Physics

Free set

Showing 1001 to 1025 of 1648 questions (page 41 of 66).

1001. The escape velocity from a planet is independent of

A. the mass of the escaping body B. the radius of the planet C. the mass of the planet D. the gravitational constant E. the value of g at the surface

1002. One watt is equal to

A. one joule B. one joule per second C. one newton metre D. one joule second E. one newton per second

1003. The elastic potential energy stored in a spring of spring constant k compressed by x is

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

1004. The SI unit of angular acceleration is

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

1005. An ice skater spinning with arms outstretched pulls the arms inwards. The angular velocity

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

1006. The moment of inertia of a thin circular hoop of mass M and radius R about its central axis is

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

1007. The orbital speed of a satellite at distance r from the centre of the Earth is

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

1008. A body moving in a circle with increasing speed has

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

1009. A hydraulic press works on the principle stated by

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

1010. The upthrust on a body immersed in a fluid equals the weight of

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

1011. The viscosity of a liquid, as the temperature rises,

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

1012. In a horizontal pipe of varying cross section, the pressure is lowest where the

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

1013. 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 upthrust exceeds the weight D. the acceleration is maximum E. the drag force becomes zero

1014. The angular frequency of an oscillation of frequency f is

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

1015. A simple pendulum of length 1 m has a time period of about

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

1016. Oscillations of a system driven by an external periodic force are called

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

1017. At a node in a stationary wave, the displacement is

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

1018. Sound travels fastest in

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

1019. The audible frequency range for a normal human ear is about

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

1020. Ultrasonic waves are used in medical imaging mainly because they

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

1021. 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

1022. 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. 4 or 640 Hz C. 312 or 328 Hz D. 160 or 640 Hz E. 316 or 324 Hz

1023. Bright fringes in a two slit pattern occur where the path difference is

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

1024. Two coherent sources are most easily obtained in the laboratory by

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

1025. Polaroid sunglasses reduce glare because reflected light from horizontal surfaces is

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

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