Answers to Physics Concept Questions (Test #3)

This page provides answers to Physics Concept Questions – Test #3.
The test contains 30 multiple choice questions.
The correct answers are bolded below.

You submerge a gallon jug in your swimming pool. Where is the water pressure the greatest?
1. left side of the jug
2. right side of the jug
3. top of the jug
4. middle of the jug
5. bottom of the jug
6. all of the above
7. none of the above
You have a sheet of rolled out dough. You roll this up into a ball. Doing this reduces its
1. mass
2. momentum
3. volume
4. surface area
5. all of the above
6. none of the above
Fill the compartments of an ice-cube tray half full with iron nails. Top off with water and freeze. Now drop one of these ice cubes in a glass of water. As it melts, the water level in the glass will
1. drop
2. rise
3. stay the same
4. all of the above
An iceberg is partly immersed, as it floats in the ocean. It is buoyed up by
1. leprechauns
2. the gravitational attraction from the moon
3. a force equal to the weight of the iceberg
4. a force less than the weight of the iceberg
5. a force greater than the weight of the iceberg
6. a force equal to twice the weight of the water that is displaced
7. all of the above
8. none of the above
The buoyant force is the smallest on a completely immersed
1. 2 cubic centimeter block of iron
2. 2 cubic centimeter block of aluminum
3. 2 cubic centimeter block of wood
4. the force is the same on all three blocks
5. none of the above
6. not enough info
A Helium filled balloon is released and rises up into the sky. As it moves upward, it
1. becomes heavier
2. becomes smaller
3. becomes bigger
4. stays the same size
5. not enough information
A metal gas can will float up into the air if you fill it with
1. sand
2. water
3. air
4. helium
5. nitrogen
6. all of the above
7. none of the above
A pair of Magdeburg hemispheres are placed in contact and then evacuated. In which of the following situations would it take the most force to pull them apart
1. out in space
2. at the top of the earth's atmosphere
3. at sea level
4. 1 km beneath the ocean surface
5. 5 km below the ocean surface
A balloon filled with air is tied to a diver's helmet with a 1 foot long string. As the diver dives to the bottom of a deep lake, the balloon
1. expands
2. contracts
3. expands and then contracts
4. contracts and then expands
5. alternates between expansion and contraction
6. stays the same volume
7. all of the above
As a steady wind rushes over a pointed roof, the pressure above the roof is
1. higher
2. lower
3. the same
4. alternates between higher and lower
5. all of the above
If you were to measure out a plot of land on a very cold day the resulting plot would be ___ if you used a cloth tape-measure compared to a steel tape-measure.
1. larger
2. smaller
3. the same
4. none of the above
5. all of the above
To reduce the odds of your radiator coolant freezing in the winter, let's say that you add a chemical that changes the specific-heat of the coolant. You want the specific heat to
1. increase
2. decrease
3. stay the same
4. none of the above
5. all of the above
You hide your gold ring in your freezer. As the ring drops in temperature, the hole inside the ring becomes
1. larger
2. smaller
3. stays the same
4. none of the above
5. all of the above
The boiling point of water is 100 degrees C. What would this be on a Kelvin scale?
1. 100 K
2. 73 K
3. 173 K
4. 273 K
5. 373 K
6. 473 K
7. 573 K
You fill a glass bottle with water and put it in your freezer. The next morning you find that the bottle has shattered. This is because
1. the bottle expanded
2. the bottle contracted
3. the water expanded when it froze in the bottle
4. the water contracted when it froze in the bottle
5. leprechauns in the freezer
6. space aliens from mars
Copper and aluminum have outer electrons that are loosely bound to the atoms. This makes these elements
1. poor electrical conductors
2. expensive
3. pure
4. slippery
5. good electrical conductors
6. all of the above
7. none of the above
Radiation from the star "Betelgeuse" is of longer wavelength than the sun. This means that the sun is ___ compared to that star.
1. cooler
2. hotter
3. at the same temperature
4. larger
5. smaller
6. bluer
At the same temperature, molecules of hydrogen have ___ speed compared to molecules of oxygen.
1. higher
2. lower
3. the same
4. no
5. infinite
At 350 degrees C, your oven radiates with a wavelength that is ___ compared to your stove top that is 500 C.
1. shorter
2. longer
3. the same
4. none of the above
5. all of the above
To reduce the odds of being burned, would you choose to walk rapidly across a bed of red hot
1. coal
2. iron
3. gold
4. aluminum
5. all of the above
When water freezes it
1. absorbs energy
2. gives off energy
3. neither
4. both
You wet your finger before you briefly touch a clothes iron. The protection (from wetting your finger) would be higher if the "heat of vaporization" of the water is
1. higher
2. lower
3. the same
4. zero
5. all of the above
When a metal is heated until it vaporizes, it
1. absorbs energy
2. gives off energy
3. neither
4. both
As your neighborhood pond is in the process of freezing over, it ___ the surrounding air.
1. cools
2. warms
3. neither cools nor warms
4. both warms and cools
Water at 0 degrees C will warm up faster than ice at 0 degrees C, because
1. water is more liquid
2. ice is more solid
3. ice absorbs heat when it melts
4. ice gives out heat when it melts
5. water likes ice
6. there is no ice at the earth's equator
The pitch (frequency) of a car's horn ___ as the car drives past you.
1. rises
2. drops
3. stays the same
4. all of the above
5. none of the above
The frequency of a pendulum on a high-gravity planet is ____ compared to the frequency on a low-gravity planet.
1. higher
2. lower
3. the same
4. all of the above
5. none of the above
A buoy rises and falls by a total height of 2 meters on the open ocean. What is the amplitude of the waves.
1. 2 meters
2. 4 meters
3. 1 meter
4. 0.5 meters
5. 8 meters
6. all of the above
A star is moving towards our solar system. Based on the Doppler effect, the frequency of its light is shifted towards
1. blue
2. red
3. white
4. black
5. all of the above
For two waves to be in phase, a sufficient condition is that the waves have the same
1. amplitude
2. wavelength
3. frequency
4. speed
5. instants in time at which the wave amplitude is zero

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