NEET UG Optics — practice questions
92 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice NEET UG Optics in the app →A student says that if a real image formed by a convex lens can no longer be seen on a screen after the screenIn Fig. 9.27, the ray in air makes an angle of $60^\circ$ with the normal. The corresponding refracted angles A telescope has an objective lens of focal length $120\,\text{cm}$ and an eyepiece of focal length $5\,\text{cThe magnifying power of a telescope in normal adjustment is given byA compound microscope has objective focal length $f_o$ and eyepiece focal length $f_e$. If all other parameterThe approximate magnifying power of a compound microscope is given byWhy does a simple microscope provide magnification even though the angular size of the object equals the angulA student adjusts a simple microscope so that the final image is at infinity instead of at the least distance For a simple microscope, when the final image is formed at the least distance of distinct vision $D$, the magnA compound microscope has objective focal length $f_o=1.0\,\mathrm{cm}$, eyepiece focal length $f_e=2.0\,\mathFor a combination of thin lenses in contact, if the individual magnifications are $m_1, m_2, m_3, \dots$, thenTwo thin lenses of focal lengths $f_1$ and $f_2$ are in contact. What is the correct expression for the effectA lens has power $-4.0\,\mathrm{D}$. Which interpretation is correct?
$ into glass $(n_2=1.5)$ through a spherical surface of radius of curvature $R=Which set of conditions is necessary for total internal reflection to occur at an interface?
. The scaA 0.5 kg stone tied to a string is whirled in a horizontal circle of radius 2 m at a speed of 4 m s⁻¹. The tenThe maximum speed at which a car can round an unbanked circular turn of radius 150 m without skidding is (μs =A 3 kg block hangs from a light string passing over a frictionless pulley and pulls a 20 kg trolley along a hoFor a 3 kg block connected over a frictionless pulley to a 20 kg trolley (μk = 0.04, g = 10 m s⁻²), the tensioA 6 kg mass hangs from a light rope. A horizontal force of 50 N is applied at the rope's midpoint (g = 10 m s⁻One ball strikes a wall normally and rebounds with unchanged speed; an identical ball strikes at 30° to the noA net force F = 6t newton (t in seconds) acts on a 2 kg body initially at rest. The speed of the body at t = 4A block slides down a rough incline of 30° with coefficient of kinetic friction 0.2 (g = 10 m s⁻²). Its acceleA lift descends with a downward acceleration equal to g. The apparent weight of a passenger standing inside isA 10 N horizontal force is applied to a 2 kg block that pushes a 3 kg block in contact with it on a frictionleA 0.2 kg ball strikes the floor vertically at 10 m s⁻¹ and rebounds at 8 m s⁻¹. The magnitude of the impulse iThe optimum (design) speed for a car on a frictionless road banked at 45° along a curve of radius 100 m is (g Per NCERT §4.5 (definition of momentum), the momentum p of a body of mass m moving with velocity v is which?Per NCERT §4.3 (frictionless horizontal surface), a body moving on it must do which?Per NCERT §4.5 (Summary 4), Newton's SECOND law in SI units states which relation?Per NCERT §4.5, the SI unit of force is the newton, with one newton equal to which value?Per NCERT §4.5 (Impulse), the IMPULSE J of a force F acting for time Δt equals which quantity?Per NCERT §4.5, a constant force applied for the SAME time to two bodies of different masses (initially at resPer NCERT §4.5, for a body of constant mass, the second law reduces to which form?Per NCERT §4.5, the impulse-momentum theorem states that the impulse on a body equals which quantity?Per NCERT §4.7, the total momentum of an ISOLATED system (no external force) is which?Per NCERT §4.7, conservation of momentum applies in which kind of collisions between two bodies?Per NCERT §4.6 (action and reaction labelling), which statement about the labels is true?Per NCERT §4.9.1, KINETIC (sliding) friction is approximately given by which relation?Per NCERT §4.9.1, the coefficients of static and kinetic friction satisfy which order?A gun of mass $4$ kg fires a bullet of mass $0.04$ kg at $300$ m/s. Recoil speed of the gun is:A galvanometer of resistance G can be converted into a voltmeter of range V by connecting in series a high resTwo 100-W bulbs are connected in series across 220 V. The total power consumed is:The angle of reflection is equal to the angle of:The incident ray, the reflected ray and the normal all lie in:Snell's law introduces a constant known as the:The refractive index for a pair of media is independent of the:If the refractive index is greater than one, the refracted ray bends:In total internal reflection, transmission of light is:In ordinary reflection, the reflected ray is always:The critical angle is the angle of incidence for which refraction is:The critical angle of water with respect to air is about:The refractive index of water is:The refractive index of diamond is:The critical angle of diamond is about:Crown glass has a refractive index of:The SI unit for the power of a lens is the:A lens of focal length one metre has a power of:The power of a converging lens is:A prescribed lens of power plus 2.5 D is a convex lens of focal length:A lens of power minus 4.0 D is a concave lens of focal length:In the visible spectrum, red light lies at the:Violet light has a wavelength of about:Dispersion happens because the refractive index differs with:Which colour travels fastest in a glass prism?