Your SlideShare is downloading. ×
Physics 2
Physics 2
Physics 2
Physics 2
Upcoming SlideShare
Loading in...5
×

Thanks for flagging this SlideShare!

Oops! An error has occurred.

×
Saving this for later? Get the SlideShare app to save on your phone or tablet. Read anywhere, anytime – even offline.
Text the download link to your phone
Standard text messaging rates apply

Physics 2

252

Published on

physics document

physics document

Published in: Education, Business, Technology
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
252
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
7
Comments
0
Likes
0
Embeds 0
No embeds

Report content
Flagged as inappropriate Flag as inappropriate
Flag as inappropriate

Select your reason for flagging this presentation as inappropriate.

Cancel
No notes for slide

Transcript

  • 1. PACA FOUNDATION CLASSES. All questions are compulsory. PART-A.Use appropriate answer.Q1-In a solid, heat is transferred mainly by the process of: (a) Conduction (b)convection (b) Radiation (d)noneQ2-A good conductor of heat is:(a) wood (b)asbestos(c) air (d) mercuryQ3-In a liquid, heat is transferred mainly by:(a)conduction (b)convection(c) radiation (d)noneQ4-in convection, heat is transferred:(a) upwards (b)downwards(c) sideways (d)in all directions.Q5-In vacuum heat is transferred by:(a)conduction (b) convection(c) radiation (d)none.Q6-The fastest mode of transfer of heat:
  • 2. (a)Radiation (b)convection(c) conduction (d)none.Q7-Heat loss from surface by radiation can be reduced by:(a) keeping it in dark.(b) blackening the surface.(c) polishing the surface.(d)keeping the surface in vacuum.Q8-In a thermos flask, the vacuum between its walls reduce the heat loss by:(a)conduction (b)convection(c)radiation (d)conduction, convection both. PART-BQ1. Name the different modes of the transfer of heat.Q2. What is good bad conductor of heat? Give two example of each.Q3.Arraange the following in order of their increasing heat conductivity:copper,air, water, mercury.Q4. Explain the process of conduction in solid.Q5.How does the process of conduction differ in metals and non metal. PART-CQ1-Name a metal which is a good conductor of heat.Q2-Name a substance which is a good insulator of heat.
  • 3. Q3- Give the list of some common substance in order of their decreasingconductivity of heat.Q4-In winter, a piece of iron on being touched by hand appears colder than apiece of wood. Give reason.Q5- when a metallic wire gauze is brought over the frame of a burner,the flamedoes not pass through the wire mesh. Give reason.Q6-Explain briefly the process of heat transfer by convection.Q7-In a solid ,heat is not transferred by the process of convection.Give reason.Q8-It is possible to heat a liquid or gas? Explain in your words.Q9-Why is a room heater in a room installed near the floor of the room.Q10-By the process convection ,heat is always transferred vertically upwards.Givereason.Q11-the inside of a closed car parked In the son is much warmer.Explain.Q12-On opening the windows of a glass walled room, the insight temperaturefalls. Explain.Q13- A red hot iron wall a suspended from the celling of a room by a thin metallicwire.(a)Name the ways In which the ball losses heat.(b)Name the way by which it losses the heat least, given a reason for your answer.(c)Explain what role the air in the room plays in the loss of heat.Q14-Name the three process of the heat transfer and distinguish between them.Q15-What is green house effect ,name three green house gases.Q16-what is ecosystem.Q17-Draw carbon cycle.

×