Mixed Practice

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Showing 1001 to 1025 of 3046 questions (page 41 of 122).

1001. The lift on an aeroplane wing arises because the air above the wing moves

A. slower, giving higher pressure above B. only in turbulent flow C. faster, giving lower pressure above D. at the same speed as below E. in the opposite direction

1002. The SI unit of surface tension is

A. N m2 B. N m-1 C. N m-2 D. J m E. N m

1003. A liquid rises in a capillary tube because of

A. surface tension and adhesion B. atmospheric temperature C. turbulence D. viscosity E. its density alone

1004. The potential energy of a body in SHM at displacement x is

A. kx B. kx2 C. (1/2)kx D. (1/2)k/x E. (1/2)kx2

1005. Resonance occurs when the frequency of the driving force

A. is much lower than the natural frequency B. is much higher than the natural frequency C. is zero D. equals the natural frequency of the system E. is doubled

1006. The effect of damping on an oscillating system is to

A. increase the amplitude B. reduce the amplitude progressively C. increase the natural frequency indefinitely D. reverse the phase E. keep the amplitude constant

1007. The time period of a simple pendulum taken to the Moon, where g is about one sixth of its value on Earth, will

A. remain the same B. increase C. become zero D. become infinite E. decrease

1008. The displacement of a body in SHM starting from the mean position is described by

A. x = x0 omega t B. x = omega t C. x = x0 tan(omega t) D. x = x0 cos(omega t) E. x = x0 sin(omega t)

1009. A sound wave of frequency 170 Hz travels at 340 m s-1. Its wavelength is

A. 2 m B. 0.5 m C. 1 m D. 0.2 m E. 4 m

1010. Sound waves in air are

A. electromagnetic B. stationary only C. longitudinal D. polarized E. transverse

1011. A closed organ pipe produces

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

1012. The fundamental frequency of a closed organ pipe of length L is

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

1013. When a source of sound approaches a stationary observer, the observed frequency

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

1014. 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

1015. 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

1016. 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

1017. 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

1018. 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

1019. 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

1020. 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

1021. 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

1022. 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

1023. 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

1024. 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

1025. 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

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