front 1 Water pressure is greatest against the a. bottom of a submerged object b. is the same against all surfaces c. top of a submerged object d. sides of a submerged object e. none of these | back 1 bottom of a submerged object |
front 2 A dam is thicker at the bottom than at the top partly because a. it looks better b. surface tension exists only at the surface of liquids c. water pressure is greater with increasing depth d. water is denser at deeper levels e. none of these | back 2 water pressure is greater with increasing depth |
front 3 The pressure at the bottom of a jug filled with water does NOT depend on a. water density b. the height of the liquid c. surface area of the water d. the acceleration due to gravity e. none of these | back 3 surface area of the water |
front 4 A completely submerged object always displaces its own a. weight of fluid b. density of fluid c. volume of fluid d. all of these e. none of these | back 4 volume of fluid |
front 5 What is the buoyant force acting on a 10-ton ship floating in the ocean? a. more than 10 tons b. 10 tons c. depends on density of sea water d. less than 10 tons | back 5 10 tons |
front 6 What is the weight of water displace by a 100 ton floating ship a. 100 tons b. depends on the ship's shape c. more than 100 tons d. less than 100 tons e. 100 cubic meters | back 6 100 tons |
front 7 The buoyant force on an object is least when the object is a. submerged near the bottom b. partly submerged c. submerged near the surface d. none of these | back 7 partly submerged |
front 8 When an object is partly or wholly immersed in a liquid, it is buoyed up a. by a force equal to its own weight b. and floats because of Archimedes principle c. but nevertheless sinks d. by a force equal to the weight of liquid displace e. none of these | back 8 by a force equal to the weight of liquid displaced |
front 9 Two life preservers have identical volume, but one is filled with Styrofoam while the other is filled with sand. When the two life preservers are fully submerged, the buoyant force is greater on the one filled with a. sand b. Styrofoam c. same on each as long as their volumes are the same | back 9 same on each as long as their volumes are the same |
front 10 Compared to an empty ship, the same ship loaded with Styrofoam will float a. at the same level in the water b. higher in the water c. lower in the water | back 10 lower in the water |
front 11 Two equal sized buckets are filled to the top with water. One of the buckets has a piece of wood floating in it, making its total weight a. less than the weight of the other bucket b. more than the weight of other bucket c. equal to the weight of the other bucket | back 11 equal to the weight of the other bucket |
front 12 Compared to the buoyant force that acts on you when you float in fresh water, the buoyant force that acts on you when you float in the dense water of the Dead Sea is a. more, because of the greater density of fluid displaced b. less, because less of your volume is displaced c. the same | back 12 the same |
front 13 A rock suspended by a string weighs 5N out of water and 3N when submerged. What is the buoyant force on the rock? a. 3N b. 2N c. 8N d. 5N e. none of these | back 13 2N |
front 14 In a hydraulic-press operation, it is impossible for the a. force output to exceed the force input b. output piston's speed to exceed the input piston's speed c. output displacement to exceed the input displacement d. energy output to exceed the energy input e. none of these | back 14 energy output to exceed the energy input |
front 15 The ration of output force to input force of a hydraulic press will be equal to the ratio of the output and input piston a. diameters b. radii c. areas d. all of these e. none of these | back 15 areas |
front 16 To multiply the input force of a hydraulic lift, the input end should be the one having the a. smaller diameter piston b. larger diameter piston c. Relative piston sizes don't matter | back 16 ??? |
front 17 Substances absorb heat energy by the process of a. convection b. conduction c. radiation d. all of these | back 17 all of these |
front 18 A good heat conductor is a. a poor insulator b. a good insulator c. neither a poor nor a good insulator | back 18 a poor insulator |
front 19 Your feet fell warmer on a rug than on a tile floor because a rug a. is a better insulator than tile b. for the same mass has more internal energy than tile c. is usually warmer than tile d. all of these e. none of these | back 19 is a better insulator than tile |
front 20 Warm air rises because faster-moving molecules ten to move to regions of less a. pressure b. density and less pressure c. density | back 20 density and less pressure |
front 21 Objects that radiate relatively well a. reflect radiation relatively well b. absorb radiation relatively well c. both of these d. neither of these | back 21 absorb radiation relatively well |
