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Showing 1201 to 1225 of 3046 questions (page 49 of 122).

1201. The SI unit of angular acceleration is

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

1202. An ice skater spinning with arms outstretched pulls the arms inwards. The angular velocity

A. becomes zero B. decreases C. reverses D. increases E. stays the same

1203. The moment of inertia of a thin circular hoop of mass M and radius R about its central axis is

A. MR2/4 B. 2MR2/3 C. MR2/2 D. 2MR2/5 E. MR2

1204. The orbital speed of a satellite at distance r from the centre of the Earth is

A. sqrt(GMr) B. GM/r C. sqrt(GM/r) D. GM/r2 E. sqrt(2GM/r)

1205. A body moving in a circle with increasing speed has

A. tangential acceleration only B. zero acceleration C. both centripetal and tangential acceleration D. constant velocity E. centripetal acceleration only

1206. A hydraulic press works on the principle stated by

A. Pascal B. Torricelli C. Bernoulli D. Archimedes E. Stokes

1207. The upthrust on a body immersed in a fluid equals the weight of

A. the body in air B. the fluid above the body C. the body D. the container E. the fluid displaced

1208. The viscosity of a liquid, as the temperature rises,

A. stays constant B. decreases C. first rises then falls D. increases E. becomes infinite

1209. In a horizontal pipe of varying cross section, the pressure is lowest where the

A. pipe is highest B. fluid is at rest C. cross section is largest D. cross section is smallest E. density is greatest

1210. A body falling through a viscous fluid attains terminal velocity when

A. the weight equals the sum of upthrust and drag B. the fluid becomes turbulent C. the acceleration is maximum D. the drag force becomes zero E. the upthrust exceeds the weight

1211. The angular frequency of an oscillation of frequency f is

A. f2 B. 2 pi f C. 1/f D. f/2 pi E. pi f

1212. A simple pendulum of length 1 m has a time period of about

A. 1.0 s B. 3.1 s C. 6.3 s D. 1.4 s E. 2.0 s

1213. Oscillations of a system driven by an external periodic force are called

A. stationary oscillations B. transverse oscillations C. forced oscillations D. free oscillations E. damped oscillations only

1214. At a node in a stationary wave, the displacement is

A. increasing steadily B. zero at all times C. half the amplitude D. maximum E. equal to the wavelength

1215. Sound travels fastest in

A. water B. air C. vacuum D. hydrogen E. steel

1216. The audible frequency range for a normal human ear is about

A. 1 Hz to 1 kHz B. 200 Hz to 200 kHz C. 20 kHz to 200 kHz D. 20 Hz to 20 kHz E. 2 Hz to 200 Hz

1217. Ultrasonic waves are used in medical imaging mainly because they

A. are audible B. cannot be reflected C. have short wavelengths giving good resolution D. travel faster than light E. are ionizing

1218. Light from distant galaxies is shifted towards longer wavelengths, which indicates that they are

A. emitting sound B. stationary C. hotter than the Sun D. receding from us E. approaching us

1219. A tuning fork of frequency 320 Hz gives 4 beats per second with a second fork. The possible frequencies of the second fork are

A. 318 or 322 Hz B. 160 or 640 Hz C. 4 or 640 Hz D. 312 or 328 Hz E. 316 or 324 Hz

1220. Bright fringes in a two slit pattern occur where the path difference is

A. (n + 1/2) lambda B. n lambda C. lambda/4 D. zero only E. 2 lambda only

1221. Two coherent sources are most easily obtained in the laboratory by

A. dividing light from a single source B. using two different lasers C. using sunlight directly D. using two separate lamps E. using two different colours

1222. Polaroid sunglasses reduce glare because reflected light from horizontal surfaces is

A. monochromatic B. diffracted C. unpolarized D. partially polarized in the horizontal plane E. circularly polarized

1223. The colours of a soap bubble are produced by

A. dispersion B. polarization by reflection C. interference in a thin film D. total internal reflection E. scattering of light

1224. The overall magnification of a compound microscope is

A. independent of the eyepiece B. the product of the objective and eyepiece magnifications C. equal to the eyepiece magnification D. the ratio of the two magnifications E. the sum of the objective and eyepiece magnifications

1225. The power of a lens of focal length 50 cm is

A. 2 dioptre B. 50 dioptre C. 0.5 dioptre D. 0.02 dioptre E. 5 dioptre

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