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4,719 questions

Question 1 of 20 4,719 total questions

Question 2101

waec 1988

When three coplanar and non-parallel forces are in equilibrium,
I. they can be represented in magnitude and direction by the three sides of a triangle taken in order.
II. their lines of action meet at a point.
III. the magnitude of anyone equals the magnitude of the resultant of the other two.
IV. any one force is the equilibrant of the other two.

Which of the following statements above are correct?

AI & II only

BII & III only

CII, III & IV only

DI, II, III & IV

EI, III & IV only

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Question 2102

waec 1988

A man will exact the greatest pressure on a bench when he

Alies flat on his back

Blies flat on his belly

Cstand on both feet

Dstand on one foot only

Estand on toes of one foot

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Question 2103

waec 1988

The slope of a striaght line displacement time graph indicates the

ADistance travelled

BUniform velocity

CUniform acceleration

DInstantaneous acceleration

EUniform speed

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Question 2104

waec 1988

Which of the units of the following physical quantities are derived? I. Area II. Thrust III. Pressure IV. Mass

AI, II, III & IV

BI, II, III only

CI, II, IV only

DI, & III only

EI & IV only

View Explanation & Discuss

Question 2105

jamb 1988

A particle is injected perpendicularly into an electric field, it travels along a curved path as depicted in the image above,the particle is

Agamma ray

Belectron

Cneutron

Dproton

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Question 2106

jamb 1988

In the circuit diagram above, the ammeter reads a current of 3A when R is 5 ohms and 6A when R is 2ohms, the value of the unknown resistance X is

View Explanation & Discuss

Question 2107

jamb 1988

The wire X in the figure above is at right angles to the plane of the paper and carries a current into the paper. at which of the points labelled 1-4, will the magnetic flux density due to this current be in the same direction as that of the horizontal component of earth's magnetic field

View Explanation & Discuss

Question 2108

jamb 1988

E,F and G are yellow, red and cyan transparent light filters respectively. The color of a white opaque object when viewed through the arrangement of the filters above is

Ayellow

Bred

Cblack

Dblue

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Question 2109

jamb 1988

In the figure above, what is the angle of reflection of the ray of light at mirror M\(_2\)?

A\( 90^{\circ} \)

B\( 60^{\circ} \)

C\( 45^{\circ} \)

D\( 30^{\circ} \)

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Question 2110

jamb 1988

The fig above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y

A12Hz

B19Hz

C60Hz

D75Hz

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Question 2111

jamb 1988

When one arm of a U-tube manometer is connected to a gas supply, the levels of mercury in the two arms of the U-tube is shown in the figure above, if the atmospheric pressure is 76.0cm hg, the gas pressure is

A62.6cm hg

B72.5cm hg

C79.5cm hg

D85.9cm hg

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Question 2112

jamb 1988

the fig above shows three different ways of hanging a heavy picture from a hook. the tension in the string will be?

AGreatest in X

BGreatest in Y

CGreatest in Z

DSame in each one

View Explanation & Discuss

Question 2113

jamb 1988

the fig above shows displacement-time graphs for three different motions. which of the following statements is correct?

Agraph 2 corresponds to the highest velocity

Bgraph 1 corresponds to zero velocity

Cgraph 3 corresponds to a particle moving in the negative x direction

Dgraph 2 corresponds to a particle moving in the positive x direction

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Question 2114

jamb 1988

Which of the following symbolic representations is correct for an atom X with 22 electrons and 43 neutrons?

A\(^{43}_{22}X\)

B\(^{22}_{43}X\)

C\(^{65}_{43}X\)

D\(^{65}_{22}X\)

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Question 2115

jamb 1988

In a certain fusion reaction, a deuteron (\(^{2}_{1}H\)) interacts with a triton (\(^{3}_{1}He\)) and produces an a-particle (\(^{4}_{2}He\)) and a second product. The second product is

Aa proton

Ban electron

Ca neutron

Da gamma ray

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Question 2116

jamb 1988

A dynamo primarily combines

Amechanical energy into electrical energy

Belectrical energy into kinetic energy

Cpotential energy into kinetic energy

Dkinetic energy into potential energy

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Question 2117

jamb 1988

The principle of operation of an induction coil is based on

AOhm's law

BAmphere's law

CFaraday's law

DColumbs law

View Explanation & Discuss

Question 2118

jamb 1988

Which of the following ammeters may be used to measure alternating currents? i. moving-coil ammeter ii. moving-iron ammeter iii. hot-wire ammeter

Ai and ii only

Bii and iii only

Ci and iii only

Di, ii, and iii

View Explanation & Discuss

Question 2119

jamb 1988

A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?

AN4.80

BN48.00

CN480.00

DN4800.00

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Question 2120

jamb 1988

When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is

A\(\frac{2}{1}\)R

B\(\frac{1}{2}\)R

C\(\frac{3}{2}\)R

D5R

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