Physics

Free set

Showing 901 to 925 of 1648 questions (page 37 of 66).

901. The rotational analogue of Newton's second law is

A. L = I omega B. F = ma C. tau = I alpha D. tau = r x F E. p = mv

902. An astronaut in an orbiting spacecraft feels weightless because

A. air resistance balances gravity B. gravity is absent at that altitude C. the spacecraft is not accelerating D. the mass of the astronaut becomes zero E. the spacecraft and astronaut have the same centripetal acceleration

903. Artificial gravity in a rotating space station is produced by

A. the centripetal acceleration of rotation B. reducing the orbital radius C. magnetic fields D. increasing the mass of the station E. electrostatic attraction

904. According to Stokes' law, the drag force on a sphere of radius r moving with speed v through a fluid of viscosity eta is

A. 4 pi eta r v B. (1/6) pi eta r v C. 6 pi eta v / r D. 6 pi eta r v E. 6 pi eta r2 v

905. The gauge pressure at a depth of 10 m in water is about

A. 9.8 x 10^4 Pa B. 9.8 x 10^5 Pa C. 9.8 x 10^2 Pa D. 1.0 x 10^2 Pa E. 9.8 x 10^3 Pa

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

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

907. The SI unit of surface tension is

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

908. A liquid rises in a capillary tube because of

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

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

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

910. Resonance occurs when the frequency of the driving force

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

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

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

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

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

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

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

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

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

915. Sound waves in air are

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

916. A closed organ pipe produces

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

917. 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

918. 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

919. 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

920. 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

921. 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

922. 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

923. 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

924. 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

925. 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

Previous 1 2 … 35 36 37 38 39 … 65 66 Next

Get full access to the MCQ bank

Premium questions, timed mock tests, and detailed explanations.

See premium plans