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322 questions

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Question 101

neco 2002

Lenz’s law of electromagnetic induction states that

Ae.m.f. is induced in a circuit whenever there is a change in the magnetic flux linked with the circuit

Bthe induced e.m.f. in a circuit is proportional to the rate of change f the number of lines of force linking the circuit

Cthe induced current in a conductor is in such a direction as to oppose the change producing it

Da force is exerted in a current-carrying conductor in a magnetic field.

Ethe induced e.m.f. is proportional to the current producing the magnetic flux.

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Question 102

neco 2002

What is stored by a dry Leclanhé cell?

Achemical energy

Bheat energy

Cmechanical energy

Dnuclear energy

Esolar energy

View Explanation & Discuss

Question 103

neco 2002

An object is projected with a velocity of 50ms-1 from ground level at an angle θ to the vertical. If the total time of flight of the projectile is 5s, what is the value of θ? (g = 10ms-2)

A0°

B30°

C45°

D60°

E90°

View Explanation & Discuss

Question 104

neco 2002

Which radiation is emitted when a beam of fast moving cathode rays is stopped by a heavy element?

AAlpha rays

BGamma rays

CPositive rays

DUltraviolet rays

EX-rays

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Question 105

neco 2002

The use of electrical fuses in domestic wiring is

Ato prevent and electrical shock

Bto supply electricity to all the electrical appliances

Cto allow electricity to flow easily through the mains to all the circuits

Dto cut off the mains supply it too high a current flows

Eto fuse all the circuit into one

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Question 106

neco 2002

What does NOT affect the rate of evaporation of a liquid

Aexposed surface area of the liquid

Bhumidity of the surroundings

Cnature of the liquid

Dtemperature the liquid

Evolume of the liquid.

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Question 107

neco 2002

If the refractive index of water is 1.33, what is the critical angle for a water-air boundary?

A36.0 °

B40.2 °

C41.8 °

D48.8 °

E62.7 °

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Question 108

neco 2002

A negatively charged rod is brought near the cap of an electroscope. The cap is earthed momentarily while the charge is near to it. The rod is then removed. Which statement is correct?

AThe cap will be positively charged and the leaf will be negatively charged

BThe cap will be negatively charged and the leaf will be positively changed

CThe cap and the leaf will be positively charged

DThe cap and the leaf will be negatively charged

Enone

View Explanation & Discuss

Question 109

neco 2002

A man stands in front f a high wall and produces a sound. If he receives the echo of the sound four seconds later, what is his distance from the wall? [The speed of sound in air is 330ms^-1]

A1320m

B660m

C400m

D330m

E165m

View Explanation & Discuss

Question 110

neco 2002

If the size of the hole of a pinhole camera is increased, the image formed becomes

Abrighter and blurred

Bbrighter and larger

Cbrighter and sharper

Dblurred and duller

Eblurred and larger

View Explanation & Discuss

Question 111

neco 2002

If the temperature of a resistance wire is gradually increased, its resistance will

Adecrease gradually

Bfirst increase and then decrease

Cfirst increase and then remain the same

Dincrease gradually

Eremain the same

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Question 112

neco 2002

A body of weight 20N displaces 12N of the liquid in which it is immersed. What is the upthrust of the liquid on the body?

A240N

B32N

C20N

D12N

E8N

View Explanation & Discuss

Question 113

neco 2002

In which simple machine is the effort applied between the load and the fulcrum?

Aclaw hammer

Bnut crackers

Cpliers

Dsugar tongs

Ewheelbarrow

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Question 114

neco 2002

A body executing a simple harmonic motion has an angular velocity of 22 radians per second. If it has a maximum displacement of 10cm, what is its linear velocity?

A1100ms^-1

B440 ms^-1

C220 ms^-1

D22 ms^-1

E2.2ms^-1

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Question 115

neco 2002

A block of ice of mass 10kg at 0°C absorbs heat energy from its surroundings and changes to water at the same temperature. The heat absorbed is referred to as

Aheat capacity

Blatent heat

Cspecific heat

Dspecific heat capacity

Especific latent heat.

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Question 116

neco 2002

What part of the camera corresponds to the iris of the eye?

Adiaphragm

Bfilm

Cfocusing ring

Dlens

Eshutter

View Explanation & Discuss

Question 117

neco 2002

In which of the following are the substances arranged in descending order of their thermal conductivities?

Aaluminium, copper, iron

Baluminium, iron, copper

Ccopper, aluminium, iron

Dcopper, iron. aluminium

Eiron, copper, aluminium

View Explanation & Discuss

Question 118

neco 2002

Which statement is NOT correct about Rutherford’s model of the atom?

AThe diameter of the nucleus is of the order of 10-15m

BThe mass of an atom is concentrated in the nucleus

CThe model is applicable to atoms with one electron in the outer shell

DThe nucleus of an atom is positively charged

EThe nucleus is surrounded by an electron cloud.

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Question 119

neco 2002

A brass cube of side 10cm is heated through 30°C. If the linear expansivity of brass is 2.0 × I0\(^{-5}\) K-1 , what is the increase in its volume?

A0.06 cm³

B0.18cm³

C0.60cm³

D1.20cm³

E1.80cm³

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Question 120

neco 2002

A body of mass 4 kg is accelerated from rest by a steady force of 9N. What is its speed when it has travelled a distance of 8m?

A6 ms^-1

B18 ms^-1

C32 ms^-1

D36 ms^-1

E48 ms^-1

View Explanation & Discuss

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