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271: Which one of the following particles travels at the speed of light?
w) Neutrons
x) Electrons
y) Photons
z) muons
ANSWER: Y -- PHOTONS
272: Heat is transferred from the sun to the earth primarily by:
w) Conduction
x) Convection
y) Radiation
z) Condensation
ANSWER: Y -- RADIATION
273: A block of wood initially at rest slides down an inclined plane. Neglecting friction, the kinetic energy of the block at the bottom of the plane is:
w) All converted into heat
x) Equal to its potential energy (with respect to the bottom of the plane) when it was at the top of the plane
y) less than its kinetic energy at the top of the plane
z) Dependant on the materials of which the block is made
ANSWER: X -- EQUAL TO ITS POTENTIAL ENERGY (WITH RESPECT TO THE BOTTOM OF PLANE) WHEN IT WAS AT THE TOP OF THE PLANE.
274: When an atom undergoes beta decay, the atomic number of the nucleus:
w) is unchanged
x) Increases by one
y) Decreases by one
z) None of the above
ANSWER: X -- INCREASES BY ONE
275: Name any three of the six quarks.
ANSWER: UP, DOWN, CHARM, STRANGE, TOP (or truth), BOTTOM (or beauty)
276: There are four fundamental forces in nature. A particle has been associated with each of these four forces. Name any TWO of these particles.
ANSWER: GRAVITON (for gravity), PHOTON (for electromagnetic), GLUONS for s
277: The force on a charged particle moving parallel to magnetic field lines is:
w) In the direction of the field
x) Zero
y) Perpendicular to the field
z) In the opposite direction of the field
ANSWER: X -- ZERO
278: In any collision, which of the following is conserved?
w) Kinetic energy
x) Velocity
y) Momentum
z) Potential energy
ANSWER: Y – MOMENTUM
279: Which of the following will increase the ANGULAR MOMENTUM of a person spinning on a rotatable frictionless bar chair?
w) Moving the arms closer to the body
x) Moving the arms farther from the body
y) Moving one arm farther from the body and the other arm closer to the body with spastic repetition
z) None of these
ANSWER: Z -- NONE OF THESE
280: What is the relationship between the frequency and the period of a wave?
ANSWER: THEY ARE INVERSES OF EACH OTHER
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