JAC 12th Physics Important Questions Unit 8 : Atoms and Nuclei

JAC 12th Physics Important Questions [Unit 8.] Exam: झारखण्ड बोर्ड कक्षा 12th सभी विद्यार्थियों के लिए Physics Chapter 12 & 13. Atoms and Nuclei पिछले वर्षो में जो भी प्रश्न पूछे गए हैं, उनकी चर्चा हम इसमें करेंगे इनमें हम Subjective Questions तथा Objective Questions को देखेंगे तो इन Important Questions को पढ़ लीजिए.

रांची: झारखंड एकेडमिक काउंसिल ( JAC Board) कक्षा JAC 12th Physics Important Question के पिछले वर्षों के सभी महत्वपूर्ण प्रश्न (important Questions) आपको यहाँ पर बताए जा रहे है, जो बोर्ड परीक्षा के लिए बहुत महत्वपूर्ण है. अगर आप इन सभी प्रश्नों को याद कर लेते हो तो अवश्य ही आप JAC Board class 12th Physics exam में अच्छे अंक प्राप्त कर सकते हो.यदि आप ऐसे ही सभी विषयों के Chapterwise Questions उत्तर चाहते हैं तो हमारे वेबसाइट www.jharkhandlab.com से जुड़े रहे.

विद्यार्थी इसका उत्तर स्वयं करें। ये सारे प्रश्न आपके परीक्षा (JAC 12th Physics Important Question For Board Exams)में बार – बार पूछे जा रहे है। इसमें आपको सभी chapter का अलग-अलग पिछले 16 से 17 वर्षों के महत्वपूर्ण प्रश्न मिलेंगे। यानि 2006-2022 इसमें आपको ये भी बताया जा रहा है कि कौन से प्रश्न किस तरह से एवं कितने marks के पूछे जा रहें है।

यदि वैसे छात्र छात्राएं जो प्रश्नों के उत्तर नहीं कर पाते हैं, वो कुछ दिन प्रतीक्षा करें. आप यहाँ से Questions-answers डाउनलोड कर सकते हैं.

Learn More :

• JAC 12th English Core Important Questions Chapter 1. My mother at sixty-six
• JAC 12th English Core Important Questions Chapter 2. An Elementary School Classroom in a Slum
• JAC 12th English Core Important Questions Chapter 3. Keeping Quiet
• JAC 12th Physics Important Questions Ch.1. Electric Charges and fields
• JAC 12th Physics Important Questions Ch.2. Electric Potential and Capacitance
• JAC 12th Physics Important Questions Ch.3. Electric Current
• JAC 12th Chemistrty Important Questions Ch.1. Solid State
• JAC 12th Chemistry Important Questions Ch.2. Solutions

JAC 12th Physics Previous Years Important Questions :

Q1. What is Ratherford Soddy law for radioactive decay? The decay constant of radium is 1.36×10^-11 per second. What is its half life? (2006, 2008, 2009, 2017)

Q2. Distinguish between nuclear fission and fusion? (2006)

Q3. The radius of first electron orbit of a hydrogen atom is 5.3×10^-11 m. What are the radii of the second and the third orbits? (2007)
Q4. What are the functions of moderators and control rods in a nuclear reactor? (2007)
Q5. What is nuclear fission and fusion? (2008)

Q6. Explain the term ‘binding energy per nucleon’. (2009)
Q7. How many kilograms are in one atomic mass unit? (2010)
Q8. What is nuclear fission? (2010)
Q9. The decay constant of a radioactive substance is 5.3×10^-3 per year. Calculate its half life? (2010)
Q10. What is the size of an atom? (2011)
Q11. Differentiate between isotopes and isobars. (2011)
Q12. State Bohr’s postulate of hydrogen spectrum. (2011)

Q13. Radioactivity is a phenomenon associated with -( 2012)
a. Decay of nucleus
b. Production of radio waves
c. Transmission of radio waves
d. None of above
Q14. What is the significance of binding energy per nucleons? (2012)
Q15. Write down the radioactive decay law. Prove that the expression of half lifetime is given by T=0.693/λ, Where λ is decay constant? (2013)
Q16. Using Bohr’s atomic model find the wave number of Lyman series and Balmer series in hydrogen spectrum. (2013)

Q17. Which of the following can be deflected by applying magnetic field? (2014)
a. α rays
b. β rays
c. γ rays
d. Both a and b
Q18. What is mass detect? Give its unit. (2014)
Q19. Give Rutherford’s nuclear model of atom. What is its drawback? (2014, 2016, 2020)
Q20. What is Rydberg’s constant? Mention its unit. (2015)
Q21. What is radioactivity? Mention two properties each of alpha rays and beta rays. (2015)

Q22. Radio waves are reflected from –
a. Ionosphere
b. Stratosphere
c. Troposphere
d. Both B and C
Q23. Define mass defect and nuclear binding energy. (2016, 2018)
Q24. Beta particles are fast moving :- (2017)
a. Electrons
b. Protons
c. Neutron
d. Photons
Q25. What is nuclear fission? Give an example. (2017)
Q26. What is radioactivity derive relation N=N₀ e^{– λt} ,where terms have their usual meanings. (2017)
Q27. Mention the postulates of Bohr’s model of atom. What are the limitations of Bohr’s model? (2018)

Q28. What are isotopes isobars and isotones? Give one example for each. (2019)
Q29. Mention Rutherford’s atomic model. (2020)

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