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Showing 301 to 325 of 1648 questions (page 13 of 66).

301. If the momentum of a body is doubled, its kinetic energy becomes

A. unchanged B. double C. four times D. half E. eight times

302. Which of the following is a non-conservative force?

A. gravitational force B. electrostatic force C. elastic spring force D. friction E. magnetic force on a static charge

303. A machine takes in 500 J and delivers 400 J of useful output. Its efficiency is

A. 20% B. 60% C. 80% D. 125% E. 40%

304. The angular displacement in one complete revolution is

A. pi radians B. 2 pi radians C. pi/2 radians D. 4 pi radians E. 1 radian

305. A wheel rotating at 300 revolutions per minute has an angular speed of about

A. 5 rad s-1 B. 31.4 rad s-1 C. 300 rad s-1 D. 18.8 rad s-1 E. 62.8 rad s-1

306. The centripetal force on a 2 kg body moving at 4 m s-1 in a circle of radius 2 m is

A. 4 N B. 8 N C. 16 N D. 32 N E. 2 N

307. The rotational kinetic energy of a rigid body is

A. I omega B. (1/2)I omega C. (1/2)I omega2 D. I omega2 E. (1/2)m v omega

308. The rotational analogue of Newton's second law is

A. F = ma B. tau = I alpha C. L = I omega D. p = mv E. tau = r x F

309. An astronaut in an orbiting spacecraft feels weightless because

A. gravity is absent at that altitude B. the spacecraft and astronaut have the same centripetal acceleration C. the mass of the astronaut becomes zero D. air resistance balances gravity E. the spacecraft is not accelerating

310. Artificial gravity in a rotating space station is produced by

A. magnetic fields B. the centripetal acceleration of rotation C. increasing the mass of the station D. reducing the orbital radius E. electrostatic attraction

311. According to Stokes' law, the drag force on a sphere of radius r moving with speed v through a fluid of viscosity eta is

A. 6 pi eta r v B. 4 pi eta r v C. 6 pi eta r2 v D. (1/6) pi eta r v E. 6 pi eta v / r

312. The gauge pressure at a depth of 10 m in water is about

A. 9.8 x 10^2 Pa B. 9.8 x 10^3 Pa C. 9.8 x 10^4 Pa D. 9.8 x 10^5 Pa E. 1.0 x 10^2 Pa

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

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

314. The SI unit of surface tension is

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

315. A liquid rises in a capillary tube because of

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

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

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

317. Resonance occurs when the frequency of the driving force

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

318. 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

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

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

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

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

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

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

322. Sound waves in air are

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

323. A closed organ pipe produces

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

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

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

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

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

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