Physics class ix notes 9th class board pattern model paper
Physics Chapter No-08 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
|
Normal human body temperature is:
|
150
|
370
|
370 F
|
98.60 C
|
2
|
The absolute zero is equal to:
|
00 C
|
2120 F
|
-2730 C
|
-3730 C
|
3
|
200 C is equal to:
|
253 K
|
263 K
|
283 K
|
293 K
|
4
|
The scale which is used for the
practice of scientific purpose is
|
Celsius scale
|
Fahrenheit scale
|
Kelvin scale
|
All of these
|
5
|
The SI unit of specific heat
capacity is:
|
Jkg
|
Jkg-1
|
Jkg-1k-1
|
Jk-1
|
6
|
The rate of evaporation is
affected by:
|
Temperature
|
Surface area
|
Wind
|
All of these
|
7
|
Wires on electric poles are given
some sag to prevent breaking
|
In summer
|
In winter
|
In day time
|
In rainy season
|
8
|
When we heat a bimetal strip, it:
|
Contracts
|
Expands
|
Bends
|
Straightens
|
9
|
At what temperature, when ice is
cooled, it contracts?
|
Below 00 C
|
Below 40 C
|
Above 40 C
|
None of these
|
10
|
The density of water is maximum
at:
|
1000 C
|
-40 C
|
40 C
|
00 C
|
Subjective
Answer the following short questions.
10×2=20
1. Normal
body temperature of human body is 98.60 F. Convert it into Celsius
scale and Kelvin scale.
2. What
is thermometer? Why mercury is preferred as a thermometric substance?
3. Define heat capacity and specific heat capacity.
3. Define heat capacity and specific heat capacity.
4. Define
latent heat of vaporization and how it is denoted?
5. A
brass rod is 1m long at 00 C. Find its length at 300
C.
(Coefficient of linear
expansion of brass= 1.9×10-5 K-1)
6. What
is bimetal strip and where it is used in our daily life?
7. How
does heating affect the motion of molecules of a gas?
8. Temperature
of water in a beaker is 500 C. What is its value in Fahrenheit
scale?
9. Define
the term heat and temperature.
10. Write
down some important applications of thermal expansion.
Long
Questions 5×1=5
1. (a)
What is meant by evaporation? On what factors the evaporation of a liquid
depends? Explain how cooling is produced by evaporation? 3
(b) How much heat is required to
increase the temperature of 0.5 kg of water from 100 C to 650
C? 2
Available all
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