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Showing 2176 to 2200 of 3046 questions (page 88 of 122).

2176. The equation of continuity for an incompressible fluid states that

A. A v is constant B. P + rho g h is constant C. A/v is constant D. rho v is constant E. P v is constant

2177. In simple harmonic motion, the acceleration of the body is

A. zero at the extreme positions B. directly proportional to displacement and in the same direction C. directly proportional to displacement and opposite in direction D. inversely proportional to displacement E. constant

2178. The time period of a simple pendulum is proportional to

A. L B. 1/sqrt(L) C. L2 D. sqrt(L) E. 1/L

2179. The time period of a mass m attached to a spring of spring constant k is

A. 2 pi sqrt(m/k) B. 2 pi sqrt(mk) C. 2 pi sqrt(k/m) D. (1/2 pi) sqrt(m/k) E. 2 pi m k

2180. The total energy of a body executing SHM is proportional to

A. displacement B. inverse of the amplitude C. square root of the amplitude D. amplitude E. square of the amplitude

2181. The phase difference between displacement and acceleration in SHM is

A. 45 degrees B. 180 degrees C. 270 degrees E. 90 degrees

2182. In SHM, kinetic energy is maximum at

A. half of the amplitude B. the extreme position C. the mean position D. all positions equally E. one quarter of the amplitude

2183. If the length of a simple pendulum is made four times, its time period becomes

A. unchanged B. one fourth C. half D. four times E. double

2184. The speed of sound in dry air at 0 degrees Celsius is about

A. 1500 m s-1 B. 5000 m s-1 C. 332 m s-1 D. 300 m s-1 E. 343 m s-1

2185. The number of beats heard per second when two tuning forks of frequencies 256 Hz and 260 Hz sound together is

A. 516 B. 2 C. 256 D. 4 E. 8

2186. The distance between two consecutive nodes in a stationary wave is

A. lambda/4 B. lambda/2 C. lambda/8 D. 2 lambda E. lambda

2187. Newton's formula for the speed of sound in air was corrected by Laplace by assuming the process is

A. adiabatic B. isochoric C. isothermal D. isobaric E. irreversible

2188. The fundamental frequency of an open organ pipe of length L is

A. v/L B. v/2L C. v/4L D. 2v/L E. 4v/L

2189. The speed of sound in a gas is proportional to

A. 1/T B. 1/sqrt(T) C. sqrt(T) D. T2 E. T

2190. The apparent change in the frequency of sound due to relative motion between source and observer is called

A. the Doppler effect B. interference C. resonance D. diffraction E. polarization

2191. A stationary wave is produced when two waves of equal frequency and amplitude travel

A. with different speeds B. in the same direction C. with a phase difference of 90 degrees D. in opposite directions E. at right angles

2192. In Young's double slit experiment, the fringe spacing is given by

A. d lambda / L B. lambda / dL C. L / d lambda D. d L / lambda E. lambda L / d

2193. Polarization of light establishes that light waves are

A. transverse B. stationary C. mechanical D. non-periodic E. longitudinal

2194. The grating equation for normal incidence is

A. d sin theta = lambda / n B. d sin theta = n lambda C. d cos theta = n lambda D. sin theta = n d lambda E. d tan theta = n lambda

2195. According to Brewster's law, the tangent of the polarizing angle equals

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

2196. For two sources to produce a sustained interference pattern, they must be

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

2197. Newton's rings are formed due to interference in

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

2198. Bending of light around the edges of an obstacle is called

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

2199. The magnifying power of a simple microscope with the image at the near point is

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

2200. The least distance of distinct vision for a normal human eye is

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

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