Question # 1

The unit of energy is same as that of

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Power

Work

Torque

Density

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

If a body of mass 5 kg is raised vertically through a distance of 1 m, then work done is.

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49 J

4.9 J

490 J

0.49 J

The unit of work in base unit is

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Kg m-1 sec-2

Kgm sec-2

Kgm2 sec-1

Kgm-1 sec-1

The K.E. of bullet of mass 500 gm moving at a speed of 200 ms-1

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250 J

125 J

2500 J

10,000 J

SI unit of work

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Newton

Walt

Pascal

Joule

The value of solar constant.

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1.4 kW m-2

1.0 kW m-2

1.6 kW m-2

2 kw m-2

Two quantities involved in work are

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Force and speed

Force and velocity

Force and displacement

Force and acceleration

A body has P.E. = mgh, when it is at height 'h' from the ground. At the point at the distance 'x' below from the top its P.E. with

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mgh

mgx

mg(x-h)

None of these

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 SI unit of power is

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Joule

Newton

Watt

Kilowatt

Work is negative when angle between F and d is

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45^o

₀^o

90^o

180^o

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

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Electric field

Gravitational field

Magnetic field

Force field

The work done in gravitational field

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Depend upon the path

Does not depend upon the path

(+)ve

Zero

Work has dimension lime

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Torque

Momentum

Velocity

Power

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