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1,904 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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1,904 questions

Question 1 of 20 1,904 total questions

Question 571

waec 2002

When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon can be called

Abeats

Bdiffraction

Covertones

Dresonance

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Question 572

waec 2002

A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560ms^-1]

A312.0m

B156.0m

C78.0m

D31.2m

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Question 573

waec 2002

In a compound microscope, the image formed by the objective lens is at a distance of 3.0cm from the eye lens. If the final image is at 25.0cm from the eye lens, calculate the focal length of the eye lens

A0.3cm

B2.7cm

C3.4cm

D8.3cm

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Question 574

waec 2002

A converging lens of focal length 15cm forms a virtual image at a point 10cm from the lens. Calculate the distance of the object from the lens

A10.00cm

B6.00cm

C5.00cm

D1.50cm

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Question 575

waec 2002

The refractive index of a medium relative to air is 1.8. Calculate to the nearest degree, the critical angle for the medium

A68^o

B56^o

C34^o

D18^o

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Question 576

waec 2002

The size of the hole of a pin hole camera is increased. The resultant image formed becomes

Asharper

Breduced in size

Cenlarged

Dblurred

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Question 577

waec 2002

In the wave equation y = E_o, sin(299t - \(\pi\)), E_o represents the

Aamplitude

Bfrequency

Cperiod

Dwavelength

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Question 578

waec 2002

A radio wave has a wavelength of 150m. If the velocity of radio waves is free spaces is 3 x 10\(^8\) ms\(^{-1}\), calculate the frequency of the radio wave

A4.50 x 10¹⁰Hz

B5.0 x 10⁹Hz

C4.5 x 10⁹Hz

D2.0 x 10⁶Hz

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Question 579

waec 2002

A slinky spring fixed at one end is placed horizontally on a table. The free end is displaced parallel to the table and then released. The resultimg wavelength is

Atransverse

Blongitudinal

Cstationary

Delectromagnetic

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Question 580

waec 2002

What type of motion does the skin of a 'talking' drum perform when it is struck with a drum stick?

ARandom

BRational

CTranslational

Dvibratory

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Question 581

waec 2002

Calculate the energy required to vapourise 50g of water initially at 80oC.[specific heat capacity of water = 4.2Jg-1K-1][specific latent heat of vaporisation of water = 2260Jg-1]

A113,000J

B117,200J

C234,400J

D420,000J

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Question 582

waec 2002

Water of mass 120g at 50oC is added to 200g of water at 10oC and the mixture is well stirred. Calculate the temperature of the mixture. [Neglect heat losses to the surrounding]

A60^oC

B40^oC

C25^oC

D10^oC

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Question 583

waec 2002

The silver coating on the inside of a vacuum flask reduces heat loss by

Aconduction

Bradiation

Ccondensation

Dconvention

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Question 584

waec 2002

The ice and steam points of a certain thermometer are -20° and 100° respectively. Calculate the Celsius temperature corresponding to 70° on the thermometer

A84.0^o

B75.0^o

C64.0^o

D58.0^o

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Question 585

waec 2002

Which of the following actions will improve the efficiency of the pulley system?

Areducing the mass of the pulley

Bincreasing the friction force between the string and the pulley

Cincreasing the mass per unit length of the string of the pulley

Dincreasing the mass of the pulley

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Question 586

waec 2002

A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantages

A12.0

B10.0

C3.6

D1.8

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Question 587

waec 2002

a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms^-2]

A60W

B80W

C100W

D120W

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Question 588

waec 2002

Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved

Aparallel to the line of action of the force from a reference point

Bperpendicular to the line of action of the force from a reference point

Con a line through the reference point

Dby the object

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Question 589

waec 2002

In the diagram above, AB represents a uniform rod of length 1.50m which is in equilibrium on a pivot at P, If AP = 40cm, calculate the mass of the rod. [g = 10ms^-2]

A0.280kg

B0.400kg

C0.613kg

D0.800kg

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Question 590

waec 2002

A spiral spring of natural length 30.0cm and force constant of 20Nm^-1 is compressed to 20.0cm. Calculate the energy stored in the spring

A0.1J

B1.0J

C10.0J

D100.0J

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