Gujarat Board Class 9 Science Sample Papers 2007

Sample paper 
Science
Class – IX

1.State Newton’s second law of motion.                       

2.The normal human body  temperature  is 37°C. what is the temperature on  the  Kelvin scale?                        

3 How much momentum will a dumb-bell of mass 10 kg transfer to the floor  if it falls from a height of 0.8m( g = 10m/s2 ).               

4. what kind of energy transformation takes place in the following?                        
   a) photoelectric cell              b) electric motor
   c)dry cell                                d) nuclear reactor.

5. How much heat must be added to raise the temperature of 100 gm water from 5° to 95 °? ( sp heat of water is 4.8 J/kg °C).                                    

6. Derive the expression s=ut+ ½at2 graphically 

7.  What will be the value of ‘g’ and ‘G’ at the center of the earth and at the poles.         

8. A ball is thrown up with a speed of 0.5m/s. How high will it go before it begins to fall? Calculate the time taken to reach the topmost point ( g = 10m/s2 ).

9.Define power? What is its S.I unit.                         

10. A bag weighs 200kgs.to what height should it be raised  so that its P.E may be 9800J ( g = 9.8m/s2 ).

11.  Derivethe expression K.E=½mc2                              

12. A bullet is fired from a gun . which will have greater kinetic energy, the bullet or  the gun? Give reason.

13. How do differentiate between center of gravity  and center of mass.                                

14.The acceleration due to the gravity at the moon ‘s surface is 1.67m/s2 . If thr radius of the moon is 1.74x106 m .calculate the mass of the moon.(G=6.67x10-11Nm2/kg2).

15.An atom ‘A’ has the mass number 40 and atomic no: 18.  An atom ‘B’ has the mass number 40 and atomic no: 20. Are the  atom ‘A’ and ‘B’ isotope of same element.Which amongst ‘A ’ and ‘B’ is a metal

16.2Ag+ + Cu ?> Cu2++ Ag . In the above redox reaction name 1) the substance which    is oxidized  2) the substance which is an oxidizing agent.

17.Explain the formation of the following ionic compounds and represent them by dot diagram and also write ionic equation a) sodium oxide b) magnesium chloride.
[ Na= 11 , Mg= 12, O=8,Cl =17].

18 What type of bond is present in CaCl2  and Cl2