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90 questions

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Question 41

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 42

jamb 2021

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

AHydrometer

BManometer

CHygrometer

DHypsometer

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Question 43

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 44

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 45

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 46

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 47

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 48

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 49

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 50

jamb 2021

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

Adistance traveled

Buniform velocity

Cuniform acceleration

Duniform speed

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