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89 questions JAMB 2483 WAEC 1904 NECO 322 CUSTOM 10

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89 questions

Question 1 of 20 89 total questions

Question 11

waec 2014

The functional difference between a lens and a mirror is that a lens

Areflects a beam of light while a mirror refracts it

Brefracts a beam of light while a mirror reflects it

Cabsorbs incident rays while a mirror transmit them

Dtransmits incidents ray whle a mirror absorbs them

View Explanation & Discuss

Question 12

waec 2014

Which of the following relations about the focal length f_o of the objective and focal length f_e of the eye piece of a compound is correct?

Af_o = f_e

Bf_o < f_e

Cf_o > f_e

Df_e = 2f_o

View Explanation & Discuss

Question 13

waec 2014

Refraction of lights differs from reflection in that, in refraction i. at least two media are involved ii. there is a change in the direction of the ray iii. the speed of the ray changes. Which of the statements above is/are correct?

Ai only

Bi ad ii only

Cii and iii only

Di and iii only

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Question 14

waec 2014

A transverse wave can be distinguished from a longitudinal wave by

Adiffraction

Brelection

Crefraction

Dpolarization

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Question 15

waec 2014

The quality of a note depends on its

Afrequency

Bpitch

Covertones

Damplitude

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Question 16

waec 2014

A car traveling at 30ms\(^{-1}\) overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kW]

A0.23hp

B0.40hp

C4.00hp

D4.40hp

View Explanation & Discuss

Question 17

waec 2014

The mass of an empty density bottle is 30g. When filled with a liquid, the mass of the bottle and the liquid is 40g. On heating the filled bottle through 40ºc, the mass reduces to 38g. Calculate the apparent cubic expansivity of the liquid

A6.25 x 10K^-1

B6.25 x 10^-3K^-1

C2.50 x 10^-3K^-1

D2.50 x 10^-4K^-1

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Question 18

waec 2014

A quantity of water at 20^oC is mixed with another quantity of water at 70^oC. The final steady temperature of the mixture is 40^oC. Determine the ratio of the mass of the cold water to that of the hot water

A7:2

B3:2

C2:5

D1:2

View Explanation & Discuss

Question 19

waec 2014

A body of mass M kg rests on a plane inclined at an angle \(\theta\) to the horizontal. The component of the weight of the body parallel to the plane is

AMg sin \(\theta\)

BMg cos \(\theta\)

CMg tan \(\theta\)

DMg sec \(\theta\)

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Question 20

waec 2014

Which of the following types of thermometers can be used to measure a range of temperature from -50°C to 50°? i. Clinical ii. Mercury iii. Alcohol-in-glass

Ai only

Bii only

Ciii only

Di and ii only

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Question 21

waec 2014

The change of state from solid to liquid occurs

Aat constant temperature

Bwhen temperature is lower than the boiling point

Cwhen temperature is just near freezing point

Dwhen temperature is equal to the boiling point

View Explanation & Discuss

Question 22

waec 2014

The temperature at which the water vapor in the air saturates the air and begins to condense is known as

Adew point

Bcritical point

Cboiling point

Dtriple point

View Explanation & Discuss

Question 23

waec 2014

Heat transfer by conduction is similar to wave motion because

Athere is increase in temperature

Btransfer of materials is involved

Ccharged particles vibrates at right angles

Dno transfer of materials is involved

View Explanation & Discuss

Question 24

waec 2014

A screw-jack has the distance between its successive threads as P and the length of its tommy bar as r. Its velocity ratio is given by the expression

A\(\frac{2 \pi r^2}{P}\)

B\(\frac{2 \pi r}{P}\)

C\(\frac{2 \pi}{rp}\)

D\(\frac{P}{2 \pi r}\)

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Question 25

waec 2014

The S.I unit of power is

BPa

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Question 26

waec 2014

A device that converts mechanical energy into electrical energy is

Aa dynamo

Ban electric motor

Can induction coil

Da transformer

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Question 27

waec 2014

Alcohol of mass 21g and density 0.7g cm^-3 is mixed with 10g of water. Determine the density of the mixture [density of water = 1.0gcm^-3]

A0.775gcm^-3

B0.875gcm^-3

C0.780gcm^-3

D0.880gcm^-3

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Question 28

waec 2014

The period of a simple pendulum X is 5s. What is the period of a simple pendulum Y which makes 50 vibrations in the same time it takes X to make 20 vibrations?

A12.5s

B2.5s

C2.0s

D1.2s

View Explanation & Discuss

Question 29

waec 2014

The diagram above illustrates a uniform metre rule which is balanced on a pivot by some masses. Calculate the value of M

A500.0g

B400.0g

C44.4g

D25.0g

View Explanation & Discuss

Question 30

waec 2014

A car starts from rest and covers a distance of 40m in 10s. Calculate the magnitude of its acceleration

A0.25ms^-2

B0.80ms^-2

C3.20ms^-2

D4.00ms^-2

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