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341: In changing from an energy state of -1.51 electron-volts to -3.40 electron-volts, an atom emits a photon whose energy is:
w) 1.51 electron-volts
x) 1.89 electron-volts
y) 3.40 electron-volts
z) 4.91 electron-volts
ANSWER: X -- 1.89 ELECTRON-VOLTS
342: In an elastic collision, the RELATIVE velocities of separation of the two bodies after impact compared with the relative velocity of approach before impact is:
w) Always greater
x) Always smaller
y) Always the same
z) First greater, then smaller
ANSWER: Y -- ALWAYS THE SAME
343: Two hockey pucks, of unequal mass and connected by a spring of negligible mass, rest on a horizontal frictionless surface. The spring is released, and the pucks move apart. The center of mass of the two pucks does one of the following. Does it:
w) Move in a circle
x) Move in the direction of the greater mass
y) Remain stationary
z) Move in the direction of the smaller mass
ANSWER: Y -- REMAIN STATIONARY
344: A 500 kilogram car moving at 20 meters per second strikes a stone wall and is brought to a halt in 0.1 second. The average force of the car on the wall during impact is:
w) 10 Newton’s
x) 1000 Newton’s
y) 10,000 Newton’s
z) 100,000 Newton’s
ANSWER: Z -- 100,000 NEWTONS
345: A bullet is fired with a muzzle velocity of 1000 meters per second from a rifle clamped to a window 4.9 meters above ground level. Neglecting air resistance, the horizontal distance from the rifle at which the bullet will strike the ground is
w) 4.9 meters
x) 500 meters
y) 1000 meters
z) 4900 meters
ANSWER: Y -- 1000 METERS
346: The acceleration due to gravity on the moon is 1.6 meters per second squared. If a pendulum is whose length is 6.4 meters is placed on the moon, its period will be:
w) 1.57 seconds
x) 3.14 seconds
y) 12.56 seconds
z) 25.12 seconds
ANSWER: Y -- 12.56 SECONDS
347: Of the following, the type of wave that CANNOT be polarized is
w) Electromagnetic
x) Light
y) Sound
z) Radio
ANSWER: Y -- SOUND
348: Pressure is equal to:
w) Area divided by force
x) Force divided by area
y) Area times force
z) Area minus force
ANSWER: X -- FORCE DIVIDED BY AREA
349: The radiator of a room contains 10 kilogram of water. If the water gives off 50,000 calories of heat to the room, the drop in temperature of the water is:
w) 1 degree Celsius
x) 2 degrees Celsius
y) 5 degrees Celsius
z) 10 degrees Celsius
ANSWER: Y -- 5 DEGREES CELSIUS
350: In N-type semiconductors the majority of the carriers are:
w) Holes
x) Electrons
y) Protons
z) Neutrons
ANSWER: X -- ELECTRONS
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