Physics 9th Class Model Papers

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X X X Define find motion force Part write mathematical form question thermal expansion Derive
(I)





 2012-13












12 

Paper Code  ----
 15






	



	












	






D 
	

 C , B , A


	




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Note:-  You have four choices for each objective type question as A, B, C and D.  The choice which you think is correct; fill 
that circle in front of that question number.  Use marker or pen to fill the circles. Cutting or filling two or more circles 
will result in zero mark in that question.
( D )
( C )
( B )
( A )
QUESTIONS
Q. 1


Four

Three


Two
One
The number of        

	






	
210.0g
 significant figures in 210.0 g are
1




Rotatory
motion

	



Vibratory
motion


Circular
motion


Random
motion



	
	



 	



The spinning motion of a body around its
own axis is called
2
One Newton(N) is equal to       
3
Rate of change        





 	









of momentum can be written as
4
F=
F=
F=
F=







F







The magnitude of Resultant force (F) is given by
5
N m
-1
 Kg
-2
N m Kg
-1


	



S.I
The S.I unit of gravitational constant is             
6
Vo=






 	

	






 
	





h 

Formula for orbital velocity of satellite at
height h is
7





 	


Momentum


Torque


Power

Energy








Rate of doing work is called
8
One pascal is equal to             
9
Pga

	






Up thrust of liquid is given by
10
	



	


 	







 	



	


 	



	

	






 	








The relation between coefficient of volume
 expansion
 and linear expansion 
is  
11
Temperature

Time


Length

Area
Rate of flow        

	










of heat is inversely proportional to
12
(I)





 2012-13











63 

 2:45

Part ------------------------------- I
z
X
X
X
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X
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X
X
X
X
X
X
X
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X
Zz
w
2. Answer any SIX parts from the followings:-             (12)                    
ZÆ
™
,
X
Š
g
`
fs
~
Ð
Ã
ðÐ
X2
Define base and derived quantities.                                                                              

	



	









(i)
Describe scientific notation? Give an example.                                                  







	
	






	






(ii)
Differentiate between physical balance and electronic balance.              

	


	






	



(iii)
Differentiate between circular motion and rotatory motion.                            


	












	



(iv)
Define scalars and vectors.                                                                                               


	






(v)
Differentiate between distance and displacement.                                                      

	





 

!


 		




	



(vi)
 Define limiting friction and write its mathematical form.                               
	






	


	






(vii)

	





	


















 r 
 


	




m 



For a body of mass "m" moving in a circle of radius "r". If its velocity is doubled, what will be the effect on value
of centripetal force.
(viii)
	

	



	


	


2








Calculate the value of force acting on a body of mass 2 kg and    produces an acceleration of 2 ms-2 in it.
(ix) 
  3. Answer any FIVE parts from the followings:-              (10)               
Š
g̀
fs
~
Ð
Ã
ð
ZÆ
™
,
X
X 3


	






	

	






	
X - axis

 F



A force "F" is acting on  a body at an angle
 with x-axis. Write the magnitude of horizontal and                 
vertical components of the force.
(i)
On doubling the moment arm, find its effect on the value of torque.          












(ii)
Define law of gravitation and write its mathematical form.                     


	






	


	





(iii)
Why are communication satellites stationed at geostationary orbits?  



"




		


 	











(iv)
Why is the value of "g" different at different places?                                          













g 

(v)
Define work and write its S.I unit.                                                                            

SI






	


	


(vi)
Write the names of any four forms of Energy.                                                           







	




(vii)
A machine does 4 Joule of work in 2, calculate its power.           








	






4 

2
(viii)
 4. Answer any FIVE parts from the followings:-          (10)                  
Šg
`
fs
~
Ð
Ã
ð
ZÆ
™
,
X
X4
On what factors pressure of a liquid depends?                                                               


	

	
	


(i)



	















Define principle of floatation. Why a wooden block floats on surface of water?
(ii)
Write any two uses of thermal expansion in our daily life.                             




	




	




(iii)
On what factors  evaporation of liquid depends                                                        



	

	

	
	

(iv)




	









	


 Calculate the value of latent heat of fusion of 4 kg of ice at
(v)
Define rate of flow of heat and write its mathematical form.           

	













	

	





(vi)
Differentiate between land and sea breezes.                                                               

	










(vii)
Why is it not advisable to wear dark colour clothes in summer











	




season?.
(viii)
- - ( 2 )- - 
Part ------------------------------- II
z
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Š
z
x
Note: Attempt any Three questions.  
 7x3=21      
 
&
Î
ZÑ]
Æ
™
,
X
Ã
ðÐ
â^
X
4
 
 


	








	
	







5
       3
  








	










5.  (a)  Derive Second Equation of Motion with the help of Graph.                                          4               
      (b)    Find the mass of a small stone by a Physical Balance.                                                                        3
 
1+3


	






 	






	


	







6
 
3    



	








4.4N
	

 3.8N 





	


















6.     (a)  Define Centripetal force & Derive its formula.                                                            1+3           
(b)   A Picture frame is hanging by two vertical strings. The tension in the strings are 3.8 N & 4.4N. Find the weight of
the picture frame.                                                                                                                              3
   1+3    
  
KE=1/2mv
2


	


	







	


7
3
 







	






 
	




850







 	


7.  (a)  Define kinetic energy and prove that K.E.=1/2mv
2
.                                                               1+3
     (b)   A Polar satellite is launched at 850 km above Earth. Find its Orbital Speed.                            3
 
1+3


	





	










8


	





2.55gcm-3


	


	





	









!

# 	



306g










5



3

	




 8.  (a)  Define Pressure. Derive an expression for the pressure in liquids.                                             1+3
(b)   A cube of glass of 5cm side and mass 306g has a Cavity inside it. If the density of glass is 2.55gcm -3. Find    
             the volume of the cavity.                                                                                                                3
      1+3


	



	





	



	





	





	




9

	




1mm




	




10,000 N

	

	


1



 3     


$
 	


%









9.  (a)  Define thermal expansion and derive an expression for linear thermal expansion in solids.      1+3
(b)  A steel wire 1 m long has cross sectional area
 is stretched through 1mm by a force of 10000 N.       
      Find the Young's modulus of the wire.                                                                                                    3
Part ------------------------------- III
(Practical Part)
z
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
XÎ
x
Attempt any two Questions                          
5x2=10




	






5 




"W1" 
	


	










	








	




	



50cm

	

10
10.  A meter rod is balanced at 50 cm. Weights are suspended as shown in the fig. Find unknown weight (W1) 
by using principle of moments.                                                                                                                5








	


&
'


 	
	

0.02cm

	

	
%
	



	



X11
5





11- Differentiate between positive and negative zero error. Apply zero correction on a cylinder of diameter 0.81 cm      
measured by a vernier callipers having positive zero error 0.02 cm. Find corrected dimater of cylinder
5
5
	










	







 








12
12-   Draw a graph between time & temperature when ice is converted into steam by slow heating with the help of
following  table.                                                                                                      5
time (min)
0
2
4
6
8
10
12
14
16
18
20
22
24
26
Temp(C0) -30
-20
0
0
0
20
40
60
80
100
100
100
100
120