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49 questions

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Question 21

jamb 2017

A cell of internal resistance 2Ω supplies current to a 6Ω resistor. The efficiency of the cell is

A12.0%

B25.0%

C33.3%

D75.0%

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Question 22

jamb 2017

Calculate the specific latent heat of vaporization of steam of 1.13 x 10\(^6\)J of heat energy is required to convert 15kg of steam to water.

A7.53 x 105 Jkg\(^{-1}\)

B7.53 x 10-2Jkg\(^{-1}\)

C\(7.53 \times 10^{4}\)Jkg\(^{-1}\)

D7.53 x 10-3Jkg\(^{-1}\)

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Question 23

jamb 2017

Under which of the following conditions is workdone

AA man supports a heavy food above his head with his hands

BA boy climbs onto a table

CA man pushes unto a table

DA woman holds a pot of water

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Question 24

jamb 2017

Under what conditions are cathode rays produced in a discharge tube?

AHigh pressure and low voltage

BHigh pressure and high voltage

CLow pressure and low voltage

DLow pressure and high volatge

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Question 25

jamb 2017

Calculate the upthrust on an object of volume 50cm3 which is immersed in liquid of density \(10^{3}\) kgm-3 [g = 10ms-2]

A0.8N

B2.5N

C0.5N

D1.0N

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Question 26

jamb 2017

Why do soldiers march disorderly while crossing a bridge?

ATo prevent resonance on the bridge

BTo set the bridge into resonance

CTo make the b ridge collapse

DTo spread their weight evenly on the bridge

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Question 27

jamb 2017

Calculate the electric field intensity between two plates of potential difference 6.5V when separated by a distance of 35cm.

A18.57NC\(^{-1}\)

B53.06N C\(^{-1}\)

C2.28NC\(^{-1}\)

D0.80NC\(^{-1}\)

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Question 28

jamb 2017

Which of the following is not an electromagnetic radiation?

Ax - ray

BRadio waves

Csunlight

Dsound waves

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Question 29

jamb 2017

Which is the incorrect formula for a body accelerating uniformly?

Aa = v² − \(\frac{u^2}{2}\)

Bv² = u² + 2as

Cs = ut + \(\frac{1}{2}\) at²

Dv² − u²= 2as

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