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1,904 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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1,904 questions

Question 1 of 20 1,904 total questions

Question 931

waec 1988

Which of the following particles of ray has the highest penetrating power?

ABeta particles

BAlpha particles

CGamma particles

DElectrons

ENeutrons

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Question 932

waec 1988

Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004m2 if the resistance is 3.0 Ω.

A0.0000267Ωcm

B0.006Ωcm

C0.26700Ωcm

D0.27500Ωcm

E0.060000Ωcm

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Question 933

waec 1988

Which of the following statement is not correct about loaded spiral spring?

AThe extension is proportional to the load applied, provided the elastic limite is not exceeded

BIf the elsatic limit is not exceeded, the contraction is proportional to the load removed.

CUp to the yield limit, extension is no longer proportional to the applied load.

DBeyond the elsatic limit, extension is no longer proportional to the applied load.

EIf the string regains its shape or form after deformation, it is said to be elastic.

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Question 934

waec 1988

What is the effect of using split-rings in a simple d.c motor?

AThe direction of rotation of the coil is reversed

BThe current in the coil flows in the same direction

CThe current in the coil becomes alternating

DThe direction of the force on the coil is reversed

EThe contact with the voltage is cut-off

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Question 935

waec 1988

A lamp is marked 220V 60 W. Calculate the energy it would consume when connected to a 220V source for 1 hour.

A216000J

B13200J

C3600J

D864J

E220J

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Question 936

waec 1988

It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil same quantity of water using the same heating coil but with the current doubled? (neglecting any external heat loss).

A64 minutes

B32 minutes

C8 minutes

D2 minutes

E1 minute

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Question 937

waec 1988

Two parallel conductors carry equal currents in the same direction. Which of the following statement is not a correct observation?

AEach of teh conductors will experience a force

BEach of the conductors can move

CThe forces on the conductors will be equal

DThere are concentric lines of force around each conductor

EThe two conductors will repel each other

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Question 938

waec 1988

A battery of emf 24V and internal resistance 4Ω is connected to a resistor of 32Ω. What is the terminal p.d of the battery?

A24.0V

B21.3V

C16.0V

D2.7V

E2.0V

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Question 939

waec 1988

A cell can supply current of 0.8A and 0.4A through a 2Ω and a 3Ω resistors respectively. Calculate the internal resistance of the cell.

A0.2Ω

B0.4Ω

C1.0Ω

D3.0Ω

E9.0Ω

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Question 940

waec 1988

Local action is normally prevented from taking place in a simple electric cell by

Aintroducing an oxidising agent into the acid

Bnot drawing current continuously for long periods

Camalgamating the surface of the zinc plate

Dusing a porous pot to isolate the zinc plate from the acid

Eusing dilute sulphuric acid

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Question 941

waec 1988

A transformer with 5500 turns in its primary is used between a 240V a. c supply and a 120V kettle. Calculate the number of turns in the secondary

A11000

B2750

C460

D232

E10

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Question 942

waec 1988

If the leaves a positively charged electroscope collapse completely as an object is brought near the cap of the electroscope, the objects possesses

Aan equal amount of positive charge

Bless amount of negative charge

Cno charge

Da positive charge

Ean equal amount of negative charge

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Question 943

waec 1988

A sounding tuning fork is brought near the end of a pipe containing an air column and the loudness of the sound increases. This effect is due to

Adiffraction

Ban echo

Cresonance

Dinterference

Ereverberation

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Question 944

waec 1988

A boy standing a distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms1, how far is he from the cliff?

A17m

B34m

C85m

D170m

E680m

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Question 945

waec 1988

Which of the following statement s is/are not correct about a standing wave? I. It is formed by the superimposition of two progressive waves traveling in the same direction II. All points on the wave are vibrating with maximum displacement III. It is formed by the superimposition of two progressive waves of different amplitudes traveling in opposite directions

AI only

BII only

CI and II only

DII and III only

EI,II and III

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Question 946

waec 1988

A source of sounds produces waves in air of wavelength1.65m. If the speed of sound in air is 330ms-1 the period of vibration in seconds is

A200

B2.0

C0.5

D0.02

E0.005

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Question 947

waec 1988

The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called?

Arefraction

Breflection

Cdiffraction

Dinterference

Edispersion

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Question 948

waec 1988

The ability of the eye to focus objects at different distances is called

Apower

Baccommodation

Cnormal vision

Dpersistence of vision

Elong sight

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Question 949

waec 1988

An object is placed 36cm from a converging lens of focal length 24cm.If a real image which is 4cm high is formed, Calculate the height of the object.

A2.0cm

B4.0cm

C6.0cm

D8.0cm

E10.0cm

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Question 950

waec 1988

The velocities of light in air and glass are 3.0 x10\(^8\)ms\(^{-1}\) and 1.8 \(\times \)10\(^8\) ms\(^{-1}\) respectively. Calculate the sine of the angle of incidence that will produce an angle of refraction of 30° for a ray of light incident on glass.

A1.2

B1.0

C0.8

D0.6

E0.3

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