Physics

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Showing 201 to 225 of 1648 questions (page 9 of 66).

201. According to Brewster's law, the tangent of the polarizing angle equals

A. the wavelength B. the refractive index of the medium C. the reciprocal of the refractive index D. unity E. the critical angle

202. For two sources to produce a sustained interference pattern, they must be

A. of different frequencies B. coherent C. of different amplitudes D. perpendicular to each other E. incoherent

203. Newton's rings are formed due to interference in

A. a thick glass block B. a wedge shaped air film C. a plane parallel plate D. a diffraction grating E. a polarizer

204. Bending of light around the edges of an obstacle is called

A. refraction B. interference C. diffraction D. dispersion E. polarization

205. The magnifying power of a simple microscope with the image at the near point is

A. d/f B. 1 + d/f C. 1 - d/f D. f/d E. 1 + f/d

206. The least distance of distinct vision for a normal human eye is

A. 10 cm B. 25 cm C. 50 cm D. 1 m E. infinity

207. Light propagates along an optical fibre mainly by

A. diffraction B. dispersion C. total internal reflection D. polarization E. refraction at the far end

208. The resolving power of a telescope increases when

A. the wavelength is increased B. the aperture is increased C. the focal length of the eyepiece is increased D. the magnification is reduced E. the aperture is decreased

209. In a compound microscope, the objective forms an image that is

A. virtual and erect B. real, inverted and magnified C. real and diminished D. virtual and diminished E. at infinity

210. The value of the universal gas constant R in SI units is

A. 0.0821 B. 8.314 C. 1.987 D. 62.4 E. 0.083

211. The first law of thermodynamics is a statement of the conservation of

A. mass B. momentum C. energy D. entropy E. charge

212. For an isothermal expansion of an ideal gas, the change in internal energy is

A. positive B. negative C. zero D. equal to the work done E. equal to the heat absorbed times gamma

213. For one mole of an ideal gas, Cp - Cv equals

B. R C. R/2 D. 2R E. gamma R

214. The efficiency of a Carnot engine operating between temperatures T1 (source) and T2 (sink) is

A. 1 - T1/T2 B. 1 - T2/T1 C. T2/T1 D. T1/T2 E. T1 - T2

215. A Carnot engine works between 500 K and 300 K. Its efficiency is

A. 20% B. 40% C. 60% D. 80% E. 30%

216. In an adiabatic process

A. temperature remains constant B. pressure remains constant C. no heat enters or leaves the system D. volume remains constant E. internal energy remains constant

217. For any spontaneous natural process, the entropy of the universe

A. decreases B. remains constant C. increases D. becomes zero E. becomes negative

218. The value of the Coulomb constant 1/(4 pi epsilon_0) in SI units is about

A. 9 x 10^9 B. 8.85 x 10^-12 C. 6.63 x 10^-34 D. 1.6 x 10^-19 E. 3 x 10^8

219. The electric field intensity inside a hollow charged conductor in electrostatic equilibrium is

A. maximum B. uniform and non-zero C. zero D. infinite E. equal to the surface field

220. The capacitance of a parallel plate capacitor with plate area A and separation d in vacuum is

A. epsilon_0 d / A B. epsilon_0 A / d C. A d / epsilon_0 D. epsilon_0 A d E. d / epsilon_0 A

221. Three capacitors of 3 microfarad each are connected in series. The equivalent capacitance is

A. 9 microfarad B. 3 microfarad C. 1 microfarad D. 0.33 microfarad E. 6 microfarad

222. The energy stored in a capacitor of capacitance C charged to potential difference V is

A. CV B. CV2 C. (1/2)CV2 D. (1/2)CV E. C2V

223. Inserting a dielectric slab between the plates of a capacitor at constant charge

A. increases the potential difference B. decreases the capacitance C. increases the capacitance D. has no effect E. increases the electric field

224. Gauss's law relates the electric flux through a closed surface to

A. the surface area B. the charge enclosed C. the field at the surface only D. the potential at the centre E. the volume enclosed

225. Kirchhoff's first rule is based on the conservation of

A. energy B. charge C. momentum D. mass E. flux

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