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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 2151

jamb 1986

fig 4 represents a block-and-tackle pulley system on which an effort of W newtons supports a load of 120.0N if the efficiency of the system is 40% then the value of W is

A28.0N

B48.0N

C50.0N

D288.0N

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Question 2152

jamb 1986

In an experiment in which molten naphthalene is allowed to cool, the cooling curve in fig 5 was obtained, the temperature \( 80^{\circ}C \) is known as

Acooling temperature

Bboiling point

Cmelting point

Dvaporization point

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Question 2153

jamb 1986

In fig 6, a ray of light in air strikes a glass plate at an angle of incidence 60 degrees, the reflected ray is observed to be perpendicular to the refracted ray, what is the refractive index of the glass

A1.73

B1.50

C0.87

D0.57

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Question 2154

jamb 1986

if the fig above E is an accumulator with negligible internal resistance. and the EMF 9.0V, The the total current is

A0.3A

B0.8A

C1.0A

D1.8A

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Question 2155

jamb 1986

In fig 9 the value of R is

A3Ω

B4Ω

C5Ω

D6Ω

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Question 2156

jamb 1986

When a box of mass 45kg, is given an initial speed of 5ms^-1 it slides along a horizontal floor a distance of 3m before coming to a rest. what is the coefficient of kinetic friction between the box and the floor? (G = 10ms^-2)

A\( \frac{5}{6} \)

B\( \frac{5}{12} \)

C\( \frac{1}{3} \)

D\( \frac{2}{3} \)

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Question 2157

jamb 1986

Which of the following is most strongly deflected by magnetic field?

A\(\gamma\) - rays

BX- particle

C\(\beta\) - particles

DX - rays

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Question 2158

jamb 1986

The wavelength of ultraviolet radiation is 400nm. If the speed of light in air is 3 x 10\(^8\)ms\(^{-1}\), then the frequency of the ultraviolet radiation is

A1.3 x 10¹⁵Hz

B7.5 x 10⁵Hz

C1.2 x 10¹¹Hz

D7.5 x 10¹⁴Hz

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Question 2159

jamb 1986

If the inclination at Ibadan is 7^oS, this means that

Athe angle between the geographic meridian and the magnetic meridian at Ibadan is 7^o

Bthe earth's magnetic intensity at Ibadan makes angle 7^o with the horizontal direction

Ca magnetic needle will be inclined at 7^o to the vertical at Ibadan

Dthe north pole of a magnetic needle dips downward at Ibadan

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Question 2160

jamb 1986

The sign of the change on a charged glass rod may be determined with

Aa charged electroscope

Ban uncharged electroscope

Ca galvanometer

Dan electrometer

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Question 2161

jamb 1986

The angle between the magnetic meridian and the geographic meridian at a locality on the earth is the

Alongitude of the locality

Bangle of inclination at the locality

Clatitude of the locality

Dangle of declination of the locality

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Question 2162

jamb 1986

Which of the following is true of magnetism?

AIron fillings cling mainly round the ends of a bar magnet

BThe freely suspended bar magnet comes to rest in the geographic north-south direction

CLike poles attract

DIodestone is a non-magnetic oxide

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Question 2163

jamb 1986

Which of the following is stored by a dry Leclanche cell?

AElectrical power

BKinetic energy

CElectric current

DChemical energy

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Question 2164

jamb 1986

Which of the following is NOT a part of a d.c. electric motor?

AField-magnet

BArmature

CCommutator

DTransformer

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Question 2165

jamb 1986

The vibration of an air column produces the sound in the

Apiano

Bguiter

Cflute

Dschool handbell

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Question 2166

jamb 1986

A man clapping his hands at regular intervals observes that the echo of a clap coincides with the next clap. If the reflecting cliff is 160m away and the speed of sound is 320ms^-1, what is the frequency of the clapping?

A1 Hz

B2Hz

C4Hz

D8Hz

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Question 2167

jamb 1986

Which of the following is true of the loudness of sound? It

Adepends on the square of the amplitude of the vibrating body

Bis proportional to the distance of the observer from the source of the sound

Cis greatest in vacuum

Dis dependent in vacuum

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Question 2168

jamb 1986

A wave of frequency 10Hz forms a stationary wave pattern in a medium where the velocity is 20cms-1. The distance between adjacent nodes is

A1.0cm

B1.5cm

C2.0cm

D5.0cm

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Question 2169

jamb 1986

A pencil is placed vertically between a concave mirror and its focal point. The image of the pencil in the mirror will be

Areal, inverted and diminished

Bvirtual, inverted and enlarged

Creal, erect and enlarged

Dvirtual, erect and enlarged

View Explanation & Discuss

Question 2170

jamb 1986

What is the effect of the increase in the size of the hole of a pin-hole camera on the image? it

Agives a blurred image

Bcorrects for chromatic aberration

Cmagnifies the image

Dbrings the image into a sharper focus

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