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99 questions

Question 1 of 19 99 total questions

Question 41

jamb 2017

Which of the following operations can be used to convert an alternative current dynamo into a direct current dynamo

Anumber of turns in the coil is increased

Bstrength of the field magnet is increased

Cslip rings are replaced with split ring commutator

Dcoil is wound on a soft iron armature

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Question 42

jamb 2017

When the r.m.s value of a source of electricity supply is given as 240v, it means that the peak value of the supply is

A240v

B340v

C480v

D57600v

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Question 43

jamb 2017

When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The mass of P is half that of Q. The ratio of the specific heat capacity pf P to Q is

A1:4

B4:1

C1:1

D2:1

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Question 44

jamb 2017

Calculate the height of the image formed by a pinhole camera of length 12cm used to photograph an object 60cm away from the hole and 70cm high

A10 cm

B16 cm

C5 cm

D14 cm

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Question 45

jamb 2017

The S.I unit of moment of a force is

Akgm

BNm

CJm

Dµm\(^{-1}\)

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Question 46

jamb 2017

An element and its isotope only differ in the number of

Aprotons

Belectrons

Cions

Dneutrons

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Question 47

jamb 2017

Which of the following instruments helps to maintain the correct humidity and temperature of a building?

AA compressor

BA refrigerator

CAir blower

DAir conditioner

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Question 48

jamb 2017

Three 3ω resistance are connected in parallel what is the equivalent resistance?

A1ω

B9ω

C3ω

D0.33ω

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Question 49

jamb 2017

A block and tackle pulley arrangement has 6 pulleys in which an effort of 50N supports a load of 200N, calculate the efficiency of the machine

A80.0%

B76.6%

C66.7%

D60.7%

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Question 50

jamb 2017

Which of the following statements is NOT correct?

AMolecules of a liquid are stationary

BBrownian motion is an evidence of particle nature of matter

CMatter is made up of molecules

DThe molecules of matter are in constant motion

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Question 51

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 52

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 53

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 54

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 55

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 56

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 57

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 58

jamb 2017

Which of the following is not an electromagnetic radiation?

Ax - ray

BRadio waves

Csunlight

Dsound waves

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Question 59

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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