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141 questions

Question 1 of 20 141 total questions

Question 11

neco 2001

The lower and upper fixed points of a mercury-in-glass thermometer are marked X and 180 mm respectively. On a particular day the mercury meniscus in the thermometer rises to 60mm. If the corresponding reading on a Celsius scale is 20 ° C, what is the value X?

A6.0mm

B18.0mm

C30.0mm

D60.0mm

E120.0mm

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Question 12

neco 2001

The speed of sound travelling in various media increases in the order:

Aair, iron bar, water

Bair, water, iron bar

Ciron, bar water, air

Dwater, air, iron bar

Ewater, iron bar, air

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Question 13

neco 2001

A 220 V, 60 Hz alternating current supply is connected to an inductor of 3.5H. What is the current passing through the inductor?

A0.0167 A

B0.1670 A

C1.6700 A

D16.7000 A

E167.0000 A

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Question 14

neco 2001

Which statements(s) is/are NOT true?

I. A saturated vapour is one that is in equilibrium with its liquid in a closed space. II. A vapour contains molecules with varying kinetic energy and their distances apart are smaller than those of the molecules of a liquid
III. Relative Humidity = \(\frac{\text{Saturated vapour pressure at dew point}} {\text{Saturated vapour pressure at air temperature}}\) x 100%

IV. The saturated vapour pressure of water increases with temperature

AI only

BII only

CII and III only

DIII and IV only

EII, III and IV only

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Question 15

neco 2001

Which statement is a correct consequence of the uncertainly principle?

AA particle’s kinetic energy cannot be measured accurately at any time

BBoth momemtum and energy of a particle can be known with absolute certainly

CIt is possible to measure exactly both the position and momentum of a particle at the same time

DThe complete knowledge of the position of a particle implies the complete ignorance of its energy

EThe uncertainty in our knowledge of energy and the duration taken to measure it, are each less than Planck’s constant.

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Question 16

neco 2001

A cell can supply currents of 0.60 A and 0.30 A through a 2.0 ω and a 5.0 ω resistor respectively. What is the internal resistance of the cell?

A0.2 ω

B0.4 ω

C1.0 ω

D3.0 ω

E9.0 ω

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Question 17

neco 2001

Which material is best for making a permanent magnet?

Aaluminium

Bcobalt

Ccopper

Dsoft iron

Esteel

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Question 18

neco 2001

A body whose initial velocity is u is uniformly accelerated to a final velocity v in t seconds. If the distance travelled is s, and the acceleration is a, which equation is INCORRECT for the motion of the body?

As = ut+\(\frac{1}{2}\)at²

Bv² = u² + 2as

Cv =u + at

Dv = u + 2as

Es = \(\frac{1}{2}\)(u+v)t

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Question 19

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 20

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 21

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 22

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 23

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 24

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 25

neco 2001

Which is a stringed Instrument?

Adrum

Bflute

Cpiano

Dsaxophone

Etrumpet

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Question 26

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 27

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 28

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 29

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 30

neco 2001

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

Aelectron

Bhydrogen

Clithium

Dneutron

Eproton

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