Question # 1

Work is negative when angle between F and d is

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45^o

₀^o

90^o

180^o

Which one is renewable source of energy.

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Coal

Uranium

Biomass

Natural gas

A body of mass 2 kg moving with velocity of 4 ms-1 has K.E. equal to.

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16 J

8 J

32 J

2 J

The dimensions of work are

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MLT^-1

MLT^-2

ML²T^-2

ML^-1T^-1

The formula for the power is

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P= W/d

P=W/v

P=W/t

P=Wt

The dimensions of work are.

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[MLT-1]

[MLT-2]

[ML2T-2]

[MLT]

Kilo watt hour is the unit of

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Power

Energy

Force

Torque

1 KWh =

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3.6 x 10³K

3.6 x 10⁶K

3.6 x 10⁹J

3.6 x 10¹²J

The SI unit of work is

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Newton

Joule

Mol

Calorie

SI unit of work

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Newton

Walt

Pascal

Joule

The power needed to lift a mass of 5000 g to height of 1 m in 2 secnd is

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2.45 watt

24.5 watt

245 watt

2.45 watt

The work done in gravitational field

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Depend upon the path

Does not depend upon the path

(+)ve

Zero

The frictional force is

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Conservative force

Non conservative force

Electric force

Magnetic force

The space within which gravitational force acts on a body is called

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Electric field

Gravitational field

Magnetic field

Force field

By increasing the amount of stretch in spring the force exerted will

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Increase

One watt

One erg

One joule

Which one is non renewable source of energy.

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Hydro electric

Bio mass

Tides

Oil

The unit of energy is same as that of

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Power

Work

Torque

Density

When the rocket moves away from the earth, the work against gravity

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Remains constant

Varies directly with distance

Varies inversely with distance

Varies inversely with square of distance

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