practice test on heat

Question 1

which of the following is an example of heat conduction: a. An air vent in a furnace sending hot air into the house b. A metal cup heating up when hot water is poured into it c. the sun melting ice formed on a frosty lawn d. cool air sinking to the ground on a cold night

Answer 1

b. a metal cup heating up when hot water is poured into it

Question 2

in a room in the winter time where would you find the warmest air: a. in the corners b.by a window c. near the ceiling d. near the floor

Answer 2

c. near the ceiling

Question 3

by what process does heat energy travel from the sun to the earth: a. heat is radiated through space b. heat is conducted through air molecules c. convection of heat through the air currents d. heat travels through the wind

Answer 3

a. heat is radiated through space

Question 4

why are metals good conductors of heat: a they bend easily b. they can melt at low temperatures c. their molecules are closely packed d. they have pockets of air in them

Answer 4

c. their molecules are closely packed.

Question 5

how is heat created

Answer 5

heat is created by moving molecules when the molecules in a substance move faster the substance has more heat energy.

Question 6

what is conduction

Answer 6

heat transfer by touch is called conduction. when heat is transfered in solids it is through conduction

Question 7

what is radiation

Answer 7

heat transfered by electromagnetic waves is called radiation. Radiation can travel through empty space

Question 8

what is convection

Answer 8

convection is heat transfer in liquids, and gasses. hot water or air rises and cold water or air sinks. this happens because hot air is less dense, and cold air is more dense.

Question 9

hot air balloon rising in the air

Answer 9

convection

Question 10

warming up by a fire

Answer 10

radiation

Question 11

getting a sunburn

Answer 11

radiation

Question 12

the furnace heating your house

Answer 12

convection

Question 13

a lizard warming itself on a hot rock

Answer 13

conduction

Question 14

scrambled eggs cooking on a frying pan

Answer 14

conduction

Question 15

stepping on cold tile floors in the bathroom

Answer 15

conduction

Question 16

snow melting on the side walk

Answer 16

radiation and conduction

Question 17

it is warmer upstairs in your house than in the basement

Answer 17

convection

Question 18

good conductors

Answer 18

brass copper metals

Question 19

insulators (bad conductors)

Answer 19

plastic, glass, wood

Question 20

when materials heat up they

Answer 20

expand

Question 21

light can travel through empty

Answer 21

space

Question 22

how loud or soft a sound is

Answer 22

volume

Question 23

block the transfer of heat

Answer 23

insulators

Question 24

sound waves with shortwave lengths have a high

Answer 24

frequency

Question 25

sound travels faster in _____ than in air

Answer 25

water

Question 26

light bending in a denser medium

Answer 26

refraction

Question 27

heat transfer by touch

Answer 27

conduction

Question 28

heat transfer by waves

Answer 28

radiation

Question 29

create sound

Answer 29

viberations

Question 30

sound must travel through a

Answer 30

medium

Question 31

heat travels from _____ objects to cooler objects

Answer 31

warmer

Question 32

hot air rises because it is less

Answer 32

dense

Question 33

transfers heat well

Answer 33

conductors

Question 34

how high or low a sound is

Answer 34

pitch

Question 35

light bouncing off an object

Answer 35

reflection

Question 36

heat transfer in air and water

Answer 36

convection

Question 37

a short vibrating object makes a _____ pitch

Answer 37

high