Important Questions of Work, Energy and Power Physics | Zigya

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 Multiple Choice QuestionsMultiple Choice Questions

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231.

A body of mass 3 kg acted upon by a constant force is displaced by S' metre, given by relation S = 13 t2, where t is in second. Work done by the force in 2 is

  • 83 J

  • 195 J

  • 519 J

  • 38 J


232.

Two particles have masses m and 4m and their kinetic energies are in the ratio 2 : 1. What is the ratio of their linear momenta ?

  • 12

  • 12

  • 14

  • 116


233.

The force F acting on a particle moving in a straight line is shown below. What is the work done by the force on the particle in the 1st metre of the trajectory ?

   

  • 5 J

  • 10 J

  • 15 J

  • 2.5 J


234.

If the kinetic energy of a body changes by 20 %, then its momentum would change by

  • 20 %

  • 24 %

  • 9.5 %

  • 44 %


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235.

The work done in carrying a charge Q once around a circle of radius r about a charge q at the centre is

  • qQ4πε0r

  • qQ4πε0 1πr

  • qQ4πε0 12πr

  • Zero


 Multiple Choice QuestionsShort Answer Type

236.

The displacement x of a particle at time t moving under a constant force is t = x + 3, x in metre, t in second. Find the work done by the interval from t = 0 to t= 6 s.


 Multiple Choice QuestionsMultiple Choice Questions

237.

Two blocks of 2 kg and 1 kg are in contact on a frictionless table. If a force of 3 N is applied on 2 kg block, then the force of contact between the two blocks will be

  • zero

  • 1 N

  • 2 N

  • 3 N


238.

If momentum is increased by 20%, then kinetic energy increases by

  • 48 %

  • 44 %

  • 40 %

  • 36 %


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 Multiple Choice QuestionsShort Answer Type

239.

Two identical cylindrical vessels, with their bases at the same level, each contain a liquidof density ρ. The height of liquid in one vessel in h1 and that in the other is h2. The area of either base is A. What is the work done by gravity in equalizing the levels when the vessels are interconnected ?


 Multiple Choice QuestionsMultiple Choice Questions

240.

In an inelastic collision an electron excites a hydrogen atom from its ground state to a M-shell state. A second electron collides instantaneously with the excited hydrogen atom in the M-shell state and ionizes it. At least how much energy the second electron transfers to the atom in the M-shell state ?

  • + 3.4 eV

  • + 1.51 eV

  • − 3.4 eV

  • − 1.51 eV


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