Bohr model
Bohr model is a Science & Technology concept from the MPSC syllabus, tested in 2 past MPSC questions (2019, 2020). Below are those real questions with their correct answers and explanations.
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Real questions that test this
रुदरफोर्डच्या प्रयोगाचे कोणते निरीक्षण प्लम पुडिंग प्रकृती वापरून समजणे शास्त्रिय दृष्ट्या अशक्य आहे ? / Which of the following observations of Rutherford's experiment is impossible to understand scientifically with the plum pudding model ?
(a)बहुसंख्य α-कण हे सुवर्णपत्रीतून सरळ आरपार गेले. / Most of the α-particles passed straight through the thin gold foil.
(b)काही α-कणांचे काही कोनातून विचलन झाले. / Some of the α-particles got deflected by some angle.
(c)फारच थोडे α-कण सुवर्णपत्रीवर आढळून परत स्रोताच्या दिशेने उलट फिरले. / A very few α-particles bounced back towards the source.
The plum pudding model assumes mass and positive charge are uniformly distributed. Hence, it cannot explain how heavy alpha particles could bounce back (rebound) by colliding with a dense central nucleus.
थॉम्प्सनच्या अणू प्रतिकृतीवरून खालीलपैकी कोणते गुणधर्म स्पष्टपणे समजतारा ? / Which of the following properties of atom could be explained correctly by Thompson Model of atom ?
Thomson's model of the atom (plum pudding model) could successfully explain the overall electrical neutrality of the atom, showing how positive and negative charges balance each other.