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1,904 questions

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Question 841

waec 1992

Which of the following instruments is used to measure relative humidity?

AHydrometer

BBarometer

CManometer

DHypsometer

EHygrometer

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Question 842

waec 1992

A small circular membrane is 10cm below the surface of a pool of mercury when the barometric height is 76 cm of mercury. If the density of mercury is 13600\(kgm^{-3}\), what is the pressure on the membrane in \(Nm^{-2}\)? \((g =10ms^{-2})\)

A1.17 x 10⁷ Nm^-2

B6.80 x 10⁵Nm^-2

C1.17x10⁵Nm^-2

D1.03 x 10⁵Nm^-2

E1.36 x10⁴ Nm^-2

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Question 843

waec 1992

Which of the following best explains why a person suffers a more severe burn when his skin is exposed to steam than when boiling water pours on his skin?

ASteam is at a higher temperature than boiling water

BSteam possesses greater heat energy per unit mass than boiling water

CSteam spreads more easily over a wider area of the skin man boiling water

DSteam penetrates more deeply into the skin than boiling water

Ethe specific latent heat of vaporization is released in changing from boiling water to steam

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Question 844

waec 1992

A gas which obeys Charles’ law exactly has a volume of 283cm3 at 10oC. What is its volume at 30oC?

A142cm³

B293cm³

C303cm³

D566cm³

E849cm³

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Question 845

waec 1992

Which of the following colours of surfaces will radiate heat energy best?

ARed

BWhite

CBlack

DYellow

EBlue

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Question 846

waec 1992

A given mass of gas at a temperature of 30°C is trapped in a tube of volume V. Calculate the temperature of the gas when the volume is reduced to two-third of its original value by applying a pressure twice the original value.

A71^oC

B40^oC

C131^oC

D313^oC

E404^oC

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Question 847

waec 1992

Which of the following statements is/are correct? I. Pure water freezes at 0ºC under normal pressure ll. Water has its highest density at 4ºC. III. The volume is highest at 4ºC,

AI only

BII only

CI and II only

DI and III only

EII and III only

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Question 848

waec 1992

Steel bars, each of length 3.0 m at 28°C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10^-5°C, what is the safety gap that must be left between successive bars if the highest temperature expected is 40^oC?

A1.2 x 10^-1cm

B8.4 x 10^-2cm

C7.2 x10^-2cm

D3.6 x 10^-2cm

E1.8 x 10^-2cm

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Question 849

waec 1992

A body of mass 5kg falls from a height of 10m above the ground. What is the kinetic energy of the body just before it strikes the ground? (Neglect energy losses and take gravity as 10ms^2)

A5J

B25J

C250J

D500J

E625J

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Question 850

waec 1992

A barometer can be used in determining the I. height of a mountain II. depth of a mine III. dew point. Which of the following is/are correct?

AI, II and III

BII and III only

CI and III only

DI and II only

EIII only

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Question 851

waec 1992

A force of 20 N applied parallel to the surface of a horizontal table, is just sufficient to make a block of mass 4kg move on the table. Calculate the coefficient of friction between the block and the table. (g = 10ms²)

A0.05

B0.20

C0.50

D0.80

E2.00

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Question 852

waec 1992

Which of the following will reduce the frequency of oscillation of a simple pendulum?

AIncreasing the mass of the bob

BDecreasing the mass of the bob

CIncreasing the length of the string

DDecreasing the length of the string

EIncreasing the amplitude of oscillation

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Question 853

waec 1992

Solid weighs 0.040 N in air and 0.024 N when fully immersed in a liquid of density 800 kg m^-3. What is the volume of the solid? (g = 1Oms²)

A2.0 x 10^-6m³

B2.5x10^-6m³

C3.0x10^-6m³

D2.0x 10^-5m³

E3.0 x 10^-5m³

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Question 854

waec 1992

Which of the following has the same unit as the moment of a force?

AForce

BPower

CWork

DMomentum

EImpulse

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Question 855

waec 1992

A body accelerates uniformly from rest at the rate of 3 m/s\(^2\) for 8 seconds. Calculate the distance covered by the body during the acceleration?

A12m

B24m

C48m

D72m

E96m

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Question 856

waec 1992

Which of the following statements about solid friction is/are correct? I. Friction depends on the nature of the surfaces in contact II. Friction depends on the area of contact III. Friction always acts in the direction of motion.

AI only

BII only

CIII only

DI and II only

EI,II and III

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Question 857

waec 1992

What change in velocity would be produced on a body of mass 4kg if a constant force of 16 N acts on it for2 s?

A0.5 ms^-1

B2.0ms^-1

C8.0 ms^-1

D32.0 ms^-1

E128.0 ms^-1

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Question 858

waec 1992

The diagram above represents the trajectory of a projectile with an initial velocity U. Calculate the time taken to reach the maximum height. (Take g as acceleration due to gravity)

AUsinθ/2g

B2Usinθ/g

CUcosθ/g

D2Ucosθ/g

EUsinθ/g

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Question 859

waec 1992

Which of the following is a scalar quantity?

AMomentum

BAcceleration

CDisplacement

DDistance

EForce

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Question 860

waec 1991

Which of the following has the highest surface tension?

Acold water

Bsoapy water

Cwarm water

Doily water

Esalty water

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