Yakeen NEET 5.0 2025 Physics Atoms PDF

NEET Yakeen NEET 5.0 (2025) Physics DPP...

NEET Yakeen NEET 5.0 (2025) Physics DPP: 1 Atoms Q1 Balmers formula for spectral series of hydrogen (C) Kinetic energy and total energy decrease but is potential energy increases (A) 1 = R( 1 − 1 2 ) (D) Its kinetic energy increases but potential λ 4 n energy and total energy decrease (B) 1 = R( 1 − 1 2 ) λ 2 n (C) 1 1 1 Q5 According to Bohrs model, the ratio of = R( − ) n2 atomic radius of the First Orbit in Hydrogen λ 9 (D) 1 1 1 λ = R( 1 2 − n 2 ) Atom to that of Second Orbit of Li2+ is (A) 3/2 Q2 The shortest wavelength in Balmers series (B) 2/3 for Hydrogen atom is... and this is obtained (C) 4/3 by substituting... in Balmers formula (D) 3/4 1 1 1 = R( − ) λ 4 2 n Q6 Which of the curves may represent the speed of (A) 656.3 nm, n = 3 the electron in a hydrogen atom as a function of (B) 486.1 nm, n = 4 the principal quantum number n ? (C) 410.2 nm, n = 5 (D) 364.6 nm, n = ∞ Q3 Angular momentum of an electron in the hydrogen atom is 3h 2π. Here h is Planck's constant. The Kinetic Energy of this electron is (A) I (B) II (A) 4.53eV (C) III (D) IV (B) 1.51eV (C) 3.4eV Q7 The total energy of an atomic electron is (D) 6.8eV (A) Zero (B) Negative Q4 As an electron makes a transition from an (C) Positive excited state to the ground state of a hydrogen (D) Sometimes positive and sometimes negative like atom/ion Q8 As the quantum number increases, the difference of energy between consecutive energy levels (A) Decrease (B) Increases (A) Kinetic energy, potential energy and total (C) First decreases & then increases energy decreases (D) Remains the same (B) Kinetic energy decreases, potential energy Q9 increases but total energy remains same Android App | iOS App | PW Website  NEET The first excitation potential of the hydrogen atom in the ground state is (A) 13.6 V (B) 10.2 V (C) 3.4 V (B) (D) 1.89 V Q10 According to Bohr's atomic model (A) An atom has heavy, positively charged (C) nucleus (B) The electron radiates energy only when it jumps to another orbit (C) The electron can move only in particular orbits (D) All the above statements are correct (D) Q11 The ionization potential of Li++ ion is (A) 13.6 eV (B) 54.4 eV (C) 122.4 eV (D) 40.8 eV Q15 If the radius of the first orbit of hydrogen atom Q12 Check the correctness of the following is 5.29 × 10 −11 m , the radius of the second statements regarding Bohr model of hydrogen orbit will be atom (A) 21.16 × 10 −11 metre 1. Angular momentum of electron in n = 2 orbit (B) 15.87 × 10 −11 metre is more than in the n = 1 orbit (C) 10.58 × 10 −11 metre 2. The KE of electron in the n = 2 orbit is more (D) 2.64 × 10 −11 metre than in the n = 1 orbit 3. The acceleration of electron in the n = 1 orbit Q16 Which state of triply ionized beryllium ( Be3+ ) is more than in the n = 2 orbit has the same orbital radius as that of the ground Mark which of the following is correct? state of hydrogen? (A) Only 1 and 2 are correct (A) 1 (B) 2 (B) Only 2 and 3 are correct (C) 3 (D) 4 (C) Only 3 and 1 are correct Q17 If the potential energy of electron in Bohrs (D) All the statements are correct atomic model of hydrogen is taken as zero in its Q13 The de-Broglie wavelength of an electron in first orbit, then the P.E. of electron in the 2nd the second orbit of hydrogen atom is equal to orbit of same hydrogen atom will be (A) Perimeter of the orbit (A) +6.8eV (B) Half the perimeter of the orbit (B) 20.4eV (C) Half the diameter of the orbit (C) −3.4eV (D) Diameter of the orbit (D) 27.2eV Q14 The de-Broglie wave present in 3rd Bohr orbit is Q18 When a hydrogen atom is excited from ground (A) state to first excited state its potential energy (A) Increases by 10.4eV (B) Decreases by 10.4eV Android App | iOS App | PW Website  NEET (C) Increases by 20.4eV Total energy of electron in nth orbit is (D) Decreases by 20.4eV proportional to 1 2 n (C) Angular momentum of electron in nth orbit Q19 The ratio of energy of electron in hydrogen is proportional to n atom and hydrogen like helium ion in first orbit is (D) Total energy of electron is equal to its kinetic (A) 1 : 1 energy (B) 1 : 2 (C) 1 : 4 Q25 In case of a hydrogen like atom when an (D) 1 : 8 electron jumps from n = 4 to n = 3 it gives ultraviolet. radiation. The radiation of visible Q20 An electron in Bohrs hydrogen atom has spectrum region may be obtained when angular momentum. The energy of the 2h π transition of electron is from electron is (A) n = 4 to n = 2 (A) −3.4eV (B) n = 3 to n = 2 (B) −0.64eV (C) n = 5 to n = 3 (C) −0.85eV (D) n = 5 to n = 4 (D) −10.25eV Q26 The electron in H -atom undergoes a transition Q21 The energy of an electron in the first orbit of H - from 4th state to ground state. The maximum atom is (Symbols have their usual meaning) number of emission lines will be (A) − Rc h (A) 3 (B) 4 (B) − Rh c (C) 6 (D) 12 (C) - Rch (D) − ch R Q22 The angular momentum of an electron in H-atom is h π , where h is Plancks constant. The kinetic energy of the electron is (A) 13.6eV (B) 3.4eV (C) 6.8eV (D) 27.2eV Q23 If energy of the electron in an H -atom in ground state is taken to be zero, then kinetic energy of the electron in the first excited state will be (A) 3.4eV (B) 6.8eV (C) 10.2eV (D) 13.6eV Q24 Which of the following is not true for Bohr model of hydrogen atom? (A) Radius of nth orbit is proportional to n2 (B) Android App | iOS App | PW Website  NEET Answer Key Q1 (A) Q14 (D) Q2 (D) Q15 (A) Q3 (B) Q16 (B) Q4 (D) Q17 (B) Q5 (D) Q18 (C) Q6 (C) Q19 (C) Q7 (B) Q20 (C) Q8 (A) Q21 (C) Q9 (B) Q22 (B) Q10 (D) Q23 (A) Q11 (C) Q24 (D) Q12 (C) Q25 (D) Q13 (B) Q26 (C) Android App | iOS App | PW Website