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48 questions

Question 1 of 20 48 total questions

Question 11

jamb 1987

An object 3.0cm high is placed 60.0cm from a converging lens whose focal length is 20.0cm. Calculate the size of the image formed

A0.5cm

B1.5cm

C2.0cm

D6.0cm

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Question 12

jamb 1987

If an object is placed in front of two mirrors inclined at 90o, how many images will be formed?

Afive

Bfour

Cthree

Dtwo

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Question 13

jamb 1987

When the length I of a piece of wire under constant tension is varied, the relationship of the frequency of the vibration f\(\alpha\)/ is

Af\(\alpha\)/

Bf\(\alpha \frac{1}{I^2}\)

Cf \(\alpha\sqrt I\)

Df\(\alpha \frac{1}{1}\)

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Question 14

jamb 1987

Which of the following statements supports the assumption that light travels in straight lines?

Alight can be diffracted

Ba source of light produces distinct shadows of opaque objects

Ca source of light produces interference patterns on a suitably placed screen

Dlight can be reflected

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Question 15

jamb 1987

The lowest note emitted by a stretched string has a frequency of 40Hz. How many overtones are there between 40Hz and 150Hz?

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Question 16

jamb 1987

Which of the following instruments has a pure tone?

Aguitar

Bvibrating strings

Ctuning fork

Dsiren

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Question 17

jamb 1987

A boat at anchor is rocked by waves whose crest are 100m apart and whose velocity is 25ms^-1. At what interval does the wave crest reach the boat?

A2500.00s

B75.00s

C4.00s

D0.25s

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Question 18

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 19

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 20

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 21

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 22

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 23

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 24

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 25

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 26

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 27

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 28

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 29

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 30

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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