The sentence “Brass is an element in the periodic table” is a logical statement.
Indicate whether the statement is true or false
Answer: True
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The corrective lenses of a person suffering from which vision ailment could be used to start a fire?
A. Myopia B. no eyeglass lenses can be used to make a fire. C. astigmatism D. hyperopia E. cataracts
A lunar eclipse that occurs when the Moon moves completely into Earth's umbral shadow is called a _____
A) total solar eclipse B) penumbral lunar eclipse C) partial solar eclipse D) total lunar eclipse
An initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of +15 µC carefully placed at the center of the sphere through a hole in the latter's surface. What charge resides inner surface of the sphere?
a. –2 000 µC b. –15 µC c. +15 µC d. zero e. +2 000
Which of the following statements about light focusing is not true?
A) In a healthy eye, light is focused on the retina. B) Film should be placed at the focal plane in a camera. C) If you try to look at an image that is not formed at the focal plane, it will be blurry. D) The focal plane of a reflecting telescope is always located within a few inches of the primary mirror. E) Light can be focused with a lens or a mirror.