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46 questions

Question 1 of 20 46 total questions

Question 1

waec 2013

An electric circuit is connected as illustrated above. Determine the equivalent e.m.f and current flowing through the circuit respectively, neglecting the internal resistance of the cells

A2V, 1.0A

B2V, 4.0A

C6V, 0.3a

D6V, 3.0a

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Question 2

waec 2013

The diagram above illustrates a waveform. Which of the point on the waveform are in phase?

AP and R

BR and T

CP and T

DQ and S

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Question 3

waec 2013

The outlet of a bicycle pump is used to inflate a football as illustrated in the diagram above. Why does the pressure of the air inside the pump increases as the pump handle is slowly pushed downward at constant temperature?

Amomentum of the air molecules are increased

Bvolume occupied by the molecules are increased

Cfrequency of collision of the air molecules with the walls of the pump is increased

Dmore air molecules are collidin with one another in the system

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Question 4

waec 2013

Four co-planar forces of magnitudes 10N, 17N, 6N and 20N act at point O as shown in the above diagram. Determine the magnitude of the resultant force

A53.N

B21.0N

C7.0N

D5.0N

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Question 5

waec 2013

A block of wood of mass 5kg is pulled on a platform by a force of 40N as illustrated in the diagram above. If the frictional force, F experienced by the block is 12N, calculate the magnitude of the acceleration of the acceleration of the block

A2.4ms^-2

B5.6ms^-2

C8.0ms^-2

D2.4ms²

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Question 6

waec 2013

Which of the following phenomena supports the theory that waves have a particle nature?

Aelectron diffraction

Bphotoelectric effect

Cdiffraction of light

Dx-ray interference

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Question 7

waec 2013

Which of the following statements about the use of radioisotopes is not correct? They are used to

Ainduce mutations in plants and animals to obtain new and improved varieties

Btrace the paths of metabolic processes in plants and animals

Cestmate the age of rocks

Dlocate broken bones

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Question 8

waec 2013

Which of the following particles are termed nucleons in a neutral atom?

Aprotons and neutrons

Bneutrons and electrons

Cprotons and electrons

Dprotons, electrons and neutrons

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Question 9

waec 2013

The minimum energy required to cause photoelectric emission when the surface of a metal is irradiated with electromagnetic radiation of suitable frequency is called

Acritical energy

Bionization energy

Cwork function

Dplanck's constant

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Question 10

waec 2013

The work function of a metal is 2.56 x 10^-19J. Calculate the frequency of a photon whose energy is required to eject from the metal an electron with kinetic energy of 3.0ev. [1 eV = 1.6 x 10^-19J, h = 6.6 x 10^-34Js]

A5.56 x 10¹⁹Hz

B1.66 x 10¹⁹Hz

C1.12 x 10¹⁵Hz

D8.42 x 10¹⁴Hz

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Question 11

waec 2013

A coil of inductance 0.12 H and resistance 4\(\Omega\), is connected across a 240V, 50Hz supply. Calculate the current through it. [\(\pi\) = 3.142]

A6.3A

B33.3A

C37.2A

D40.0A

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Question 12

waec 2013

Which of the following devices does not makes use of eddy current for its action? A/An

Agalvanometer

Bspeedometer

Cinduction furnace

Dinduction coil.

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Question 13

waec 2013

The capacitance of parallel plates capacitors varies

Ainversely as the square of the distance between the plates

Bdirectly as the square of the distance between the plates

Cinversely as the distance between the plates

Ddirectly as the distance between the plate

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Question 14

waec 2013

Which of the following instruments is used to determine the accurate value of the electromotive force of a cell?

Avoltmeter

Bmeterbridge

Cvoltameter

Dpotentiometer

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Question 15

waec 2013

A potential difference of 12V is applied across the ends of a 6\(\Omega\) resistor for 10 minutes. Determine the quantity of heat generated

A720J

B1200J

C14400J

D43200J

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Question 16

waec 2013

A charge of 2.0 x 10\(^{-5}\) C experiences a force of 80N in a uniform electric field. Calculate the magnitude of the electric field intensity

A8.0 x 10⁶ NC^-1

B4.0 x 10⁶ NC^-1

C4.0 x 10⁴ NC^-1

D2.0 x 10⁴ NC^-1

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Question 17

waec 2013

When a person holds a negatively charges metal rod and stands bare-footed on the ground, how will the charges leak?

Anegative charges flows to the ground through the person's body

Bpositive charges flow from the ground through his body to neutralize the negative charges

Cpositive charges in the air neutralizes the negative charges the person is holding

Dnegative charges will leak through the air

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Question 18

waec 2013

Which of the following statements about waves in pipes is correct?

Afor open pipes, there is only one end correction to be accounted for

Bfor closed pipes, there are two end corrections to be accounted for

Conly odd harmonics are possible in closed pipes

Dall harmonics are possible in closed pipes

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Question 19

waec 2013

A string under tension produces a note of frequency 14Hz. Determine the frequency when the tension is quadrupled.

A14Hz

B18Hz

C28Hz

D56Hz

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Question 20

waec 2013

Which of the following radiations has it's frequency lower than that of infrared radiation?

AUtra-violet rays

Bgamma rays

Cx-rays

Dradio waves

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