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322 questions

Question 1 of 20 322 total questions

Question 131

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

View Explanation & Discuss

Question 132

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

View Explanation & Discuss

Question 133

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

View Explanation & Discuss

Question 134

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

View Explanation & Discuss

Question 135

neco 2001

Which is a stringed Instrument?

Adrum

Bflute

Cpiano

Dsaxophone

Etrumpet

View Explanation & Discuss

Question 136

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

View Explanation & Discuss

Question 137

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

View Explanation & Discuss

Question 138

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

View Explanation & Discuss

Question 139

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

View Explanation & Discuss

Question 140

neco 2001

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

Aelectron

Bhydrogen

Clithium

Dneutron

Eproton

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Question 141

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

View Explanation & Discuss

Question 142

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

View Explanation & Discuss

Question 143

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

View Explanation & Discuss

Question 144

neco 2001

Which scientist discovered natural radioactivity?

AEnrico Fermi

BHenri Becquerel

CMarie Curie

DMicheal Faraday

ENiels Bohr

View Explanation & Discuss

Question 145

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

View Explanation & Discuss

Question 146

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

View Explanation & Discuss

Question 147

neco 2000

A boy ran a distance of 200m in 24s. His average speed was 8.3ms^-1. Which of the following is correct about the units in which the statements above are expressed?

AAll the units are fundamental.

BAll the units are derived

CAll the units except one are S.I units

DTwo of the units are fundamental and one derived.

ENone of the units is S.I units.

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Question 148

neco 2000

An electric bell operated within an evacuated bell jar enables us to infer correctly that

Alight waves require a medium for transmission

Bsound waves do not require a medium for transmission

Clight waves do not require a medium for transmission but sound waves do

Dlight waves travel much faster than sound waves

Elight waves and sound waves travel at the same speed

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Question 149

neco 2000

I. A scalar quantity has only magnitude
II. A scalar quantity has both magnitude and direction
III. A vector quantity has both magnitude and direction
IV. A vector quantity has only magnitude.

Which of the above statement is/are correct?

AI only

Bl and II only

Cl and III only

DII and III only

EII and III only

View Explanation & Discuss

Question 150

neco 2000

A block of a substance X will sink in a liquid V but float liquid Z. Which of the following statements is NOT correct about the densities of the three substances?

ADensity of liquid Z is greater than that of X

BDensity of liquid V is less than that of liquid X

CDensity of liquid Y is less than that of liquid Z

DLiquid Z has the greatest density of all the three substances.

EIf liquids V and Z do not mix, liquid Z will float on liquid V.

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