Wednesday, August 29, 2012

C.B.S.E.-2012-Sample-Papers-for-IX-Physics + Chemistry-Summative-Assessment-I

C.B.S.E.-2012-Sample-Papers-for-IX-Physics + Chemistry-Summative-Assessment-I

                                      Physics (Section A)
Give an example of situation: one object with a constant acceleration but with a zero velocity.          1-marks
Define Inertia  2-marks
A motor boat starting from rest on a lake accelerates in a straight line at a constant rate of 3m/s2 for 8s. How far does the boat travel during this time?   2-marks
Differentiate between distance and displacement.                       3-marks
Drive the equation for Newton’s second law of motion.              3-marks
A stone of 1 kg is thrown with a velocity of 20 m/s across the frozen surface of a lake comes to rest after travelling a distance of 50m. What is the force of friction between the stone and the ice?                                                                        4-marks
7. (a)
Plot a distance – time graph from the readings given below:      5-marks

X         Time (sec)          0          1          2          4          5          7

Y         Distance (m)      0          7          14        28        35        49
7. (b)
What can you say about the type of motion of the body?
7. (c)
What will be the distance covered in 8 seconds?
A bullet of mass 10 g traveling horizontally with a velocity of 150m/s strikes a stationery wooden block and comes to rest in 0.03 seconds. Calculate the distance of penetration of the bullet into the block. Also calculate the magnitude of the force exerted by the wooden block on the bullet.                                            5-marks
                                                            Section-B (chemistry)
Answer the following questions in one sentence:        4-marks

(a)Name the S.I. unit of temperature.

(b)Name the solvent like component of a colloid.

(c)Name the change of state directly from solid to gas without changing into liquid state.

(d)Name the process of separation of components of air.
Answer the following questions in two or three sentences each.  4-marks

1. Differentiate between the following:

a. Latent head of fusion & vaporization.     b. Solution & Colloids.
Give two examples each for the following                                     4 marks

a. Gel               b. Sol               c. Emulsion                             d. Foam
How does the water kept in an earthen pot become cool during summer?  3-marks
4. Mention any two applications of the following methods of separation.  3-marks

a. Chromatography      b. Crystallization c. Centrifugation
 (i) Define Velocity. Write its formula and units.                    3- marks

 (ii) Which require greater force: To accelerate an object of 2kg by 5m/sec2 or to accelerate an object of 4kg by 2m/s2. Find it.
Give reason for the following                                                  4-marks

a. On a hot sunny day, people sprinkle water on the open ground.

b. Water droplets are seen on the outer surface of a glass containing ice cold water.
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