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Showing 276 to 300 of 3046 questions (page 12 of 122).

276. The work done by the centripetal force on a body moving in a circle at constant speed is

A. maximum B. zero C. negative and constant D. equal to the kinetic energy E. equal to the potential energy

277. The escape velocity from the surface of the Earth is approximately

A. 9.8 m s-1 B. 3 x 10^8 m s-1 C. 11.2 km s-1 D. 7.9 km s-1 E. 1.6 km s-1

278. One kilowatt hour is equal to

A. 3.6 x 10^3 J B. 3.6 x 10^5 J C. 3.6 x 10^6 J D. 3.6 x 10^7 J E. 1 x 10^3 J

279. Power delivered by a constant force F to a body moving with velocity v is

A. F/v B. F x v (vector product) C. F . v D. F v2 E. F/v2

280. A body of mass m is dropped from height h. At height h/2 the ratio of its kinetic energy to potential energy (measured from the ground) is

A. 1:2 B. 2:1 C. 1:1 D. 1:4 E. 4:1

281. The work energy principle states that the net work done on a body equals

A. its total energy B. the change in its kinetic energy C. the change in its potential energy D. its momentum E. the power delivered

282. The SI unit of angular momentum is equivalent to

A. N m B. J s C. W s D. N s E. J s-1

283. Centripetal acceleration of a body moving in a circle of radius r with speed v is

A. v/r B. v2/r C. v2r D. r/v2 E. vr

284. For a vehicle taking a banked curve without friction, the banking angle satisfies

A. sin theta = v2/rg B. tan theta = v2/rg C. cos theta = v2/rg D. tan theta = rg/v2 E. tan theta = v/rg

285. The moment of inertia of a uniform disc of mass M and radius R about an axis through its centre and perpendicular to its plane is

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

286. The orbital period of a geostationary satellite is

A. 1 hour B. 12 hours C. 24 hours D. 28 days E. 365 days

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

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

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

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

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

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

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

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

291. A Venturi meter is used to measure

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

292. The SI unit of coefficient of viscosity is

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

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

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

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

295. In simple harmonic motion, the acceleration of the body is

A. constant B. directly proportional to displacement and in the same direction C. directly proportional to displacement and opposite in direction D. inversely proportional to displacement E. zero at the extreme positions

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

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

297. The time period of a mass m attached to a spring of spring constant k is

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

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

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

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

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

300. In SHM, kinetic energy is maximum at

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

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