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45 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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45 questions

Question 1 of 20 45 total questions

Question 11

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 12

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

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Question 13

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

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Question 14

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 15

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

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Question 16

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 17

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

Question 18

jamb 1988

A note is called an octave of another note when

Aits frequency is twice that of the first note

Bits frequency is half of the first note

Cthe notes have the same fundamental frequency

Dits periodic time is twice that of the first note

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Question 19

jamb 1988

A piano wire 0.5m long has a total mass of 0.01kg and is stretched with a tension of 800N. Calculate the frequency of the wire when it sounds its fundamental note

A200Hz

B100Hz

C4Hz

D2Hz

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Question 20

jamb 1988

Which of the following properties is/are common to all waves? i. Diffraction ii. Refraction iii. Interference

Ai only

Bii only

Cii and iii

Di, ii, and iii

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Question 21

jamb 1988

Which of the following media allow the transmission of sound wave through them i. Air. ii. Liquids. iii. Solids.

Ai and ii only

Bi and iii only

Cii and iii only

Di,ii and iii

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Question 22

jamb 1988

When heat is applied to one end of a metal rod, the molecules at the other end soon begin to vibrate with greater amplitude than before because heat has been transferred by

Aradiation

Bconvection

Cconduction

Devaporation

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Question 23

jamb 1988

A tap supplies water at 25^oC while another supplies water at 75^oC. If a man wishes to bathe with water at 40^oC, the ratio of the mass of cold water to the mass of hot water required is

A1 : 3

B15 : 8

C7 : 3

D3 : 1

View Explanation & Discuss

Question 24

jamb 1988

The amount of heat needed to raise the temperature of 10kg of copper by 1k is its

Aspecific heat capacity

Bheat capacity

Clatent heat

Dinternal energy

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Question 25

jamb 1988

The product PV where P is pressure and V is volume has the same unit as

Aforce

Bpower

Cenergy

Daccelaration

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Question 26

jamb 1988

A body whose mass is 2kg and has a volume of 500cm3 just floats when completely immersed in a liquid. Calculate the density of the liquid

A4.0 x 10²kgm^-3

B4.0 x 10³kgm^-3

C1.0 x 10³kgm^-3

D1.0 x 10⁶kgm^-3

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Question 27

jamb 1988

A force, 10N, drags a mass 10kg on a horizontal table with an acceleration of 0.2ms. If the acceleration due to gravity is 10ms-1, the coefficient of friction between the moving mass and the table is

A0.02

B0.08

C0.20

D0.80

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Question 28

jamb 1988

How long will it take a 60kg man to climb a height of 22m if he expended energy at a rate of 0.25kW. [g = ms^-2]

A5.3s

B34.5s

C41.6s

D52.8s

View Explanation & Discuss

Question 29

jamb 1988

A 20-toothed gear wheel drives a 60-toothed one. If the angular speed of the smaller wheel is 120 rev s^-1, the angular speed of the larger wheel is

A3 rev s^-1

B40 rev s^-1

C360 rev s^-1

D2400 rev s^-1

View Explanation & Discuss

Question 30

jamb 1988

A particle starts from rest and moves with a constant acceleration of 0.5ms\(^{-2}\). The distance covered by the particle in 10s is?

A2.5m

B5.0m

C25.0m

D50.0m

View Explanation & Discuss

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