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45 questions

Question 1 of 20 45 total questions

Question 11

neco 2003

A transformer is required to give 120V from a 240V mains supply. If the primary has 5500 turns, how many turns has the secondary?

A232

B450

C550

D2750

E11000

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Question 12

neco 2003

A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the

Acharges generated by friction in the tanker are conducted to the earth

Bchain vibrates in resonance with the tanker’s engine

Cheat generated by friction in the engine is conducted to the earth

Dpetrol tanker is balanced on the road

Etanker does not exceed a certain speed limit

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Question 13

neco 2003

Calculate the critical angle for light traveling from water to air. (Refractive index of water = 1.33)

A36.9°

B41.3°

C48.8°

D49.2°

E51.4°

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Question 14

neco 2003

A platinum-resistance thermometer has a resistance of 4Ω at 0°C and 12Ω at 100°C. Assuming that the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45°C.

A6.0Ω

B6.42Ω

C7.6Ω

D8.4Ω

E16.0Ω

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Question 15

neco 2003

The inability of the eye to focus near objects is known as

Aastigmatism

Beye ring

Chypermatropia

Dmyopia

Epresbyopia

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Question 16

neco 2003

Which of the following motions will be produced by a pair of equal, opposite and non-collinear parallel forces acting on a body?

AOscillatory

BRandom

CRotational

DTranslational

EVibratory

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Question 17

neco 2003

A narrow, uniform glass tube, closed at one end, constains air which is sealed by a thread of mercury. The tube is placed first horizontally and then vertically with the open end at the top. Which of the following statements is correct?

AThe length of the entrapped air in the horizontal position is less than that in the vertical position

BThe length of the entrapped air in the vertical position is less than that in the horizontal position

CThe length of the mercury column becomes shorter in the horizontal position than in the vertical position

DThe length of the mercury column becomes shorter in the vertical position than in the horizontal position

EThe pressure of the entrapped air is atmospheric in both cases.

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Question 18

neco 2003

The S.l unit of magnetic flux density is

Afarad

Bhenry

Ckgm^-3

Dtesla

Eweber

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Question 19

neco 2003

A stone is released from a height of 80m above the ground. Calculate its velocity just before it strikes the ground. (g = 10ms\(^{-2}\))

A25ms^-1

B40 ms^-1

C55 ms^-1

D65ms^-1

E80 ms^-1

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Question 20

neco 2003

A constant force of 5N acts for 5s on a mass of 5kg initially at rest. Calculate the final momentum of the mass.

A125 kgms^-1

B75 kgms^-1

C25 kgms^-1

D20 kgms^-1

E5 kgms^-1

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Question 21

neco 2003

The motion of the prongs of a sounding turning fork is

Acircular

Boscillatory

Crandom

Drotational

Etranslational

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Question 22

neco 2003

The resistance of a series R-C circuit is 5 ω If the impedance of the circuit is 13 ω calculate the reactance of the capacitor

A12 Ω

B14 Ω

C16 Ω

D18 Ω

E65 Ω

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Question 23

neco 2003

Two equal capacitances are connected first in series and then in parallel. The ratio of the effective series capacitance to the effective parallel capacitance is

A0.25

B0.50

C1.00

D2.20

E4.00

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Question 24

neco 2003

A body that produces its own light is said to be

Aluminous

Bnon-incandescent

Copaque

Dtranslucent

Etransparent

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Question 25

neco 2003

\(^{226}_{88}Ra\) \(\to\) \(^{222}_{86}Rn\) + X + Energy. The equation above represents a nuclear decay of radium isotope. What is X?

AAlpha particle

BBeta particle

CGamma ray

DNeutron

EX – ray

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Question 26

neco 2003

A wire of length 100cm and cross-sectional area 2.0 × 10-3cm2 has a resistance of 0.10 ω. Calculate its electrical conductivity.

A2.0 × 10-6 ω^-1cm^-1

B5.0 × 105 ω^-1cm^-1

C2.0 × 106 ω^-1cm^-1

D5.0 × 10-6 ω^-1cm^-1

E5.0 × 107 ω^-1cm^-1

View Explanation & Discuss

Question 27

neco 2003

Lines of force

I. Begin and end on equal and opposite electric charges.
II. are in state of tension which causes them to shorten
III. attract one another.

Which of the statement(s) is/are correct?

AI only

BII only

CIII only

DI and II only

EII and III only

View Explanation & Discuss

Question 28

neco 2003

Which of the following radiations have the longest wavelength?

AGamma rays

BInfra-red

CLight waves

DRadio waves

EUltra-violet rays

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Question 29

neco 2003

How much heat is required to convert 50g of water at 100°C to steam at the same temperature? (Specific latent heat of vaporization of water = 2260 Jg^-11)

A1.13 × 10^-4J

B1.31 × 10²J

C1.30 × 10⁴J

D1.13 × 10⁵J

E1.31 × 10⁶J

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Question 30

neco 2003

For which of the following sets are the units fundamental?

AArea, length and volume

BImpulse, mass and time

CLength, time and mass

DVelocity, distance and time

EVolume, mass and density

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