EdgineerX

1601. 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

1602. 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

1603. 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

1604. The pitch of a musical note is determined mainly by its

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

1605. 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

1606. In Young's experiment with white light, the central fringe is

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

1607. 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

1608. 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

1609. Hypermetropia, or long sight, is corrected using a

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

1610. The light sensitive layer at the back of the human eye is the

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

1611. 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

1612. The internal energy of an ideal gas depends only on its

A. pressure B. temperature C. density D. volume E. molar mass

1613. Heat flows spontaneously from a body at higher temperature to one at lower temperature. This is a statement of the

A. first law B. third law C. law of conservation of mass D. zeroth law E. second law

1614. The electric field intensity at distance r from a point charge q is

A. k q divided by r B. k divided by q r C. k q divided by r squared D. k q r squared E. k q r

1615. Potential difference between two points is defined as the work done per unit charge in moving a charge

A. to infinity always B. along a field line only C. around a closed loop D. through a conductor only E. between the two points

1616. Millikan's oil drop experiment determined the

A. mass of the proton B. charge on the electron C. Planck constant D. speed of light E. charge to mass ratio of the electron

1617. Conventional current is taken to flow

A. only in semiconductors B. in the direction of electron flow C. opposite to the direction of electron flow D. from low to high potential in the external circuit E. perpendicular to electron flow

1618. Current density in a conductor is defined as the current per unit

A. length B. cross sectional area C. volume D. potential difference E. time

1619. The electromotive force of a cell is the energy supplied per unit charge in driving it

A. through the internal resistance only B. across the terminals at open circuit only C. in the reverse direction D. through the external resistance only E. around the complete circuit

1620. Two identical bulbs are connected first in series and then in parallel across the same supply. They are brighter

A. only if the supply is AC B. equally in both cases C. in parallel D. in series E. only if the supply is DC

1621. A fuse protects a circuit because it is made of a wire with

A. low melting point and suitable resistance so that it melts on excess current B. high melting point and low resistance C. the same rating as the supply D. zero resistance E. infinite resistance

1622. The polarity of the ends of a current carrying solenoid is found using the

A. Lenz law only B. inverse square law C. left hand rule for force D. right hand grip rule E. parallel axis theorem

1623. Relative permeability of a medium is defined as the ratio of its permeability to that of

A. iron B. the sample itself C. water D. air at high pressure E. free space

1624. Magnetic field lines form closed loops, which shows that

A. magnetic fields do no work B. magnetic fields are conservative C. the field has no direction D. magnetic monopoles have not been observed E. the field is always uniform

1625. A charged particle at rest in a magnetic field experiences

A. a torque only B. a force along the field C. no magnetic force D. an accelerating force E. a force perpendicular to the field

Physics