Free & Premium Study Material · Online Courses · Instant Download+91 99398 78821 · support@downloadstore.in
downloadstoreSTUDY MATERIAL
LoginRegister🛒0

Atomic Structure

99 MCQ questions with answers and explanations · page 2 of 4

Test yourself▶ 25 question test▶ 50 question test

Q26. In which of the following particles is the double nature of narrow-wave found?

  1. AMason
  2. BProton
  3. Celectron
  4. DNeutron
Show answer & explanation

Answer: C) electron

Q27. The total energy of an electron revolving in an atom is-

  1. Acannot be negative
  2. Bcan have any value greater than zero
  3. Ccan never be positive
  4. DIt is always positive.
Show answer & explanation

Answer: D) It is always positive.

Q28. Who discovered the 'proton'?

  1. AGoldstein
  2. BChadwick
  3. CThomson
  4. DFaraday
Show answer & explanation

Answer: A) Goldstein

Q29. The charge on the proton is equal to the charge on the ________.

  1. Aelectron
  2. Balpha particles
  3. CNeutron
  4. DPositron
Show answer & explanation

Answer: B) alpha particles

Q30. What is the number of protons in a negatively charged atom (anion)?

  1. Agreater than the atomic number of the element
  2. Bless than the atomic number of the element
  3. Cmore than the number of electrons in the atom
  4. Dless than the number of electrons in the atom
Show answer & explanation

Answer: D) less than the number of electrons in the atom

Q31. Who discovered 'neutron'?

  1. AJames Chadwick
  2. BErnest Rutherford
  3. CJ.J. Thomson
  4. DJohn Dalton
Show answer & explanation

Answer: A) James Chadwick

Q32. Which of the following statements regarding the properties of neutrons is not correct?

  1. AThe mass of a neutron is approximately equal to the mass of a proton.
  2. BThe charge of a neutron is zero
  3. CNeutron is located inside the atomic nucleus
  4. DNeutrons revolve around the atomic nucleus
Show answer & explanation

Answer: D) Neutrons revolve around the atomic nucleus

Q33. Which of the following atoms does not have a neutron in its nucleus?

  1. ALithium
  2. Bhydrogen
  3. Ctritium
  4. Dhelium
Show answer & explanation

Answer: B) hydrogen

Q34. The discoverer of 'positron' is

  1. AChadwick
  2. BYukawa
  3. CAnderson
  4. DRutherford
Show answer & explanation

Answer: C) Anderson

Q35. 'Positron' is the antiparticle of what?

  1. Aelectron
  2. BProton
  3. CNeutron
  4. DMason
Show answer & explanation

Answer: A) electron

Q36. An Indian scientist whose name is associated with a specific fundamental particle is-

  1. ARaman
  2. Bboss
  3. CChandrashekhar
  4. DSaha
Show answer & explanation

Answer: B) boss

Q37. Which nuclear particle has no mass and no charge, but has spin?

  1. Aelectron
  2. BProton
  3. CNeutrinos
  4. DMason
Show answer & explanation

Answer: C) Neutrinos

Q38. The particle that binds the nucleon is-

  1. Aelectron
  2. BPositron
  3. CNeutron
  4. DMason
Show answer & explanation

Answer: D) Mason

Q39. The discoverer of 'neutrino' is-

  1. AAnderson
  2. BPaulie
  3. CYukawa
  4. DGoldstein
Show answer & explanation

Answer: B) Paulie

Q40. The discoverer of 'meson' is-

  1. APaulie
  2. BChadwick
  3. CYukawa
  4. DThomson
Show answer & explanation

Answer: C) Yukawa

Q41. Which one of the following is not a part of an atom?

  1. Aelectron
  2. BProton
  3. CNeutron
  4. Dphoton
Show answer & explanation

Answer: D) photon

Q42. The atomic mass of an element is equal to the sum of the numbers of which of the following?

  1. Aonly the number of electrons and protons
  2. Bonly the number of protons and neutrons
  3. Conly the number of electrons and neutrons
  4. DThe number of electrons, protons, and neutrons
Show answer & explanation

Answer: B) only the number of protons and neutrons

Q43. The mass number of the nucleus is

  1. Ais always less than its atomic number
  2. Bis always greater than its atomic number
  3. Cis always equal to its atomic number
  4. DSometimes it is greater than its atomic number and sometimes it is equal to it.
Show answer & explanation

Answer: B) is always greater than its atomic number

Q44. The difference between the atomic mass and mass number of an atom is called-

  1. Aatomic number
  2. Batomic number
  3. CMass damage
  4. Dnumber of electrons
Show answer & explanation

Answer: C) Mass damage

Q45. Which of the following is the most fundamental characteristic of an element?

  1. Amelting point
  2. Batomic number
  3. CColour
  4. Datomic mass
Show answer & explanation

Answer: B) atomic number

Q46. The international standard of atomic weight is-

  1. AO-16
  2. BN-14
  3. CC-12
  4. DH-1
Show answer & explanation

Answer: C) C-12

Q47. The chemical properties of an element depend on-

  1. Aon atomic mass
  2. Bon atomic number
  3. Con the mass number
  4. Don atomic weight
Show answer & explanation

Answer: B) on atomic number

Q48. The four quantum numbers of two electrons in an atom cannot be the same. This law is associated with which of the following scientists?

  1. AHund
  2. BPaulie
  3. CFaraday
  4. DArrhenius
Show answer & explanation

Answer: B) Paulie

Q49. The magnetic quantum number in the context of the molecule of a chemical element is related to-

  1. ABy orientation
  2. Bby frequency
  3. Cby size
  4. Dby rotation
Show answer & explanation

Answer: A) By orientation

Q50. The quantum number that specifies the direction of orientation in space of an orbit is-

  1. Aprincipal quantum number
  2. Borbital quantum number
  3. Cmagnetic quantum number
  4. Dspin quantum number
Show answer & explanation

Answer: C) magnetic quantum number

1234
← Acids, Bases, and SaltsChemical Bonding →
💬