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Showing 2426 to 2450 of 3046 questions (page 98 of 122).

2426. The displacement of a body in SHM starting from the mean position is described by

A. x = omega t B. x = x0 cos(omega t) C. x = x0 tan(omega t) D. x = x0 omega t E. x = x0 sin(omega t)

2427. A sound wave of frequency 170 Hz travels at 340 m s-1. Its wavelength is

A. 2 m B. 1 m C. 0.5 m D. 4 m E. 0.2 m

2428. Sound waves in air are

A. transverse B. polarized C. longitudinal D. stationary only E. electromagnetic

2429. A closed organ pipe produces

A. only even harmonics B. all harmonics C. no harmonics D. only odd harmonics E. only the fundamental

2430. The fundamental frequency of a closed organ pipe of length L is

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

2431. When a source of sound approaches a stationary observer, the observed frequency

A. decreases B. first decreases then increases C. remains the same D. increases E. becomes zero

2432. The speed of a transverse wave on a stretched string of tension F and mass per unit length mu is

A. F mu B. sqrt(F/mu) C. sqrt(F mu) D. F/mu E. mu/F

2433. The intensity level of sound is measured in decibels on a scale that is

A. quadratic B. exponential C. logarithmic D. linear E. inverse square

2434. Dark fringes in a two slit interference pattern occur where the path difference is

A. (n + 1/2) lambda B. zero only C. n lambda D. 2 n lambda E. n lambda / 2

2435. The colours seen in a thin film of oil on water are due to

A. scattering B. polarization C. dispersion D. interference of light reflected from the two surfaces E. total internal reflection

2436. A wavefront is a surface on which all points have

A. the same amplitude B. zero displacement C. the same wavelength only D. maximum intensity E. the same phase

2437. According to Huygens' principle, each point on a wavefront acts as

A. a source of secondary spherical wavelets B. a node C. an absorber D. a polarizer E. a mirror

2438. In Young's experiment, if the separation between the slits is increased, the fringe spacing

A. increases B. decreases C. doubles D. becomes zero immediately E. remains the same

2439. The angular magnification of an astronomical telescope in normal adjustment is

A. fo/fe B. fo x fe C. fe/fo D. 1 + fo/fe E. fo - fe

2440. The defect of vision in which a person cannot see distant objects clearly is corrected using

A. a bifocal lens B. a plane mirror C. a cylindrical lens D. a concave lens E. a convex lens

2441. An endoscope used in medicine works on the principle of

A. interference B. polarization C. dispersion D. diffraction E. total internal reflection through optical fibres

2442. The value of the Boltzmann constant is about

A. 1.38 x 10^-23 J K-1 B. 6.63 x 10^-34 J s C. 9.1 x 10^-31 J K-1 D. 1.6 x 10^-19 J E. 8.314 J K-1

2443. The work done by a gas expanding at constant pressure is

A. (1/2)P V B. P times the change in volume C. zero D. nRT ln(V2/V1) E. V times the change in pressure

2444. In an isochoric process, the work done by the gas is

A. negative B. equal to the heat supplied C. P delta V D. nRT E. zero

2445. The triple point of water is

A. 100 K B. 273.16 K C. 273.15 K D. 0 K E. 373.15 K

2446. A heat engine cannot have an efficiency of 100 per cent because

A. some heat must always be rejected to the sink B. the first law forbids it C. the working substance has mass D. friction is unavoidable in practice only E. fuel is limited

2447. The force between two charges placed in a medium of relative permittivity 4 compared with that in vacuum becomes

A. half B. twice C. unchanged D. one quarter E. four times

2448. The electric potential at distance r from a point charge q is

A. kq r2 B. kqr C. kq/r D. kq/r2 E. kr/q

2449. One electron volt is equal to

A. 1.6 x 10^19 J B. 1.6 x 10^-19 J C. 1 J D. 9.1 x 10^-31 J E. 6.63 x 10^-34 J

2450. The charge stored on a 2 microfarad capacitor charged to 100 V is

A. 2 x 10^-6 C B. 2 C C. 200 C D. 2 x 10^-4 C E. 2 x 10^-2 C

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