CBSE Board Class 9 Science Sample Papers 2007

Sample Paper – 2007
Class – IX
Subject – Science 


1.How much force acts on a body whose momentum is constant (i.e. P = constant)? 

2.Name the principle behind the working of a rocket.                                                   

3.State: Newton’s second law of motion.                                                                       

4.A ball is moving over a horizontal smooth surface with a constant velocity. What types of forces are acting on the ball?                                                                                                        

5.Why is it advised to tie any luggage kept on the roof of a bus with a rope?                             

6.A force of 10N acts on masses m1 and m2 to accelerate them by 2m/s2 and 4m/s2. If they are tied together, find the acceleration.                         

7.A bullet fired from a gun makes a fine hole in the window pane, while a stone smashes the window pane into pieces. Explain why?                                                                   

8.The V-T graph of a coin moving on a table is given in figure. If the coin is 10g, how much force the table exert on coin to bring it to rest?                                                                                          

9.Derive the law of conservation of momentum. m1u1 + m2u2 = m1v1 + m2v2      
Two objects of masses 100 g and 200 g are moving in along the same line and direction with velocities of 2 ms-1 and 1 ms-1, respectively. They collide and after the collision, the first object moves at a velocity of 1.67 ms-1. Determine the velocity of the second object?

10.Which gas form the liquid first as the components of air cooled?                               

11.Define Tyndall effect.                                                                                                       

12.Define dispersion phase and dispersion medium with example.                               

13.Name the process used for obtaining pure Copper sulphate from an impure sample.     

14.How would you prepare 500g of aqueous solution containing 15% mass by mass of sucrose? 

15.Classify each of the following as a homogeneous or heterogeneous mixture:       
       a. Soda water     b. wood     c. air     d. vinegar     
                            
16.Give two points of difference between compounds and mixtures.        

17.Give a flow diagram showing the process of obtaining different gaseous components of air. 

18.Explain how mixtures are classified on the basis of their physical properties.        

19.Action and reaction are equal and opposite. Why they can’t cancel each other?    

20.Find out the linear momentum of a cricket ball of mass 250g moving with a velocity of 72km/h.  

21.An astronaut in open space is away form his space ship. How can he return to his ship?  

22.Is the relation, applicable to the motion of a rocket?   

23.How much force acts on a body whose momentum is constant. (i.e. = constant)

24.Explain, why a gun recoils after firing a bullet?    

25.If action is always equal to the reaction, explain how a horse can pull a cart?