Physics

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Showing 1201 to 1225 of 1648 questions (page 49 of 66).

1201. 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

1202. 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

1203. 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

1204. 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

1205. 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

1206. 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

1207. 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

1208. The speed of sound in a gas is proportional to

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

1209. 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

1210. 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

1211. 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

1212. Polarization of light establishes that light waves are

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

1213. 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

1214. 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

1215. 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

1216. 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

1217. Bending of light around the edges of an obstacle is called

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

1218. 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

1219. 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

1220. Light propagates along an optical fibre mainly by

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

1221. The resolving power of a telescope increases when

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

1222. In a compound microscope, the objective forms an image that is

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

1223. The value of the universal gas constant R in SI units is

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

1224. The first law of thermodynamics is a statement of the conservation of

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

1225. For an isothermal expansion of an ideal gas, the change in internal energy is

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

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