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108 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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108 questions

Question 1 of 20 108 total questions

Question 41

jamb 1992

The angle between the direction of the earth's magnetic field and the horizontal is called the

Aangle of deviation

Bmagnetic declination

Cmagnetic meridian

Dangle of dip

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Question 42

jamb 1992

Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?

AGamma rays, ultraviolet rays, X- rays, infra - red rays

BGamma rays, X-rays, ultraviolet rays, infra-red rays

Cinfra-red rays, ultraviolet rays, X-rays, gamma rays

DGamma rays, ultraviolet rays, infra-red rays, X-rays

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Question 43

jamb 1992

If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?

A30^o

B42^o

C45^o

D50^o

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Question 44

jamb 1992

The speed of light in air is 3 x 10\(^8\)ms\(^{-1}\). What is the speed in glass with a refractive index of 1.50?

A1.5 x 10⁸ms^-1

B3.0 x 10⁸ms^-1

C2.0 x 10⁸ms^-1

D6.0 x 10⁸ms^-1

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Question 45

jamb 1992

Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?

AHe cannot see distant objects clearly

BRays of light from a close object are focused in front of his retina

CHis eye ball is too long

DParallel rays of light are focused behind his retina

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Question 46

jamb 1992

A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?

A12cm

B24cm

C48cm

D108cm

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Question 47

jamb 1992

When an object is placed very close to the pole of a concave mirror, the virtual image obtained is

Adiminished and upright

Bdiminished and inverted

Cenlarged and inverted

Denlarged and upright

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Question 48

jamb 1992

Which of the following properties make the convex mirror useful as a driving mirror? i. the image is real. ii. the image is erect. iii. it has a wide field of view. iv. the image is magnified.

Ai, ii, and iv

Bi, ii, iii

Cii and iii

Di and iii

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Question 49

jamb 1992

What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?

A80Hz

B600Hz

C800Hz

D1600Hz

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Question 50

jamb 1992

A note is the octave of another note if it has

Aa frequency twice that of the first note

Bfrequency half that of the first note

Cthe same fundamental frequency as the first one

Da frequency frequency eight times that of the first note

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Question 51

jamb 1992

Which of the following characteristics of a wave is used in the measurement of the depth of the sea?

Adiffraction

Binterference

Crefraction

Dreflection

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Question 52

jamb 1992

The equation of a wave is y = 0.005 sin[x(0.5X - 200t)] where x and y are in meters and t is in seconds. What is the velocity of the wave?

A4000ms^-1

B400ms^-1

C250ms^-1

D40ms^-1

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Question 53

jamb 1992

The space between the double glass walls of a thermos flask is evacuated space are silvered. The residual source of heat loss takes place by

Aconvection

Bradiation from the surface

Cconduction through the stopper and the glass

Dconduction across the walls

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Question 54

jamb 1992

A block of ice floats on water inside a container. If the block of ice gets completely melted, the level of water in the container will

Aincrease

Bremain the same

Cdecrease

Dfirst decrease and then increase

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Question 55

jamb 1992

How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg^-1K^-1 is heated from 20^oC to 70^oC?

A39 . 98 x 10^-1J

B9.75 x 10²J

C3.98 x 10³J

D9.75 x 10³J

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Question 56

jamb 1992

At constant pressure, the density of a fixed mass of gas is

Aconstant with temperature

Bproportional to its volume

Cinversely proportional to its temperature

Dindependent of its volume

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Question 57

jamb 1992

One of the most important applications of bi-metallic strip is found in the construction of

Aa thermostat

Ban altimeter

Ca thermocouple

Da hydrometer

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Question 58

jamb 1992

A bridge made of steel is 600m long. What is the daily variation in its length if the night-time and daytime temperatures are 10°C and 35°C respectively. The linear expansivity of steel is 0.000012C\(^{-1}\).

A0.18cm

B1.80cm

C18.00cm

D1800cm

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Question 59

jamb 1992

A platinum resistance thermometer wire has a resistance of 5 ohms at 0^oC and 5.5 ohms at 100^oC. Calculate the temperature of the wire when the resistance is 5.2 ohms

A80^oC

B60^oC

C40^oC

D10^oC

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Question 60

jamb 1992

If a plastic sphere floats in water (density = 1000kgm3) with 0.5 of its volume submerged, and floats in oil with 0.4 of its volume submerged the density of the oil is

A800kgm³

B1200kgm³

C1250kgm³

D2000kgm³

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