Question # 1

Mathematically, % efficiency is defined as & nbsp

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Efficiency % required form or input/ total input energy x 100

Efficiency % input energy / output energy x 100

Efficiency % work / time x 100

The symbol of sigma is :

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Σ

m

=

$

By dividing displacement of a moving body with time, we obtain

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Deceleration

Acceleration

Speed

Velocity

Which of the following relation is correct?

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F = m/a

F = m-a

F = ma

F = m + a

A body is said to be in __________ equilibrium if after a slight tilt return to its previous position:

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Stable

Unstable

Neutral

None

Cream separater works on:

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Centrifuge principle

Centripetal force

Both

None

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

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

If the direction of motion of the force is perpendicular to the direction of motion of the body then work done will be:

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Maximum

Minimum

Zero

None of these

.............. is example of vector.

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Length

Force

Mass

Time

If an object is moving with constant speed then its distance time graph will be a straight line.

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Along time -axis

Along distance -axis

Inclined to time - axis

Parallel to time-axis

The work done in lifting a brick of mass 2 kg through a height of 5 m above ground will be:

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2.5 J

10 J

50 J

100 J

How many times Mercury is denser than water?

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12.5

13.6

76

76.5

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