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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 1891

waec 1992

Which of the following is used for controlling the amount of light entering the eye?

ACornea

BPupil

CIris

DOptic nerve

ECiliary muscle

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Question 1892

waec 1992

When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.5om. What is the distance between the lenses?

A20.0cm

B47.5cm

C50.0cm

D52.5cm

E125.0cm.

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Question 1893

waec 1992

The eye defect illustrated in the diagram above can be corrected by a

Aconvex mirror

Bconcave mirror

Cdiverging lens

Dconverging lens

Epiano-converging lens

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Question 1894

waec 1992

A real image of an object fom1ed by a converging lens of focal length 15cm is three times the size of the object. What is the distance of the object from the lens?

A30cm

B25cm

C20cm

D15cm

E10cm

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Question 1895

waec 1992

As an object is moved close to the focus of a converging lens from infinity its image I. moves closer to the lens II. moves away from the lens. III. Remains the same size. IV becomes smaller. Which of the statements above is/are correct?

AIII and IV only

BI and III only

CIV only

DIII only

EII only

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Question 1896

waec 1992

The image of a pin formed by a diverging lens of focal length 10cm is 5cm from the lens. Calculate the distance of the pin from the lens

A-3.3cm

B3.3cm

C10.0cm

D15.0cm

E20.0cm

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Question 1897

waec 1992

In an experiment to measure1 the focal length f of a converging lens object distances u and corresponding image distance were measured and 1/u plotted against 1/v to obtain the graph illustrated. How would f be determined from this graph?

Af= the slope of the graph

Bf= the intercept on the 1/u axis

Cf =the intercept on the 1/v axis

Df = reciprocal of the slope

Ef = reciprocal of the intercept on either axes

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Question 1898

waec 1992

Which of the following statements is not correct for a light ray passing through a rectangular glass block which is surrounded by air? It

Asuffers a displacement at the point of emergence

Bemerges parallel to the incident ray

Cis partly reflected at the point of incidence

Dis deviated at the point of emergence

Eis reflected in the block

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Question 1899

waec 1992

Images formed by a convex mirror are always

Ainverted, real and diminished

Binverted, virtual and diminished

Cerect, virtual and diminished

Derect, real and magnified

Eerect, virtual and magnified

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Question 1900

waec 1992

A ray of light strikes a plane mirror at an angle of incidence i. Determine in terms of i the angle of deviation of the ray after reflection from the mirror.

B2i

C90^o-i

D90^o+ i

E180^o - 2i

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Question 1901

waec 1992

A metal of mass 1.5 kg was heated from 27^oC to 47^oC in 4 minutes by a boiling ring of 75 W rating. Calculate the specific heat capacity of the metal, (Neglect heat losses to the surrounding)

A2.5 X10³J kg^-10C^-1

B6.0 X10²J kg^-10C^-1

C2.5 x 10²J kg^-10C^-1

D1.4 X10²J kg^-10C^-1

E1.0 x 10²J kg^-10C^-1

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Question 1902

waec 1992

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

AHydrometer

BBarometer

CManometer

DHypsometer

EHygrometer

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Question 1903

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 1904

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 1905

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 1906

waec 1992

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

ARed

BWhite

CBlack

DYellow

EBlue

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Question 1907

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 1908

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 1909

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 1910

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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