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#	Question	Subject and topic	Difficulty
5021	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
5022	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
5023	What is the shortest wavelength in the Lyman series of hydrogen? (R = 1.097 × 10⁷ m⁻¹)	Physics Atomic models	Hard
5024	How many neutrons are present in a nucleus of ²³⁸₉₂U?	Physics Nucleus	Easy
5025	Which property correctly describes the nuclear force between nucleons?	Physics Nucleus	Easy
5026	¹⁹⁸₈₀Hg and ¹⁹⁷₇₉Au are examples of:	Physics Nucleus	Medium
5027	Taking R₀ = 1.2 fm, what is the radius of the ²⁷Al nucleus?	Physics Nucleus	Medium
5028	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
5029	The energy equivalent of 1 atomic mass unit is about:	Physics Mass-energy and binding energy	Easy
5030	The binding energy per nucleon is highest for nuclei with mass number close to:	Physics Mass-energy and binding energy	Easy
5031	If 1 g of matter were completely converted into energy, how much energy would be released?	Physics Mass-energy and binding energy	Medium
5032	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
5033	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
5034	In a nuclear reactor, cadmium rods are used to:	Physics Nuclear fission and fusion	Easy
5035	The main purpose of a moderator such as heavy water in a reactor is to:	Physics Nuclear fission and fusion	Easy
5036	In the reaction ²³⁵₉₂U + ¹₀n → ¹⁴⁴₅₆Ba + ⁸⁹₃₆Kr + x ¹₀n, what is the value of x?	Physics Nuclear fission and fusion	Medium
5037	Nuclear fusion needs extremely high temperatures mainly because:	Physics Nuclear fission and fusion	Medium
5038	Each fission of U-235 releases about 200 MeV. Roughly how much energy is released if all the nuclei in 1 kg o…	Physics Nuclear fission and fusion	Hard
5039	In which type of solid do the valence and conduction bands overlap?	Physics Energy bands	Easy
5040	Diamond is a good electrical insulator mainly because:	Physics Energy bands	Easy