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Past Questions

141 questions

Question 1 of 20 141 total questions

Question 1

neco 2001

In 24 days a radioactive isotope decreases in mass from 128g to 2g. What is the half-life of the radioactive material?

A2.54 days

B4.00 days

C4.80 days

D6.00 days

E8.00 days

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Question 2

neco 2001

The magnetic effect of a current-carrying coil is NOT utilized in the making of a/an

Acarbon microphone

Belectric bells

Cmagnetic relay

Dtelephone earpiece

Ethermostat

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Question 3

neco 2001

A wave is represented by the equation y = 0.5 sin 0.4π(X - 60t), where the distance (X) is measured in centimetres and time (t) in seconds. What is the wavelength of the wave?

A0.2cm

B0.4cm

C0.8cm

D5.0cm

E10.0cm

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Question 4

neco 2001

What is the angular velocity of an object in a horizontal circular path of radius 1.5m with a constant speed of 12ms^-1?

A1.6 rads^-1

B4.0 rads^-1

C8.0 rads^-1

D16.0rads^-1

E32.0 rads^-1

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Question 5

neco 2001

The inside of a vacuum flask is usually coated with silver to reduce heat loss by

Acondensation

Bconduction

Cconvection

Devaporation

Eradiation

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Question 6

neco 2001

Which statement is NOT correct about molecules?

AThe number of molecules in a unit volume of a solid is greater than that in a unit volume of a liquid or gas.

BMolecules are made up of atoms

CThe force of attraction between two molecules of a solid is greater than that between two molecules of a liquid or gas

DMolecules of gases are in regular motion

EMolecules of a solid vibrate about their mean positions.

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Question 7

neco 2001

An astronaut is walking on the moon where the magnitude of the acceleration due to gravity "g’ is one-sixth that on earth. Compared with their magnitudes on the earth, his mass and weight on the moon are

Aboth less

Bless and the same respectively

Cthe same and less respectively

Dthe same as on earth

Eboth greater.

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Question 8

neco 2001

What part of a camera functions in a similar way to the retina of the eye?

Adiaphragm

Bfilm

Cfocusing ring

Dlens

Eshutter

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Question 9

neco 2001

Which is NOT one of the laws of solid friction?

AThe frictional force between two surfaces opposes their relative motion

BThe ratio of frictional force to the normal reaction varies for two given surfaces

CThe ratio of frictional force to the normal reaction is constant for two given surfaces

DThe limiting frictional force is independent of the area of surface in contact.

EDynamic frictional force is independent of the relative velocity of the surfaces in contact.

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Question 10

neco 2001

An electron of charge a = 1.6 × 10^-19C is situated in a uniform electric field of intensity 2.4 × 105 V m^-1. What is the force on the electron?

A1.60 × 10^-19N

B3.84 × 10¹⁹N

C1.92 × 10^-14N

D3.84 × 10^-14N

E7.68 × 10^-14N

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Question 11

neco 2001

Which statement is TRUE of a block of stone of mass m, with zero momentum?

AThe acceleration of the stone is non-uniform

BThe stone is stationary

CThe stone moves at a constant velocity

DThe stone moves with maximum velocity

EThe stone moves with minimum velocity.

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Question 12

neco 2001

A transformer is connected to a 250 V a.c. supply. The primary coil has 5000 turns and the secondary voltage is found to be 10 V. What is the number of turns in the secondary coil?

A100

B150

C200

D250

E300

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Question 13

neco 2001

The falling of light energy on a metal such that electrons are liberated from the metal is called

Aelectron effect

Bmetal electron effect

Cmetal emission

Dphotoelectric effect

Ephotoemission

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Question 14

neco 2001

An object 3.00m high is placed at a distance of 7.50m from a pin-hole camera. If the image height is 6.00 cm, what is the distance of the film from the pin-hole?

A3.75cm

B7.50cm

C15.00cm

D30.00cm

E150.00 cm

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Question 15

neco 2001

The main function of the commutator in a simple d.c. motor is to

Aenable the armature to rotate freely

Bincrease the flux linking the armature windings

Cmaintain a direct current in the armature

Dprovide uniform magnetic field around the armature

Ereverse the direction of the current in the armature.

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Question 16

neco 2001

When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eye piece is 5.0cm. What is the distance between the lenses?

A10.0cm

B30.0cm

C45.0cm

D55.0cm

E250.0cm

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Question 17

neco 2001

Given the same amount of beat, a quantity of water will reach a higher temperature in a brass pot than in a clay pot of the same mass because

Abrass is less dense than clay

Bclay expands more slowly than brass

Cclay loses heat faster than brass

Dthe specific heat capacity of brass is higher than that of clay

Ethe specific heat capacity of brass is lower than of clay.

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Question 18

neco 2001

An object is placed 15cm in front of a concave mirror of focal length 20cm. The image formed is

Areal, inverted and diminished

Breal, inverted and magnified

Cvirtual, erect and diminished

Dvirtual, erect and magnified

Evirtual, inverted and magnified

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Question 19

neco 2001

If N.E.P.A. charges 65 kobo per kilowatt-hour for electricity supplied to consumers, what bill would an electric iron rated at 750 watts attract when used for 24 hours?

AN9.70

BN11.70

CN12.40

DN15.90

EN17.60

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Question 20

neco 2001

When water is heated between 0°C and 4°C, it's density

Aincreases for a while and then decreases

Bdecreases for a while and then increases

Cincreases

Ddecreases

Eremains constant.

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