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Showing 576 to 600 of 1648 questions (page 24 of 66).

576. The speed of a transverse wave on a stretched string of tension F and mass per unit length mu is

A. sqrt(F mu) B. sqrt(F/mu) C. F/mu D. F mu E. mu/F

577. The intensity level of sound is measured in decibels on a scale that is

A. exponential B. inverse square C. logarithmic D. linear E. quadratic

578. Dark fringes in a two slit interference pattern occur where the path difference is

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

579. The colours seen in a thin film of oil on water are due to

A. polarization B. dispersion C. total internal reflection D. interference of light reflected from the two surfaces E. scattering

580. A wavefront is a surface on which all points have

A. zero displacement B. maximum intensity C. the same amplitude D. the same wavelength only E. the same phase

581. According to Huygens' principle, each point on a wavefront acts as

A. a source of secondary spherical wavelets B. a mirror C. a node D. a polarizer E. an absorber

582. In Young's experiment, if the separation between the slits is increased, the fringe spacing

A. increases B. decreases C. doubles D. remains the same E. becomes zero immediately

583. The angular magnification of an astronomical telescope in normal adjustment is

A. fo/fe B. 1 + fo/fe C. fo - fe D. fo x fe E. fe/fo

584. The defect of vision in which a person cannot see distant objects clearly is corrected using

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

585. An endoscope used in medicine works on the principle of

A. polarization B. interference C. dispersion D. diffraction E. total internal reflection through optical fibres

586. The value of the Boltzmann constant is about

A. 1.38 x 10^-23 J K-1 B. 1.6 x 10^-19 J C. 9.1 x 10^-31 J K-1 D. 8.314 J K-1 E. 6.63 x 10^-34 J s

587. The work done by a gas expanding at constant pressure is

A. nRT ln(V2/V1) B. P times the change in volume C. (1/2)P V D. V times the change in pressure E. zero

588. In an isochoric process, the work done by the gas is

A. nRT B. P delta V C. equal to the heat supplied D. negative E. zero

589. The triple point of water is

A. 100 K B. 273.16 K C. 373.15 K D. 0 K E. 273.15 K

590. A heat engine cannot have an efficiency of 100 per cent because

A. some heat must always be rejected to the sink B. fuel is limited C. friction is unavoidable in practice only D. the first law forbids it E. the working substance has mass

591. The force between two charges placed in a medium of relative permittivity 4 compared with that in vacuum becomes

A. unchanged B. half C. twice D. one quarter E. four times

592. The electric potential at distance r from a point charge q is

A. kq r2 B. kqr C. kq/r D. kr/q E. kq/r2

593. One electron volt is equal to

A. 1 J B. 1.6 x 10^-19 J C. 6.63 x 10^-34 J D. 9.1 x 10^-31 J E. 1.6 x 10^19 J

594. The charge stored on a 2 microfarad capacitor charged to 100 V is

A. 2 C B. 2 x 10^-6 C C. 200 C D. 2 x 10^-4 C E. 2 x 10^-2 C

595. Three capacitors of 2 microfarad each are connected in parallel. The equivalent capacitance is

A. 6 microfarad B. 2 microfarad C. 0.67 microfarad D. 4 microfarad E. 8 microfarad

596. The electric field between two large parallel plates carrying equal and opposite charges is

A. proportional to the distance from a plate B. radial C. uniform D. inversely proportional to the separation squared E. zero

597. The work done in moving a charge along an equipotential surface is

A. maximum B. infinite C. equal to qV D. negative E. zero

598. One ampere is equivalent to

A. one joule per coulomb B. one volt per ohm second C. one coulomb per second D. one coulomb per volt E. one watt per volt second

599. The power dissipated when 2 A flows through a 5 ohm resistor is

A. 40 W B. 0.4 W C. 2.5 W D. 10 W E. 20 W

600. The terminal potential difference of a cell is less than its emf when

A. current is drawn from the cell B. the cell is being charged C. the external resistance is infinite D. the internal resistance is zero E. no current flows

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