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99 questions

Question 1 of 20 99 total questions

Question 11

waec 2010

A lens that is thinner at the middle and thicher at the edges is

Adiverging

Bconverging

Cplano-convex

Dconverging meniscus

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Question 12

waec 2010

A ray of light travels from air to water. The refeactive index of water is given by the expression

A\(\frac{\text{velocity in water}}{\text{velocity in air}}\)

B\(\frac{\text{sine of angle of refraction}}{\text{sine of angle of incidence}}\)

C\(\frac{\text{apparent depth}}{\text{real depth }}\)

D\(\frac{\text{wavelength in air}}{\text{wavelength in water}}\)

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Question 13

waec 2010

From the diagram, the correct equation for the refractive index n of the medium is

An = tan i

Bn = \(\frac{sin i}{sin 90^o}\)

Cn = \(\frac{sin i}{cos (90^o - i)}\)

Dn = sin 90^oC

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Question 14

waec 2010

When an object is placed at the principal focus of a concave mirror, the location of the image formed is

Abetween principal focus and pole

Bbetween principal focus and centre of curvature

Cat infinity

Dat centre of curvature

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Question 15

waec 2010

The following devices use plane mirrors in their operations, except

Aperiscope

Bsextant

Ckaleidoscope

Dbinoculars

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Question 16

waec 2010

The ability of a wave to spread around corners is called

Apolarisation

Bdispersion

Cdiffraction

Dreflection

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Question 17

waec 2010

A certain wave has a speed of 20ms^-1. If the frequency of the wave is 0.25Hz, calculate the distance between successive crests of the wave

A5.0m

B40.0m

C50.0m

D80.0m

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Question 18

waec 2010

Dew point is not affected by

Atemperature

Bwind

Cthe amount of water vapour in the atmosphere

Datmospheric pressure

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Question 19

waec 2010

A solid of mass 0.5kg initially at 50^oC melts at 60^oC. Calculate the quantity of heat required to melt it completely. [specific heat capacity of the solid =2.0KJ kg^-1K^-1][Specific latent heat of fusion of solid =1.0 KJ kg^-1]

A1500J

B10000J

C10500J

D15000J

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Question 20

waec 2010

An electric drill rated 400W is used to drill a hole in copper of mass 400g in 20s. Calculate the rise in temperature if all the heat produced is absorbed by the copper. [specific heat capacity of copper = 400Jkg^-1K^-1]

A100^oC

B75^oC

C50^oC

D45^oC

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Question 21

waec 2010

Specific heat capacity 36.4 Jkg-1 K-1 of a body means that when 36.4J of heat energy is supplied to a body of

Amass 100kg the temperature rises by 1k

Bmass 1kg, the temperature by 1000K

Cmass 1kg, the temperature rises by 1K

Dmass 100kg, the temperature rises by 1000k

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Question 22

waec 2010

The pressure P, volume V, and absolute temperature T of a given mass of an ideal gas change simultaneously. Which of the followng equations is correct about the gas?

APV = \(\frac{constant}{T}\)

B\(\frac{P}{T} = Constant\)

C\(\frac{P}{V} = \frac{constant}{T}\)

D\(\frac{I}{T} = \frac{constant}{PV}\)

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Question 23

waec 2010

In a thermos flask, heat loss by radiation is minimizes by the

Asilvered surfaces

Bvacuum within the doubled walls

Cplastic stopper

Dcork support

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Question 24

waec 2010

The advantages of the thermoelectric thermometer include the following characteristics except that it

Acan measure rapidly changing temperatures

Bcan measure high and low temperature

Ccan measure high and low temperature almost at a point

Dis fairly sensitive

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Question 25

waec 2010

a thermometer records 680 mmHg at steam point and 440 mmHg at ice point. The temperature it records at 380 mmHg is

A-25^oC

B-20^oC

C20^oC

D25^oC

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Question 26

waec 2010

a machine is said to be a third class lever when the

Aload is between the fulcrum and effort

Bfulcrum is between the effort and the load

Ceffort is between the fulcrum and load

Dfulcrum is directly below the load

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Question 27

waec 2010

Which of the following sources of energy is/are exhausible? i. Solar ii. Fossil fuels iii. Tidal power

Aii, and iii

Bi and ii only

Ci and iii only

Dii only

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Question 28

waec 2010

A moving body of mass 25.0kg undergoes a uniform retardation of 20.0ms^-2. Calculate the magnitude of the retardating force

A1.25N

B8.00N

C45.00N

D500.00N

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Question 29

waec 2010

A vertical string, suspended from a fixed point and having a small mass attached to the free end is set into oscillations. Which of the following statements about the system are correct? i. The potential energy of the mass is a minimum at the middle of the swing ii. Its kinetic energy is a maximum at the middle of the swing iii. The sum of the potential and kinetic energies is constant throughout the swing

Ai,ii and iii

Bi and ii only

Cii and iii only

Di and iii only

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Question 30

waec 2010

simple harmonic oscillator has a period of 0.02s and amplitude of 0.25m. Calculate the speed in ms^-1 at the centre of the oscillation

A125\(\pi\)

B25.00\(\pi\)

C100.00 \(\pi\)

D400.00\(\pi\)

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