REVISION SCIENCE TO EXCEL IN A-LEVEL PHYSICS A-levelPHYSICS7408/3BC
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PHYS 123
Instelling
PHYS 123
1. Current is measured by: A. volts B. calories C. amps D. watts E. ohms 2. A volt is a measure of A. energy per electron B. number of electrons per second C. force on the electron D. density of electrons 3. Magnetism comes from A. magnetic monopoles B. moving quanta of light C. quantization of cha...
1 current is measured by a volts b calories c amps d watts e ohms 2 a volt is a measure of a energy per electron b number of electrons per second c force on the electron d density of elect
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PHYS 123
PHYS 123
PHYS 123
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PHYS 123 EXAM 2
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1. Current is measured by:
C. amps
A. volts
B. calories
C. amps
D. watts
E. ohms
2. A volt is a measure of
A. energy per electron A. energy per
B. number of electrons per second elec- tron
C. force on the electron
D. density of electrons
3. Magnetism comes from
A. magnetic monopoles D. moving
B. moving quanta of light electric charge
C. quantization of charge
D. moving electric charge
4. In a permanent magnet, the magnetism comes
from: A. the spin of
A. the spin of the electrons the electrons
B. the motion of the protons
C. the high voltage inside the atom
D. the electron avalanche
5. Magnetic monopoles D. have
A. are found at the ends of magnets never been
B. are produced by cosmic rays found
C. are found in the Earth's core
D. have never been found
6. Rail guns push the projectile using
A. high-energy explosives C. magnetic fields
B. electric fields
C. magnetic fields
D. protons
7. Telsa wanted to use a transformer to distribute
elec- tricity because C. it
1/
, PHYS 123 EXAM 2
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decreased the current going
2/
, PHYS 123 EXAM 2
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A. it allowed there to be a power plant in every through long
neigh- borhood. wires to reduce
B. it made high voltage less dangerous the loss of
C. it decreased the current going through long electricity.
wires to reduce the loss of electricity.
D. it was given strong support by Thomas
Edison, who popularized it
8. You can demagnetize a natural magnet
A. by placing it on a TV or computer screen C. by heating
B. by placing it in a very strong electric field it above the
C. by heating it above the Curie point Curie point
D. none of the above
9. Which of the following use or consist of
permanent magnets? (Choose all that apply.) A. lodestones
A. lodestones C. compasses
B. transformers D. earphones
C. compasses
D. earphones
10. What discovery now allows for headphones to
be small and light? B. rare-earth
A. dynamos mag- nets, such
B. rare-earth magnets, such as samarium cobalt
as samarium
C. transformers
cobalt
D. maraging steel
11. Theoretically, the Earth should not have a
permanent magnet in its core because
A. its interior is too hot
A. its interior is
B. the Earth spins
too hot
C. there is not enough iron
D. magnets do not occur naturally
12. The Earth's magnetism comes from
A. a dynamo in the core
B. permanent magnets in the core
C. iron in the crust A. a dynamo in
the core
3/
, PHYS 123 EXAM 2
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D. monopoles near (but not at) the north and south
geographic poles
13. The Earth flips its magnetism, on average, B. twice every
approxi- mately mil- lion years
A. once every 11 years
B. twice every million years
C. once every billion years
D. never (at least not yet)
14. The north geographic pole of the Earth A. is a south
A. is a south magnetic pole mag- netic pole
B. has always had the same polarity
C. is exactly at the magnetic pole
D. none of the above
15. Compasses point north because C. there are
A. the North Star attracts them elec- tric
B. the Earth has an electric charge currents in the
C. there are electric currents in the iron core of iron core of the
the Earth Earth
D. there are magnetic monopoles near the North
Pole
16. Electricity will heat a wire if it has
B. high current
A. high voltage
B. high current
C. high frequency
D. DC rather than AC
17. Static electricity occurs when two surfaces
B. electrons
rub against each other and
flow from one
A. protons flow from one to another
to anoth- er
B. electrons flow from one to another
C. positrons flow from one to another
D. neutrons flow from one to another
18. Europe uses higher voltage in homes because it
A. creates less heat in home wiring A. creates
B. carries greater power less heat in
4/
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