JEE Main Physics MCQs - Part 2

Questions 11-20 of 100

11. The work function of a metal is 4.2 eV. If radiation of wavelength 2000 Å falls on it, the maximum kinetic energy of the emitted photoelectrons will be (h = 6.63 * 10⁻³⁴ J·s, c = 3 * 10⁸ m/s):

12. In the Bohr model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state n is:

13. A radioactive sample has a half-life of 10 days. The fraction of the sample that will remain undecayed after 30 days is:

14. In a p-n junction diode, the thickness of the depletion layer is of the order of:

15. A boat moves relative to water with a velocity which is n times the velocity of river flow. At what angle to the stream direction must be boat move to cross the river along the shortest path?

16. A force of 5 N acts on a body of mass 2 kg for 10 s. The change in momentum is:

17. A ball is dropped from a height h on a floor of coefficient of restitution e. The total distance covered by the ball before coming to rest is:

18. A solid sphere rolls down an inclined plane without slipping. The ratio of its rotational kinetic energy to its total kinetic energy is:

19. If the distance between the Earth and the Sun were halved, the duration of the year would be:

20. Two charges +q and -q are separated by a distance d. The electric potential at a point midway between them is:

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