1. A neutron star will be detected from Earth as a pulsar by itsregular radio pulses only if
A Earth lies within thepath of the narrow beam of radiation being generated by the neutronstar along its magnetic axis as the star rotates rapidly.
B Earth lies in the neutronstar's "equator", the plane perpendicular to its spinaxis.
C Earth lies in the plane ofthe neutron star's magnetic equator, halfway between its magneticpoles.
D Earth lies directly abovethe rotation axis of the rotating neutron star.

2. What is believed to be the maximum mass for a neutronstar?
A 12 solarmasses.
B 1.4 solar mass.
C 3 solar masses.
D 150 solar masses.

3. What is "special" about special relativity?
A It deals only withobjects that are at rest relative to each other.
B It deals only with objectsmoving in the absence of gravity.
C It deals only with objectsmoving in the presence of gravity.
D It deals only with motionat speeds significantly less than the speed of light.

4. In what way is the general theory more general (deals with moresituations) than the special theory of relativity?
A It includes thechange in the rate of passage of time when objects are inmotion.
B It includesgravitation.
C It includes motion at thespeed of light.
D It includes constant,unaccelerated motion.

5. How does a gravitational field affect the passage oftime?
A Clocks in agravitational field run slower than clocks outside thefield.
B Gravity has no effect onthe passage of time.
C Clocks in a gravitationalfield run faster than clocks outside the field.
D Gravity makes timestop.

6. If the Sun were replaced by a 1-solar-mass black hole, then theEarth would
A head off intointerstellar space along a straight line tangent to its originalorbit around the Sun.
B enter an elliptical orbitpassing close to the black hole, with its furthest distance fromthe black hole equal to 1 AU.
C spiral quickly into theblack hole.
D continue to orbit theblack hole in precisely its present orbit.