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Showing 1401 to 1425 of 3046 questions (page 57 of 122).

1401. 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 m k D. (1/2 pi) sqrt(m/k) E. 2 pi sqrt(k/m)

1402. The total energy of a body executing SHM is proportional to

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

1403. The phase difference between displacement and acceleration in SHM is

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

1404. In SHM, kinetic energy is maximum at

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

1405. If the length of a simple pendulum is made four times, its time period becomes

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

1406. The speed of sound in dry air at 0 degrees Celsius is about

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

1407. The number of beats heard per second when two tuning forks of frequencies 256 Hz and 260 Hz sound together is

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

1408. The distance between two consecutive nodes in a stationary wave is

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

1409. Newton's formula for the speed of sound in air was corrected by Laplace by assuming the process is

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

1410. The fundamental frequency of an open organ pipe of length L is

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

1411. The speed of sound in a gas is proportional to

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

1412. The apparent change in the frequency of sound due to relative motion between source and observer is called

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

1413. A stationary wave is produced when two waves of equal frequency and amplitude travel

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

1414. In Young's double slit experiment, the fringe spacing is given by

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

1415. Polarization of light establishes that light waves are

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

1416. The grating equation for normal incidence is

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

1417. According to Brewster's law, the tangent of the polarizing angle equals

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

1418. For two sources to produce a sustained interference pattern, they must be

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

1419. Newton's rings are formed due to interference in

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

1420. Bending of light around the edges of an obstacle is called

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

1421. The magnifying power of a simple microscope with the image at the near point is

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

1422. The least distance of distinct vision for a normal human eye is

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

1423. Light propagates along an optical fibre mainly by

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

1424. 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

1425. In a compound microscope, the objective forms an image that is

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

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