Which of the following is true? The number of daylight hours depends on
a. the International Date Line.
b. the longitude.
c. the latitude.
d. all of these.
c
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A pencil inside a water glass appears to be bent because of
A. reflection of light. B. diffraction of light. C. refraction of light. D. None of these choices are correct.
A galvanometer with a coil resistance of 80 ? deflects full-scale for a current of 2.0 mA. What series resistance is required to convert it to a voltmeter reading full scale for 200 V
A) 100 m? B) 13 M? C) 250 k? D) 0.80 m? E) 100 k?
A tuning fork is set into vibration with a frequency of 512 Hz. How many oscillations does it undergo in 1 minute?
A) 30700 B) 8.53 C) 26.8 D) 1610 E) 512
The hottest star in the Orion Nebula ____________hydrogen gas and makes it _____________
a. ionizes; glow b. neutralizse; glow c. ionizes; swallow the star