NEET Class 12

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 Multiple Choice QuestionsMultiple Choice Questions


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


Given A = 2 i^ + 3 j^ and B = i^ + j^. The component of vector A along vector B is

  • 12

  • 32

  • 52

  • 72


A cubical vessel of height 1 m is full of water. What is the amount of work done in pumping water out of the vessel ? (Take g = 10 m/s2)

  • 1250 J

  • 5000 J

  • 1000 J

  • 2500 J


If a person can throw a stone to maximum height of h metre vertically, then the maximum distance through which it can be thrown horizontally by the same person is

  • h2

  • h

  • 2h

  • 3h


A body of mass 6 kg is acted upon by a force which causes a displacement in it given by x = t24 metre, where t is the time in second. The work done by the force in 2 s is

  • 12 J

  • 9 J

  • 6 J

  • 3 J


A box is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to

  • t1/2

  • t3/4

  • t3/2

  • t2


A particle is moving with a constant speed v in a circle. What is the magnitude of average velocity after half  rotation ?

  • 2v

  • 2vπ

  • v2

  • v2π


A cricket ball of mass 0.25 kg with speed 10 m/s collides with a bat and returns with same speed within 0.01 s. The force acted on bat is

  • 25 N

  • 50 N

  • 250 N

  • 500 N


If the earth were to suddenly contract to 1nth of its present radius without any change in its mass, the duration of the new day will be nearly

  • 24/n h

  • 24 n h

  • 24/n2 h

  • 24 n2 h


If g is the acceleration due to gravity on the surface of the earth, the gain in potential energy of an object of mass m raised from the earth's surface to a height equal to the radius R of the earth is

  • mgR4

  • mgR2

  • mgR

  • 2mgR