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98 questions

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Question 31

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 32

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

View Explanation & Discuss

Question 33

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

View Explanation & Discuss

Question 34

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

View Explanation & Discuss

Question 35

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 36

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 37

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 38

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

View Explanation & Discuss

Question 39

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 40

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 41

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 42

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

View Explanation & Discuss

Question 43

jamb 1988

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

Aorange

Bgreen

Cviolet

Dred

View Explanation & Discuss

Question 44

jamb 1988

Which of the following phenomena explains the formation of a mirage? i. Reflection ii. Refraction iii. Diffraction

Ai and ii only

Bii and iii only

Ci and iii only

Di, ii, and iii only

View Explanation & Discuss

Question 45

jamb 1988

An object is placed 10cm in front of a concave mirror of focal length 15cm. What is the position and nature of the image formed?

A30cm and virtual

B6cm and real

C6cm and virtual

D30cm and real

View Explanation & Discuss

Question 46

jamb 1988

To obtain a magnification of 2.5, how far should an object be placed from the pole of a thin converging lens of focal length 0.20m?

A0.13m

B0.25m

C0.28m

D0.50m

View Explanation & Discuss

Question 47

jamb 1988

Two strings of the same length and under the same tension gives notes of frequencies in the ratio 4 : 1. The masses of the strings are in the corresponding ratio of

A2 : 1

B1 : 2

C1 : 4

D1 : 16

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Question 48

jamb 1988

A slight loading of a tuning fork has the effect of

Adecreasing its amplitude

Bincreasing its amplitude

Cdecreasing its frequency

Dincreasing its frequency

View Explanation & Discuss

Question 49

jamb 1988

The speed of sound in air at sea level is 340ms\(^{-1}\) while that of light is 300 000kms\(^{-1}\). How far (to the nearest meter) from the center of a thunderstorm is an observer who hears a thunder 2s after a lightning flash?

A170m

B340m

C600m

D680m

View Explanation & Discuss

Question 50

jamb 1988

Which of the following factors affects the speed of sound in air? i. Temperature ii. pressure iii. Frequency

Ai only

Bii only

Ci and ii only

Dii and iii only

View Explanation & Discuss

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