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322 questions

Question 1 of 20 322 total questions

Question 111

neco 2002

What is the escape velocity of a satellite launched from the earth’s surface? (Take g as 10ms\(^{-2}\) and the radius of the earth as 6.4 × 10\(^6\)m)

A7.80 × 10kms^-1

B11.2 × 10kms^-1

C3.56 × 107ms^-1

D6.00 × 107ms^-1

E1.20 × 108ms^-1

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Question 112

neco 2002

In the normal use of a simple microscope, a person sees an

Aerect, real and magnified image

Berect, virtual and magnified image

Cinverted, virtual and magnified image

Dinverted, real and magnified image

Einverted and real image the same size as the object

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Question 113

neco 2002

Which device does NOT make use of the magnetic effects of an electric current?

Ahot-wire ammeter

Bmoving-coil ammeter

Cmoving-coil loudspeaker

Dmoving-iron ammeter

Etelephone earpiece

View Explanation & Discuss

Question 114

neco 2002

The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?

A4V

B8V

C16V

D200V

E4000V

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Question 115

neco 2002

Which is a fundamental unit?

Aampere

Bjoule

CNewton

Dohm

Ewatt

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Question 116

neco 2002

An object 8cm in front of a plane mirror moves at a speed of 6cm s^-1 away from the mirror. What will be the distance separating the object and the image after 2s?

A8cm

B12cm

C20cm

D28cm

E40cm

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Question 117

neco 2002

An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?

A10k

B50k

CN1.00

DN5.00

EN10.00

View Explanation & Discuss

Question 118

neco 2002

Which colour is deviated least when white light passes through a triangular prism?

Agreen

Bindigo

Cred

Dviolet

Eyellow

View Explanation & Discuss

Question 119

neco 2002

The ability of the eye to focus on objects at various distances is known as

Aaccommodation

Bastigmatism

Ceye ring

Dmyopia

Epresbyopia

View Explanation & Discuss

Question 120

neco 2002

In an operating X-ray tube, a high p.d is applied between the cathode and the anode for the purpose of

Aaccelerating the electrons to a very high energy

Bconcentrating electrons on the target

Cheating the anode

Dheating the cathode

Eproducing a stream of electrons

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Question 121

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 122

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

View Explanation & Discuss

Question 123

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 124

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

View Explanation & Discuss

Question 125

neco 2001

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

Acondensation

Bconduction

Cconvection

Devaporation

Eradiation

View Explanation & Discuss

Question 126

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 127

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.

View Explanation & Discuss

Question 128

neco 2001

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

Adiaphragm

Bfilm

Cfocusing ring

Dlens

Eshutter

View Explanation & Discuss

Question 129

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 130

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

View Explanation & Discuss

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