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Past Questions

47 questions

Question 1 of 20 47 total questions

Question 1

waec 2012

Which of the following radiations emitted in radioactive decay has momentum, a fairly high penetrating power and is deflected by a magnet?

Aalpha particles

Bbeta particle

Cgamma radiation `

DX-radiation

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Question 2

waec 2012

Which of the following arrangements of radiations is in the order of decreasing penetrating power?

A\(\alpha\), \(\beta\), \(\gamma\)

B\(\alpha\), \(\gamma\), \(\beta\)

C\(\gamma\), \(\beta\), \(\alpha\)

D\(\beta\), \(\gamma\), \(\alpha\)

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Question 3

waec 2012

Which of the following statements about X-rays is correct? X-rays

Aare produced when a metal surface is irradiated with ultraviolet light

Bare produced when a metal target is used to block fast miving electrons

Chave long wavelengths and are therefoer very penetrating

Dare not part of the electromagnetic spectrum

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Question 4

waec 2012

A metal with a work function of 3.0ev is irradiated with ultraviolet light of energy 4.0 ev. The kinetic energy of the ejected electron is

A1.0eV

B3.0eV

C4.0eV

D7.0eV

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Question 5

waec 2012

An atom in an excited state is one whose

Apotential energy is minimum

Bpotential energy is maximum

Celectron are in the conduction band

Delectron have moved to higher energy level

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Question 6

waec 2012

In a R-C circuit

AI^rms leads V^rms by 60^o

BI^rms slags V^rms by 60^o

CV^rms lags I^rms by 90^o

DV^rms leads I^rms by 90^o

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Question 7

waec 2012

An inductor is connected to a 24V, 50Hz mains supply. If the current through the inductor is 1.5A, calculate the inductance of the inductor (\(\pi = \frac{22}{7}\))

A8.0 x 10²H

B7.5 x 10^oH

C1.6 x 10^oH

D5.1 x 10^-2H

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Question 8

waec 2012

Which of the following modes is the most economical method of transmitting electrical power over long distances?

Aalternating current at low voltage and high current

Balternating current at high voltage and high current

Calternating current at high voltage and low current

Ddirect current at low voltage and high current

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Question 9

waec 2012

the core of a transformer is usually laminated in order to

Areduce magnetic leakage

Breduce eddy current

Cprevent vibration of the transformer

Dmake magnetic reversal in the core much easier

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Question 10

waec 2012

The magnetic relay is a device used for

Atiming in sports

Bstoring magnetic field

Creadin the magnitude of magnetic flux

Dcontrolling another circuit carrying larger current

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Question 11

waec 2012

A 12\(\Omega\) resistor dissipates 8kJ of heat in 20s. Calculate the current through the resistor

A5.8A

B6.9A

C30.0A

D33.3A

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Question 12

waec 2012

Two similar cells are used to light two similar lamps as illustrated in the diagrams above. In which of the circuit diagrams are the lamps brightest?

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Question 13

waec 2012

Six dry cells each of e.m.f. 2.0 and internal resistance of 1.0\(\Omega\) are connected in parallel across a load of 3.0\(\Omega\). Calculate the effective current in the circuit.

A0.63A

B0.50A

C0.31A

D0.22A

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Question 14

waec 2012

Which of the following properties is an advantage of lead-acid accumulator over an alkaline accumulator?

Apossesses low internal resistance

Bcan be recharges

Chas shorter life span

Dpossesses high e.m.f

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Question 15

waec 2012

Two capacitors, each of capacitance 2\(\mu\)F are connected in parallel. If the p.d across them is 120V, calculate the charge on each capacitor

A6.0 x 10^-5C

B1.2 x 10^-4C

C2.4 x 10^-4C

D4.8 x 10^-4C

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Question 16

waec 2012

When two like charges are brought together, the potential energy of the system formed will

Aincrease because work is done against the field

Bincrease because work is done by the field

Cdecrease because work is done by the field

Ddecrease because work is done against the field

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Question 17

waec 2012

Which of the following sets of coloured light is/are secondary colours i. Red, Blue and green ii. Blue, cyan and magneta iii. Green, Magenta and yellow, IV Yellow, Cyan and Magenta

Ai and ii only

Bii and iii only

Civ only

Di, ii and iv only

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Question 18

waec 2012

The sound heard by a person after the reflection of the sound generated by him is called

Areverberation

Bresonance

Cecho

Daudibility

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Question 19

waec 2012

A telescope is said to be in normal adjustment when the

Afocal length of he objective is greater than that of the eyepiece

Bfocal length of the eyepiece is greater than that of the objective

Cfocal length of the eyepiece is equal to that of the objective

Dobjective focal point coincides wih that of the eyepiece

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Question 20

waec 2012

An object is placed 10cm from a converging lens of foal length 15cm. Calculate the magnification of the image formed

A3.0

B1.5

C0.6

D0.3

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