Physics

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Showing 1426 to 1450 of 1648 questions (page 58 of 66).

1426. The moment of inertia of a thin circular hoop of mass M and radius R about its central axis is

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

1427. The orbital speed of a satellite at distance r from the centre of the Earth is

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

1428. A body moving in a circle with increasing speed has

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

1429. A hydraulic press works on the principle stated by

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

1430. The upthrust on a body immersed in a fluid equals the weight of

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

1431. The viscosity of a liquid, as the temperature rises,

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

1432. In a horizontal pipe of varying cross section, the pressure is lowest where the

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

1433. A body falling through a viscous fluid attains terminal velocity when

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

1434. The angular frequency of an oscillation of frequency f is

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

1435. A simple pendulum of length 1 m has a time period of about

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

1436. Oscillations of a system driven by an external periodic force are called

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

1437. At a node in a stationary wave, the displacement is

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

1438. Sound travels fastest in

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

1439. 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

1440. Ultrasonic waves are used in medical imaging mainly because they

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

1441. Light from distant galaxies is shifted towards longer wavelengths, which indicates that they are

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

1442. 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. 312 or 328 Hz B. 160 or 640 Hz C. 4 or 640 Hz D. 318 or 322 Hz E. 316 or 324 Hz

1443. 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

1444. Two coherent sources are most easily obtained in the laboratory by

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

1445. Polaroid sunglasses reduce glare because reflected light from horizontal surfaces is

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

1446. The colours of a soap bubble are produced by

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

1447. The overall magnification of a compound microscope is

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

1448. The power of a lens of focal length 50 cm is

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

1449. Astigmatism is corrected using a

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

1450. Two bodies in thermal equilibrium with a third body are in thermal equilibrium with each other. This statement is the

A. law of heat exchange B. zeroth law of thermodynamics C. first law D. third law E. second law

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