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1,904 questions

Question 1 of 20 1,904 total questions

Question 381

waec 2010

The following devices use plane mirrors in their operations, except

Aperiscope

Bsextant

Ckaleidoscope

Dbinoculars

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Question 382

waec 2010

The ability of a wave to spread around corners is called

Apolarisation

Bdispersion

Cdiffraction

Dreflection

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Question 383

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 384

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 385

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 386

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 387

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 388

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 389

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 390

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 391

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 392

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 393

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 394

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 395

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 396

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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Question 397

waec 2010

Which of the following statements best describes a rigid body? A body which

Ais not equally deformed

Bwhen deformed regains it shape

Cis brittle

Dwhen deformed remains deformed

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Question 398

waec 2010

a body is projected horizonatlly from the top of a cliff 45m above the ground. if the body lands at a distance 30m from the foot of the cliff, calculate the speed of projection. [g = 10ms-2]

A10ms^-1

B15ms^-1

C20ms^-1

D30ms^-1

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Question 399

waec 2010

The average speed of an object is determined by dividing the sum of its initial and final speeds by two only when the acceleration is

Achanging

Buniform

Cincreasing

Ddecreasing

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Question 400

waec 2010

Two cars X and Y travelling in opposite directions along the same high way at uniform velocities 110 kmh^-1 and 90kmh^-1 respectively pass each other at a certain point. The velocity of X relative to Y at the time they pass each other is

A200 kmh^-1

B100 kmh^-1

C40 kmh^-1

D20 kmh^-1

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