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48 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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48 questions

Question 1 of 20 48 total questions

Question 11

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 12

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 13

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 14

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 15

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 16

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 17

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 18

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 19

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 20

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 21

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 22

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 23

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 24

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 25

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 26

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 27

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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Question 28

waec 2002

An object A is held in equilibrium as illustrated in the diagram above. Using the data on the diagram determine the magnitude, W of the weight of

A23N

B17N

C7N

D5N

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Question 29

waec 2002

An object is acted upon by a system of parallel forces causing the object to be in static equilibrium. Which of the following statements is not correct?

AThe resultant of the parallel force is zero

Bthe algebraic sum of the moment of the forces is zero

Call the parallel forces must be equal in magnitude and in direction

Dthe sum of the forces in one direction must be equal to the sum of forces in the opposite direction

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Question 30

waec 2002

An object is released from rest at a height of 25m. Calculate the time it takes to fall to the ground. [g = 10ms^-2]

A25.00s

B10.00s

C2.50s

D2.24s

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