A power line with a resistance of 2 ohms draws a current of 80 A. The power dissipated
in the line is
A) 40 W.
B) 160 W.
C) 320 W.
D) 12,800 W.
E) none of the above
Answer:
Increasing the temperature of 1 gram of ice-cold water to the temperature of boiling
water requires
A) 80 calories.
B) 100 calories.
C) 540 calories.
D) none of the above
Answer:
The element uranium (U, atomic no. = 92) often has 146 (or more) neutrons but it will
still undergo radioactive decay. Which statement might best describe why?
A) The attractive force of the nucleons has a limited range.
B) The isolated neutron is not stable and will undergo spontaneous transformation into
a proton and an electron.
C) The force is strong with U, but tainted with the dark side it is.
D) both A and B
E) none of the above
Answer:
Without air resistance, a projectile fired horizontally at 8 km/s from a mountain top will
A) accelerate downward at g as it moves horizontally.
B) trace a curve that matches Earth’s curvature.
C) return to its starting position and repeat its falling behavior.
D) all the above
E) none of the above
Answer:
Rank the following compounds by solubility in water, from most soluble to least.
1) CH3CH2OH
2) CH3OCH3
3) CH3CH2NH2
A) 1, 3, 2
B) 1, 2, 3
C) 3, 2, 1
D) 3, 1, 2
E) 2, 1, 3
Answer:
As water in a confined pipe speeds up, the pressure it exerts against the inner walls of
the pipe
A) increases.
B) decreases.
C) remains constant if flow rate is constant.
D) none of the above
Answer:
The vibrations of a longitudinal wave move in a direction
A) of wave travel.
B) at right angles to the direction of wave travel.
C) opposite to wave travel.
Answer:
To say that evaporation is a cooling process is to say that the
A) water left behind is cool.
B) air cools as water warms.
C) condensation is minimum.
Answer:
Seismic waves are classified as body waves and surface waves. An example of a body
wave is a
A) Primary wave (P-wave).
B) Love wave.
C) Rayleigh wave.
D) Tertiary wave (T-wave).
Answer:
A cannonball fired from a long-barrel cannon will have a greater muzzle velocity
because the cannonball receives a greater
A) force.
B) impulse.
C) both of these
D) none of the above
Answer:
Which of these are good conductors?
A) feathers
B) wood
C) snow
D) all the above
E) none of the above
Answer:
When the temperature of a quantity of 0-C air at constant pressure is lowered by 1
degree, its volume
A) shrinks by 1/273.
B) shrinks by 100/273.
C) increases by 1/273.
D) increases by 100/273.
Answer:
Ninety-five percent of light incident on a mirror is reflected. How much light is
reflected from three mirrors in succession?
A) 81%
B) 86%
C) 90%
D) 95%
Answer:
What is the weight of water displaced by a 100-ton floating ship?
A) less than 100 tons
B) 100 tons
C) more than 100 tons
D) 100 cubic meters
E) depends on the density of water
Answer:
A sonic boom cannot be produced by
A) an aircraft flying slower than the speed of sound.
B) a whip.
C) a speeding bullet.
D) all of the above
Answer:
If uranium were to split into three segments of equal size instead of two, would more
energy or less energy be released?
A) Less energy would be released because of less mass per nucleon.
B) Less energy would be released because of more mass per nucleon.
C) More energy would be released because of less mass per nucleon.
D) More energy would be released because of more mass per nucleon.
Answer:
Development of Earth’s early oceans was likely due to
A) water-rich meteors bombarding Earth’s surface.
B) volcanic outgassing in Precambrian time.
C) intense convection in the mantle, and severe heat dissipation from Earth’s interior.
D) cooler temperatures that promoted the condensation of water vapor in the
atmosphere.
Answer:
A chemical equation for the combustion of propane, C3H8, is shown below. Through
this reaction is the carbon oxidized or reduced?
