JEE Physics - MCQ Practice Questions
Physics is where JEE ranks are usually won or lost, since a single conceptual slip changes the whole answer. Questions here span mechanics, rotational motion, thermodynamics, waves and oscillations, electrostatics, current electricity, magnetism, optics, and modern physics. Numerical problems carry full derivations so you can see which step you skipped, not just which option was right.
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The de Broglie wavelength of an electron accelerated through a potential difference of 100 V is approximately:
In a hydrogen atom, the ground state energy is -13.6 eV. What is the energy required to ionize from n=3?
When a moving electron is stopped completely in matter, the kinetic energy is converted to:
In X-ray production, the minimum wavelength of continuous X-ray spectrum depends on:
In Compton effect, the wavelength shift depends on:
The de Broglie wavelength of a neutron at room temperature (T = 300 K) is approximately:
An electron transitions from n=3 to n=1 in hydrogen atom. The frequency of emitted photon is (R = 1.097×10⁷ m⁻¹):
The nuclear radius of a nucleus with mass number A is given by R = R₀A^(), where R₀ ≈ 1.2 fm. For ⁸⁸₃₈Sr, the nuclear radius is approximately:
The decay constant λ of a radioactive substance and its half-life t₁/₂ are related by:
An electron and a proton have the same kinetic energy. The ratio of their de Broglie wavelengths is:
In nuclear fission of ²³⁵U, approximately 200 MeV energy is released. The mass defect in this reaction is approximately:
A nucleus ⁹⁴₃₈Sr undergoes beta-minus decay followed by another beta-minus decay. The final nucleus is:
A photon of frequency 6 × 10¹⁵ Hz is incident on a metal surface with work function 2 eV. What is the maximum kinetic energy of the ejected photoelectron? (h = 4.14 × 10⁻¹⁵ eV·s)
An electron in the first excited state of hydrogen atom (n=2) transitions to ground state (n=1). The wavelength of emitted photon is approximately:
The de Broglie wavelength of an electron with kinetic energy 50 eV is:
In Compton scattering, a photon collides with a free electron at rest. Which quantity always increases?
The activity of a radioactive sample decreases from 8000 Bq to 1000 Bq in 20 hours. The half-life of the sample is:
In a nuclear reactor, control rods are used to absorb neutrons. Which isotope is commonly used in control rods?
A radioactive nucleus ₆₀₂₇Co undergoes beta-plus decay. The daughter nucleus is:
The threshold frequency for photoelectric effect in a metal is 6 × 10¹⁴ Hz. The work function of the metal is: