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107 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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Past Questions

107 questions

Question 1 of 20 107 total questions

Question 1

waec 1990

Which of the following is not an evidence of the particle nature of matter?

ADiffusion

BBrownian motion

CDiffraction

DCrystal structure

EPhotoelectricity

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Question 2

waec 1990

What is the difference between a crystalline and an amorphous solid? A crystalline solid

Ahas cubic structure while amorphous solid has hexagonal structure

Bhas regularly-repeating pattern while an amorphous solid has not

Cis white while amorphous solid is yellow

Dis always hard while amorphous solid is always soft

Emelts on heating while an amorphous solid sublimates on heating.

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Question 3

waec 1990

Which of the following is not crystal?

ASodium chloride

BLead

CCopper (II) tetraoxosulphate (VI)

DGlass

EGermanium

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Question 4

waec 1990

Viscosity in a liquid does not depend on the

Anature of the liquid

Brelative velocity between the liquid layers

Carea of the surfaces in contact

Dtemperature of the liquid

Enormal reaction between the liquid layers

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Question 5

waec 1990

A metal is illuminated with a radiation of energy 6.88eV If the kinetic energy of the emitted electrons is 1.5OeV, calculate the work function of the metal.

A0.22eV

B4.59eV

C5.38eV

D8.38eV

E10.32eV

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Question 6

waec 1990

A radioactive substance has a half-life of 20 hours. What fraction of the original radioactive nuclei will remain after 80 hours?

A1/32

B1/16

C1/8

D1/4

E1/2

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Question 7

waec 1990

Water does not drip through an open umbrella of silk material unless the inside of the umbrella is touched. Which of the following phenomena is responsible for this?

ASurface tension

BHydrostatic upthrust

CViscosity

DDiffusion

EOsmosis

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Question 8

waec 1990

The nucleon number and the proton number of a neutral atom of an element are 238 and 92 respectively. What is the number of neutrons in the atom?

A330

B165

C146

D119

E73

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Question 9

waec 1990

Which of the following statements about the atom is/are correct? I. Energy is needed to remove electrons from an atom II. Particles in the nucleus of an atom are bound together by strong forces. III. A large amount of energy is required to separate the particles in the nucleus of an atom. IV. When the nucleus of a uranium atom is split, the energy released accounts for the difference in the masses of the products and the parent nucleus

AI only

BI and II only

CI and III only

DII and IV only

EI, II, III and IV

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Question 10

waec 1990

When the pressure of the gas in a discharge tube is gradually lowered. I. there is a violet glow in the tube II. the glow in the tube splits into bands which get further apart. III, the glow and the bands eventually disappear and there is a green fluorescence in the tube. IV. the tube breaks into pieces. Which of the following are correct?

AI and II only

BI and III only

CI and IV only

DI, II and III only

EI, II III and IV

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Question 11

waec 1990

Which of the following particles conduct electricity through salty water?

AAtom

Bmolecules

CElectrons

DNeutrons

EIons

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Question 12

waec 1990

Which of the following reduce(s) the effect of the back e.m.f. generated in the primary coil of an induction coil? The capacitor in the circuit II. The make and break contact in the circuit III. The ratio of turns in the secondary to that in the primary

Al only

BII only

CI and II only

DII and III only

EI, II and III.

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Question 13

waec 1990

How long will it take to heat 3 kg of water from 28^oC to 88^oC in an electric taking a current of 6 A from an e.m.f. source of 220V?

A96s

B1.20s

C570s

D600s

E1200s

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Question 14

waec 1990

A rectangular coil of wire can rotate in a magnetic field. The ends of the coil are soldered to the two halves of a split ring. Two carbon brushes are made to press lightly against the split ring and when these are connected in circuit with a battery and rheostat, the coil rotates. This is a description of

Aa suspended- coil vanometer

Ba moving-cell ammeter

Ca d.c generator

Dan electric motor

Ean induction coil,

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Question 15

waec 1990

A cell of e.m.f. 1.5 V and internal resistance of 2.59 is connected in series with an ammeter of resistance 0.59 and a resistor of resistance 7.09. Calculate the current in the circuit.

A0.15 A

B0.20 A

C0.60A

D3.00A

E6.67 A.

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Question 16

waec 1990

Birds can perch safely on overhead electric power cables without being electrocuted because

Abirds can withstand high p.d. of the electric power cables

Bany accumulated charge on the birds is quickly dissipated

Cthe feet of the birds are well insulated

Dthe current is a.c. and has particular direction

Ethere is no p.d between the birds and the cables

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Question 17

waec 1990

Calculate the resistance of the filament of a lamp rates 240 V, 40 W

A240Ω

B360Ω

C720Ω

D1440Ω

E2880Ω

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Question 18

waec 1990

If the frequency of the ac. circuit illustrated above is 500/π Hz what would be the reactance in the circuit?

(Inductance (L) = 0.9H, Capacitance (C) = \(2 \times 10^{-6}\)

A0.0009Ω/π

B100Ω

C1030Ω

D400Ω

E2500Ω

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Question 19

waec 1990

A charge of 1.0 x 10^-5 Coulombs experience force of 40N at a certain point in space. What is the electric field intensity?

A8.00 x 10⁶NC^-1

B4.00 x 10⁶NC^-1

C4.00 x 10^-4NC^-1

D2.00 x 10^-4NC^-1

E2.50 x 10^-1NC^-1

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Question 20

waec 1990

What is the value of R when G shows no deflection in the circuit illustrated above?

A80Ω

B75Ω

C45Ω

D20Ω

E10Ω

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