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Showing 1851 to 1875 of 3046 questions (page 75 of 122).

1851. The angular frequency of an oscillation of frequency f is

A. pi f B. 2 pi f C. f/2 pi D. f2 E. 1/f

1852. A simple pendulum of length 1 m has a time period of about

A. 6.3 s B. 1.4 s C. 1.0 s D. 3.1 s E. 2.0 s

1853. Oscillations of a system driven by an external periodic force are called

A. stationary oscillations B. damped oscillations only C. forced oscillations D. transverse oscillations E. free oscillations

1854. At a node in a stationary wave, the displacement is

A. increasing steadily B. zero at all times C. maximum D. equal to the wavelength E. half the amplitude

1855. Sound travels fastest in

A. hydrogen B. vacuum C. water D. air E. steel

1856. The audible frequency range for a normal human ear is about

A. 2 Hz to 200 Hz B. 200 Hz to 200 kHz C. 20 kHz to 200 kHz D. 20 Hz to 20 kHz E. 1 Hz to 1 kHz

1857. Ultrasonic waves are used in medical imaging mainly because they

A. cannot be reflected B. travel faster than light C. have short wavelengths giving good resolution D. are ionizing E. are audible

1858. Light from distant galaxies is shifted towards longer wavelengths, which indicates that they are

A. emitting sound B. stationary C. hotter than the Sun D. receding from us E. approaching us

1859. A tuning fork of frequency 320 Hz gives 4 beats per second with a second fork. The possible frequencies of the second fork are

A. 318 or 322 Hz B. 4 or 640 Hz C. 312 or 328 Hz D. 160 or 640 Hz E. 316 or 324 Hz

1860. Bright fringes in a two slit pattern occur where the path difference is

A. (n + 1/2) lambda B. n lambda C. 2 lambda only D. lambda/4 E. zero only

1861. Two coherent sources are most easily obtained in the laboratory by

A. dividing light from a single source B. using sunlight directly C. using two different lasers D. using two different colours E. using two separate lamps

1862. Polaroid sunglasses reduce glare because reflected light from horizontal surfaces is

A. monochromatic B. unpolarized C. diffracted D. partially polarized in the horizontal plane E. circularly polarized

1863. The colours of a soap bubble are produced by

A. polarization by reflection B. total internal reflection C. interference in a thin film D. dispersion E. scattering of light

1864. The overall magnification of a compound microscope is

A. the ratio of the two magnifications B. the product of the objective and eyepiece magnifications C. equal to the eyepiece magnification D. the sum of the objective and eyepiece magnifications E. independent of the eyepiece

1865. The power of a lens of focal length 50 cm is

A. 2 dioptre B. 50 dioptre C. 0.5 dioptre D. 5 dioptre E. 0.02 dioptre

1866. Astigmatism is corrected using a

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

1867. Two bodies in thermal equilibrium with a third body are in thermal equilibrium with each other. This statement is the

A. first law B. zeroth law of thermodynamics C. second law D. third law E. law of heat exchange

1868. The specific heat capacity of a substance is the heat required to raise the temperature of

A. unit mass by 1 K B. unit volume by 1 K C. the whole body by 1 K D. one mole by 1 K E. unit mass by 100 K

1869. The latent heat of fusion of ice is about

A. 4.18 J g-1 B. 33.6 J g-1 C. 336 J g-1 D. 100 J g-1 E. 2260 J g-1

1870. A Carnot engine working between 400 K and 300 K has an efficiency of

A. 30% B. 20% C. 75% D. 33% E. 25%

1871. According to the Kelvin statement of the second law, it is impossible to construct an engine that

A. has an efficiency of 50 per cent B. converts all the heat absorbed from a single reservoir into work C. rejects heat to a sink D. uses a gas as working substance E. operates in a cycle

1872. Electric charge exists only in integral multiples of the electronic charge. This is called

A. conservation of charge B. Gauss's law C. the superposition principle D. quantization of charge E. Coulomb's law

1873. Two electric field lines can never intersect because

A. charges repel B. the field would have two directions at one point C. the lines are imaginary D. the field is conservative E. the field would be zero there

1874. The force between two charges of 1 coulomb each placed 1 metre apart in vacuum is

A. 1 N B. 9 x 10^-9 N C. 9 x 10^9 N D. 8.85 x 10^-12 N E. 1.6 x 10^-19 N

1875. For capacitors connected in series, the quantity that is the same on each is the

A. potential difference B. capacitance C. dielectric constant D. stored energy E. charge

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