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98 questions

Question 1 of 20 98 total questions

Question 1

waec 1988

During the same interval, it is observed that a train travels the same distance as does a lorry. The two vehicles therefore have the same

Auniform accelation

Binstateneous velocity

Cinitial velocity

Daverage speed

Eaverage velocity

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Question 2

waec 1988

Two radioactive elements A and B have half-lives of 100 and 50 years respectively. Samples of A and B initially contain equal amounts/number of atoms. What is the ratio of the number of the remaining atoms of A to that of B after 200 years?

A4 : 1

B2 : 1

C1 : 1

D1 : 2

E1 : 4

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Question 3

waec 1988

Which of the following is not an electromagnetic radiation?

AX-ray

BRadio waves

CSunlight

DSound waves

EInfra-red radiation

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Question 4

waec 1988

An electron of charge 1.6 x 10¹⁹C is accelerated in vacuum from rest at zero volt towards a plate of 40KV. Calculate the kinetic energy of the electron.

A4 x 10 ²⁵J

B4 x 10²¹ J

C6.4 x 10²⁰ J

D6.4 x 10^-15 J

E2.5 x 10²⁰ J

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Question 5

waec 1988

Which of the following is/are not affected by a magnetic field?
I. Neutrons
II. Cathode rays
III. Alpha particles

AI only

BII only

CIII only

DI & III only

EI, II & III

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Question 6

waec 1988

Which of the following is/are not correct about isotopes of an element? The have

Athe same neutron number

Bthe same proton number

Csame number of electrons

Dsame chemical properties

Edifferent physical poperties.

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Question 7

waec 1988

The unit of inductance is the

Afarad

Bhenry

Chertz

Dampere

Ecoulomb

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Question 8

waec 1988

Which of the following explains the concave meniscus of water in a glass tube?

AThe adhesion between water and glas is greater than the cohesion between water molecules

BThe cohesion between water molecule is greater than the adhesion between glass and water

CThe molecules of water in the glass are moving faster than the molecules in the other parts

DThe molecules of water at the water-air boundary are often attracted to the center of the tube

EThe weight of the water pulls the central part of the surface down

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Question 9

waec 1988

When sugar at the bottom of a glass of water gradually dissolves, the water level does not change applicably. Which of the following statements best describe this?

AWater is suitable solvent for sugar

BThe sugar and the water have become single solution

CThe volume of water molecule does not change when sugar dissolves.

DSugar molecule is small than that of water

EWater molecules are separated by large spaces between them

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Question 10

waec 1988

Which of the following particles of ray has the highest penetrating power?

ABeta particles

BAlpha particles

CGamma particles

DElectrons

ENeutrons

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Question 11

waec 1988

Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004m2 if the resistance is 3.0 Ω.

A0.0000267Ωcm

B0.006Ωcm

C0.26700Ωcm

D0.27500Ωcm

E0.060000Ωcm

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Question 12

waec 1988

Which of the following statement is not correct about loaded spiral spring?

AThe extension is proportional to the load applied, provided the elastic limite is not exceeded

BIf the elsatic limit is not exceeded, the contraction is proportional to the load removed.

CUp to the yield limit, extension is no longer proportional to the applied load.

DBeyond the elsatic limit, extension is no longer proportional to the applied load.

EIf the string regains its shape or form after deformation, it is said to be elastic.

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Question 13

waec 1988

What is the effect of using split-rings in a simple d.c motor?

AThe direction of rotation of the coil is reversed

BThe current in the coil flows in the same direction

CThe current in the coil becomes alternating

DThe direction of the force on the coil is reversed

EThe contact with the voltage is cut-off

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Question 14

waec 1988

A lamp is marked 220V 60 W. Calculate the energy it would consume when connected to a 220V source for 1 hour.

A216000J

B13200J

C3600J

D864J

E220J

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Question 15

waec 1988

It takes 4 minutes to boil a quantity of water electrically. How long will it take to boil same quantity of water using the same heating coil but with the current doubled? (neglecting any external heat loss).

A64 minutes

B32 minutes

C8 minutes

D2 minutes

E1 minute

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Question 16

waec 1988

Two parallel conductors carry equal currents in the same direction. Which of the following statement is not a correct observation?

AEach of teh conductors will experience a force

BEach of the conductors can move

CThe forces on the conductors will be equal

DThere are concentric lines of force around each conductor

EThe two conductors will repel each other

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Question 17

waec 1988

A battery of emf 24V and internal resistance 4Ω is connected to a resistor of 32Ω. What is the terminal p.d of the battery?

A24.0V

B21.3V

C16.0V

D2.7V

E2.0V

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Question 18

waec 1988

A cell can supply current of 0.8A and 0.4A through a 2Ω and a 3Ω resistors respectively. Calculate the internal resistance of the cell.

A0.2Ω

B0.4Ω

C1.0Ω

D3.0Ω

E9.0Ω

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Question 19

waec 1988

Local action is normally prevented from taking place in a simple electric cell by

Aintroducing an oxidising agent into the acid

Bnot drawing current continuously for long periods

Camalgamating the surface of the zinc plate

Dusing a porous pot to isolate the zinc plate from the acid

Eusing dilute sulphuric acid

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Question 20

waec 1988

A transformer with 5500 turns in its primary is used between a 240V a. c supply and a 120V kettle. Calculate the number of turns in the secondary

A11000

B2750

C460

D232

E10

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