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#	Question	Subject and topic	Difficulty
161	A cricket ball of mass 0.12 kg moves at 20 m/s. What is its de Broglie wavelength, approximately? (h = 6.63 ×…	Physics Matter waves	Medium
162	A proton and an alpha particle are each accelerated from rest through the same potential difference. What is …	Physics Matter waves	Hard
163	In the alpha-particle scattering experiment, most alpha particles passed straight through the gold foil. This…	Physics Atomic models	Easy
164	What is the energy of the electron in the n = 3 orbit of a hydrogen atom?	Physics Atomic models	Easy
165	The radius of the first Bohr orbit of hydrogen is 0.529 Å. What is the radius of the second orbit?	Physics Atomic models	Medium
166	An electron in a hydrogen atom jumps from n = 3 to n = 2. What are the photon energy and wavelength, approxim…	Physics Atomic models	Medium
167	What is the shortest wavelength in the Lyman series of hydrogen? (R = 1.097 × 10⁷ m⁻¹)	Physics Atomic models	Hard
168	How many neutrons are present in a nucleus of ²³⁸₉₂U?	Physics Nucleus	Easy
169	Which property correctly describes the nuclear force between nucleons?	Physics Nucleus	Easy
170	¹⁹⁸₈₀Hg and ¹⁹⁷₇₉Au are examples of:	Physics Nucleus	Medium
171	Taking R₀ = 1.2 fm, what is the radius of the ²⁷Al nucleus?	Physics Nucleus	Medium
172	What is the ratio of the radius of a nucleus with mass number 125 to that of a nucleus with mass number 8?	Physics Nucleus	Hard
173	The energy equivalent of 1 atomic mass unit is about:	Physics Mass-energy and binding energy	Easy
174	The binding energy per nucleon is highest for nuclei with mass number close to:	Physics Mass-energy and binding energy	Easy
175	If 1 g of matter were completely converted into energy, how much energy would be released?	Physics Mass-energy and binding energy	Medium
176	Given m(¹H) = 1.007825 u, m_n = 1.008665 u and m(²H) = 2.014102 u, what is the binding energy of the deuteron?	Physics Mass-energy and binding energy	Medium
177	Using m(¹H) = 1.007825 u, m_n = 1.008665 u and m(⁴He) = 4.002603 u, what is the binding energy per nucleon of…	Physics Mass-energy and binding energy	Hard
178	In a nuclear reactor, cadmium rods are used to:	Physics Nuclear fission and fusion	Easy
179	The main purpose of a moderator such as heavy water in a reactor is to:	Physics Nuclear fission and fusion	Easy
180	In the reaction ²³⁵₉₂U + ¹₀n → ¹⁴⁴₅₆Ba + ⁸⁹₃₆Kr + x ¹₀n, what is the value of x?	Physics Nuclear fission and fusion	Medium