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1,904 questions

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Question 141

waec 2020

A beam consisting of \(\alpha\)-particles. \(\beta\)-particles and \(\gamma\)-rays pass through a magnetic field at right angles to the direction of the field. Which of the following observations would be made about the \(\alpha\)-particles, \(\beta\)-particles, and \(\gamma\)-rays respectively?

ADeflected, deflected, deflected

BDeflected, deflected, not deflected

CDeflected, not deflected, deflected

DNot deflected, deflected, deflected

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Question 142

waec 2020

A moving-coil galvanometer which gives a full-scale on deflection with 0.005A is converted to a voltmeter reading up to 5V using an external resistance of 975\(\Omega\). What is the resistance of the metre?

A0.25\(\Omega\)

B2.50\(\Omega\)

C25.00\(\Omega\)

D250.00\(\Omega\)

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Question 143

waec 2020

The length of an iron bar is 100cm at 20°C. At what temperature will its length increase by 0.01%? [Linear expansivity of iron = 1.2 x 10\(^{-5}\)°C]

A48.0°C

B38.0°C

C28.3°C

D23.0°C

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Question 144

waec 2020

A 60kg man stands on a weighing balance in an elevator. If the elevator accelerates upwards at 5ms\(^{-2}\), determine the reading of the scale. [g = 10ms\(^{-2}\)]

A300N

B600N

C800N

D900N

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Question 145

waec 2020

A ray of light traveling from glass into ethyl alcohol is incident at the boundary at an angle of incidence 30\(^o\). Calculate the angle of refraction.

[Refractive index of glass =1.5; refractive index of ethyl alcohol = 1.36]

A27\(^o\)

B33.5\(^o\)

C51.7\(^o\)

D72.8\(^o\)

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Question 146

waec 2020

Two identical cups containing the same volume of water at 45°C and 5°C, are left in a room at 25°C. Which of the following graphs correctly illustrates the variation of temperature with time?

Two identical cups containing the same volume of water at 45°C and 5°C, are left in a room at 25°C. Which of the following graphs correctly illustrates the variation of temperature with

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Question 147

waec 2020

The earpiece of a telephone handset converts energy from

Aelectrical to sound

Bsound to electrical

Csound to electrical

Dsound to radio wave

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Question 148

waec 2020

An electrical device has 50 turns in its primary coil and 20 turns in the secondary coil. The device can be a\an?

Astep-up transformer

Bstep-down transformer

Cd.c generator

Da.c generator

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Question 149

waec 2020

The diagram above illustrates a beam of parallel rays from a distant object O, incident on one side of the total reflecting prism. Which diagram does not represent the correct path of the beam when it emerges from the prism?

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Question 150

waec 2020

Which of the following statements explain why hot soapy water is more effective in cleaning oil-stained dishes?

AThe oil on the dishes repels the soap

Bsoap and heat decrease the surface tension of oil

Csoap increases the surface tension of oil and water

DHot water increases the surface tension of oil

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Question 151

waec 2020

The material used to slow down the neutrons in a nuclear reactor is

Aboron

Bcopper

Cgraphite

Duranium

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Question 152

waec 2020

The depolarising agent in a Leclanche cell is?

Acarbon rod

Bammonium chloride

Cmanganese (IV) oxide

Dzinc plate

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Question 153

waec 2020

Which of the following waves requires a material medium for its propagation?

ARadio waves

BLight waves

CSound waves

DX-rays

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Question 154

waec 2020

The average distance moved by a molecule between collisions is called

Amolecular distance

Bintermolecular distance

Cmean distance

Dmean free path

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Question 155

waec 2020

Which of the following machines does not apply the lever principle?

AClaw hammer

BWheelbarrow

CSingle pulley

Dsugar tong

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Question 156

waec 2020

How would the capacitance of a parallel plate capacitor be affected if the distance of separation of its plates is decreased? It will

Aincrease in value

Bdecrease slightly

Cremain unchanged

Ddrop to zero

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Question 157

waec 2020

An image formed on a screen is always?

Ainverted

Bmagnified

Cupright

Dvirtual

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Question 158

waec 2020

The volume of a fixed mass of a gas varies inversely as the pressure on it provided the temperature is constant. This statement is

APressure law

BCharles law

CBoyle's law

DGeneral gas law

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Question 159

waec 2020

The quantity of motion of a body is its

Aacceleration

Bdisplacement

Cmometum

Dvelocity

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Question 160

waec 2020

In collision between two objects, kinetic energy is conserved only if

Aone of the objects was initially at rest

Bpotential energy is converted to work

Cthe collision is inelastic

Dthe collision is elastic

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