The distance between two successive crests of a wave is 15cm and the velocity 300ms-1. Calculate the frequency.
A2.0x102Hz
B4.5x103Hz
C2.0x103Hz
D4.5x102Hz
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Question 402
jamb2014
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 403
jamb2014
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 404
jamb2014
The melting point of a substance is equivalent to its
AVapour Pressure
BSolidification Temperature
CLiquidification Temperature
DSolidification Pressures
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Question 405
jamb2014
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
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Question 406
jamb2014
The equation PaVbTc= 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
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Question 407
jamb2014
What is the equivalent of 20K in Celsius scale?
A-253oC
B-293oC
C68oC
D36oC
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Question 408
jamb2014
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 409
jamb2014
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
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Question 410
jamb2014
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%
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Question 411
jamb2014
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 412
jamb2014
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 413
jamb2014
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 414
jamb2014
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 415
jamb2014
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
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Question 416
jamb2014
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 417
jamb2014
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
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Question 418
jamb2014
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
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Question 419
jamb2014
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
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Question 420
jamb2014
I Electrical potential, II Torque, III Kinetic Energy, IV Momentum. Which of the quantities listed are vectors?
