An immersed body is buoyed up by a force equal to the weight of fluid it displaces; this is known as the:

A.immersion

B. flotation

C. Archimedes Principle

D. buoyancy

The volume of liquid or gas flowing is the same if tehre is a narowwing or widening of the flow. This is known as:

A. Archimedes Principle

B. Boyle's Law

C. buoyancy

D. Bernoulli's Principle

When gas in a container is squeezed to half its volume and the temperature remains the same, tha gas pressure

A. quadruples

B. doubles

C. halves

D. remains the same

A dam is thicker at the bottom than at the top because

A. water is denser at deeper levels

B. surface tension exists only on the surface of liquids

C. water pressure is greater with increasing depth

D. none of the above

True or False:

In water, the deeper you swim, the greater the pressure because of the weight of the fluids directly above you.

Objects weigh less when submerged under water because of the upward force exerted by the water that is exactly opposite in the direction of gravity. This upward force is referred to as:

A. flotation

B. pressure

C. buoyancy

D. neither

True or False:

One cubic meter of air has a mass of 1.2 Kg, about 10 Neutons. If a mass of 1 cubic meter object is greater than 1.2 Kg, the object will float in air.

When a chocolate bar is cut in half, its density is

A. halved

B. unchanged

C. doubled

D. none of the above

Compared to a bar of pure gold, the density of a pure gold ring is

A. less

B. the same

C. more

D. none of these

The air in this room has:

A. mass

B. wight

C. energy

D. all of these

When you touch a cold piece of ice with your fingers, energy flows:

A. from your finger to the ice

B. from the ice to your finger

C. actually both ways

D. none of these

The boiling point of water using the Kelvin scale is

A. 100 degrees

B. 212 degrees

C. 373 degrees

D. 273 degrees

The amount of heat needed to change the temperature of water by 1 degree Celcius is generated by:

A. 1 calorie

B. 10 calories

C. 100 calories

D. 1,000 calories

The lowest temperature possible in nature is

A. 0 degrees C

B. -273 degrees C

C. 4 degrees K

D. -100 degrees C

The 1st Law of Thermodynamics states that

A. energy flows from an area of high concentration to an area of low concentration

B. no system can reach absolute zero

C. energy cannot be created or destroyed

D. none of these

The 2nd Law of Thermodynamics

states that

A. energy flows from an area of high concentration to an area of low concentration

B. no system can reach absolute zero

C. energy cannot be created or destroyed

D. none of these

The 3rd Law of Thermodynamics states that

A. energy flows from an area of high concentration to an area of low concentration

B. no system can reach absolute zero

C. energy cannot be created or destroyed

D. none of these

The temperature reading of 15 degrees C is what temperature reading on the Kelvin scale?

A. 15

B. 288

C. 313

D. none of the above

True or False?

The three temperature scales, Fahrenheit, Celsius and Kelvin, have negative numbers.

Which of the following normally warms up faster when heat is applied?

A. water

B. iron

C. glass

D. wood

The radiant energy emitted by Earth is

A. conduction

B. convection

C. terrestrial radiation

D. fusion

The transfer of thermal energy in a gas or liquid by means of currents in the heated fluid is called

A. conduction

B. convection

C. radiation

D. fusion

The transfer of thermal energy by means of electromagnetic waves is called

A. conduction

B. convection

C. radiation

D. fusion

The change of phase at the surface of a liquidas it passes to the gaseous phase is called

A. sublimation

B. boiling

C. freezing

D. evaporation

A low temperature source meits what frequency of wavelength?

A. long

B. short

C. medium

D. none of the above

The pupil of your eye is a net

A. emitter of radiant energy

B. absorber of radiant energy

C. neither of the above

A positive ion has more

A. electrons than neutrons

B. electrons than protons

C. neutrons than protons

D. protons than electrons

A good heat conductor is a

A. poor insulator

B. good insulator

C. neither

True or False

The good insulating properties of wool, fur and feathers are largely due to the air spaces they contain.

True or False

If a surface absorbs more energy than it emits it is a net emitter.

An example of radiant energy is:

A. steam

B. vapor

C. light

D. conduction

A physical change directly from a solid to a gas occurs in:

A. iron

B. mercury

C. dry ice

D. helium

In an electrically neutral atom, teh number of protons in the nucleus is equal to the number of

A. electrons that surround the nucleus

B. neutrons in the nucleus

C. both of these

D. neither of these

True or False:

Protons and neutrons have a positive charge.

Strip electrons from an atom and the atom becomes a

A. positive ion

B. negative ion

C. neutral ion

D. neither

True or False

Temperature affects electrical resistance; the hotter the object, the greater the resistance.

Electrical resistance is measured in

A. amperes

B. conductivity

C. current

D. ohms

A battery produces which kind of current

A. alternating current

B. direct current

A main difference between gravitational and electrical forces is that electrical forces

A. obey the inverse-square law

B. are weaker

C. attract

D. repel or attract

Ohm discovered that the amount of current in a circuit is directly proportional to the voltage established across the circuit and is inversely proportional to the

A. current

B. electricity

C. pressure

D. resistance

A positive charged ion is called

A. anode

B. cathode

C. cation

D. anion

A negative charged ion is called:

A. anode

B. cathode

C. cation

D. anion

True or False

Both positive and negative poles must exist in order to have a magnet.

True or False

In most magnets, electron spin is the main cnotruibutor to magnetism.

True or False

A pair of electrons spinning in the dame direction creates a weaker magnet.

True or False

In a home air conditioner's motor, electical energy is the output and mechanical energy is the input.

True or False

In a generator, mechanical energy is the input and electrical energy is the output.

True or False

An alternator produces a direct current (DC).

A device that transforms electrical energy into mechanical energy is a

A. generator

B. motor

C. magnet

D. transformer