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Class 9 Physics Transfer of Heat


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Class 9Class 10First YearSecond Year
vii.Roomsareheatedusinggasheatersby(a)Conductiononly(b)Convectionandradiation(c)Radiationonly(d)Convectiononlyvii. Rooms are heated using gas heaters by(a) Conduction only(b) Convection and radiation(c) Radiation only(d) Convection only

b) The energy of 600 \mathrm{~J} dissipated by a bulb in 50 minutes. Find the power of the bulb.
b) The energy of  600 \mathrm{~J}  dissipated by a bulb in 50 minutes. Find the power of the bulb.

b)Theenergyof600 Jdissipatedbyabulbin50minutes.Findthepowerofthebulb.b) The energy of 600 \mathrm{~J} dissipated by a bulb in 50 minutes. Find the power of the bulb.

4. A body of mass 1 \mathrm{~kg} is lifted through a height of 1 \mathrm{~m} . The energy possessed in the body will be (consider g=10 \mathrm{~ms}^{-2} )a) 1 \mathrm{~J} b) 10 Joulec) 100 Jouled) 1000 Joule
4. A body of mass  1 \mathrm{~kg}  is lifted through a height of  1 \mathrm{~m} . The energy possessed in the body will be (consider  g=10 \mathrm{~ms}^{-2}  )a)  1 \mathrm{~J} b) 10 Joulec) 100 Jouled) 1000 Joule

4.Abodyofmass1 kgisliftedthroughaheightof1 m.Theenergypossessedinthebodywillbe(considerg=10 ms2)a)1 Jb)10Joulec)100Jouled)1000Joule4. A body of mass 1 \mathrm{~kg} is lifted through a height of 1 \mathrm{~m} . The energy possessed in the body will be (consider g=10 \mathrm{~ms}^{-2} )a) 1 \mathrm{~J} b) 10 Joulec) 100 Jouled) 1000 Joule

10. Write notes on Tidal energy and Geothermal energy.
10. Write notes on Tidal energy and Geothermal energy.

10.WritenotesonTidalenergyandGeothermalenergy.10. Write notes on Tidal energy and Geothermal energy.

9.6 Why transfer of heat in fluids takes place by convection?
 9.6 Why transfer of heat in fluids takes place by convection?

9.6Whytransferofheatinfluidstakesplacebyconvection? 9.6 Why transfer of heat in fluids takes place by convection?

9.2 Why metals are good conductors of heat?
9.2 Why metals are good conductors of heat?

9.2Whymetalsaregoodconductorsofheat?9.2 Why metals are good conductors of heat?

9.3 Explain why:(a) a metal feels colder to touch than wood kept in a cold place?
9.3 Explain why:(a) a metal feels colder to touch than wood kept in a cold place?

9.3Explainwhy:(a)ametalfeelscoldertotouchthanwoodkeptinacoldplace?9.3 Explain why:(a) a metal feels colder to touch than wood kept in a cold place?

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