JEE Physics - MCQ Practice Questions

Two coherent sources emit light of wavelength λ. If path difference is 2.5λ, the interference will be:

A convex lens of focal length 30 cm is used as a magnifying glass. For maximum magnification, the object should be placed:

Snell's law is violated when light travels from denser to rarer medium at angle of incidence greater than critical angle because:

In Young's double slit experiment, if one slit is covered with a glass plate of thickness t and refractive index n, the central bright fringe shifts by:

An object is placed 15 cm in front of a concave mirror of radius of curvature 20 cm. The magnification is:

The angle of minimum deviation for a prism is 30° and the prism angle is 60°. The refractive index is:

Diffraction fringes are observed when light passes through a single slit. The first minimum occurs at angle θ where:

A convex and concave lens of focal lengths 20 cm and 30 cm respectively are in contact. Their combined power is:

Light is incident on a transparent glass slab at Brewster's angle. At this angle:

An electron transitions from n=3 to n=1 in a hydrogen atom. The frequency of emitted photon is (Use Rydberg constant R = 1.097×10⁷ m⁻¹):

The threshold frequency for a metal is f₀. If light of frequency 2f₀ is incident, the maximum kinetic energy of photoelectrons is:

A charged particle is accelerated through a potential difference of 100V. Its de Broglie wavelength is λ₁. If accelerated through 400V, the wavelength becomes λ₂. The ratio λ₁/λ₂ is:

The activity of a radioactive sample decreases by 50% in 1 hour. Its half-life is:

The work function of a metal is 2.3 eV. The metal will exhibit photoelectric effect with light of wavelength:

The energy of an α-particle in the ground state of hydrogen-like atom (Z=2) compared to ground state of hydrogen is:

The characteristic X-ray spectrum is produced due to:

According to Heisenberg's uncertainty principle, if the uncertainty in position (Δx) is zero, then uncertainty in momentum (Δp) will be:

The pair production process requires a minimum photon energy of:

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: