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Physics

Physics
Least audible sound for most of the human ear is :

0.0002 µ bar
5.0 µ bar
10.0 µ bar
0.005 µ bar

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Physics
The fundamental scientific principle in the operation of battery is

Dissociation of electrolytes
Oxidation-reduction
Acid-base interaction
Dialysis

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Physics
Which of the following devices can be used to detect radiant heat ?

Six's maximum and minimum thermometer
Thermopile
Liquid thermometer
Constant volume air thermometer

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Physics
Land is considered a resource because it

Is used to produce things
Is always available to use
Costs little or nothing to use
Requires labor to be useful

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Physics
A single fixed pulley is used to draw water from a well because

Force is applied in a convenient direction
Efficiency is 100%
Velocity ratio is low
Mechanical advantage is high

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Physics
The rotational effect of a force on a body about an axis of rotation is described in terms of

Moment of force
Centre of gravity
Centrifugal force
Centripetal force

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