Physics Question Answer

Q46. Which one is the unit of surface tension of a liquid
(a) newton /m²
(b) electron volt /cm²
(c) joule/ mm
(d) None of the above

Q47. Sound travels fastest in
(a) Air
(b) Water
(c) Steel
(d) Vacuum

Q48. Light year is a unit of
(a) Distance
(b) Speed
(c) Light
(d) Time

Q49. What is the unit of Magnetic Induction
(a) Ohm
(b) Farad
(c) Volt
(d) Henry

Q50. The speed of sound in air depends on
(a) Frequency
(b) Temperature
(c) Wavelength
(d) None of the Above

Q51. Eddy current is generated by
(a) Conduction
(b) Induction
(c) Convection
(d) Direct Current

Q52. The value of coefficient of restitution in perfectly elastic collision
(a) 0
(b) 0.5
(c) 1
(d) 2

Q53. Energy per unit volume is dimensionally equal to
(a) Pressure
(b) Force
(c) Density
(d) Work

Q54. A body falling through a liquid acquires a steady velocity is known as
(a) End velocity
(b) Touch down velocity
(c) Terminal velocity
(d) Steady state velocity

Q55. Thermal expansion of materials arises from
(a) Strong bonds
(b) Thermal vibrations
(c) Weak bonds
(d) Asymmetry of potential energy curve

Q56. In quantum mechanics a particle is represented by a
(a) Wave
(b) Wave packet
(c) Particle
(d) None of the above

Q57. In a optical fibre cable, the signal is propagated along the
(a) Inner Core
(b) Cladding
(c) Both core and cladding
(d) Surface and cladding

Q58. Thermocouple consists of
(a) Two dissimilar metals
(b) Two similar metals
(c) Metal and a semiconductor
(d) Metal and an insulator

Q59. In superconductors, the energy gap is due to
(a) Electron-electron interaction
(b) Electron-phonon interaction
(c) Phonon-phonon interaction
(d) Electron-photon intercation

Q60. Universal gates are
(a) AND and OR
(b) OR and NOT
(c) NAND and NOR
(d) AND and XOR

___________________________________________________________________________