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2,483 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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2,483 questions

Question 1 of 20 2,483 total questions

Question 1021

jamb 1987

A wave has a frequency of 2Hz and a wavelength of 30cm. The velocity of the wave is

A60.0ms^-1

B6.0ms^-1

C1.5ms^-1

D0.6ms^-1

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Question 1022

jamb 1987

Calculate the amount of heat required to convert 2kg of ice at 2^oC to water at 0^oC. [specific heat capacity of ice = 2090Jkg^-1 ^oC^-1, specific latent heat of fusion of ice = 333kJkg^-1]

A666J

B8360J

C666 000J

D674 360J

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Question 1023

jamb 1987

Which of the following phenomena explains the fact that a house whose roof is coated with white paint will be cooler in the hot season than one coated with black paint ?

Aconduction

Bconvection

Crefraction

Dreflection

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Question 1024

jamb 1987

The vacuum in a thermos flask helps to reduce heat transfer by?

Aconvection and radiation

Bconvection and conduction

Cconduction and radiation

Dradiation only

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Question 1025

jamb 1987

In which of the following are the substance arranged in descending order of their thermal conductivities?

Acopper, steel, glass

Bsteel, copper, glass

Csteel, glass, copper

Dcopper, glass, steel

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Question 1026

jamb 1987

22,000J of heat is required to raise the temperature of 1.5kg of paraffin from 20^oC to 30^oC. Calculate the specific heat capacity of paraffin.

A1466Jkg^-1 ^oC^-1

B2933Jkg^-1 ^oC^-1

C4400Jkg^-1 ^oC^-1

D5866Jkg^-1 ^oC^-1

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Question 1027

jamb 1987

Hot water is added to three times its mass of water at 10oC and the resultant temperature is 20oC. What is the initial temperature of the hot water?

A100^oC

B80^oC

C50^oC

D40^oC

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Question 1028

jamb 1987

As a result of air at the top of a barometer, the height of the mercury column is 73.5cm when it should be 75.0cm; the volume of the space above the mercury is 8.0cm3. Calculate the correct barometer height when the barometer reads 74.0cm and the volume of the space above the mercury is 6.0cm3.

A72.0cm

B74.5cm

C75.1cm

D76.0cm

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Question 1029

jamb 1987

The length of a side of a metallic cube at 20ºC is 5.0cm. Given that the linear expansivity of the metal is 4.0 x 10\(^{-5}\)k\(^{-1}\), find the volume of the cube at 120°C.

A126.50cm³

B126.25cm³

C126.00cm³

D125.00cm³

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Question 1030

jamb 1987

The distance between the fixed points of a centigrade thermometer is 20cm. What is the temperature when the mercury level is 4.5cm above the lower mark?

A22.5^oC

B29.0^oC

C90.0^oC

D100.0^oC

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Question 1031

jamb 1987

A cube of side 10cm and mass 0.5kg floats in a liquid with only \(\frac{1}{5}\) of its height above the liquid surface. What is the relative density of the liquid?

A0.125

B0.250

C0.625

D2.500

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Question 1032

jamb 1987

A load of 5N gives an extension of 0.56cm in a wire which obeys Hooke's law. What is the extension caused by a load of 20N?

A1.12cm

B2.14cm

C2.24cm

D2.52cm

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Question 1033

jamb 1987

The mechanical advantage(MA) of an inclined plane depends on

Aits length

Bits height

Cthe product of its length and height

Dthe ratio of its length to its height

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Question 1034

jamb 1987

If a beaker is filled with water it is observed that the surface of the water is not horizontal at the glass-water interface. This behavior is due to

Afriction

Bviscosity

Csurface tension

Devaporation

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Question 1035

jamb 1987

The coefficient of static friction between a 40kg crate and concrete surface is 0.25. Find the magnitude of the minimum force needed to keep the crate stationary on the concrete base inclined at 45o to the horizontal. [G = 10ms-1]

A400N

B300N

C283N

D212N

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Question 1036

jamb 1987

A body rolls down a slope from a height of 100m. its velocity at the foot of the slope is 20ms^-1. What percentage of its initial potential energy is converted into kinetic energy? [g = 10ms^-1]

A40%

B35%

C20%

D15%

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Question 1037

jamb 1987

A constant force of 40N acting on a body initially at rest gives an acceleration of 0.1ms^-2 for 4s. Calculate the work done by the force

A8J

B10J

C32J

D160J

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Question 1038

jamb 1987

An elevator of mass 4800kg is supported by a cable which can safely withstand a maximum tension of 60 000N. The maximum upward acceleration the elevator can have is

A2.5ms^-2

B5.0ms^-2

C7.5ms^-2

D10.0ms^-2

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Question 1039

jamb 1987

A man walks 8km north and then 5km in a direction 60^o east of north. Find the distance from his starting point

A11.36km

B12.36km

C13.00km

D14.36km

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Question 1040

jamb 1987

A jet engine develops a thrust of 270Ns when the velocity of the exhaust gases relative to the engine is 300ms^-1. What is the mass of the material ejected per second?

A81.00kg

B9.00kg

C0.90kg

D0.09kg

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