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Showing 2926 to 2950 of 3046 questions (page 118 of 122).

2926. The gravitational field strength at the surface of a planet of mass M and radius R is

A. GM squared divided by R B. GM divided by R C. R squared divided by GM D. GM divided by R squared E. GMR

2927. A photovoltaic cell converts

A. light directly into electricity B. chemical energy into heat C. mechanical energy into electricity D. heat directly into electricity E. electricity into light

2928. Tidal energy is ultimately derived from

A. nuclear decay in the crust B. wind over the sea C. the gravitational interaction of the Moon and Sun with the oceans D. the Earth's internal heat E. fossil fuels

2929. The angular momentum of a particle of mass m moving with speed v in a circle of radius r is

A. v r divided by m B. mvr C. mv divided by r D. m r squared divided by v E. mv squared r

2930. Torque is a

A. form of energy B. dimensionless quantity C. vector quantity D. unit vector E. scalar quantity

2931. If the radius of a satellite's orbit is increased, its orbital speed

A. becomes zero B. remains unchanged C. doubles D. increases E. decreases

2932. A spinning cricket ball swings in flight because the spin makes the air move

A. at the same speed on both sides B. without viscosity C. in a vacuum D. only along the seam E. faster on one side, lowering the pressure there

2933. A perfume atomizer works because a fast air stream across a tube produces

A. a fall in pressure that draws liquid up the tube B. turbulence in the liquid only C. an electric charge D. a rise in pressure at the nozzle E. a rise in temperature

2934. In Bernoulli's equation, the term rho g h represents

A. kinetic energy per unit volume B. potential energy per unit volume C. the surface energy D. pressure energy per unit volume E. the viscous loss

2935. A small liquid drop is spherical because a sphere has

A. no surface energy B. the greatest density C. zero surface tension D. the smallest surface area for a given volume E. the largest surface area for a given volume

2936. The maximum displacement of a body from its mean position in SHM is called the

A. frequency B. wavelength C. amplitude D. phase E. time period

2937. At the extreme position in SHM, the energy of the body is

A. half kinetic and half potential B. zero C. entirely kinetic D. maximum kinetic and maximum potential together E. entirely potential

2938. The quantity that specifies the state and direction of motion of an oscillating body at a given instant is its

A. time period B. frequency C. spring constant D. phase E. amplitude

2939. Marching soldiers are ordered to break step while crossing a suspension bridge in order to avoid

A. polarization B. damping C. resonance D. diffraction E. interference

2940. The frequency of the nth harmonic of a stretched string is

A. the fundamental frequency divided by n B. n times the fundamental frequency C. half the fundamental D. n squared times the fundamental E. independent of n

2941. The persistence of sound in a hall after the source has stopped is called

A. interference B. resonance C. reverberation D. a beat E. an echo

2942. The characteristic of a musical note that distinguishes a violin from a flute playing the same note is its

A. quality or timbre B. wavelength C. loudness D. pitch E. speed

2943. The pitch of a musical note is determined mainly by its

A. speed B. frequency C. intensity D. amplitude E. waveform

2944. An observer moving towards a stationary source of sound hears a frequency that is

A. lower than the emitted frequency B. zero C. the same as the emitted frequency D. doubled exactly E. higher than the emitted frequency

2945. In Young's experiment with white light, the central fringe is

A. black B. violet C. red D. white E. green

2946. Using red light instead of blue light in a two slit experiment makes the fringes

A. wider B. brighter but unchanged in spacing C. curved D. disappear E. narrower

2947. The ability of certain substances to rotate the plane of polarization of light is called

A. diffraction B. optical activity C. dichroism D. birefringence E. dispersion

2948. Hypermetropia, or long sight, is corrected using a

A. prism B. cylindrical lens C. concave lens D. plane lens E. convex lens

2949. The light sensitive layer at the back of the human eye is the

A. lens B. sclera C. retina D. cornea E. iris

2950. The Carnot cycle consists of

A. two isothermal and two adiabatic processes B. four isothermal processes C. four adiabatic processes D. two isobaric and two isochoric processes E. one isothermal and three adiabatic processes

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