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The airspeed of an airplane is 200 km/h. When it is caught in a 200-km/h crosswind, its
speed across the ground below is
A) 0 km/h.
B) 200 km/h.
C) 283 km/h.
D) 400 km/h.
E) 1600 km/h.
An iron rod becomes magnetic when
A) opposite ions accumulate at each end.
B) its atoms are aligned.
C) the net spins of many of its electrons are aligned.
D) its electrons stop moving and point in the same direction.
E) none of the above
When ice crystals form in clouds, the surrounding air
A) warms.
B) cools.
C) neither of these
Which experiment best illustrates the particle-like nature of light?
A) photoelectric effect
B) double-slit experiment
C) both of these
D) neither of these
A photovoltaic cell receives energy input by
A) conduction.
B) convection.
C) radiation.
D) all of the above
When an ice cube in a glass of water melts, the water level
A) rises.
B) falls.
C) remains the same.
If you float a piece of wood in a container brim-full of water that rests on a weighing
scale, some water will spill. Then the weight reading on the scale will
A) decrease.
B) remain unchanged.
C) increase.
Which equation is correct for wave speed?
A) wave speed = frequency x wavelength
B) wave speed = (1/period) x wavelength
C) both of these
D) neither of these
The spacing between the parallel power lines is affected by
A) current-carrying capacities of wires.
B) electrical insulation.
C) the wing span of birds in the vicinity.
D) none of the above
An electrically charged atom is an
A) ion.
B) isotope.
C) both of these
D) neither of these
An inventor discovers a harmless and tasteless salt, which when added to water changes
its boiling point. The market value for this salt will be better if the salt
A) lowers the boiling point of water.
B) raises the boiling point of water.
C) either raises or lowers the boiling point, as the food would be cooked either way.
D) none of the above
Which of these three produces the greatest tidal effect on you right now?
A) the Moon
B) the Sun
C) the Earth
An important condition for operation of the Falkirk Wheel is that
A) water in each gondola have the same depth.
B) ships carried are more or less equal in weight.
C) no water spill when a ship enters a gondola.
D) all of the above
E) none of the above
In an electrically neutral atom the number of protons in the nucleus is equal to the
number of
A) electrons that surround the nucleus.
B) neutrons in the nucleus.
C) both electrons and neutrons.
D) none of the above
An object that completes 20 vibrations in 10 seconds has a frequency of
A) 0.5 hertz.
B) 1 hertz.
C) 2 hertz.
D) 200 hertz.
A 1056-hertz tuning fork is struck at the same time as a note on the piano and you hear
2 beats/second. You tighten the piano string very slightly and then hear 3 beats/second.
What is the frequency of the piano string?
A) 1053 hertz
B) 1054 hertz
C) 1056 hertz
D) 1058 hertz
E) 1059 hertz
In the process of fluorescence, the input is high-frequency light and the output is
A) higher-frequency light.
B) equally high-frequency light.
C) lower-frequency light.
D) none of the above
U-235 and Pu-239 are both
A) radioactive isotopes.
B) fissionable isotopes.
C) heavier than lead.
D) all of the above
E) none of the above
A car traveling at 100 km/h strikes an unfortunate bug and splatters it. The force of
impact is
A) greater on the bug.
B) greater on the car.
C) the same for both.
The whiteness of clouds, unlike the blueness of the sky, primarily involves
A) medium sized particles.
B) reflection and refraction of sunlight.
C) seeds upon which condensation of cloud material forms.
D) water prisms.
A refrigerator
A) produces cold.
B) causes internal energy to disappear.
C) transfers internal energy from inside to outside.
D) transfers heat into cold.
E) none of the above
A bowling ball and a baseball accelerate equally when falling in a vacuum because
A) their velocities are the same.
B) the ratio of their weights to mass is the same.
C) the force of gravity is the same for each in a vacuum.
D) the force of gravity does not act in a vacuum.
E) none of the above
The intensity of cosmic rays bombarding the Earth's surface is most at the
A) poles.
B) mid-latitudes.
C) equator.
A reason for electric shielding inside a conductor is that any free electrons inside would
A) not obey the inverse-square law.
B) cancel one another.
C) be set in motion until equilibrium is established, on the outside.
D) all of the above
E) none of the above
Between the processes of nuclear fission and fusion, radioactive by-products are more
characteristic of nuclear
A) fission.
B) fusion.
C) both of these
D) neither of these
If an apple experiences a constant net force, it will have a constant
A) velocity.
B) speed.
C) acceleration.
D) position.
E) more than one of the above
An electron is pushed into an electric field where it acquires a 1-V electrical potential.
If two electrons are pushed the same distance into the same electric field, the electrical
potential of the two electrons is
A) 0.25 V.
B) 0.5 V.
C) 1 V.
D) 2 V.
E) 4 V.
What is the wavelength of a 1-hertz electromagnetic wave?
A) less than 1 m
B) 1 m
C) more than 1 m
A certain light source blinks once per second in its own frame of reference. As you
recede from the blinking source, you observe the frequency of blinks to be
A) less than 1 Hz.
B) 1 Hz.
C) more than 1 Hz.
If the frequency of blinks for a light source appears to double as the light source
approaches you, the frequency of blinks as it moves away from you at the same speed
A) is halved.
B) is doubled.
C) stays the same.
Which of the following is an inert gas?
A) Hydrogen
B) Helium.
C) Carbon
D) Oxygen
A pair of air pucks on an air table are set in motion when a compressed spring between
them is released. If one puck moves with twice the speed of the other, then its mass is
A) half the mass of the other.
B) the same mass as the other.
C) twice the mass as the other.
D) need more information
The induced electric and magnetic fields of Maxwell are
A) parallel to each other.
B) perpendicular to each other.
C) non-directional.
In Heisenberg's formula, △p △x≥ h, the h symbolizes
A) Planck's constant.
B) an average value of Planck's constant.
C) the peak value of Planck's constant.
D) Planck's constant divided by 2π.
E) none of the above
Objects moving at relativistic speeds appear to observers at rest to be
A) stretched.
B) shrunken.
C) either depending on direction of motion.
D) none of the above
