Physics

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Showing 776 to 800 of 1648 questions (page 32 of 66).

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

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

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

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

778. 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)

779. 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

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

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

781. 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

782. 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

783. 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

784. 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

785. 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

786. 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

787. 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

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

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

789. 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

790. 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

791. 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

792. Polarization of light establishes that light waves are

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

793. 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

794. 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

795. 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

796. 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

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

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

798. 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

799. 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

800. Light propagates along an optical fibre mainly by

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

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