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4,719 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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4,719 questions

Question 1 of 20 4,719 total questions

Question 321

jamb 2021

Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23jg\(^{-1}\)k\(^{-1}\) (specific latent heat of vaporization of water is 2260jg\(^{-1}\)

A530000J

B23200J

C17200J

D130000J

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Question 322

jamb 2021

Which of the following is not a vector quantity?

Amomentum

Bforce

Ctemperature

Ddisplacement

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Question 323

jamb 2021

A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms\(^{-1}\), how far is he from the cliff?

A680m

B170m

C34m

D85m

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Question 324

jamb 2021

A source of sound produces waves in air of wavelength 1.65m. If the speed of sound in air is 330ms\(^{-1}\), the period of vibration in air is?

A200

B0.005

C0.5

D0.02

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Question 325

jamb 2021

Which of the following instruments may be used to measure relative humidity?

AHydrometer

BManometer

CHygrometer

DHypsometer

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Question 326

jamb 2021

0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg\(^{1}\) Cº. Calculate the specific latent heat of fusion of ice.

A9.0kjkg\(^{-1}\)

B84.0kjkg\(^{-1}\)

C134.0kjkg\(^{-1}\)

D168.0kjkg\(^{-1}\)

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Question 327

jamb 2021

A given mass of gas has a pressure of 80 Nm\(^{-2}\) at a temperature of 47 C. If the temperature is reduced to 27 C with volume remaining constant, the new pressure is?

A46.0 Nm\(^{-2}\)

B75.0 Nm\(^{-2}\)

C80.0 Nm\(^{-2}\)

D85.3 Nm\(^{-2}\)

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Question 328

jamb 2021

Which of the following is not correct about the molecules of a substance in a gaseous state. They?

Aare in a constant state of motion

Bhave different speeds

Chave a temperature which is measured by the average kinetic energy

DThe collision between the gases is perfectly inelastic

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Question 329

jamb 2021

The motion of a body is simple harmonic if the?

Aacceleration is always directed towards a fixed point

Bpath of motion is a straight line

Cacceleration is proportional to the square of the distance from a fixed point

Dacceleration is constant and directed towards a fixed point

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Question 330

jamb 2021

A ball of mass 0.5kg moving at 10ms\(^{-1}\) collides with another ball of equal mass at rest. If the two balls move off together after the impact, calculate their common velocity.

A0.2ms\(^{-1}\)

B0.5ms\(^{-1}\)

C5.0ms\(^{-1}\)

D5.5ms\(^{-1}\)

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Question 331

jamb 2021

Which of the units of the following physical quantities are derived?

I. Area
II. Thrust
III. Pressure
IV. Mass

AI, II, III and IV

BI, II, and III only

CI, II, and IV only

DI and IV only

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Question 332

jamb 2021

A man will exert the greatest pressure when he?

Alies flat on his back

Blies on his belly

Cstands on both feet

Dstands on the toes of one foot

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Question 333

jamb 2021

The slope of the straight line displacement-time graph indicates?

Adistance traveled

Buniform velocity

Cuniform acceleration

Duniform speed

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Question 334

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 335

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 336

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 337

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 338

waec 2020

Which of the following units is not fundamental?

AMetre

BKilogram

CJoule

DCandela

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Question 339

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 340

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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