NEET UG PHYSICS Multiple Choice Questions (MCQs)

226. What is the focal length of a concave mirror?

a) Positive

b) Negative

c) Zero

d) Infinite

Answer: b) Negative

227. The mirror formula is given by:

a) 1/f = 1/v + 1/u

b) 1/f = 1/v - 1/u

c) f = v + u

d) f = v - u

Answer: a) 1/f = 1/v + 1/u

228. What is the refractive index of a medium?

a) The speed of light in the medium

b) The ratio of the speed of light in vacuum to the speed of light in the medium

c) The ratio of wavelength in vacuum to wavelength in the medium

d) Both b and c

Answer: d) Both b and c

229. The lens maker's formula is used to determine the focal length of:

a) Concave mirror

b) Convex lens

c) Concave lens

d) Plane mirror

Answer: b) Convex lens

230. Total internal reflection occurs when light travels from:

a) A denser medium to a rarer medium

b) A rarer medium to a denser medium

c) Two media with the same refractive index

d) A medium with high refractive index to low refractive index

Answer: a) A denser medium to a rarer medium

231. What is the magnification produced by a plane mirror?

a) 1

b) -1

c) 0

d) Infinite

Answer: a) 1

232. The power of a lens is measured in:

a) Diopters

b) Metres

c) Radians

d) Watts

Answer: a) Diopters

233. The combination of two thin lenses in contact has a focal length given by:

a) 1/f = 1/f1 + 1/f2

b) f = f1 + f2

c) f = (f1 × f2) / (f1 + f2)

d) 1/f = (f1 + f2) / (f1 × f2)

Answer: a) 1/f = 1/f1 + 1/f2

234. When light passes through a prism, the angle of deviation depends on:

a) The angle of incidence

b) The refractive index of the material

c) The thickness of the prism

d) All of the above

Answer: d) All of the above

235. The magnifying power of a microscope is given by:

a) 1 + D/f

b) 1 + f/D

c) D/f

d) f/D

Answer: a) 1 + D/f

236. Huygens' principle explains the propagation of light as:

a) Straight lines

b) Waves

c) Particles

d) Electromagnetic pulses

Answer: b) Waves

237. In Young’s double-slit experiment, the fringe width is given by the expression:

a) λD/d

b) d/λD

c) d/λ

d) λ/dD

Answer: a) λD/d

238. The condition for sustained interference of light in Young’s experiment is:

a) The slits must be of different widths

b) The sources must be incoherent

c) The sources must be coherent

d) The sources must have different frequencies

Answer: c) The sources must be coherent

239. In diffraction due to a single slit, the width of the central maximum depends on:

a) Wavelength and slit width

b) Wavelength and distance of screen

c) Slit width and distance of screen

d) Both a and b

Answer: d) Both a and b

240. Brewster's law is related to:

a) Reflection

b) Refraction

c) Polarization

d) Diffraction

Answer: c) Polarization