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4,719 questions

Question 1 of 20 4,719 total questions

Question 1421

neco 2001

A metal has a work function of 3.0 eV. What is the threshold frequency of the metal when electrons are just liberated from the metal.(1 eV = 1.6 × 10-19J; h = 6.6 × 10-34Js)

A4.8 × 10^-19Hz

B9.3 × 10^-7Hz

C4.8 × 10¹⁴Hz

D7.3 × 10¹⁴Hz

E9.3 × 10¹⁴Hz

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Question 1422

neco 2001

A lead-acid accumulator is used in preference to a dry battery in a car because

Aa dry battery cannot supply the necessary high voltage

Ba dry battery would not operate on a cold frosty morning

Cthe accumulator can give a bigger current and can be recharged

Dthe accumulator can supply a.c

Ethe chemicals used in a dry battery constitute a fire hazard.

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Question 1423

neco 2001

What gives rise to the line spectra observed in atoms?

Achange of an electron from a higher to a lower energy level in the atom

Bdisturbed protons in the nucleus

Cexcitation of an electron in the atom

Dkinetic energy of a moving atom

Epotential energy of an electron inside an atom

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Question 1424

neco 2001

How much heat is required to convert 5.0g of ice at 0 ° C to water at the boiling point? (Specific latent heat of ice = 336Jg-1 specific heat capacity of water = 4.2Jg-1K-1)

A420 J

B1680 J

C1701 J

D2100 J

E3780 J

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Question 1425

neco 2001

The wavelength of a stationary wave is 24.0cm. What is the distance between a node and the next antinodes?

A6.0cm

B12.0cm

C18.0cm

D24.0cm

E48.0cm

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Question 1426

neco 2001

The statement that the mechanical advantage of a machine is 3 means that the

Aefficiency is 33\(\frac{1}{3}\)%

Beffort is three times as large as the load

Cmechanical advantage is 3 times as large as the velocity ratio

Dratio of the effort to the load is 1: 3

EVelocity ratio is 3

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Question 1427

neco 2001

Which is a stringed Instrument?

Adrum

Bflute

Cpiano

Dsaxophone

Etrumpet

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Question 1428

neco 2001

Which statement about the concept of temperature is NOT true?

ATemperature decides the direction of heat flow between two bodies

BTemperature is a measure of coldness of a body

CTemperature is a vector quantity

DTemperature is a measure of hotness of a body.

ETemperature scales include Fahrenheit, Celsius and Kelvin

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Question 1429

neco 2001

An object placed 15cm from a converging lens forms a real image whose magnification is 2.0. What is the focal length of the lens?

A5.00cm

B10.00cm

C15.00 cm

D18.00 cm

E20.00cm

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Question 1430

neco 2001

N.N.P.C. gas cylinder containing 15kg of cooking gas was left open, and the gas emptied in 3.8 minutes, at an average speed of 20 ms^-1. What force was exerted on the gas in the cylinder?

A132N

B13.2N

C1.32N

D0.132N

E0.013N

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Question 1431

neco 2001

A waterfall is 630m high. What is the change in temperature of a quantity of water that falls from the top to the bottom of the waterfall? (Neglect heat losses to the surroundings, take g as 10 ms-2 and specific heat capacity of weather as 4200J kg-1K-1

A0.015°C

B1.50°C

C15.00°C

D21.00 °C

E50.00°C

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Question 1432

neco 2001

What is X in the equation given below? 42He + 94Be → 126C + X

Aelectron

Bhydrogen

Clithium

Dneutron

Eproton

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Question 1433

neco 2001

Notes of the same frequency sounded on a piano and on a flute may differ in

I. pitch
II. quality
III. Loudness

AI only

BII only

CI and III only

DII and III only

EI, II and III

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Question 1434

neco 2001

What is the energy stored in a 10μ F capacitor if the potential difference between the plates is 40 V?

A2.0 × 10^-4J

B8.0 ×10^-4J

C4.0 × 10^-3J

D8.0 × 10^-3J

E1.6 × 10^-2J

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Question 1435

neco 2001

Totally reflecting prisms are preferred to mirrors in periscopes because

I. mirror gives multiple images
II. silvering on mirrors is easily damaged
III. mirrors reflect less light than totally reflecting prisms

AI only

BI and II only

CI and III only

DII and III only

EI,II and III

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Question 1436

neco 2001

Which scientist discovered natural radioactivity?

AEnrico Fermi

BHenri Becquerel

CMarie Curie

DMicheal Faraday

ENiels Bohr

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Question 1437

neco 2001

50cm\(^3\) of air at a pressure of 5Nm\(^{-2}\) is enclosed in a metal tube by a piston. If the piston is pushed in a distance of 10cm, what will the pressure of the air become, if the cross-sectional area of the tube is 2cm\(^{-2}\)? (Assume that the temperature remains constant throughout)

A12.5 Nm^-2

B8.7 Nm^-2

C8.3 Nm^-2

D3.8Nm^-2

E3.0Nm^-2

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Question 1438

neco 2001

The invisible part of the spectrum of white light consists of

AInfra-red and ultra-violet only

BInfra-red, ultra-violet and blue only

Cred, orange and green only

Dred and violet only

Eyellow and indigo only

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Question 1439

waec 2001

Electrons passing through crystals are diffracted because they

Aare repelled by the atoms in the crystal

Bare attracted by the atoms in the crystals

Cpossess wave properties

Dare particles

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Question 1440

waec 2001

A nitrogen nucleus bombarded with an alpha particle produces an oxygen nucleus and a proton. The nuclear reaction for this process is \(^4_2H + ^{14}_2N \to ^{17}_{8}O + ^1_1H + Q\). Which of the following statements about the reaction is not correct?

Athe bombardment results into a nucleus with greater proton number

Bit is an induced nuclear reaction

Cit is a natural radioactive decay

Dthe sum of the final nucleon numbers

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