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Showing 1651 to 1675 of 3046 questions (page 67 of 122).

1651. A closed organ pipe produces

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

1652. The fundamental frequency of a closed organ pipe of length L is

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

1653. When a source of sound approaches a stationary observer, the observed frequency

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

1654. The speed of a transverse wave on a stretched string of tension F and mass per unit length mu is

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

1655. The intensity level of sound is measured in decibels on a scale that is

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

1656. Dark fringes in a two slit interference pattern occur where the path difference is

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

1657. The colours seen in a thin film of oil on water are due to

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

1658. A wavefront is a surface on which all points have

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

1659. According to Huygens' principle, each point on a wavefront acts as

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

1660. 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

1661. The angular magnification of an astronomical telescope in normal adjustment is

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

1662. The defect of vision in which a person cannot see distant objects clearly is corrected using

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

1663. An endoscope used in medicine works on the principle of

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

1664. The value of the Boltzmann constant is about

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

1665. The work done by a gas expanding at constant pressure is

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

1666. In an isochoric process, the work done by the gas is

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

1667. The triple point of water is

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

1668. 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. the first law forbids it D. the working substance has mass E. friction is unavoidable in practice only

1669. 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

1670. The electric potential at distance r from a point charge q is

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

1671. One electron volt is equal to

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

1672. The charge stored on a 2 microfarad capacitor charged to 100 V is

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

1673. Three capacitors of 2 microfarad each are connected in parallel. The equivalent capacitance is

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

1674. The electric field between two large parallel plates carrying equal and opposite charges is

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

1675. The work done in moving a charge along an equipotential surface is

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

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