JEE Physics - MCQ Practice Questions

A photon of energy 13.6 eV ionizes a hydrogen atom in its ground state. What is the kinetic energy of the ejected electron?

Which of the following correctly represents the order of penetrating power of nuclear radiations?

The de Broglie wavelength of a neutron moving with kinetic energy 1 eV is approximately:

In the photoelectric effect, the stopping potential V₀ for a metal is 2 V when light of wavelength 400 nm is incident. The work function of the metal is approximately:

Two radioactive nuclei A and B have decay constants λₐ and λᵦ respectively, where λₐ = 2λᵦ. Initially, both have the same number of nuclei. The ratio of their half-lives (t₁/₂ₐ : t₁/₂ᵦ) is:

The binding energy per nucleon of ²⁵⁶Fe (Z=26) is 8.8 MeV. The total binding energy of this nucleus is approximately:

A nucleus undergoes beta-minus decay. Which of the following is correct?

An electron transitions from n=3 to n=1 in a hydrogen atom. The ratio of wavelengths emitted to that expected for Lyman alpha (n=2 to n=1) is:

The angular momentum of an electron in the Bohr model is quantized as:

A nucleus of mass number A and atomic number Z emits an alpha particle. The recoil kinetic energy of the daughter nucleus is 0.5 MeV. What is the kinetic energy of the alpha particle? (Assume non-relativistic motion)

The threshold energy for photodisintegration of a deuteron (D → p + n) by a photon is approximately 2.22 MeV. This means:

In Compton scattering, a photon of wavelength λ₀ collides with a stationary electron. After scattering at angle θ = 90°, the wavelength becomes λ. The relationship is:

A radioactive sample has a half-life of 10 days. After how many days will 93.75% of the sample decay?

The frequency of K-alpha X-ray for a target material depends on:

In a nuclear reaction, ¹⁴₇N + ⁴₂He → ¹⁷₈O + ?. The missing particle is:

The cutoff wavelength (λ₀) in X-ray spectrum produced by deceleration of electrons is determined by:

Which statement about nuclear forces is correct?

An excited hydrogen atom transitions from state with energy E₂ to state with energy E₁. The energy difference is hf. Which Bohr orbit transitions match this for hydrogen?

The ionization energy of He⁺ (hydrogen-like ion) is:

In a cathode ray tube with accelerating potential V, electrons reach the anode with kinetic energy. If V is doubled, the maximum frequency of X-rays produced will: