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Previous Year Questions on Atoms

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Question 1

Binding energy per nucleon vs mass number curve for nuclei is shown in the figure. W, X, Y and Z are four nuclei as indicated on the curve. The process that would release energy is–

Question 2

Assuming that about 200 MeV of energy is released per fission of ₉₂U²³⁵ nuclei, then the mass of U²³⁵ consumed per day in a fission reactor of power 1 megawatt will approximately be,

Question 3

Heavy water is used as moderator in a nuclear reactor. The function of the moderator is -

Question 4

Mean atomic weight of atoms of singly ionized lithium (Li) is 6.06 amu. If its energy is 400 eV and it moves in a magnetic field of 0.8 tesla, then the radius of circular path is

Question 5

The half-value period of a radioactive element is 20 seconds. At any instant the number of radioactive nuclei is one million. Ten seconds later, the number of radioactive nuclei left are -

Question 6

The half life of ²¹⁵ At is 100 µs. The time taken for the radio activity of a sample of ²¹⁵At to decay to

th of its initial value is –

Question 7

Two protons are kept at a separation of 10 nm. Let F_n and F_e be the nuclear force and the electromagnetic force between them -

Question 8

Let F_pp, F_pn and F_nn denote the magnitude of the net force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively. Neglect gravitational force. When the separation is 1 fm, -

Question 9

A high energy gamma ray while passing through the strong electric field of the nucleus sometimes gives rise to a particle and antiparticle. This phenomenon is called

Question 10

The range of nuclear forces is about -

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Dec 31JEE & BITSAT