of 2.0 x 10\(^6\)ms\(^{-1}\). Calculate the associate wavelength of the electron. [h = 6.6. x 10\(^{-34}\) Js]

A3.63 x10\(^{-10}\) m

B3.63 x 10\(^{-8}\) m

C3.63 x 10\(^{-7}\) m

D6.89 x 10\(^{-4}\) m

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