Which of the following best describes the image for a thin, convex lens that forms whenever the object is at a distance less than one focal length from the lens?
a. upright, diminished, and virtual
c. upright, enlarged, and virtual
b. inverted, diminished, and real
d. inverted, enlarged, and real
[Ques. 2] Avogadro's number is related to the universal gas constant R and the number of moles n by:
a. NA = Rn
b. NA = R/n
c. NA = n/R
d. Avogadro's number cannot be related to these two quantities alone.
[Ques. 3] A 4.0-cm tall object is placed along the principal axis of a thin, convex lens of 30.0-cm focal length. If the object distance is 40.0 cm, which of the following best describes the image distance and height, respectively?
a. 17.3 cm and 7.0 cm
c. 120 cm and 1.3 cm
b. 17.3 cm and 1.3 cm
d. 120 cm and 12 cm
[Ques. 4] The value 1.38 10-23 J/K is known as:
a. the universal gas constant.
c. Avogadro's number.
b. Boltzmann's constant.
d. the molar specific.
[Ques. 5] An object is placed a distance d from a converging lens. The object is then moved to a distance 2d from the converging lens. Which of the following statements is false?
a. The image in the second case with the object at distance 2d can be the larger one.
b. If both images are real, the image in the second case is smaller.
c. If the image in the first case is real, the image in the second case is upright.
d. The image in the first case with the object at distance d can be the larger one.
[Ques. 6] Which law is for a quantity of gas held at constant volume?
a. Boyle's law
c. Gay-Lussac's law
b. Charles's law
d. Avogadro's law
[Ques. 7] If an optical system consists only of an object and a single convex mirror,
a. the image will sometimes be inverted. b. the magnification will sometimes have an absolute value greater than 1.
c. the image distance will never be negative.
d. the image will always be virtual.
[Ques. 8] What thermodynamic quantity is held constant in Boyle's law?
a. pressure
b. volume
c. temperature
d. Both pressure and volume are each held constant.
[Ques. 9] An object is placed 10 cm in front of a mirror, and an image is formed that has a magnification of 3 . Which of the following statements is false?
a. The image is upright.
b. The image is virtual.
c. The focal length of the mirror is 15 cm.
d. This is the only true statement.
[Ques. 10] How many molecules are there in 14 grams of nitrogen gas?
a. NA/2
c. 2 NA
b. NA
d. The answer is not given.
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