41. In one of the predetermined pathways known as, electrons are rotating around the nucleus.
(a) Shells
(b) Orbit
(c) Both of these
(d) None of these
answer
(c) Both of these
42. The same element’s atoms have various mass numbers but the same atomic number?
(a) Isotopes
(b) Isotopes of chlorine
(c) Isotopes of carbon
(d) Orbit
answer
(a) Isotopes
43. Isotopes are used in?
(a) Chemical
(b) Agriculture research
(c) Medical
(d) all of these
answer
(d) all of these
44. The maximum number, of electrons in 3rd energy, level is?
(a) 10
(b) 18
(c) 32
(d) 64
answer
(b) 18
45. Mass of an atom, is mostly due to, it’s?
(a) Nucleus
(b) Neutrons
(c) Electrons
(d) Protons
answer
(a) Nucleus
46. In Rutherford’s scattering experiment, neutrons would have been used in place of alpha particles, wouldn’t they?
(a) Not deflect because they have no charge
(b) Have deflected more often
(c) Have been attracted to the nucleus easily
(d) Have given the same results
answer
(a) Not deflect because they have no charge
47. Electron in its ground state does not?
(a) Spin
(b) Radiate energy
(c) Revolve
(d) Reside in orbit
answer
(b) Radiate energy
48. The neutron particle?
(a) Has a mass equal to that of a electron
(b) Has a mass approximately equal to that of a proton
(c) Has charge equal to but opposite to that of an electron
(d) Has a positive charge
answer
(b) Has a mass approximately equal to that of a proton
49. Isotopes of the, same element have?
(a) The same number of protons
(b) The same number of neutrons
(c) Different number of electrons
(d) The same masS number
answer
(a) The same number of protons
50. Which one is the lightest?
(a) An alpha particle
(b) An electron
(c) A hydrogen atom
(d) A proton
answer
(b) An electron
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