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Past Questions

45 questions

Question 1 of 20 45 total questions

Question 1

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 2

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

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Question 3

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

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Question 4

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 5

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 6

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 7

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 8

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

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Question 9

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 10

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 11

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 12

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 13

jamb 1988

The principle of operation of an induction coil is based on

AOhm's law

BAmphere's law

CFaraday's law

DColumbs law

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Question 14

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

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Question 15

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 16

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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Question 17

jamb 1988

A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is

A12.0%

B25.0%

C33.3%

D75.0%

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Question 18

jamb 1988

A spectrum of sunlight is said to be impure when

Ait is made of only three colours

Bit has no red colour in it

Cthe different colours in it overlap

Dit does not contain white light

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Question 19

jamb 1988

Which of the following statement is TRUE of ultraviolet, visible and infra-red rays?

Athey are all electromagnetic waves with the same wavelength

Bultra-violet rays have shorter wavelengths than infra-red rays and produce flourescence

Cinfrared rays have shorter wavelength than visible light and produce the sensation of heat

Dthe wavelenghts increase in the sequence: visible, ultra-violet, infra-red

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Question 20

jamb 1988

When white light is dispersed by a spectrometer, the component having the shortest wavelength is

Aorange

Bgreen

Cviolet

Dred

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