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Showing 2626 to 2650 of 3046 questions (page 106 of 122).

2626. The viscosity of a liquid, as the temperature rises,

A. stays constant B. decreases C. increases D. first rises then falls E. becomes infinite

2627. In a horizontal pipe of varying cross section, the pressure is lowest where the

A. fluid is at rest B. density is greatest C. cross section is largest D. cross section is smallest E. pipe is highest

2628. A body falling through a viscous fluid attains terminal velocity when

A. the weight equals the sum of upthrust and drag B. the drag force becomes zero C. the fluid becomes turbulent D. the upthrust exceeds the weight E. the acceleration is maximum

2629. The angular frequency of an oscillation of frequency f is

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

2630. A simple pendulum of length 1 m has a time period of about

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

2631. Oscillations of a system driven by an external periodic force are called

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

2632. At a node in a stationary wave, the displacement is

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

2633. Sound travels fastest in

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

2634. The audible frequency range for a normal human ear is about

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

2635. Ultrasonic waves are used in medical imaging mainly because they

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

2636. Light from distant galaxies is shifted towards longer wavelengths, which indicates that they are

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

2637. 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. 312 or 328 Hz B. 160 or 640 Hz C. 4 or 640 Hz D. 318 or 322 Hz E. 316 or 324 Hz

2638. Bright fringes in a two slit pattern occur where the path difference is

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

2639. Two coherent sources are most easily obtained in the laboratory by

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

2640. Polaroid sunglasses reduce glare because reflected light from horizontal surfaces is

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

2641. The colours of a soap bubble are produced by

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

2642. 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

2643. The power of a lens of focal length 50 cm is

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

2644. Astigmatism is corrected using a

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

2645. Two bodies in thermal equilibrium with a third body are in thermal equilibrium with each other. This statement is the

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

2646. The specific heat capacity of a substance is the heat required to raise the temperature of

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

2647. The latent heat of fusion of ice is about

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

2648. A Carnot engine working between 400 K and 300 K has an efficiency of

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

2649. According to the Kelvin statement of the second law, it is impossible to construct an engine that

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

2650. Electric charge exists only in integral multiples of the electronic charge. This is called

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

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