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46 questions

Question 1 of 20 46 total questions

Question 11

neco 2000

To keep a lorry moving at a constant speed v, requires power p, from the engine. The force provided by the engine is

A\(\frac{1}{2}\)v

Bpv

C\(\frac{p}{v}\)

Dpv²

E\(\frac{p}{v^2}\)

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Question 12

neco 2000

A man at the back of a crowd watches a parade by holding a plane mirror just above his head. The parade passes 6 metres behinde his head and the mirror is 0.25m in front of the man. How far does the image in the mirror appear to be from the man?

A6.50m

B6.25m

C6.00m

D5.75m

E5.50m

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Question 13

neco 2000

The unit of inductance is

AWeber

BTelsa

CHertz

DHenry

EFarad

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Question 14

neco 2000

A wave travels a distance of 20 cm in 3s. The distance between successive crests of the wave is 4cm. What is the frequency of the wave?

A0.60Hz

B1.67Hz

C7.50Hz

D15.00Hz

E26.67Hz

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Question 15

neco 2000

If a positively charged glass-rod is used to charge an electroscope X by contact and an electroscope Y by induction, then

AX and Y will be negatively charge

BX and Y will be positively charged

CX will be negatively charged and Y positively charged

DX will be positively charged and Y negatively charged

EX will be positively charged and Y will remain uncharged

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Question 16

neco 2000

The clinical thermometer differs from other mercury-in-glass thermometers because it has

I. a constriction
II. a wide range
III. a short range
IV. a narrow bore.

Which of the above are correct?

AI and II only

BI and III only

CIII and IV only

DI,II and III only

EI, III and IV only

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Question 17

neco 2000

In a simple pendulum experiment, a boy observed that the times for 30 oscillations are 70.0s, 72.0s and 67.0s respectively. Calculate the mean period of oscillation of the pendulum.

A0.14s

B0.43s

C2.32s

D2.40s

E6.97s

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Question 18

neco 2000

Which of the following is NOT part of an a.c generator?

ACommutator

BArmature

CField magnet

DCarbon brushes

ESlip rings

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Question 19

neco 2000

A radioactive substance has a half-life of 3 minutes. After 9 minutes, the count rate was observed to be 200. What was the count rate at zero time?

A200

B1200

C1600

D2400

E4800

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Question 20

neco 2000

Two forces forming a couple are separated by a distance of 25cm. If one of the forces equals 40N, what is the moment of the couple?

A1000 Nm

B500 Nm

C10 Nm

D5 Nm

E1.6 Nm

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Question 21

neco 2000

A solid weights 5.0 N in air, 4.2 N in water and 4.4 N in liquid Y. Calculate the relative density of liquid Y.

A0.75

B0.88

C0.95

D1.13

E1.33

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Question 22

neco 2000

The heat from a fire in a closed room reaches someone far away in the room, mainly by

Areflection

Bdiffusion

Cconduction

Dradiation

Econvection

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Question 23

neco 2000

400g of cold water is added to 200g of water at 70°C. If they are properly mixed and the temperature of the mixture is 30°C. calculate the initial temperature of the cold water. (Neglect the heat absorbed by the container)

A10°C

B15°C

C20°C

D30°C

E40°C

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Question 24

neco 2000

The force exerted on a charged body in an electric field depends on

I. the charge on the body
II. the electric field intensity
III. the square of the mass of the body

AI only

BII only

CI and II only

DI and III only

EII and III only

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Question 25

neco 2000

An element of nuclear number A and proton number Z emits an alpha particle from its nucleus. The nucleon number and the proton number of the new element formed are respectively

A(A – 2) and (Z – 2)

B(A + 4) and (Z + 2)

C(A– 4) and (Z+2)

D(A+ 4) and (Z – 2)

E(A – 4) and (Z – 2)

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Question 26

neco 2000

The specific heat of a substance in the solid state is C₁; its specific beat in the liquid state is C₂ and its latent heat of fusion is L. If a mass M of the substance is changed from the solid state at temperature T, to the liquid state, also at temperature T, the amount of heat required will be

AM(C₁ ÷ C₂) x T

BML

DM(C₁ + C₂) × T ÷ ML

EML(C₁ + C₂ ÷ 2) × T

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Question 27

neco 2000

When a lever is in equilibrium, under the action of two or more forces, the algebraic sum of the moments of the forces about the point of support is

Aanti-clockwise

Bclockwise

Cequal to the product to the forces

Dnumerically equal to the total forces acting

Eequal to zero

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Question 28

neco 2000

What is the coefficient of static friction between a load of mass 2kg and a horizontal surface, if the limiting frictional force is 10N? (g = 10 ms^-2)

A0.2

B0.5

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Question 29

neco 2000

A gas occupies a certain volume at 27°C. At what temperature will its volume be twice times the original volume assuming that its pressure remains constant?

A54°C

B108°C

C150°C

D327°C

E600°C

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Question 30

neco 2000

When electrical power is transmitted over long distances, the voltage is stepped up so that

Athe resistance of the wire may be increased proportionately to the potential difference

Bthe time of transmissions between the generating and the receiving stations may be reduced

Cthere is increased current to produce brighter lights.

Dthe rate of electrical consumption is increased.

Ethe energy waste may be minimised as the current is lowered.

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