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41 questions

Question 1 of 20 41 total questions

Question 11

jamb 2014

Heat transfer by convection in a liquid is due to the

ALatent heat of vaporization of the liquid

BIncreased vibration of the molecules of the liquid about theit mean position

CVariation of density of the liquid

DExpansion of the liquid as it is heated

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Question 12

jamb 2014

The temperature at which the water vapour present in the air is just sufficient to saturate air is

ABoiling point

BIce point

CSaturation point

DDew point

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Question 13

jamb 2014

The melting point of a substance is equivalent to its

AVapour Pressure

BSolidification Temperature

CLiquidification Temperature

DSolidification Pressures

View Explanation & Discuss

Question 14

jamb 2014

The quantity of heat needed to raise the temperature of a body by 1K is the body's

AHeat capacity

BInternal energy

CSpecific heat capacity

DLatent heat of fusion

View Explanation & Discuss

Question 15

jamb 2014

The equation P^aV^bT^c= constant reduces to Charles Law if

Aa=1, b=1and c=0

Ba=1, b=0 and c=-1

Ca=0, b=1 and c=1

Da=0, b=1 and c=-1

View Explanation & Discuss

Question 16

jamb 2014

What is the equivalent of 20K in Celsius scale?

A-253^oC

B-293^oC

C68^oC

D36^oC

View Explanation & Discuss

Question 17

jamb 2014

The small droplets of water that form on the grass in the early hours of the morning is

AFog

BHaul

CMist

DDew

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Question 18

jamb 2014

A force of 500N¹ is applied to a steel wire of cross-sectional area 0.2m², The tensile stress is

A2.5x10⁴Nm^-2

B1.0x10²Nm^-2

C1.0x10³Nm^-2

D2.5x10³Nm^-2

View Explanation & Discuss

Question 19

jamb 2014

A wheel and an axle is used to raise a load whose weight is 800N when an effort of 250N is applied. If the radii of the wheel and axle are 800mm and 200mm respectively, the efficiency of the machine is

A90%

B80%

C85%

D87%

View Explanation & Discuss

Question 20

jamb 2014

A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.

A343.32N

B233.33N

C333.33N

D334.33N

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Question 21

jamb 2014

The energy in the nucleus of atoms produce heat which can be used to generate

AKinetic energy

BMechanical energy

CElectrical energy

DPotential energy

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Question 22

jamb 2014

An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of the object just before it hits the ground is

A200J

B4000J

C2000J

D500J

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Question 23

jamb 2014

What happens when three coplanar non-parallel forces are in equilibrium?

ATheir lines of action are parallel.

BThey are represented in magnitude only

CThey are represented in direction only

DTheir lines of action meet at a point

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Question 24

jamb 2014

One of the conditions necessary for an object to be in equilibrium when acted upon by a number of parallel forces is that the vector sum of the forces is

AAverage

BZero

CNegative

DPositive

View Explanation & Discuss

Question 25

jamb 2014

An object of weight 8kg on earth is taken to a planet where acceleration due to gravity is one-third of its value on earth. The weight of the object on the planet is

A48N

B12N

C27N

D36N

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Question 26

jamb 2014

Calculate the escape velocity of a satellite launched from the earth's surface if the radius of the earth is 6.4x10⁶m

A25.3kms^-1

B4.2kms^-1

C4.0kms^-1

D11.3kms^-1

View Explanation & Discuss

Question 27

jamb 2014

A car accelerates uniformly from rest at 3ms^-2. its velocity after traveling a distance of 24m is

A12ms^-1

B144ms^-1

C72ms^-1

D36ms^-1

View Explanation & Discuss

Question 28

jamb 2014

Which type of motion do the wheels of a moving car undergo?

AVibratory and translational motion

BRandom and translational motion

CRotational mand oscillatory motion

DTranslational and rotational motion

View Explanation & Discuss

Question 29

jamb 2014

I Electrical potential, II Torque, III Kinetic Energy, IV Momentum. Which of the quantities listed are vectors?

AII and IV

BI and II

CI and III

DII and III

View Explanation & Discuss

Question 30

jamb 2014

A quantity which requires magnitude and direction to be specified is

ATemperature

BDistance

CDisplacement

DMass

View Explanation & Discuss

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