Physics

Free set

Showing 1326 to 1350 of 1648 questions (page 54 of 66).

1326. The lift on an aeroplane wing arises because the air above the wing moves

A. slower, giving higher pressure above B. at the same speed as below C. faster, giving lower pressure above D. only in turbulent flow E. in the opposite direction

1327. The SI unit of surface tension is

A. N m-2 B. N m-1 C. J m D. N m E. N m2

1328. A liquid rises in a capillary tube because of

A. surface tension and adhesion B. atmospheric temperature C. viscosity D. its density alone E. turbulence

1329. The potential energy of a body in SHM at displacement x is

A. (1/2)kx B. (1/2)k/x C. kx D. kx2 E. (1/2)kx2

1330. Resonance occurs when the frequency of the driving force

A. is doubled B. is zero C. is much higher than the natural frequency D. equals the natural frequency of the system E. is much lower than the natural frequency

1331. The effect of damping on an oscillating system is to

A. increase the amplitude B. reduce the amplitude progressively C. increase the natural frequency indefinitely D. keep the amplitude constant E. reverse the phase

1332. The time period of a simple pendulum taken to the Moon, where g is about one sixth of its value on Earth, will

A. become infinite B. increase C. become zero D. decrease E. remain the same

1333. 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)

1334. 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

1335. Sound waves in air are

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

1336. A closed organ pipe produces

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

1337. 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

1338. 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

1339. 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

1340. 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

1341. 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

1342. 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

1343. 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

1344. 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

1345. 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

1346. 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

1347. 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

1348. 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

1349. 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

1350. 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

Previous 1 2 … 52 53 54 55 56 … 65 66 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans