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Showing 301 to 325 of 3046 questions (page 13 of 122).

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

311. Polarization of light establishes that light waves are

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

312. The grating equation for normal incidence is

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

313. 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

314. 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

315. 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

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

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

317. 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

318. 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

319. Light propagates along an optical fibre mainly by

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

320. 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

321. 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

322. 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

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

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

324. 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

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

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

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