Kerala SCERT Class 7 Science Chapter 9 Paths of Heat Flow Question Answer Solution Here. Kerala Board Class 7 Students can find Here 9th Chapter Paths of Heat Flow Notes provide by our Teacher. Important Question Answer from Chapter 9 Paths of Heat Flow.
- Board- Kerala Board.
- Class – 7.
- Subject – Science Part 2
- Chapter – 9.
- Chapter Name – Paths of Heat Flow.
- Topic – Question Answer Solution.
Multiple choice questions.
(1) Different modes of heat transfer is
a)conduction
b) convection
c) radiation
d) All the above.
(2) The substances that conduct heat very well are
a) good conductors
b) poor conductors
c) both
d) none.
(3) The substances that do not conduct heat very well are
a) good conductors
b) poor conductors
c) both
d)none.
(4) The process by which heat transfer takes place by the actual movement of molecules is
a) conduction
b) convection
c) radiation
d) none.
(5) The process of heat transmission without the help of a medium is
a) conduction
b) convection
c) radiation
d) none.
(6) the process of heat transfer from one end of a material to the other without the actual movementof the molecules is
a) conduction
b) convection
c) radiation
d) none.
(7) On heating, expand and On losing heat, contracts are
a) solids
b) liquids
c) gases
d) All the above.
(8) Working on the basis of the ability of liquids to expand and contract are
a) laboratory thermometer
b) clinical thermometer
c) both
d) none.
(9) Laboratory thermometer is used to measure temperatures
a) below 100
b) below 200
c) below 300
d) none.
Short questions and answers.
(1) What is heat transmission?
ANS: The flow of heat from one place to another is termed heat transmission.
(2) The handle of the pressure cooker and nonstick vessels are made of which substance?
ANS: Bakelite.
(3) How Food can be kept hot for a long time?
ANS: We can minimise heat transfer by conduction, convection and radiation.
(4)Which device we use for Food can be kept hot for a long time?
ANS: Thermo flask.
(5) Which substance used in thermometer?
ANS: Mercury.
6) What purpose Clinical thermometer is designed?
ANS: Clinical thermometer is designed to measure body temperature.
Short questions and answers.
(1) What is sea breeze?
ANS: i) During day time, land gets heated fast by the heat of the sun, while sea water gets heated slowly.
ii) The air above land gets heated and rises up. The less heated air from sea rushes to the land at this time.
iii) this is called sea breeze.
(2) What is land breeze?
ANS:
i) Land gets cooled faster at night and Sea gets cooled slowly.
ii) The air above sea will expand more than the air above land and rise up.
iii) The air above the land will blow to the sea. This is called land breeze.
(3) What are precautions When there is strong wind, rain and lightning?
ANS: precautions are given below:
i) Do not stand under tall and isolated trees.
ii) Take precaution foreseeing the chance of electric cables breaking and falling down.
iii) Do not stay inside weak buildings.
iv) If you happen to be in a lake, get to the shore immediately and take shelter in a safe place.