Question # 1

A line about which a body rotates is called;

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Axis of rotation

Rigid Body

Center of gracity

None of these

Sliding friction can be converted into rolling friction by using

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Levers

Wedges

Ball bearings

Pulleys

Tan 𝜽 is equal to:

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Perpendicular/Hypotenuse

Base / Perpendicular

Base/Hyp

Perpendicular/Base

An interval of 200 micro second equivalent to.

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0.2 s

0.02 s

2 x 10^-4 s

2 x 10^-6 s

Newton per meter square is a unit of:

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Pressure

Stress

Both A and B

Force

The quantities that describe completely by magnitude and direction are.

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Scalar

Vector

Base

Derived

The formula of torque is:

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L= F x E

E = F x t

t = F x L

E = F x L

In prefix form, 0.000001 would be expressed as.

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0.1 mm

0.01 mm

0.001 mm

0.0001 mm

In ___________ (CFC) was found reacting with ozone.

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1920s

1970s

1950s

1960s

Fossil fuels are usually:

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Carbon di oxide

Hydrogen

Hydrocarbons

Carbon monoxide

The unit of gravitational constnat is:

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Nm² kg

Nm²kg^-2

Nm²kg^-1

N - m²

Turning effect of a force is called:

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Torque

Moment

Couple

Torque and momentum

The centre of gravity of irregular shaped body can be found with the help of:

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Wedge

Meter rod

Plumb line

Screw gauge

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