+ 5 → 3 + 4 O
A) The carbon is oxidized.
B) The carbon is reduced.
C) Some of the carbons are oxidized while others are reduced.
D) The carbon is neither oxidized nor reduced.
Answer:
When a loaf of bread is compressed, its
A) molecules decrease in size.
B) density decreases.
C) density increases.
D) none of the above
Answer:
A dam is thicker at the bottom than at the top because
A) water is denser at deeper levels.
B) water pressure is greater at deeper levels.
C) water is cooler at deeper levels.
D) dams look better.
E) none of the above
Answer:
What any type of field generation cannot create is
A) light.
B) electromagnetic waves.
C) energy.
Answer:
Two equal-sized buckets are brim-filled with water, one with a piece of floating wood
and the other without. If the buckets are put on a weighing scale, the heavier one is
A) the bucket with the floating wood.
B) the bucket without the wood in it.
C) either, for the weights of both are the same.
Answer:
The best evidence that the Sun is a newcomer in the universe is
A) the existence of heavy elements in its composition.
B) its relatively slow rate of spin.
C) its high temperature as revealed by its color.
D) its position in the galaxy.
E) its very existence in spite of its high burning rate.
Answer:
How can a hydrogen atom, which has only one electron, have so many spectral lines?
A) The electron is able to move at various speeds.
B) The protons in the nucleus are also giving off various light frequencies.
C) One electron can be boosted to many different energy levels.
D) The atomic radius of the hydrogen atom is relatively large.
Answer:
Heavy snow showers and low temperatures in Buffalo, New York are most likely
caused by a
A) continental tropical air mass.
B) continental polar air mass.
C) maritime tropical air mass.
D) maritime polar air mass.
Answer:
The charges with sodium chloride are all balanced-for every positive sodium ion there
is a corresponding negative chloride ion. Since its charges are balanced, how can
sodium chloride be attracted to water, and vice versa?
A) Dispersion forces come into play as the sodium chloride and water come into close
proximity.
B) Hydrogen bonding in water allows the sodium chloride molecule to be attracted to
the water molecule.
C) As a water molecule gets close to the sodium chloride it can distinguish the various
ions and it is thus attracted to an individual ion by ion-dipole forces.
D) This is not a matter of attraction. Sodium chloride dissolves in water because water
provides a medium in which the individual sodium and chloride ions can disperse.
Answer:
Why does oxygen have such a low solubility in water?
A) Water’s attraction for itself is stronger than its attraction for oxygen molecules.
B) Water and oxygen only attract one another by means of weak dipole-induced dipole
attractions.
C) The hydrogen bonding in water keeps the oxygen solubility low.
D) Both A and B are true.
Answer:
In a dream you’re in a car traveling at 50 km/h and you bump into another car traveling
toward you at 48 km/h. The speed of impact is
A) 48 km/h.
B) 50 km/h.
C) 98 km/h.
D) 2400 km/h.
Answer:
If there were no gravity, a ball thrown upward at an angle would follow a straight-line
path. Due to gravity, however, at the end of 1 s it is
A) 5 m below the straight line.
B) 10 m below the straight line.
C) 15 m below the straight line.
D) 20 m below the straight line.
E) more than 20 m below the straight line.
Answer:
A swimmer cannot snorkel more than a meter deep because air
A) in the lungs cannot be easily expelled.
B) tends to liquefy in the snorkel tube.
C) is buoyed up leaving the swimmer breathless.
D) at the surface will not freely enter the higher-pressure region in the compressed
lungs.
E) all of the above
Answer:
Rainbows are not usually seen as complete circles because
A) the ground is usually in the way.
B) they are actually elliptical.
C) they have no bottom part.
D) raindrops are not perfectly round.
E) rainbows are arched shaped.
Answer:
Which will remain the same for two identical books, one lying flat and the other
standing on an end?
A) weight only
B) pressure only
C) both pressure and weight
D) none of the above
Answer: