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2,483 questions

Question 1 of 20 2,483 total questions

Question 271

jamb 2018

If the focal length of a camera is 20cm, the distance from the film at which the lens must be set to produce a sharp image of 100cm away is

A17cm

B20cm

C25cm

D100cm

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Question 272

jamb 2018

Electrical power is transmitted at a high voltage rather than a low voltage because the amount of energy loss is due to

AHeat dissipation

BProduction of eddy currents

CExcessive current discharge

DExcessive voltage discharge

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Question 273

jamb 2018

Which of the following instruments is most suitable for measuring the outside diameter of a narrow pipe in a few millimeters in diameter?

APair of calipers

BMeter rule

CMicrometer screw gauge

DTape rule

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Question 274

jamb 2018

An object weighs 30N in air and 21N in water. The weight of the object when completely immersed in a liquid of relative density 1.4 is

A25.2N

B17.4N

C12.6N

D9.0N

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Question 275

jamb 2018

The efficiency of energy conversion on the energy flow through a hydroelectric power is?

A\(\frac{E1}{E2}\)

B\(\frac{E3}{E2}\)

C\(\frac{E2}{E1}\)+ E2

D\(\frac{E2}{E3}\) + E1

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Question 276

jamb 2018

A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2ms\(^{-1}\). Determine the magnitude of the resulting impulse

A20.0kgms\(^{-1}\)

B10.0kgms\(^{-1}\)

C5.0kgms\(^{-1}\)

D2.5kgms\(^{-1}\)

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Question 277

jamb 2018

Palm oil from a bottle flows out more easily after it has been heated because the

AMolecules do not increase speed during the heating

BViscosity of oil is reduced

COil molecules force each other out

DAdhesion between the oil molecules and those of the bottle is increased

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Question 278

jamb 2018

Which of the following is the dimension of pressure

AML\(^{−1}\)T\(^{−2}\)

BMLT\(^{−2}\)

CML\(^{2}\)T\(^{3}\)

DML\(^{−3}\)

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Question 279

jamb 2018

To keep a vehicle moving at a constant speed V requires power P from the engine. The force provided by the engine is

A\(\frac{P}{v}\)

B(\(\frac{1}{2}\))V

CPV

D\(\frac{P}{V^2}\)

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Question 280

jamb 2018

A particle of mass M initially at rest splits into two. If one of the particles of mass M1 moves with velocity V1 , the second particle moves with velocity

A\(\frac{M1V1}{M-M1}\)

B\(\frac{M1V1}{M1-M}\)

C\(\frac{M1V1}{M}\)

D\(\frac{MV}{M-M1}\)

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Question 281

jamb 2018

The friction which exist between two layers of liquid in relative motion is called.

ACapillary

BSurface

CViscosity

DCohesion

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Question 282

jamb 2018

Which of the following phenomena cannot be explained by the molecular theory of matter?

AConduction

BConvection

CExpansion

DRadiation

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Question 283

jamb 2018

A room is heated by means of a charcoal fire, an occupants of the room standing away from the fire is warmed mainly by

AConvection

BRadiation

CConduction

DReflection

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Question 284

jamb 2018

Which of the following is not a product of nuclear fusion?

AX – ray

BY –ray

Cα – particles

Dneutron

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Question 285

jamb 2018

The process by which protons are converted into helium atoms with a tremendous release of energy is called?

Athermionic emission

Bnuclear fission

Cthermonuclear fusion

Dphotoelectric emission

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Question 286

jamb 2018

Which of the following phenomena is the practical evidence for the existence of the continual motion of molecules.

ATransitional Motion

BRotational Motion

CBrownian Motion

DOscillatory Motion

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Question 287

jamb 2018

Water of mass 150g at 60\(^o\)c is added to 300g of water at 20\(^o\)c and the mixture is well stirred. Calculate the temperature of the mixture.(neglect heat losses to the surroundings)

A33\(^o\)c

B40\(^o\)c

C25\(^o\)c

D10\(^o\)c

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Question 288

jamb 2018

Mercury which is spilled onto a glass surface forms ball-like shapes because____.

AMercury is a metal

BThe cohesive force between its molecules is greater than the adhesive force between mercury and glass molecules

CThe cohesive force between its molecules is less than the adhesive force between mercury and glass molecules

DThe viscosity of mercury is height

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Question 289

jamb 2018

A 40W instrument has a resistance 90 Ohms. On what voltage should it be operated normally

A60V

B150V

C225V

D360V

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Question 290

jamb 2018

Which of the following is an essential physical property of the wires uses for making fuses ?

ALow density

BHypothermal conductivity

CLow electrical resistivity

DLow melting point

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