Structure Of Atoms 5 DPP PDF

VIDYAVATIKA PATHSHALA (ANDHARA BAZAR) Daily Practice Sheet 5 - Structure of Atom Student Copy Only Do not share in public domain By :- Rupesh Thakur 1) Wha...

VIDYAVATIKA PATHSHALA (ANDHARA BAZAR) Daily Practice Sheet 5 - Structure of Atom Student Copy Only Do not share in public domain By :- Rupesh Thakur 1) What is the value of electron gain enthalpy of , if क्या है इले क्ट्रॉ न गे न एं थैल्पी का मूल्य a) +2.55 eV b) +10.2 eV c) -5.1 eV d) -10.2 eV 2) Ratio of radii of second and first Bohr orbits of H atom एक परमाणु की दू सरी और पहली बोर कक्षाओं की त्रिज्या का अनुपात है a) 2 b) 3 c) 4 d) 5 3) According to Bohr’s principle, the relation between principal quantum number (n) and radius of orbit is बोर के त्रसद्ां त के अनुसार, प्रमुख क्ां टम संख्या (n) और कक्षा के त्रिज्या के बीच संबंध है a) b) c) d) 4) When beryllium is bombarded with - particles, extremely penetrating radiations which cannot be deflected by electrical or magnetic field are given out. These are जब बे ररत्रलयम आनुपात्रतक कणों के साथ बमबारी की जाती है , तो अत्यं त मममज्ञ त्रित्रकरण त्रजन्हें त्रिद् युत या चुंबकीय क्षेि द्वारा त्रिक्षेत्रपत नहीं त्रकया जा सकता है , उन्हें बाहर कर त्रदया जाता है । ये हैं a) A beam of protons b) α-ray c) A beam of neutrons d) X-ray 5) When an electron drops from a higher energy level to a low energy level, then जब एक इले क्ट्रॉ न एक उच्च ऊजाम स्तर से एक कम ऊजाम स्तर तक त्रगरता है , तो a) Energy is emitted b) Energy is absorbed c) Atomic number increases d) Atomic number decreases 6) What is the packet of energy called ऊजाम के पैकेट को क्या कहा जा ता है a) Electron b) Photon c) Positron d) Proton 7) The radius of the first Bohr orbit of the H atoms is r. Then the radius of the first orbit of will be H परमा णुओं की पहली बो र कक्षा की त्रि ज्या r है । त्रि र की त्रि ज्या हो गी a) r/9 b) r/3 c) 3r d) 9r 8) The radius of first Bohr’s orbit for hydrogen is the radius of third Bohr’s orbit would be हाइड्रो जन के त्रलए पहले बोर की कक्षा की त्रिज्या तो तीसरे बोर की कक्षा की त्रिज्या होगी a) b) c) d)  VIDYAVATIKA PATHSHALA (ANDHARA BAZAR) Answers 1) C. Electron given enthalpy of =-5.1volt 2) B. Bohr radius 3) B. Bohr suggested a formulae to Calculate the radius and energy of each orbit and gave the following formulae Where except , all other unit are constants so 4) C. Neutron is a chargeless particles, so it does not get deflected by electric or magnetic field. 5) A. 6) B. According to quantum theory of radiation, a hot body emits radiant energy not continuously but discontinuously in the from of small packets of energy called quanta or photons. 7) B. Formula for radius of H-Like species 8) D. The End