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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In a single slit diffraction pattern, the first minima on either side of the central maximum occur at angular positions where the path difference is:
A lens has power +5 D. A second lens of power -2 D is placed in contact with it. The equivalent focal length of the combination is:
A monochromatic light source produces a diffraction pattern using a diffraction grating. If the wavelength is decreased, the diffraction angle for the first order maximum will:
An air bubble of radius 2 mm is formed in water (refractive index 1.33). The critical angle for light traveling from water to air is approximately:
In a compound microscope, the objective has focal length 0.5 cm and eyepiece has focal length 5 cm. If the least distance of distinct vision is 25 cm, the magnifying power is:
When unpolarized light of intensity I₀ passes through two polarizers whose transmission axes are at 60° to each other, the final intensity is:
The refractive index of a material is found to be 1.5. The speed of light in this material is:
In a fiber optics cable, light undergoes total internal reflection. The minimum refractive index of the core material needed to guide light from air is:
An object is at a distance of 20 cm from a convex lens of focal length 15 cm. The nature of the image formed is:
Coherent light from a laser (λ = 632.8 nm) is used in Young's double slit experiment. The distance between slits is 0.5 mm and screen distance is 1 m. The fringe width is:
When light passes through a glass slab of thickness t and refractive index n, the lateral displacement is maximum when the angle of incidence is:
The equivalent focal length of two lenses in contact is 10 cm. If the focal lengths are 15 cm and f₂, then f₂ is:
An astronomical telescope in normal adjustment has objective focal length 100 cm and eyepiece focal length 5 cm. The magnifying power is:
In Brewster's angle incidence, the reflected and refracted rays are:
A thin air gap of thickness d is created between two glass plates. For constructive interference in reflected light with wavelength λ, the condition is:
The resolving power of a telescope is inversely proportional to:
A plane mirror is moved towards a stationary object at a speed of 5 m/s. The speed at which the image approaches the object is:
Light of wavelength 500 nm in vacuum enters a medium of refractive index 1.5. The wavelength in the medium is:
A concave mirror of focal length 20 cm forms a real, inverted, and magnified image. The object must be placed:
Two coherent sources emit light of wavelength λ. If path difference is 2.5λ, the interference will be: