Work Power and Energy Quiz-6
Dear Readers,

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background. 

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced. 

Q1. A ball is released from certain height. It loses 50% of its kinetic energy on striking the ground. It will attain a height again equal to
  •  One fourth of initial height
  •  Half of initial height
  •  three fourth of initial height
  •  None of these
(b) Because 50% loss in kinetic energy will affect its potential energy and due to this ball will attain only half of the initial height

Q2.A rope ladder with a length l carrying a man with a mass m at its end is attached to the basket of balloon with a mass M. The entire system is in equilibrium in the air. As the man climbs up the ladder into the balloon, the balloon descends b y a height h. Then the potential energy of the man
  •  Increase by mg(l-h)
  •  Increase by mgl
  •  Increase by mgh
  •  Increase by mg(2l-h)
(a) Effective height through which man moves up =1-h

Q3.  A particle is projected at 60° to the horizontal with a kinetic energy K. The kinetic energy at the highest point is
  •  K
  •  0
  •  K/4
  •  K/2
(c) Kinetic energy at highest point (KE)H=1/2 mv2 cos⁡2θ =K cos2⁡θ =K(cos⁡60°)2 =K/4

Q4. A 10 kg object collides with stationary 5 kg object and after collision they stick together and move forward with velocity 4 ms-1.what is the velocity with which the 10 kg object hit the second one?
  •  4 ms-1
  •  6ms-1
  •  10ms-1
  •  12ms-1
(b) m1u1+m2u2=(m1+m2)v ∴10×u1+5×0=(10+5)×4 Or u1=(15×4)/10=6ms1

Q5.A force F=Ay2+By+C acts on a body in the y-direction. The work done by this force during a displacement from y=-a to y=a is
  •  (2Aa3)/3
  •  (2Aa3)/3+2Ca
  •  (2Aa3)/3+(Ba2)/2+Ca
  •  None of these


Q6. The kinetic energy possessed by a body of mass m moving with a velocity v is equal to 1/2 mv2, provided
  •  The body moves with velocities comparable to that of light
  •  The body moves with velocities negligible compared to the speed of light
  • The body moves with velocity greater than light
  •  None of the above statements are correct
(b) Due to theory of Relativity

Q7.Which of the following graphs is correct between kinetic energy (E), potential energy (U) and height (h) from the ground of the particle




(a) Potential energy increases and kinetic energy decreases when the height of the particle increases it is clear from the graph (a)

Q8.A 2 kg block slides on a horizontal floor with a speed of 4 m/s. It strikes a uncompressed spring, and compresses it till the block is motionless. The kinetic friction force is 15 N and spring constant is 10,000 N/m. The spring compresses by
  •  5.5 cm
  •  2.5 cm
  •  11cm
  •  8.5 cm
(a) 1/2 mv2-fkx=1/2 kx2 1/2×2×16-15x=1/2×104×x2 ∴x=5.5 cm

Q9.Quantity/Quantities remaining constant in a collision is/are
  •  Momentum, kinetic energy and temperature
  •  Momentum but not kinetic energy and temperature
  •  Kinetic energy and temperature but not momentum
  •  None of the above

Q10. A force F=(2i^+4 j^ ̂)N displaces the body by s=(3j^+5k^ ̂)m in 2 s. Power generated will be
  •  11W
  •  6W
  •  22W
  • 12W
(b) Work done is given by F∙s=(2i^+4j ^ )∙(3j^+5k ̂) =12j Now, power=work/time=12/2=6w

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