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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 2161

jamb 1986

A dentist obtains a linear magnification of 4 of a hole in a tooth by placing a concave mirror at a distance, of 2.0cm from the tooth. The radius of Curvature of the mirror is

A5.3cm

B3.2cm

C2.7cm

D1.6cm

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Question 2162

jamb 1986

If the refractive index of glass is 1.5, what is the critical angle at the air-glass interface?

Asin^-1\(\frac{1}{2}\)

Bsin^-1\(\frac{2}{3}\)

Csin^-1\(\frac{3}{4}\)

Dsin^-1\(\frac{8}{9}\)

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Question 2163

jamb 1986

In which of the following arrangements is the wavelength in an increasing order?

AGamma rays, infra-red rays, x-rays, radiowaves

BGamma rays, x-rays, infra-red ray, radiowaves

CRadiowaves, x-rays, gamma ray, infra-red rays

DInfra-red rays, radiowaves, x-rays, gamma rays

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Question 2164

jamb 1986

A lens of focal length 12.0cm forms an upright image three times the size of a real object. The distance between the object and the images is

A8.0cm

B16.0cm

C24.0cm

D32.0cm

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Question 2165

jamb 1986

Which of the following is true of sounds?

Asound travels faster in air at 20^oC than at 30^oC

Bthe frequency of a given sound wave changes when it crosses the boundary seperating two media

Cthe wavelength of a given sound wave in air decreases as the temperature increases

Dsound waves cannot be reflected

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Question 2166

jamb 1986

When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The mass of P is half that of Q. The ratio of the specific heat capacity of P to Q is

A1 : 4

B4 : 1

C1 : 1

D2 : 1

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Question 2167

jamb 1986

A gas occupies a volume of 300cm³at a temperature of 27^oC. What is its volume at 54^oC, when the pressure is constant?

A150cm³

B273cm³

C327cm³

D600cm³

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Question 2168

jamb 1986

Which of the following properties makes metals ideal for cooking utensils?

Ahigh coefficient of expansion

Bgood conduction of heat

Clow specific heat capacity

Dpoor radiation of heat

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Question 2169

jamb 1986

Mercury is suitable as a barometric fluid because it?

Aexpands uniformly

Bis opaque

Cis several times denser than water

Dis a good conductor of heat

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Question 2170

jamb 1986

Which of the following is common to evaporation and boiling? They

Atake place at any temperature

Bare surface phenomena

Cinvolve change of state

Dtake place at a definite pressure

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Question 2171

jamb 1986

The specific latent heat of fusion of lead is the amount of heat required to

Amelt lead at its melting point

Bheat a unit mass of lead through 1^oC

Cchange the state of a unit mass of lead at its melting point

Dchange the state of a unit mass of lead at its boiling point

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Question 2172

jamb 1986

The expansion of solids can be considered a disadvantage in the?

Abalance wheel of a watch

Bfitting of wheels on rims

Cfire alarm

Dthermostat

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Question 2173

jamb 1986

The mode of heat transfer which does not require a material medium is

Aconduction

Bradiation

Cconvection

Dpropagation

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Question 2174

jamb 1986

A 1000kg elevator is descending vertically with an acceleration of 1.0ms-2, if the acceleration due to gravity is 10ms-2, the tension in the suspending cable is

A1.0N

B10.0N

C9000.0N

D11 000N

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Question 2175

jamb 1986

A rectangular tank contains water to a depth of 2m, if the base is 4m x 3m, calculate the force on the base (Density of water = 10³kgm^-3, g = 10ms^-2)

A1.4 x 10²N

B24 x 10⁴N

C2.0 x 10⁴N

D1.7 x 10³N

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Question 2176

jamb 1986

A constant force of magnitude F acts on an object of mass 0.04kg initially at rest at a point O. if the speed of the object when it has moved 50m from O is 500ms^-1, what is the value of F?

A0.4N

B100.0N

C250.0N

D1000.0N

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Question 2177

jamb 1986

Which of the following assumptions is made in a simple pendulum experiment? the

Asuspending string is inextensible

Bbob has a finite size

Cbob has a definite mass

Dinitial angle of oscillation must be large

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Question 2178

jamb 1986

A ball is thrown vertically into the air with an initial velocity u. What is the greatest height reached?

Au2g

B\(\frac{3u^2}{2g}\)

C\(\frac{u^2}{g}\)

D\(\frac{u^2}{2g}\)

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Question 2179

jamb 1986

Which of the following is in a neutral equilibrium?

Aa heavy weight suspended on a string

Ba cone resting on its slant edge

Ca heavy-based table lamp

Dthe beam of a balance in use

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Question 2180

jamb 1986

Two objects, one having three times the mass of the other, are dropped at the same time from a tall building. When they are above the ground, the two objects will have the same?

AMomentum

BKinetic energy

CPotential energy

DAcceleration

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