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Showing 751 to 775 of 3046 questions (page 31 of 122).

751. A person in a lift accelerating upwards with acceleration a experiences an apparent weight of

A. m(g - a) B. m(g + a) C. mg D. ma E. zero

752. Angular velocity and linear velocity for a particle in circular motion are related by

A. v = omega/r B. omega = v r C. v = omega r2 D. omega = v2/r E. v = r omega

753. The terminal velocity of a small sphere falling through a viscous fluid is proportional to

A. 1/r B. 1/r2 C. r2 D. r E. r3

754. Bernoulli's equation is a statement of the conservation of

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

755. A Venturi meter is used to measure

A. atmospheric pressure B. density of a liquid C. viscosity of a liquid D. surface tension E. speed of fluid flow

756. The SI unit of coefficient of viscosity is

A. N m s-1 B. N m-2 C. N m D. N s m-2 E. kg m-1

757. According to Torricelli's theorem, the speed of efflux of a liquid from a small hole at depth h below the free surface is

A. sqrt(gh/2) B. sqrt(2gh) C. 2gh D. sqrt(gh) E. gh

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

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

759. 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

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

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

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

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

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

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

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

764. In SHM, kinetic energy is maximum at

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

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

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

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

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

767. 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

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

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

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

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

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

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

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

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

772. 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. polarization D. diffraction E. interference

773. 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

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

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

775. Polarization of light establishes that light waves are

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

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