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NEET UG BIOLOGY Multiple Choice Questions (MCQs)

NEET UG - BIOLOGY MCQs - Atoms and Nuclei

NEET UG - BIOLOGY MCQs (Atoms and Nuclei)

256. The Rutherford scattering experiment led to the discovery of:

a) Proton

b) Neutron

c) Nucleus

d) Electron

Answer: c) Nucleus

257. In Rutherford's model of the atom, most of the mass is concentrated in:

a) Electrons

b) Nucleus

c) Proton

d) Neutron

Answer: b) Nucleus

258. According to Bohr’s model of the atom, the angular momentum of an electron is quantized and given by:

a) nħ

b) nħ/2π

c) n²ħ

d) n²ħ/2π

Answer: d) n²ħ/2π

259. The energy levels in the Bohr model for the hydrogen atom are given by:

a) En = -13.6/n² eV

b) En = -13.6/n eV

c) En = -13.6n² eV

d) En = -13.6n eV

Answer: a) En = -13.6/n² eV

260. Which of the following is true for the hydrogen spectrum in Bohr’s model?

a) The lines of the hydrogen spectrum are continuous.

b) The spectrum consists of discrete lines corresponding to different transitions.

c) The spectrum is a single line.

d) The spectrum has no lines.

Answer: b) The spectrum consists of discrete lines corresponding to different transitions.

261. The composition of a nucleus is determined by its:

a) Atomic number and mass number

b) Atomic number and neutron number

c) Neutron number and mass number

d) Atomic number and electron number

Answer: a) Atomic number and mass number

262. The mass defect of a nucleus is defined as the difference between:

a) The total mass of the nucleus and the sum of the masses of the individual nucleons

b) The total mass of the nucleus and the mass of the proton

c) The mass of the atom and the mass of the electron

d) The mass of the atom and the mass of the proton

Answer: a) The total mass of the nucleus and the sum of the masses of the individual nucleons

263. The binding energy per nucleon is a measure of:

a) The energy required to separate a nucleus into its constituent protons and neutrons

b) The energy required to remove an electron from an atom

c) The energy released during nuclear fusion

d) The energy required to excite a nucleus

Answer: a) The energy required to separate a nucleus into its constituent protons and neutrons

264. Which of the following is true for the variation of binding energy per nucleon with mass number?

a) It increases steadily with mass number.

b) It decreases with mass number for heavier nuclei.

c) It is constant for all nuclei.

d) It increases with mass number for light nuclei.

Answer: b) It decreases with mass number for heavier nuclei.

265. In nuclear fission, the mass of the products is:

a) Greater than the mass of the reactants

b) Equal to the mass of the reactants

c) Less than the mass of the reactants

d) Unchanged

Answer: c) Less than the mass of the reactants

266. The process in which two light nuclei combine to form a heavier nucleus is called:

a) Nuclear fission

b) Nuclear fusion

c) Radioactive decay

d) Electron capture

Answer: b) Nuclear fusion

267. In Bohr’s model of the atom, the electron revolves around the nucleus in a:

a) Continuous orbit

b) Fixed orbit

c) Random orbit

d) Circular orbit

Answer: b) Fixed orbit

268. The radius of the nucleus is proportional to:

a) A¹/³

b) A²/³

c) A¹/2

d) A

Answer: a) A¹/³

269. The concept of matter waves was introduced by:

a) Bohr

b) Planck

c) de Broglie

d) Rutherford

Answer: c) de Broglie

270. The binding energy per nucleon is maximum for which of the following elements?

a) Hydrogen

b) Iron

c) Uranium

d) Carbon

Answer: b) Iron

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NEET UG BIOLOGY Multiple Choice Questions (MCQs)

NEET UG - BIOLOGY MCQs (Atoms and Nuclei)

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