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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 1111

jamb 1983

Which of the following statements is CORRECT? i. the mass number is equal to the total number of protons and electrons in an atom. ii. the atomic number is equal to the number of protons in an atom. iii. the number of electrons in an atom is equal to the total number of protons and neutrons in the nucleus.

Ai only

Bii only

Ciii only

Di and ii only

Eii and iii only

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Question 1112

jamb 1983

The total length of a spring when a mass of 20g is hung from its end is 14cm, while its total length is 16cm when a mass of 30g is hung from the same end. Calculate the unstretched length of the spring assuming Hooke's law is obeyed.

A9.33cm

B10.00cm

C10.66cm

D12.00cm

E15.00cm

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Question 1113

jamb 1983

1,000 identical drops of oil of density 500kgm-3 have a total mass of 5 x 10-4kg. One of the drops forms a thin film of area 0.5m2 on water. The thickness of the film is

A2 x 10^-8m

B2 x 10^-9m

C2 x 10^-7m

D3 x 10^-9m

E2.8 x 10^-8m

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Question 1114

jamb 1983

a force of 16N applied 4.0kg block that is at rest on a smooth, horizontal surface. What is the velocity of the block at t = 5 seconds?

A4ms^-1

B10ms^-1

C20ms^-1

D50ms^-1

E80ms^-1

View Explanation & Discuss

Question 1115

jamb 1983

Of the following derived units, the one that is not a unit of power is

Ajoule/second

Bampere volt

Campere²volt

Dvolts²/ohm

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Question 1116

jamb 1983

A piece of wood is floating on water. The forces acting on the wood are

Aupthrust and reaction

Bweight and reaction

Cweight and upthrust

Dupthrust and viscousity

Eweight and viscousity

View Explanation & Discuss

Question 1117

jamb 1983

Ripples on water are similar to light waves in that they both

Ahave the same wavelength

Bare longitudinal

Ccannot be reflected

Dtravel at the same speed

Ecan be refracted and diffracted

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Question 1118

jamb 1983

The electrochemical equivalent of a metal is 0.126 x 10^-6 kgC^-1. The mass of the metal that a current of 5A will deposit from a suitable bath in 1 hour is

A0.0378 x 10 ^-3kg

B0.227 x 10 ^-3kg

C0.378 x 10 ^-3kg

D0.595 x 10 ^-3kg

E2.268 x 10 ^-3kg

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Question 1119

jamb 1983

A 24V potential difference is applied across a parallel combination of four 6-ohms resistor, The current in each resistor is

A1A

B4A

C16A

D18A

E36A

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Question 1120

jamb 1983

The linear expansivity of brass is 2 x 10^-5 ^oC^-1. If the volume of a piece of brass is 10cm³ at 0^oC, what will be its volume at 100^oC?

A10.02cm³

B10.04cm³

C10.06cm³

D10.20cm³

E102.00cm³

View Explanation & Discuss

Question 1121

jamb 1983

A milliameter with full scale deflection of 10mA has an internal resistance of 5 ohms. It would be converted to an ammeter with a full scale deflection of 1A by connecting a resistance of

A\(\frac{5}{99}\)ohms in series with it

B\(\frac{5}{99}\)ohms in parallel with it

C\(\frac{99}{5}\)ohms in series with it

D\(\frac{99}{5}\)ohms in parallel with it

E2 ohms in series with it

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Question 1122

jamb 1983

Which of the following arrangements in the sequence shown can be used to obtain a pure spectrum of white light?

Asource, slit, converging lens, prism, converging lens, screen.

Bsource, slit, diverging lens, prism, diverging lens, screen.

Csource, converging lens, prism, diverging lens, screen.

Dsource, slit, prism, diverging lens, converging lens, screen.

Esource, slit, prism, diverging lens, sreen.

View Explanation & Discuss

Question 1123

jamb 1983

A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If acceleration due to gravity is 10ms-2, the power expended is?

A100W

B200W

C250W

D400W

E500W

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Question 1124

jamb 1983

Which of the following conditions are necessary and sufficient for total internal reflection to take place at the boundary between two optical media? i. light is passing from optically denser medium to optically less dense medium. ii. light is passing from optically less dense medium to optically denser medium. iii. angle of incidence is greater. iv. angle of incidence is lesser

Ai and ii only

Bii and iii only

Cii and iv only

Di and iii only

Eii and iv only

View Explanation & Discuss

Question 1125

jamb 1983

A train has an initial velocity of 44ms^-1 and an acceleration of -4ms^-1. Its velocity after 10 seconds is

A2ms^-1

B4ms^-1

C8ms^-1

D12ms^-1

E16ms^-1

View Explanation & Discuss

Question 1126

jamb 1983

If the pressure on 100cm3 of an ideal gas is doubled while its kelvin temperature is halved, then the new volume of the gas will become

A25cm³

B50cm³

C100cm³

D200cm³

E400cm³

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Question 1127

jamb 1983

The range of wavelengths of the visible spectrum is 400nm - 700nm. The wavelength of gamma rays is

Alonger than 700nm

Bshorter than 700nm but longer then 400nm

C550nm

Dshorter than 400nm

Einfinite

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Question 1128

jamb 1983

Which of the following statements about defects of vision is/are CORRECT? i. for a long sighted person, close objects appear blurred. ii. for a short sighted person, distant objects appear blurred. iii. short sight is corrected by using a pair of converging lenses.

Ai only

Bii only

Ci and ii only

Dii and iii only

Ei, ii and iii

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Question 1129

jamb 1983

which of the following is NOT correct? i. the pitch of a sound note depends on the frequency of vibrations. ii. the intensity of a sound note is proportional to the amplitude of vibrations. iii. beats are produced by two sources of sound because one wave is travelling faster than the other. iv. when two sources of sound of frequencies 500Hz and 502Hz are sounded together, a beat frequency of 2Hz is observed. v. the first harmonic of a tone have double the frequency of the fundamental note.

Ai and ii

Bii and iii

Ci and iii

Diii and iv

Eiv and v

View Explanation & Discuss

Question 1130

jamb 1983

A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms ^-1, how much closer is the ship to the cliff?

A10m

B125m

C175m

D350m

E1,000m

View Explanation & Discuss

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