Physics class ix notes 9th class board pattern model paper
Physics Chapter No-09 Important questions, if you attempt these question you will get InshaAllah 100% marks.
Objective
Part
Choose the right option.
10×1=10
A
|
B
|
C
|
D
|
||
1
|
Rooms are heated using gas
heaters by:
|
Conduction only
|
Convection and
radiation
|
Radiation only
|
Convection only
|
2
|
Which of the following is a good
radiator of heat?
|
A shining silvered
surface
|
Dull black surface
|
White surface
|
Green coloured
surface
|
3
|
Which of the following is bad
conductor of heat?
|
Wood
|
Rubber
|
Cotton
|
All of these
|
4
|
The SI unit of thermal
conductivity is:
|
Wm-1k-1
|
Wm-1k
|
Js-1k-1
|
Js-1m-1
|
5
|
All metals are:
|
Good conductor of
heat
|
Poor conductor
|
Bad conductor of heat
|
None of these
|
6
|
Land breeze and sea breeze are
the result of:
|
Conduction
|
Convection
|
Radiation
|
Both (b) and (c)
|
7
|
Gliders use upward movement of
hot air currents due to:
|
Conduction
|
Convection
|
Radiation
|
Thermals
|
8
|
Which type of thermal radiation
can easily pass through polythene sheets?
|
Infrared
|
Ultraviolet
|
Both (a) and (b)
|
None of these
|
9
|
In green house effect, which of
the following behaves like polythene sheet?
|
Oxygen
|
Ozone
|
Carbon dioxide
|
Hydrogen
|
10
|
Earth’s atmosphere contains:
|
Carbon dioxide
|
Water vapours
|
Both (a) and (b)
|
None of these
|
Subjective
Answer
the following questions. 10×2=20
1. Why
a metal feels colder to touch then wood kept in a cold place?
2. Define
convection and write down some uses of convection current.
3. What
measures do you suggest to conserve energy in houses?
4. Why
does sea breeze blow during the day?
5. What
is radiation? How does heat reach us from the sun?
6. What
is Leslie cube? Describe its structure and working?
7. Why
does a cup of hot tea become colder after sometime?
8. Why
does transfer of heat in fluids take place by convection?
9. How
temperature in thermos flask is maintained for a long time?
10. What
causes a glider to remain in air?
Long Question 5×1=5
1. (a)
What is green house effect? Explain the impact of green house effect in global
warming.
(b) The concrete roof of a house of
thickness 20cm has an area 200m2. The temperature inside the house
is 150 C and outside is 350 C. Find the rate at which
thermal energy will be conducted through the roof. The value of K for concrete
is 0.65Wm-1K-1. 2.5
Metric Physics ix notes chapter wise:
FBISE Islamabad Matric Computer Science Class ix notes, Class 9th notes.
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