The direction of a magnetic field at a point can be determined by
a. a generator.
b. a compass.
c. a transformer.
d. electromagnetic induction.
e. none of the above.
[Ques. 2] The deviation from the way a compass needle points from the true north direction is the
a. greenhouse effect.
b. magnetic inclination.
c. magnetic declination.
d. magnetic resonance effect.
e. none of the above
[Ques. 3] Thermograms use ultraviolet radiation to sense heat.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 4] The ionosphere can be used to conduct radio communications over long distances.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 5] Higher frequency radio waves are reflected by the ionosphere.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 6] The magnetic compass in an aircraft points to the geographic North Pole.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 7] N rays do not exist.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 8] AM radio stations have greater range than FM stations because they have more powerful transmitters.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 9] A coil of wire is connected to a galvanometer. When the coil is rotated in a magnetic field, the galvanometer records a current because the free electrons in the moving wire experience a force from the magnetic field that pushes them through the wire.
a. True
b. False
Indicate whether the statement is true or false
[Ques. 10] A coil of wire is connected to a galvanometer. When a bar magnet is moved in and out of the coil, the galvanometer records a current because of electromagnetic induction.
a. True
b. False
Indicate whether the statement is true or false
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