Physics GK · all questions

Work, Energy and Power
practice.

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406

Questions

20/21

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Q381

A 40 kg girl quickly climbs up the stairs to 5m height in 4 sec, what will be the power developed by her?

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Q382

Which physical quantity is represented by the ratio of momentum and velocity of the body?

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Q383

Which of the following does not affect the value of acceleration due to gravity?

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Q384

A bullet of mass 12 g is fired from a rifle. The bullet takes 0.006 second to move through its barrel and leaves it with a velocity of 300 m/s. What is the force exerted on the bullet by the rifle?

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Q385

When an object of 12kg is at a height of 5m from the ground, then the energy contained in it will be? (g = 9.8ms^-2)

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Q386

The product of mass and velocity is called:

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Q387

An object of 20kg mass is moving at speed of 10m/s. What is the kinetic energy obtained by the object?

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Q388

In wind power, which form of energy is converted into electrical energy?

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Q389

Which one among the following happens when a swing rises to a certain height from its rest positions?

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Q390

A 4.0 kg object is moving horizontally with a speed of 5.0 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:

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Q391

An example of pulling is-

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Q392

If a person pulls the trolley up to the distance of 10 m with the force of 50 N, what will be the work done by him?

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Q393

In which of the following situations is the work done by negative force?

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Q394

An object has a potential energy of 400J with a mass of 20kg and a gravity of 10 m/s², what is the height of that object?

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Q395

Potential energy is equal to-

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Q396

Energy conservation means

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Q397

An object of mass 50 kg is moving at a fixed velocity of 6 ms^-1. Calculate the momentum of the object.

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Q398

If a stationary force applied to an object, the object moved in the direction of force, is expressed as a result of force and displacement, it is called_

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Q399

Which of the following can not be created nor be destroyed?

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Q400

What is the mass of a unit volume of substance called?

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