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1 Sample Mid-Term 3 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) If you double the frequency of a vibrating object, its period A) is quartered. B) doubles. C) halves. 2) Stored potatoes, beets, and rutabagas freeze at temperatures below zero degrees Celsius (rather than at exactly zero) because A) They are good radiators of energy. B) The water in them contains dissolved salts and sugars. C) They are very dense. D) They are good absorbers of radiant energy. E) All of the the above choices are true. 3) Evaporation is a cooling process and condensation is A) a cooling process also. B) a warming process. C) neither a warming nor cooling process. 4) Melting snow A) warms the surrounding air. B) cools the surrounding air. C) neither warms nor cools the surrounding air. 5) The cooling effect inside a refrigerator is produced by A) proper insulation. B) compressing the refrigeration gas into a liquid. C) an electric motor that converts electrical energy into internal energy. D) vaporizing the refrigeration liquid. E) replacing the warmer air with colder air. 6) Suppose you are served coffee at a restaurant before you are ready to drink it. In order for it to be the hottest when you are ready for it, you should add cream A) right away. B) at any time. C) when you are ready to drink the coffee. 7) When a volume of air is compressed, its temperature A) increases. B) decreases. C) neither increases nor decreases. 1) 2) 3) 4) 5) 6) 7) 1

2 8) At the same temperature, which move with the greater speed in the air? A) heavier molecules B) very light molecules C) All will have equal average speeds. 9) Double the absolute temperature of helium gas and the average speed of its molecules A) more than doubles. B) doubles. C) less than doubles. 8) 9) Figure 15-B 10) Consider a metal ring with a gap cut in it. When the ring is heated, the gap A) becomes wider. B) becomes narrower. C) retains its size. 11) We feel uncomfortably warm on a muggy day because water molecules are A) evaporating from our moist bodies. B) condensing on our bodies. C) evaporating and condensing on our bodies at the same rate. 12) When water at 4 degrees C is heated it expands. When water at 4 degrees C is cooled, it A) expands. B) contracts. C) neither contracts nor expands. 13) Which of the following contracts most when the temperature is increased? Equal volumes of A) wood. B) ice water. C) helium. D) iron. E) None of these contract when heated. 14) During a very cold winter, water pipes sometimes burst. The reason for this is A) water expands when freezing. B) the thawing process releases pressure on the pipes. C) water contracts when freezing. D) the ground contracts when colder, pulling pipes apart. E) none of these 10) 11) 12) 13) 14) 2

3 15) When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is A) copper expands more than iron. B) iron expands more than copper. C) copper gets hotter before iron. D) iron gets hotter before copper. E) none of these 16) To turn ice at zero degrees Celsius to water at zero degrees Celsius, we must add A) energy. B) temperature. C) time. D) force. E) It can't be done π water is always warmer than that. 17) The planet Earth loses heat mainly by A) convection. B) conduction. C) radiation. D) all of these 18) The Doppler effect is characteristic of A) light waves. B) water waves. C) sound waves. D) all of the above choices E) none of the above choices 19) Wrapping a hot potato in aluminum foil significantly reduces the rate at which it loses energy by A) convection. B) radiation. C) conduction. 20) Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will be A) the white surface. B) the black surface. C) neitherπthere is no difference. 21) If you were caught in freezing weather with only a candle for heat, you would be warmer in A) a tent. B) a car. C) an igloo. D) a wooden house. 22) Which of the following contracts most when the temperature is decreased? Equal volumes of A) water. B) wood. C) helium. D) iron. E) All contract the same. 15) 16) 17) 18) 19) 20) 21) 22) 3

4 23) When a solid is changed to a liquid state, the solid A) releases energy. B) absorbs energy. C) neither releases nor absorbs energy. D) both releases and absorbs energy. 24) Both black and white road surfaces radiate energy. At the end of a starry night the warmer road surface will be A) the black surface. B) the white surface. C) neitherπthere is no difference. 25) If the specific heat of water were lower than it is, ponds in the cold of winter would be A) more likely to freeze. B) less likely to freeze. C) neither more nor less likely to freeze. 26) Suppose you walk on red-hot coals with bare feet. If bits of the coals do not stick to your feet, it would be best if your feet are A) dry. B) warm. C) cold. D) wet. E) very hot. 27) As a source of continuous sound approaches a constant speed, you will be aware of an apparent increasing of its A) frequency and wavelength. B) loudness and wavelength. C) loudness, frequency, and wavelength. D) loudness and frequency. E) None of the above choices are correct. 28) When we enlarge a photograph of an iron ring, the image of the hole becomes A) larger. B) smaller. C) neither smaller nor larger. 29) If a volume of air is warmed, it expands. If a volume of air expands, it A) warms. B) cools. C) neither warms nor cools. 23) 24) 25) 26) 27) 28) 29) 4

5 Figure 16-A 30) A water-filled paper cup held in a flame will not catch fire. This is because A) the inside of the paper is wet. B) paper is a poor conductor of heat. C) water is an excellent conductor of heat. D) the paper cup cannot become appreciably hotter than the water it contains. 31) The frequency of a note one octave higher in pitch than a 440-Hz note is A) 1760 Hz. B) 110 Hz. C) 440 Hz. D) 220 Hz. E) 880 Hz. 32) The fact that desert sand is very hot in the day and very cold at night is evidence that sand has A) no specific heat. B) a high specific heat. C) a low specific heat. 33) The loudness of a sound is most closely related to its A) intensity. B) speed. C) wavelength. D) frequency. 34) If glass expanded more than mercury, then the column of mercury in a mercury thermometer would rise when the temperature A) increases. B) decreases. C) neither of these 35) Some of a wave's energy dissipates as heat. In time, this will reduce the wave's A) period. B) wavelength. C) frequency. D) speed. E) amplitude. 36) The sound signal is captured in a laser disc by reflective pits that A) are covered with clear plastic. B) are impervious to surface scratches. C) generate the "ones" and "zeros" of the binary code. D) All of the the above choices are correct. E) None of the above choices are correct. 30) 31) 32) 33) 34) 35) 36) 5

6 37) Between 0 degrees Celsius and 8 degrees Celsius a red-dyed-water-in-glass thermometer would A) implode. B) give ambiguous readings. C) explode. D) always be wrong. E) be especially suitable. 38) If the frequency of a certain wave is 10 hertz, its period is A) 100 seconds. B) 10 seconds. C) 0.1 second. D) None of the above choices are correct. 39) Wave interference occurs for A) sound waves. B) water waves. C) light waves. D) All of the above choices are correct. E) None of the above choices are correct. 40) During a single period, the distance traveled by a wave is A) one-half wavelength. B) two wavelengths. C) one wavelength. 37) 38) 39) 40) 6

7 Answer Key Testname: SAMPLE MIDTERM 3 1) C 2) B 3) B 4) B 5) D 6) A 7) A 8) B 9) C 10) A 11) C 12) A 13) B 14) A 15) A 16) A 17) C 18) D 19) B 20) B 21) C 22) C 23) B 24) B 25) A 26) D 27) E 28) A 29) B 30) D 31) E 32) C 33) A 34) B 35) E 36) D 37) B 38) C 39) D 40) C 7

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