# Science Bowl (Physics Part 11)

Science Bowl
PHYSICS
PHYS-92; Multiple Choice: Light bends around sharp corners as a result of w) refraction x) reflection y) diffraction z) dispersion
PHYS-92; Multiple Choice: A light ray traveling from glass into air strikes the glass-air surface at an angle 50 degrees to the normal. If the critical angle for the glass-air combination is 42 degrees, the percentage of light reflected from the surface is w) 6 x) 25 y) 38 z) 100
PHYS-92; Multiple Choice: In the Millikan oil-drop experiment the UPWARD force on the drop is due to the: w) gravitational and electric fields x) gravitational field and the charge on the drop y) electric field and the size of the drop z) electric field and the charge on the drop
ANSWER: Z -- ELECTRIC FIELD AND THE CHARGE ON THE DROP
PHYS-92; Multiple Choice: 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
Physics - 71 Science Bowl
PHYSICS
PHYS-92; Multiple Choice: 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
PHYS-92; Multiple Choice: 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
PHYS-92; Multiple Choice: 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 Newtons x) 1000 Newtons y) 10,000 Newtons z) 100,000 Newtons
PHYS-92; Multiple Choice: 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
Physics - 72 Science Bowl
PHYSICS
PHYS-92; Multiple Choice: 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
PHYS-92; Multiple Choice: Of the following, the type of wave that CANNOT be polarized is w) electromagnetic x) light y) sound z) radio
PHYS-92; Multiple Choice: 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
PHYS-92; Multiple Choice: 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
Physics - 73 Science Bowl
PHYSICS
PHYS-92; Multiple Choice: In N-type semiconductors the majority of the carriers are: w) holes x) electrons y) protons z) neutrons
PHYS-92; Multiple Choice: As a pendulum swings from its highest to its lowest point, it has the SMALLEST acceleration when it is: w) at its lowest point x) at its highest point y) at a point 1/3 the distance from the top of its swing z) at a point 1/2 the distance from the top of its swing.
ANSWER: W -- AT ITS LOWEST POINT
PHYS-92; Multiple Choice: Two cars collide head-on. They stop at the point of collision. Both cars must have one of the following. Do they have w) equal masses x) equal but opposite velocities before the collision y) equal but opposite momenta before the collision
ANSWER: Y -- EQUAL BUT OPPOSITE MOMENTA BEFORE THE COLLISION
PHYS-92; Multiple Choice: When the speed of a train moving on a circular track is doubled, the centripetal force acting on the train does one of the following. Does the force: w) remain the same x) increase by a factor of 2 y) increase by a factor of 4 z) increase by a factor of 8
ANSWER: Y -- INCREASE BY A FACTOR OF 4
Physics - 74 Science Bowl
PHYSICS
PHYS-92; Multiple Choice: It takes 500 watts to operate a machine whose power output is 480 watts. Which of the following is the efficiency of the machine? Is it w) 20% x) 48% y) 96% z) 98%
PHYS-92; Multiple Choice: Which of the following statements is TRUE about an ELASTIC collision between two particles? Is it true that: w) neither particle loses any of its kinetic energy x) neither particle loses any of its momentum y) the velocity gained by one particle is equal to that lost by the other z) the total kinetic energy before and after the collision remains constant
ANSWER: Z -- THE TOTAL KINETIC ENERGY BEFORE AND AFTER THE COLLISION RE
PHYS-92; Multiple Choice: Ten calories of heat are added to 2 grams of water. The temperature of the water rises to a total of how many degrees? Is it: w) 2 degrees Celsius x) 5 degrees Celsius y) 10 degrees Celsius z) 20 degrees Celsius
ANSWER: X -- 5 DEGREES CELSIUS
PHYS-92; Multiple Choice: If water is warmed from 0 degrees Celsius to 6 degrees Celsius, which of the following things happen. Will the water: w) expand steadily x) contract steadily y) expand at first and then contract z) contract first then expand
ANSWER: Z -- CONTRACT FIRST THEN EXPAND
Physics - 75 Science Bowl
PHYSICS
PHYS-92; Multiple Choice: A gas at 0 degrees C and at normal atmospheric pressure has a volume of 273 cubic centimeters. If it is held at constant pressure until its volume is doubled, its temperature will be which one of the following? Will it be w) 2 degrees Celsius x) 200 degrees Celsius y) 273 degrees Celsius z) 546 degrees Celsius
ANSWER: Y -- 273 DEGREES CELSIUS
PHYS-92; Multiple Choice: Infrared rays are absorbed best by which one of the following. Is it: w) bodies of air x) white bodies with rough surfaces y) mirrors z) black bodies with rough surfaces
ANSWER: Z -- BLACK BODIES WITH ROUGH SURFACES
PHYS-92; Multiple Choice: Energy stored in a body as thermal or internal energy consists of one of the following. Does it consist of: w) heat in the form of radiant energy x) molecular kinetic energy only y) molecular potential energy only z) both kinetic and potential energy
ANSWER: Z -- BOTH KINETIC AND POTENTIAL ENERGY
PHYS-92; Multiple Choice: When white light passes through a red plate of glass and then through a green plate of glass which one of the following things occur? w) the light is totally absorbed x) the light that emerges is a combination of red and green y) the light that emerges lacks only its red and green components z) the light that emerges is green
ANSWER: W -- THE LIGHT IS TOTALLY ABSORBED
Physics - 76 Science Bowl
PHYSICS
PHYS-92; Multiple Choice: By which one of the following can a real image be produced? Can it be produced by a: w) concave mirror x) plane mirror y) diverging lens z) convex mirror