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Showing 2801 to 2825 of 3046 questions (page 113 of 122).

2801. The time period of a simple pendulum is independent of

A. the square root of the length B. the location on Earth C. its length D. the mass of the bob E. the value of g

2802. When a transverse pulse on a string is reflected from a rigid support, it undergoes a phase change of

A. 90 degrees B. 0 degrees C. 270 degrees D. 360 degrees E. 180 degrees

2803. If the distance from a point source of sound is doubled, the intensity becomes

A. four times B. half C. one quarter D. double E. unchanged

2804. SONAR is used to determine the depth of the sea using

A. ultrasonic waves and their echo time B. radio waves C. visible light D. infrasonic waves only E. gamma rays

2805. The principle of superposition states that where two waves meet, the resultant displacement is

A. the product of the individual displacements B. the algebraic sum of the individual displacements C. the difference of the amplitudes only D. the larger of the two displacements E. always zero

2806. If the tension in a stretched string is made four times, the fundamental frequency becomes

A. unchanged B. four times C. double D. one quarter E. half

2807. Diffraction effects are most noticeable when the size of the obstacle or aperture is

A. much larger than the wavelength B. much smaller than the wavelength in every dimension C. independent of the wavelength D. equal to the amplitude E. comparable to the wavelength

2808. In a diffraction grating with more lines per centimetre, the diffracted orders become

A. identical to interference fringes B. more widely separated C. closer together D. independent of wavelength E. less intense only

2809. A magnifying glass produces an image that is

A. real and inverted B. virtual and diminished C. virtual, erect and magnified D. always at the focus E. real and diminished

2810. A telescope is said to be in normal adjustment when the final image is formed

A. at infinity B. at the focal point of the objective C. at the near point D. at the objective E. on the retina directly

2811. A spectrometer is used to

A. measure current B. magnify small objects C. detect magnetic fields D. measure resistance E. disperse light and measure wavelengths

2812. The entropy of a substance during melting at its melting point

A. decreases B. becomes negative C. becomes zero D. increases E. remains constant

2813. A diesel engine is generally more efficient than a petrol engine because it operates with a

A. spark plug B. higher compression ratio C. lower compression ratio D. richer fuel mixture E. lower peak temperature

2814. An ideal gas is compressed adiabatically. Its temperature

A. becomes zero B. stays constant C. falls D. first rises then falls E. rises

2815. Heat supplied to a gas at constant pressure is used to

A. increase the internal energy and do external work B. increase the pressure only C. do external work only D. lower the temperature E. increase the internal energy only

2816. The electric flux through a surface of area A held at angle theta to a uniform field E is

A. EA B. EA sin theta C. EA tan theta D. E/A cos theta E. EA cos theta

2817. Charge on an irregularly shaped conductor accumulates most densely

A. inside the conductor B. uniformly everywhere C. at sharply curved regions and points D. at flat regions E. at the centre of mass

2818. The potential energy of two point charges q1 and q2 separated by r is

A. zero B. k q1 q2 divided by r C. k q1 divided by q2 r D. k q1 q2 divided by r squared E. k q1 q2 times r

2819. In a cathode ray tube, electrons are produced by

A. radioactive decay B. field ionization of the gas C. photoelectric emission from the anode D. secondary emission at the screen E. thermionic emission from a heated filament

2820. A 100 W bulb operated for 10 hours consumes

A. 0.1 kWh B. 1 kWh C. 100 kWh D. 1000 kWh E. 10 kWh

2821. The resistance of a metallic conductor at temperature t is related to its resistance at 0 degrees Celsius by

A. R = R0 alpha t B. R = R0 (1 - alpha t) C. R = R0 (1 + alpha t) D. R = alpha t E. R = R0 divided by alpha t

2822. A cell of emf 2 V and internal resistance 0.5 ohm delivers current to a 1.5 ohm external resistor. The current is

A. 1 A B. 2 A C. 1.33 A D. 4 A E. 0.5 A

2823. Kirchhoff's second rule is based on the conservation of

A. flux B. mass C. charge D. momentum E. energy

2824. Magnetic flux density is defined as the

A. force per unit charge B. flux per unit area perpendicular to the field C. current per unit area D. flux times area E. flux per unit length

2825. A mass spectrometer separates ions according to their

A. speed only B. colour C. mass to charge ratio D. temperature E. chemical reactivity

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