front 22 A liter of hot water will cool to room temperature faster in a a. red pot b. silver pot c. black pot d. depends on the size of the pot than its color | back 22 black pot |
front 23 Cold water will warm to room temperature faster in a a. silver pot b. black pot c. depends more on the size of the pots than their color | back 23 black pot |
front 24 Which body glows with electromagnetic waves? a. only the Earth b. neither the Sun or the Earth c. only the Sun d. both the Sun and the Earth | back 24 both the Sun and the Earth |
front 25 The planet Earth loses heat mainly by a. radiation b. conduction c. convection d. all of these | back 25 radiation |
front 26 If air were a better conductor than it is, at nighttime the Earth would be a. considerable warmer b. not appreciably different in temperature c. considerable cooler | back 26 considerably cooler |
front 27 A water-filled paper cup held in a flame will not catch fire. This is because a. paper is a poor conductor of heat b. inside the paper is wet c. water is an excellent conductor of heat d. the paper cup cannot become appreciable hotter than the water it contains | back 27 the paper cup cannot become appreciably hotter than the water it contains |
front 28 One of the main reasons one can walk barefoot on red-hot coals of wood without burning the feet has to do with a. low thermal conductivity of the coals b. mind over matter techniques c. low temperature of the coals | back 28 low thermal conductivity of the coals |
front 29 Hydrogen and oxygen molecules in a gas sample have the same temperature. This means the hydrogen molecules, on the average, have the same a. speed, but less kinetic energy b. kinetic energy, but less speed c. speed, but more kinetic energy d. kinetic energy, but more speed e. speed and the same kinetic energy | back 29 kinetic energy, but more speed |
front 30 A wiggle in time is a a. wave b. vibration c. both d. neither | back 30 vibration |
front 31 Like a transverse wave, a longitudinal wave has a. amplitude, frequency and speed b. wavelength, speed and frequency c. amplitude, frequency, wavelength and speed d. amplitude, wavelength and speed e. amplitude, frequency and wavelength | back 31 amplitude, frequency, wavelength and speed |
front 32 In a longitudinal wave the compression and rarefactions travel in a. a vacuum b. the same direction c. opposite directions | back 32 the same direction |
front 33 Which of the following is not a transverse wave? a. radio b. sound c. light d. all of these e. none of these | back 33 sound |
front 34 How many vibrations per second are associated with a 101 MHz radio wave a. 101,000,000 b. more than 101,000,000 c. less than 101,000,000 | back 34 101,000,000 |
front 35 Radio waves travel at the speed of light, 300,000 km/s. The wavelength of a radio wave received at 100 megahertz is a. 300m b. 0.3m c. 30m d. 3.0m e. none of these | back 35 3.0m |
front 36 The frequency of a simple pendulum depends on a. the acceleration due to gravity b. its length c. its mass d. all of these e. two of these | back 36 two of these |
front 37 If the frequency of a certain wave is 10 hertz, its period is a. 10 seconds b. 0.1 second c. 100 seconds d. none of the above choices are correct | back 37 0.1 second |
front 38 Wave interference occurs for a. water waves b. light waves c. sound waves d. all of the above choices are correct e. none of the above choices are correct | back 38 all of the above choices are correct |
front 39 A node is a position of a. maximum amplitude b. half amplitude c. minimum amplitude | back 39 minimum amplitude |
front 40 The Doppler effect is characteristic of a. sound waves b. light waves c. water waves d. all of the above choices e. none of the above choices | back 40 all of the above choices |
front 41 A Doppler effect occurs when a source of sound moves a. towards you b. in a circle around you c. either towards you or away from you d. away from you | back 41 either towards you or away from you |
front 42 If you double the frequency of a vibrating object, its period a. doubles b. is quartered c. halves | back 42 halves |
front 43 A wave travels an average distance of 1 meter in 1 second with a frequency of 1 hertz. Its amplitude is a. 1 meter b. more than 1 meter c. less than 1 meter d. not enough information to say | back 43 not enough information to say |
front 44 During a single period, the distance traveled by a wave is a. one-half wavelength b. two wavelengths c. one wavelength | back 44 one wavelength |
front 45 A weight suspended from a spring bobs up and down over a distance of 1 meter in two seconds. Its frequency is a. 1 hertz b. 0.5 hertz c. 2 hertz d. none of the above choices are correct | back 45 0.5 hertz |