The anti-particle to an electron is:

Q-1;The anti-particle to an electron is:

1) proton
2) positron
3) neutron
4) anti-proton
ANSWER: 2 -- POSITRON

Q-2; The gravitational potential energy between two bodies is inversely proportional to:

1) the cube of the distance
2) the first power of the distance
3) the square of the distance
4) it has no relation to distance
ANSWER: 2 -- THE FIRST POWER OF THE DISTANCE

Q-3;An object is projected vertically upward near the surface of the earth. At the very top of its path, the object's velocity is zero, and its acceleration is:

1) 0
2) 9.8 meters per second squared DOWNWARD
3) 9.8 meters per second squared UPWARD
4) depends on the mass of the object
ANSWER:2 -- 9.8 METERS PER SECOND SQUARED DOWNWARD

Q-4; Of the following choices, approximately how many times greater is the mass of a proton than the mass of an electron?

1) 200
2) 2000
3) 20,000
4) 200,000
ANSWER: 2 -- 2000

Q-5;How many quarks make up a neutron?

ANSWER: 3