Four identical samples of a metal are heated to different temperatures. Based on the colors of their incandescences, which sample is the hottest? The sample that is

Q-1: Four identical samples of a metal are heated to different temperatures. Based on the colors of their incandescences, which sample is the hottest? The sample that is:

1) blue-white
2) bright red
3) yellow
4) orange
ANSWER: 1 -- BLUE-WHITE

Q-2: A 5 kilogram mass is lifted at constant velocity from a shop floor by a rope that passes through a pulley attached to the shop's ceiling. Neglecting the mass of the rope and friction in the pulley, what is the approximate tension in the rope?

1) 100 newtons
2) 50 newtons
3) 25 newtons
4) 5 newtons
ANSWER: 2 -- 50 NEWTONS

Q-3: Ball "A" ROLLS down an inclined plane without slipping. An identical ball, Ball "B", SLIDES down the same inclined plane without rolling. Which of the following statements is true?

1) Ball "A" has more kinetic energy
2) Ball "B" has more kinetic energy
3) their kinetic energies are the same
4) their rotational kinetic energies are equal just after release
ANSWER: 3 -- THEIR KINETIC ENERGIES ARE THE SAME

Q-4: An object located four focal lengths in front of a thin, converging lens is moved to within two focal lengths of the lens. As a result, does the size of the image produced by the lens increase, decrease or remain the same?

ANSWER: INCREASE

Q-5:  What is the wavelength in millimeters of a sound wave whose frequency is 35 KILOHERTZ. Assume the speed of sound is 350 METERS PER SECOND?

1) 100 millimeters
2) 1,000 millimeters
3) 10 millimeters
4) 1/10 millimeters
ANSWER: 3 -- 10 MILLIMETERS

Q-6: Heat from the sun reaches the Earth by:

1) conduction
2) convection
3) radiation
4) none of the above
ANSWER: 3 -- RADIATION

Q-7:  What is a calorie?

1) amount of heat required to raise one gram of water one degree Celsius.
2) amount of work required to move one gram of water by one centimeter.
3) amount of heat required to melt ice.
4) amount of heat required to raise one gram of water one degree Fahrenheit
ANSWER: 1 -- AMOUNT OF HEAT REQUIRED TO RAISE ONE GRAM OF
WATER ONE DEGREE CELSIUS

Q-8:  To within 1 pound per square inch, what is the nominal pressure due to water at a depth of 100 feet below the surface of a body of water?

ANSWER: 43.3 POUNDS PER SQUARE INCH (accept 42.3 to 44.3)

Q-9: The energy of molecular motion in a gas appears in the form of:

1) friction
2) internal energy
3) temperature
4) potential energy
ANSWER:3 -- TEMPERATURE